Comtech EF Data is an AS9100 Rev B / ISO9001:2000 Registered Company DMD20/DMD20LBST Universal Satellite Modem Installation and Operation Manual IMPORTANT NOTE: The information contained in this document supersedes all previously published information regarding this product. This manual is subject to change without prior notice.
Errata A for MN-DMD20-20LBST Rev 14 Comtech EF Data Documentation Update Subject: Errata Part Number: PLM CO Number: Comments: ER-DMD20LBS-EA14 Chapter 7, Technical Specifications ER-DMD20LBS-EA14 (Errata documents are not subject to revision.) C-0026230 See attached page(s). The new information will be included in the next released revision of the manual.
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Chapter 7. TECHNICAL SPECIFICATIONS 7.1 Data Rates Refer to Section 7.18. 7.
DMD20/20LBST Universal Satellite Modem Technical Specifications LDPC/TPC (Optional) LDPC (BPSK) LDPC (OQPSK/QPSK) LDPC (8PSK/8QAM) LDPC (16QAM) Turbo (BPSK) Turbo (QPSK/OQPSK) Turbo (8QAM/8PSK) Turbo (16QAM) Outer Encoder Options {21/44} {1/2, 2/3, 3/4, 7/8} {2/3, 3/4, 7/8} {3/4, 7/8} Reed-Solomon INTELSAT (DVB Optional, Custom Rates Optional) Internal, External, Rx Recovered -6 -8 1 x 10 Typical (Optional to 5 x 10 ) DMD20 -8 5 x 10 Typical DMD20 LBST Data Clock Source Internal Stability 7.
DMD20/20LBST Universal Satellite Modem Decoder Options Reed-Solomon INTELSAT (DVB Optional, Custom Rates Optional) CCITT V.35 or IBS (Others Optional) Programmable ±1 kHz to ± 255 kHz 100 msec to 6000 sec. in 100 msec Steps Descrambler Acquisition Range Sweep Delay Value 7.4 Plesiochronous Buffer Size Centering Centering Modes Clock 7.
DMD20/20LBST Universal Satellite Modem Technical Specifications 7.10 High-Speed Serial Interface (HSSI) HSSI: HSSI, Serial, 50-Pin SCSI-2 Type Connector (Female) 7.11 ASI ASI/RS-422 Parallel: ASI, Serial, 75-Ohm BNC (Female) DVB/M2P, Parallel, RS-422, DB-25 (Female) ASI/LVDS Parallel: ASI, Serial, 75-Ohm BNC (Female) DVB/M2P, Parallel, LVDS, DB-25 (Female) 7.12 DVB/M2P DVB/M2P: DB-25 Female Connector. It complies with RS-422 Electrical Specifications. 7.
DMD20/20LBST Universal Satellite Modem Technical Specifications 7.17 Environmental Prime Power Operating Temperature Storage Temperature 100 to 240 VAC, 50 to 60 Hz, 40 Watts Maximum 48 VDC (Optional) 0 to 50°C, 95% Humidity, Non-Condensing -20 to 70°C, 99% humidity, Non-Condensing 7.18 Physical Size Weight DMD20 DMD20 LBST 19” W x 16” D x 1.75” H (48.26 x 40.64 x 4.45 cm) 6.5 Pounds (3.0 Kg) 19” W x 19.25” D x 1.75” H (48.26 x 48.89 x 4.45 cm) 8.5 pounds (3.83 kg) 7.
DMD20/20LBST Universal Satellite Modem Technical Specifications Modulation Code Rate Min Data Rate Max Data Rate QPSK SEQ 7/8 8400 2048000 QPSK TPC 1/2 4582 9545454 Supercard QPSK TPC 3/4 7200 15000000 Supercard QPSK TPC 7/8 8400 17500000 Supercard QPSK TPC .495 4752 6312000 Supercard QPSK TPC .
DMD20/20LBST Universal Satellite Modem Technical Specifications Modulation Code Rate Min Data Rate Max Data Rate Option Card 8PSK/8QAM LDPC 3/4 40500 20000000 LDPC/TPC Card 8PSK TPC 3/4 40000 20000000 LDPC/TPC Card 8PSK TPC 7/8 48000 20000000 LDPC/TPC Card 16QAM VIT 3/4 14400 20000000 16QAM VIT 7/8 16840 20000000 16QAM TPC 3/4 1440 20000000 Supercard 16QAM TPC 7/8 16800 20000000 Supercard 16QAM TPC .495 9504 6312000 Supercard 16QAM TPC .
DMD20/20LBST Universal Satellite Modem Technical Specifications 188 Mode Modulation Code Rate Min Data Rate Max Data Rate BPSK VIT 1/2 2400 4607843 BPSK VIT 2/3 2950 6143790 BPSK VIT 3/4 3318 6911764 BPSK VIT 5/6 3687 7679738 BPSK VIT 7/8 3871 8063725 QPSK VIT 1/2 4424 9215686 QPSK VIT 2/3 5899 12287581 QPSK VIT 3/4 6636 13823529 QPSK VIT 5/6 7373 15359477 QPSK VIT 7/8 7742 16127450 8PSK TRE 2/3 8848 18431372 8PSK TRE 5/6 11059 20000000 8PSK TRE 8/9 11
DMD20/20LBST Universal Satellite Modem Technical Specifications 7.20 BER Specifications 7.20.1 BER Performance (Viterbi) 1E-1 B/O/QPSK Uncoded Theory 1E-2 Viterbi Decoder 1E-3 Typical Performance BER 1E-4 1E-5 1E-6 Specification 1/2 Rate Specification 3/4 Rate 1E-7 Specification 7/8 Rate 1E-8 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 Eb/No in dB Figure 7-1 DMD20/20LBST B/O/QPSK BER Performance (Viterbi) Note: Eb/No values include the effect of using Differential Decoding and V.
DMD20/20LBST Universal Satellite Modem 7.20.2 Technical Specifications BER Performance (Sequential) 1E-1 B/O/QPSK Uncoded Theory 1E-2 Sequential Decoder Typical Performance 1E-3 BER 1E-4 1E-5 1E-6 Specification 1/2 Rate 1E-7 Specification 3/4 Rate 1E-8 1E-9 Specification 7/8 Rate 0 1 2 3 4 5 6 7 8 9 10 11 12 Eb/No in dB Figure 7-2 DMD20/20LBST B/O/QPSK BER Performance (Sequential) Note: Eb/No values include the effect of using Differential Decoding and V.35 descrambling.
DMD20/20LBST Universal Satellite Modem 7.20.3 Technical Specifications BER Performance (Viterbi with Reed-Solomon) 1E-1 B/O/QPSK Uncoded Theory 1E-2 Typical Performance Viterbi Decoder Reed Solomon 1E-3 BER 1E-4 1E-5 1E-6 Specification 1/2 Rate 1E-7 Specification 7/8 Rate Specification 3/4 Rate 1E-8 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 Eb/No in dB Figure 7-3 DMD20/20LBST B/O/QPSK BER Performance (Viterbi w/R-S) Note: Eb/No values include the effect of using Differential Decoding.
DMD20/20LBST Universal Satellite Modem 7.20.4 Technical Specifications BER Performance (Turbo) 1E-1 B/O/QPSK Uncoded Theory 1E-2 Turbo Decoder Typical Performance 1E-3 BER 1E-4 1E-5 1E-6 1E-7 Specification Turbo 0.495 1E-8 1E-9 Specification Turbo 0.
DMD20/20LBST Universal Satellite Modem 7.20.5 Technical Specifications BER Performance (8PSK Trellis) 1E-1 8PSK Uncoded Theory Trellis Decoder 1E-2 1E-3 Typical Performance BER 1E-4 1E-5 1E-6 Specification 2/3 Rate 1E-7 Specification 2/3 Rate w/RS 1E-8 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 Eb/No in dB Figure 7-5 DMD20/20LBST 8PSK BER Performance (Trellis) Note: Eb/No values include the effect of using interleaving and maximum iterations.
DMD20/20LBST Universal Satellite Modem 7.20.6 Technical Specifications BER Performance (8PSK Turbo) 1E-1 8PSK Uncoded Theory 1E-2 Turbo Decoder Typical Performance 1E-3 BER 1E-4 1E-5 1E-6 1E-7 1E-8 Specification Turbo 0.
DMD20/20LBST Universal Satellite Modem 7.20.7 Technical Specifications BER Performance (16QAM Viterbi) 1E-1 16QAM Uncoded Theory Viterbi Decoder 1E-2 1E-3 Typical Performance BER 1E-4 1E-5 1E-6 Specification 3/4 Rate 1E-7 Specification 7/8 Rate 1E-8 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Eb/No in dB Figure 7-7 DMD20/20LBST 16QAM BER Performance (Viterbi) Note: Eb/No values include the effect of using Differential Decoding and V.35 Descrambling.
DMD20/20LBST Universal Satellite Modem 7.20.8 Technical Specifications BER Performance (16QAM Viterbi with Reed-Solomon) 1E-1 16QAM Uncoded Theory 1E-2 Viterbi Decoder Reed Solomon Typical Performance 1E-3 BER 1E-4 1E-5 1E-6 Specification 3/4 Rate w/RS 1E-7 Specification 7/8 Rate w/RS 1E-8 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Eb/No in dB Figure 7-8 DMD20/20LBST 16QAM BER Performance (Viterbi w/R-S) Note: Eb/No values include the effect of using Differential Decoding.
DMD20/20LBST Universal Satellite Modem 7.20.9 Technical Specifications BER Performance (16QAM Turbo) 1E-1 16QAM Uncoded Theory 1E-2 Turbo Decoder Typical Performance 1E-3 BER 1E-4 1E-5 1E-6 Turbo 0.495 1E-7 Turbo 0.793 1E-8 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Eb/No in dB Figure 7-9 DMD20/20LBST 16QAM BER Performance (Turbo) Note: Eb/No values include the effect of using interleaving and maximum iterations.
DMD20/20LBST Universal Satellite Modem 7.20.
DMD20/20LBST Universal Satellite Modem 7.20.11 Technical Specifications BER Performance (BPSK Turbo) 1E-1 B/O/QPSK Uncoded Theory 1E-2 Turbo Decoder 1E-3 BER 1E-4 Specification 21/44 Rate 1E-5 Specification 5/16 Rate 1E-6 1E-7 Typical Performance 1E-8 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 Eb/No in dB Figure 7-11 DMD20/20LBST BPSK BER Performance (Turbo) Note: BPSK TPC 5/16 available with PL/5051 Turbo Codec Hardware.
DMD20/20LBST Universal Satellite Modem 7.20.
DMD20/20LBST Universal Satellite Modem 7.20.
DMD20/20LBST Universal Satellite Modem 7.20.
DMD20/20LBST Universal Satellite Modem 7.20.
DMD20/20LBST Universal Satellite Modem 7.20.
DMD20/20LBST Universal Satellite Modem BER 1E-3 1E-4 1E-5 1E-6 1E-7 1E-8 1E-9 1E-10 Table 7-1 - B/O/QPSK BER Performance (Viterbi) Specification Typical 1/2 Rate 3/4 Rate 7/8 Rate 1/2 Rate 3/4 Rate 4.2 dB 5.3 dB 6.2 dB 3.9 dB 4.9 dB 4.8 dB 6.1 dB 7.1 dB 4.5 dB 5.6 dB 5.5 dB 6.8 dB 7.9 dB 5.1 dB 6.3 dB 6.1 dB 7.6 dB 8.6 dB 5.7 dB 7 dB 6.7 dB 8.3 dB 9.3 dB 6.2 dB 7.7 dB 7.4 dB 8.9 dB 10.2 dB 6.8 dB 8.4 dB 8.2 dB 9.7 dB 11 dB 7.4 dB 9.1 dB 9 dB 10.3 dB 11.7 dB 8.1 dB 9.
DMD20/20LBST Universal Satellite Modem BER 1E-3 1E-4 1E-5 1E-6 1E-7 1E-8 1E-9 1E-10 Technical Specifications Table 7-5 - 8PSK BER Performance (Trellis) Specification Typical 2/3 Rate 2/3 Rate w/RS 2/3 Rate 2/3 Rate w/RS 6.3 dB 5.8 dB 4.8 dB 4.9 dB 7.3 dB 6.1 dB 5.6 dB 5.1 dB 8.2 dB 6.3 dB 6.4 dB 5.4 dB 9 dB 6.5 dB 7.2 dB 5.6 dB 9.8 dB 6.7 dB 8.1 dB 5.8 dB 10.4 dB 6.9 dB 8.9 dB 6.1 dB 11.1 dB 7.1 dB 9.7 dB 6.3 dB 11.9 dB 7.3 dB 10.5 dB 6.
DMD20/20LBST Universal Satellite Modem BER 1E-3 1E-4 1E-5 1E-6 1E-7 1E-8 1E-9 1E-10 BER 1E-3 1E-4 1E-5 1E-6 1E-7 1E-8 Technical Specifications Table 7-9 - 16QAM BER Performance (Turbo) Typical Specification Turbo 0.495 Turbo 0.793 Turbo 0.495 Turbo 0.793 5.6 dB 7 dB 6.1 dB 7.4 dB 6.6 dB 7.8 dB 7 dB 8.2 dB 7.5 dB 8.6 dB 8 dB 9 dB 8.5 dB 9.4 dB 9 dB 9.9 dB Table 7-10 - (O)QPSK BER Performance (Turbo) Specification Typical 1/2 Rate 3/4 Rate 7/8 Rate 1/2 Rate 3/4 Rate 3.2 dB 4 dB 2.8 dB 3.4 dB 4.
DMD20/20LBST Universal Satellite Modem Technical Specifications Table 7-13 - 16QAM BER Performance (Turbo) BER Specification Typical 3/4 Rate 7/8 Rate 3/4 Rate 7/8 Rate 1E-3 6.3 dB 7.8 dB 6 dB 7.4 dB 1E-4 6.7 dB 7.9 dB 6.4 dB 7.5 dB 1E-5 7 dB 8 dB 6.7 dB 7.6 dB 1E-6 7.4 dB 8.1 dB 7.1 dB 7.7 dB 1E-7 7.8 dB 8.2 dB 7.5 dB 7.8 dB 1E-8 8.2 dB 8.3 dB 7.9 dB 7.9 dB Table 7-13 - 16QAM BER Performance (Turbo) BER Specification Typical 3/4 Rate 7/8 Rate 3/4 Rate 7/8 Rate 1E-3 6.3 dB 7.8 dB 6 dB 7.4 dB 1E-4 6.
DMD20/20LBST Universal Satellite Modem 7.20.17 Technical Specifications AGC Output Voltage The AGC Output Voltage is a function of the Input Power Level in dBm. The AGC Output Voltage is found on the Alarm connector Pin 14 of J15.
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Errata B for MN-DMD20-20LBST Rev 14 Comtech EF Data Documentation Update Subject: Errata Part Number: PLM CO Number: Comments: Chapter 3, Theory of Operation ER-DMD20LBS-EB14 (Errata documents are not subject to revision.) C-0028800 The new information will be included in the next released revision of the manual.
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Comtech EF Data is an AS9100 Rev B / ISO9001:2000 Registered Company DMD20/DMD20LBST Universal Satellite Modem Installation and Operation Manual Part Number MN-DMD20-20LBST Revision 14 Copyright © 2013 Comtech EF Data. All rights reserved. Printed in the USA. Comtech EF Data, 2114 West 7th Street, Tempe, Arizona 85281 USA, 480.333.2200, FAX: 480.333.
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Table of Contents CHAPTER 1. 1.1 INTRODUCTION ..................................................................................1–1 Overview ................................................................................................................................ 1–1 1.2 Configurations ....................................................................................................................... 1–2 1.2.1 Features/Options Installed at Time of Order...........................................
Table of ContentsTable of Contents DMD20/DMD20LBST Universal Satellite Modem 3.3.4 Revision 14 MN-DMD20-20LBST Modem Monitor Status ..................................................................................................... 3–7 3.4 Async Port / ES-ES Communications.................................................................................... 3–7 3.5 Internal Clock ........................................................................................................................
Table of ContentsTable of Contents DMD20/DMD20LBST Universal Satellite Modem Revision 14 MN-DMD20-20LBST 3.15.4 System Functionality and Operational Considerations..................................................... 3–29 3.15.5 DoubleTalk Carrier-in-Carrier Cancellation Process ....................................................... 3–31 3.15.6 Margin Requirements ..................................................................................................... 3–33 3.15.7 Carrier-in-Carrier Latency .
Table of ContentsTable of Contents DMD20/DMD20LBST Universal Satellite Modem 4.5.2 Revision 14 MN-DMD20-20LBST Modem Setup for Terminal Mode ................................................................................... 4–47 4.6 Terminal Port User Interface .............................................................................................. 4–48 4.7 Connecting the Terminal ..................................................................................................... 4–48 4.
Table of ContentsTable of Contents DMD20/DMD20LBST Universal Satellite Modem 5.8.3 5.8.4 5.8.5 5.8.6 5.8.7 5.8.8 5.8.9 5.9 Revision 14 MN-DMD20-20LBST 8K DATA (J3) ............................................................................................................... 5–15 G.703 BAL (J4).............................................................................................................. 5–16 SWITCH INTERFACE (J5) ............................................................................
Table of ContentsTable of Contents DMD20/DMD20LBST Universal Satellite Modem Revision 14 MN-DMD20-20LBST 6.2.2 Alarm Masks .................................................................................................................... 6–6 6.2.2.1 Active Alarms .............................................................................................................. 6–6 6.2.2.1.1 Major Alarms ..........................................................................................................
Table of ContentsTable of Contents DMD20/DMD20LBST Universal Satellite Modem 7.19.2 Revision 14 MN-DMD20-20LBST DVB ................................................................................................................................ 7–7 7.20 BER Specifications ................................................................................................................. 7–9 7.20.1 BER Performance (Viterbi) ....................................................................................
Table of ContentsTable of Contents DMD20/DMD20LBST Universal Satellite Modem APPENDIX B. Revision 14 MN-DMD20-20LBST FRONT PANEL UPGRADE PROCEDURE ......................................... B–1 B.1 Introduction ...........................................................................................................................B–1 B.2 Required Equipment..............................................................................................................B–1 B.3 Upgrade Procedure ........
Table of ContentsTable of Contents DMD20/DMD20LBST Universal Satellite Modem Revision 14 MN-DMD20-20LBST F.2 Setup ....................................................................................................................................... F–1 F.2.1 TCP-IP Menus ................................................................................................................. F–1 F.2.2 IP Address......................................................................................................
Table of ContentsTable of Contents DMD20/DMD20LBST Universal Satellite Modem Revision 14 MN-DMD20-20LBST H.1.2 Insert Only ...................................................................................................................... H–3 H.1.3 Mode Selection ............................................................................................................... H–4 H.1.3.1 PCM-30 ................................................................................................................
PREFACE About this Manual This manual describes the installation and operation of the DMD20/DMD20LBST Universal Satellite Modem. Conventions and References Patents and Trademarks See all of Comtech EF Data's Patents and Patents Pending at http://patents.comtechefdata.com. Comtech EF Data acknowledges that all trademarks are the property of the trademark owners. • ® DoubleTalk is licensed from "Raytheon Applied Signal Technology".
DMD20/DMD20LBST Universal Satellite ModemPreface Preface Revision 14 MN-DMD20-20LBST Cautions and Warnings IMPORTANT CAUTION IMPORTANT or NOTE indicates a statement associated with the task being performed or information critical for proper equipment function. CAUTION indicates a hazardous situation that, if not avoided, may result in minor or moderate injury. CAUTION may also be used to indicate other unsafe practices or risks of property damage.
DMD20/DMD20LBST Universal Satellite ModemPreface Preface Revision 14 MN-DMD20-20LBST Warranty Policy Comtech EF Data products are warranted against defects in material and workmanship for a period of two years from the date of shipment. During the warranty period, Comtech EF Data will, at its option, repair or replace products that prove to be defective. Repairs are warranted for the remainder of the original two year warranty, or a 90 day extended warranty, whichever is longer.
DMD20/DMD20LBST Universal Satellite ModemPreface Preface Revision 14 MN-DMD20-20LBST Customer Support Support Business Hours - Monday through Friday - 8:00 a.m. to 5:00 p.m.
Chapter 1. INTRODUCTION This chapter provides an overview of the DMD20/DMD20 LBST Universal Satellite Modem. The DMD20 will be referred to in this manual as “the standard unit” and the DMD20 LBST will be referred to as the LBST. When describing the DMD20/DMD20 LBST, it may be referred to as “the DMD20”, “the modem”, or “the unit”. 1.
DMD20/20LBST Universal Satellite Modem Introduction The DMD20 LBST (Figure 1-2) offers additional features that are not included in the standard DMD20 Modem. The features included in DMD20 LBST serves as an interface between the indoor unit (DMD20 LBST) and the outdoor units (consisting of the BUC and LNB). The output frequency of the LBST is 950 to 2050 MHz. It does not offer a 70 MHz output that is included in the standard unit.
DMD20/20LBST Universal Satellite Modem Introduction Only authorized service personnel should handle and install optional hardware options. IMPORTANT 1.2.4 Factory Installed Options Units may also be sent to the factory for hardware option installation. Please contact the Customer Service Department for information not limited to availability and to shipping costs. 1.
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Chapter 2. INSTALLATION 2.1 Unpacking and Inspection Inspect shipping containers for damage. If shipping containers are damaged, keep them until the contents of the shipment have been carefully inspected and checked for normal operation. The Universal Satellite Modem and its Installation and Operation Manual are packaged and shipped in a pre-formed, reusable cardboard carton containing foam spacing for maximum shipping protection.
DMD20/20LBST Universal Satellite Modem 2.2 Installation Installation Requirements The modem is shipped fully assembled. It does not require removal of the covers for any purpose in installation. The power supply itself is designed for universal application using from 100 to 240 VAC, 50 to 60 Hz, 1.0A. WARNING WARNING CAUTION There are no user-serviceable parts or configuration settings located inside the Chassis. There is a potential shock hazard internally at the power supply module.
DMD20/20LBST Universal Satellite Modem 2.3 Installation Removal and Assembly The Modem is shipped fully assembled. It does not require removal of the covers for any purpose in installation. Always ensure that power is removed from the before removing or installing any optional modules. Failure to do so may cause damage to the equipment. CAUTION Carefully unpack the unit and ensure that all of the above items are in the carton.
DMD20/20LBST Universal Satellite Modem Installation connection at all times. Therefore, it is imperative during installation, configuration, and operation that the user ensures that the unit has been properly grounded using the ground stud provided on the rear panel of the unit. 2.5 • In Finland: "Laite on liitettävä suojamaadoituskoskettimilla varustettuun pistorasiaan." • In Norway: “Apparatet må tilkoples jordet stikkontakt.” • In Sweden: “Apparaten skall anslutas till jordat uttag.
DMD20/20LBST Universal Satellite Modem Installation Standard Factory Configuration Settings Modulator: Data Rate: Mode: Satellite Framing: Scrambler: Drop and Insert: Inner FEC: Outer FEC: Modulation: 2.048 Mbps Closed Network None V.35 (IESS) Disabled 1/2 Rate Viterbi Disabled QPSK Frequency: Modulator Output Power: 70.000000 MHz -20 dBm Demodulator: Data Rate: Mode: Satellite Framing: Scrambler: Drop and Insert: Inner FEC: Outer FEC: Modulation: 2.048 Mbps Closed Network None V.
DMD20/20LBST Universal Satellite Modem 2.6 Installation Modulator Checkout The following descriptions assume that the unit is installed in a suitable location with prime AC power and supporting equipment available. 2.6.1 Initial Power-Up CAUTION Before initial power up of the unit, it is a good idea to disconnect the transmit output from the operating ground station equipment.
Chapter 3. THEORY OF OPERATION 3.1 Modem Hardware The modem is based on a two printed circuit card (minimum configuration) design with additional optioned printed circuit cards available for additional features. The minimum configuration consists of an L-Band/IF Assembly and a Digital Baseband Assembly. The optional printed circuit cards include a Turbo Codec printed circuit card and one of several types of Interface printed circuit card (refer to Appendix A).
DMD20/20LBST Universal Satellite Modem Theory of Operation 3.1.1 L-Band/IF Printed Circuit Card The L-Band/IF Printed Circuit Card consists of an analog modulation function, an analog complex down conversion, and two wide-band digital synthesizers. The block diagram of the L-Band/IF Assembly is shown in Figure 3-2.
DMD20/20LBST Universal Satellite Modem Theory of Operation 3.1.2 Baseband Processing Printed Circuit Card The advent of million-plus gate count FPGAs, advanced logic synthesis tools, and DSPs providing hundreds of MIPs enabled the design of a software configurable modem. Large, fast FPGAs now provide designers with what is essentially an on the fly programmable ASIC.
DMD20/20LBST Universal Satellite Modem Theory of Operation Figure 3-3 Universal Satellite Modem Functional Block Diagram 3.2.1 Front Panel The Front Panel includes a 2 x 16 backlit LCD Display, Indicator LEDs, and a Numeric Keypad (refer to Chapter 4). 3.2.2 Baseband Processing The Baseband Processor performs all of the functions required for an IBS/IDR Framing Unit, a Reed-Solomon Codec, and an E1/T1 Drop and Insert System.
DMD20/20LBST Universal Satellite Modem Theory of Operation 3.2.3 Tx Baseband Processing The Tx Data and Clock enters the Baseband Processor, passes through a Rate Adapting FIFO and enters the Framer/Drop Processor. In IDR, IBS, and D&I Modes, the framer adds the appropriate framing and ESC as defined in IESS-308 and 309. In D&I Mode, the framer acquires the terrestrial framing structure, E1 or T1, and synchronizes the Drop Processor.
DMD20/20LBST Universal Satellite Modem Theory of Operation 3.3.1 Terminal Port This port supports an asynchronous control protocol as described in Chapter 4. It is configured to support RS-232 signal levels. This port is intended for use in computer-based remote M&C. All functions of the modem may be monitored and controlled from this port via a common terminal connected to the Terminal Port. This function is front panel selectable.
DMD20/20LBST Universal Satellite Modem Theory of Operation 3.3.4 Modem Monitor Status The modems M&C system is connected to most of the circuitry on any board contained in the chassis. These connections provide status on the working condition of the circuitry as well as providing the data required for the various measurements the modem provides. The M&C processes this information and generates status indications as well as alarms when necessary.
DMD20/20LBST Universal Satellite Modem 3.6 Theory of Operation Loopback Features (Terrestrial & IF) The modem provides for a number of different loopbacks. The Loopback supported are: IMPORTANT IF Loopback – Tx IF port is looped back to the Rx IF port TX Terrestrial Loopback - Tx Data port is looped back to the Rx Data port after the interface driver/receiver.
DMD20/20LBST Universal Satellite Modem Theory of Operation Figure 3-4 Loopback Functional Block Diagram MN-DMD20-20LBST Revision 14 3–9
DMD20/20LBST Universal Satellite Modem Theory of Operation Figure 3-5 Loopback Functional Block Diagram Figure 3-6 Loopback Functional Block Diagram MN-DMD20-20LBST Revision 14 3–10
DMD20/20LBST Universal Satellite Modem 3.7 Theory of Operation Clocking Options The modem supports a number of different clocking options that can be recovered from the satellite or the terrestrial links. The various clocking options allow users to determine which clock will best fit their applications. Figure 3-7 gives an overview on how the modem processes the various clocks for the Tx Clock source and the Rx Buffer Clock source. Tx and Rx Clocks may be independently locked. INVERT NONE INV.
DMD20/20LBST Universal Satellite Modem Theory of Operation The following paragraphs define the types of clocking options available to the user at the Front Panel. 3.7.1.1 SCT (Internal Oscillator) SCTE (External Tx Terrestrial Clock) Rx Satellite Clock SCTE: Serial Clock Transmit External The SCTE clock is the Transmit Terrestrial Clock associated with the data interface.
DMD20/20LBST Universal Satellite Modem Theory of Operation The modem handles RX Buffer clock selections based on source priority levels. The user assigns priorities to the clock sources based on source selections. Source 1 has the highest priority and Source 5 being the last resort or lowest priority. If a fallback clock is selected and activity is lost at the highest priority source, the modem will fall back to the next highest priority clock with activity.
DMD20/20LBST Universal Satellite Modem Theory of Operation 3.7.3 EXT REF: External Reference, Top BNC Port, J10 This is not actually a clock, but does have some clocking implications. When the external reference is used, the master oscillator within the modem is locked to the external reference, and the internal accuracy and stability of the unit assumes that of the External Reference.
DMD20/20LBST Universal Satellite Modem Theory of Operation The DMD20 & 20LBST supports Radyne HDLC and Comtech HDLC modes, offering compatibility with the SLM5650A Bridge Interface. IMPORTANT 3.9 Reed-Solomon Codec Refer to Figure 3-8, Figure 3-9, and Table 3-1.
DMD20/20LBST Universal Satellite Modem Theory of Operation 3.9.3 Interleaving Interleaving depths of 4, 8, or 12 R-S blocks are allowed. This allows burst errors to be spread over multiple blocks in order to enhance the error correcting performance of the R-S Codec. For Intelsat Network Modes, the interleaving depth is automatically set to 4 for QPSK or BPSK, or 8 for 8PSK.
DMD20/20LBST Universal Satellite Modem Theory of Operation 3.10 Asynchronous Overhead Operation (Framing/Multiplexer Capability) The Asynchronous Framing/Multiplexer is capable of multiplexing a relatively low-speed overhead channel onto the terrestrial data stream resulting in a slightly higher combined or aggregate data rate through the modem. The overhead channel is recovered at the far end.
DMD20/20LBST Universal Satellite Modem Theory of Operation Table 3-2 Kbps Baud Rate Example for Standard IBS Kbps Baud Rate Example for Enhanced Mode 1216 1280 1344 1408 1472 1536 1600 1664 1728 1792 1856 1920 1984 2048 19200 19200 19200 19200 19200 19200 19200 19200 19200 19200 19200 19200 19200 19200 3.11 Standard IBS Mode In the first or “Normal” mode, all bit assignments are per the IBS standard.
DMD20/20LBST Universal Satellite Modem Theory of Operation 3.12 Asynchronous Multiplexer Mode Since many of the frame bits in the standard IBS mode are not used, an “Enhanced” Multiplexer Mode has been implemented that can be engaged under software control. Since this mode changes the use of many of the framed non-data bits, this mode is only usable when the modem is at both ends of a link.
DMD20/20LBST Universal Satellite Modem Theory of Operation In Pass Thru Mode, there is no formatting or deformatting of the input data in the buffer, and it is transmitted on a first-in first-out basis. In band data entering the remote port is inserted into the user data stream. The in-band data is received and passed on to the user without any deformatting or depacketizing involved. The maximum in band rate supported is 115200bps. The Asynchronous Data Interface (J17) is a 9-Pin Female “D” Connector.
DMD20/20LBST Universal Satellite Modem 3.14.2 Theory of Operation Aggregate Data Rate The aggregate data rate equals: User Data Rate + In-Band Rate + Synchronizing Overhead Rate Because SCC adjusts the overhead so that there are an equal number of user data bits in each slot, the synchronizing overhead cannot be easily calculated. However, dividing the In-Band Rate by the Control Ratio can approximate it.
DMD20/20LBST Universal Satellite Modem 3.14.4 Theory of Operation Actual Overhead Rate Calculation The following is the actual calculation the modem does to calculate the overhead ratio: 1. The modem calculates the minimum in-band rate to limit the size of the user data slots to 2,500 bits (the result is truncated to an integer). Minimum In-Band = (User Data Rate * Control Ratio)/((Control Ratio + 1) * 250) 2.
DMD20/20LBST Universal Satellite Modem 3.14.5 Theory of Operation SCC Overhead Channel Setup 1. Set the Framing Mode (located under Mod and Demod Data Menus) to SCC. After doing this, two new menus will appear to the right of the Framing Menu, for both the Mod and Demod. The new menus will be: SCC CTL RATIO SCC INBAND RATE 2.
DMD20/20LBST Universal Satellite Modem Theory of Operation SCC Overhead Chart Examples (Viterbi 3/4 w/V.35 Scrambler) Modem Data Rate Kbps SCC Control Channel Rate In-Band Overhead Rate Setting Symbol Rate 9.6 1/1 300 6800 9.6 1/2 300 6700 9.6 1/3 300 6667 9.6 1/4 300 6650 9.6 1/5 300 6641 9.6 1/6 300 6634 9.6 1/7 300 6629 9.6 1/1 9600 19200 9.6 1/2 9600 17067 9.6 1/3 9600 15543 9.6 1/4 9600 14400 9.6 1/5 9600 14400 9.6 1/6 9600 14400 9.
DMD20/20LBST Universal Satellite Modem Theory of Operation 3.15 DoubleTalk Carrier-in-Carrier Option B E F OR E AT T E MP T ING T O C OMMIS S ION A S AT E L L IT E L INK US ING C AR R IE R -INC AR R IE R , T HE US E R MUST E NS UR E T HAT T HE L INK IS R OB US T E NOUG H F OR NOR MAL OP E R AT ION. ONL Y WHE N T HIS HAS B E E N DONE – AND AL L S Y S T E M IS S UE S (E .G ., ANT E NNA-P OINT ING , C AB L ING , T E R R E S T R IAL INT E R F E R E NC E , S AT E L L IT E INT E R F E R E NC E , E T C .
DMD20/20LBST Universal Satellite Modem Theory of Operation • Link must be full duplex. • A Radyne DMD20 must be used at the end of the link where the cancellation needs to take place. • The transponder is operated as Loopback. That is, each end of the link must be able to see a copy of its own signal in the return (downlink) path from the satellite. The looped back signal is then subtracted which leaves the signal from the distant end of the link.
DMD20/20LBST Universal Satellite Modem Theory of Operation 4) Link Asymmetries: Various asymmetries in the forward and return link can produce differences in the relative power of the two received signal components. These can be both deterministic (static) or random (and time varying). An example of the former would be the differences resulting from antenna size/gain variations between the two ends of the link.
DMD20/20LBST Universal Satellite Modem 3.15.3 Theory of Operation Operational Recommendations The rules for CnC operation are summarized below: • Both earth stations share the same footprint so each sees both carriers; • CnC carriers are operated in pairs; • One outbound with multiple return carriers is not allowed; • Asymmetric data rates are allowed (see Section 3.15.
DMD20/20LBST Universal Satellite Modem 3.15.4 Theory of Operation System Functionality and Operational Considerations Figure 3-11 illustrates a conventional, full duplex satellite link where two carriers are placed in non-overlapping channels. Figure 3-11. Conventional FDMA Link Figure 3-12 shows the same link using the Radyne DMD20 equipped with the DoubleTalk Carrier-in-Carrier option. Note that now only 50% of the bandwidth is being used, as now both carriers are occupying the same bandwidth.
DMD20/20LBST Universal Satellite Modem Theory of Operation CDM-625 with CnC - with CnC DMD20 DMD20 - with CnC Figure 3-12. Same Link Using Radyne DMD20 and DoubleTalk Carrier-in-Carrier Traditional Full Duplex Link Duplex Link with DoubleTalk Carrier-in- Carrier Figure 3-13.
DMD20/20LBST Universal Satellite Modem Theory of Operation One possible way to mitigate false peaks is to narrow the correlation window. For example, if the delay is known to be around 240ms, set the minimum search delay to 230ms and the maximum search delay to 250ms.
DMD20/20LBST Universal Satellite Modem Theory of Operation Figure 3-14. DoubleTalk Carrier-in-Carrier Signals Referring to Figure 3-14: Modem 1 and Modem 2 transmit signals S1 and S2 respectively. The satellite receives, translates, and retransmits the composite signal. The downlink signals S1* and S2*, received at Modem 1 and Modem 2 differ from the transmit signals primarily in terms of phase, frequency, and delay offsets.
DMD20/20LBST Universal Satellite Modem 3.15.6 Theory of Operation Margin Requirements Typical interfering signal cancellation is 28 to 35 dB (depending on the product). The residual interfering signal appears as noise causing a slight degradation of the Eb/No. To compensate for the residual noise, a small amount of additional link margin is required to maintain the BER.
DMD20/20LBST Universal Satellite Modem 3.15.8.1 Theory of Operation Symmetric Data Rate Link Consider the following example: Satellite & Transponder Galaxy 18 @ 123º W, 13K/13K Earth Station 1 Phoenix, AZ – 4.6 m Earth Station 2 Phoenix, AZ – 2.4 m Data Rate 512 kbps / 512 kbps The traditional link was based on QPSK TPC 3/4 and required 0.96 MHz of leased BW.
DMD20/20LBST Universal Satellite Modem Theory of Operation Link parameters and LST summary for QPSK, LDPC 2/3 with Carrier-in-Carrier is as follows: MN-DMD20-20LBST Revision 14 3–35
DMD20/20LBST Universal Satellite Modem Theory of Operation The link budget summary for the different MODCOD combinations is as follows: S. No. Modulation & FEC Allocated BW (MHz) PEB (MHz) Leased BW (MHz) Savings Compared to Original PSD Ratio (dB) 1 8-QAM, LDPC 2/3 0.3584 1.1468 1.1468 -20% 2.1 2 QPSK, LDPC 3/4 0.47785 0.6734 0.6734 30% 2.1 3 QPSK, LDPC 2/3 0.53735 0.5777 0.5777 40% 2.1 4 QPSK, LDPC 1/2 0.7168 0.5184 0.7168 25% 2.
DMD20/20LBST Universal Satellite Modem 3.15.8.2 Theory of Operation Asymmetric Data Rate Link As occupied (or allocated) bandwidth of a Carrier-in-Carrier circuit is dictated by the larger of the two carriers, it is strongly recommended that the smaller carrier be spread as much as possible using a lower order modulation and/or FEC, while meeting the PSD ratio spec.
DMD20/20LBST Universal Satellite Modem 3.15.8.3 Theory of Operation Power Limited Links Carrier-in-Carrier can provide substantial savings even when the original link is power limited. Spreading the carrier by using a lower modulation and/or FEC along with latest FEC such as VersaFEC can substantially reduce the total power which can then be traded with bandwidth using Carrier-in-Carrier.
DMD20/20LBST Universal Satellite Modem 3.15.9 Theory of Operation Carrier-in-Carrier Commissioning and Deployment Prior to commissioning a Carrier-in-Carrier link, it is critical that the link is fully tested in non Carrier-in-Carrier mode and all system issues including external interference, antenna pointing, cabling, SSPA backoff are resolved. Only after the link is robust, should the user attempt turning on Carrier-in-Carrier.
DMD20/20LBST Universal Satellite Modem Theory of Operation 3.15.10 Validating Carrier-in-Carrier Performance Carrier-in-Carrier performance can be easily validated by verifying that Eb/No degradation due to Carrier-in-Carrier is within published specification for the observed Power Spectral Density Ratio.
DMD20/20LBST Universal Satellite Modem 3.15.11 Theory of Operation Operational References 3.15.12 Carrier-in-Carrier Link Budget Calculation The following steps are required for calculating the link budget for a Carrier-in-Carrier Link: 1. Calculate the link budget for both carriers in the duplex link, with required CnC margin: spec for the Radyne DMD20.
DMD20/20LBST Universal Satellite Modem Theory of Operation 3.15.13 Estimating PSD Ratio PSD can be estimated from a link budget using Downlink EIRP and Symbol Rate: PSD = Downlink EIRP – 10 * Log (Symbol Rate) PSD Ratio Example: Carrier Downlink EIRP Symbol Rate Power Spectral Density A to B B to A 27 dBW 24 dBW 500 ksps 375 ksps -29.99 dBW/Hz -31.74 dBW/Hz PSD Ratio (@ A) = -29.99 – (-31.74) = 1.75 dB PSD Ratio (@ B) = 01.74 – (-29.99) = -1.75 dB 3.15.13.
DMD20/20LBST Universal Satellite Modem Theory of Operation 3.15.13.2 Estimating PSD Ratio from Satmaster 3.15.13.3 Estimating PSD Ratio Using Spectrum Analyzer PSD Ratio or CnC Ratio can also be estimated using a Spectrum Analyzer capable of integrating the signal power in a given bandwidth.
DMD20/20LBST Universal Satellite Modem 3.15.
DMD20/20LBST Universal Satellite Modem Theory of Operation Power Equivalent Bandwidth Power Equivalent Bandwidth (PEB) is the transponder power used by a carrier, represented as bandwidth equivalent. PEB Calculation Example: • • • • • • Transponder EIRP = 37 dBW Output Backoff (OBO) = 4 dB Available EIRP = 37 – 4 = 33 dBW = 103.3 = 1955.26 Watts Transponder Bandwidth = 36 MHz Power Available / MHz = 1955.26 / 36 = 54.424 W If a carrier uses 24 dBW, its PEB = 102.4 / 54.424 = 4.
DMD20/20LBST Universal Satellite Modem Theory of Operation Co+No/No Carrier Density (Co) + Noise (No) to Noise Density (No) ratio: Unit is dB C/N = C/No – 10 log B [where B is bandwidth in Hz] Eb/No = C/No – 10 log R [where R is data rate in bits/sec] = C/N + 10 log B – 10 log R = C/N – 10 log (Spectral Efficiency) Eb/No = 10 log (10 ((Co+No/No)/10) – 1) – 10 log (Spectral Efficiency) [Spectral Efficiency is in bps / Hz] 3.
Chapter 4. USER INTERFACES 4.1 User Interfaces This section contains information pertaining to the user interfaces for the modem. There are four user interfaces available for the modem. These are: • • 4.2 Front Panel Interface – Refer to section 4.2. Terminal Interface - :Refer to section 4.5. Front Panel User Interface The Front Panel of the DMD20/DMD20 LBST allows for complete control and monitor of all DMD20/DMD20 LBST parameters and functions via a keypad, LCD display and status LEDs.
DMD20/20LBST Universal Satellite Modem User Interfaces 1 2 3 4 Figure 4-1 DMD20 Front Panel 1 2 3 4 Figure 4-2 DMD20 LBST Front Panel Table 4-1 Item Number Description Function 1 LCD Front Panel Display Displays operating parameters and Configuration data 2 Cursor Control Arrow Keys Controls the up, down, right and left motion of the cursor in the LCD Display window 3 Numeric Keypad Allows entry of numeric data and Clear and Enter function keys 4 Front Panel LED Indicators See Parag
DMD20/20LBST Universal Satellite Modem User Interfaces 4.2.1 LCD Front Panel Display The front panel display is a 2 line by 16-character LCD display. The display is lighted and the brightness can be set to increase when the front panel is currently in use.The LCD display automatically dims after a period of inactivity. The display has two distinct areas showing current information. The upper area shows the current parameter being monitored, such as ‘Frequency’ or ‘Data Rate’.
DMD20/20LBST Universal Satellite Modem User Interfaces 4.2.4 Front Panel LED Indicators Twelve LEDs on the Front Panel (Refer to Table 4-3) indicate the status of operation. The LED colors maintain a consistent meaning. Green signifies that the indication is appropriate for normal operation, Yellow means that there is a condition not proper for normal operation, and Red indicates a fault condition that will result in lost communications.
DMD20/20LBST Universal Satellite Modem User Interfaces Figure 4-3 Entering New Parameters Following a valid input, the unit will place the new setting into the nonvolatile EEPROM making it available immediately and available the next time the unit is powered-up. 4.4 Front Panel Control Screen Menus The Front Panel Control Screens are broken down into sections under several Main Menus. Menu items for LBST only will be in shaded text. IMPORTANT 4.4.
DMD20/20LBST Universal Satellite Modem User Interfaces 4.4.2 Modulator Menu Options and Parameters NETWORK SPEC {IDR, IBS, DROP & INSERT, DVB SAT, CLOSED NET} The Network Spec Command sets a number of parameters within the modem to meet a specification. The purpose is to eliminate keystrokes and potential compatibility problems. Data rates not covered by a given network specification will not be allowed.
DMD20/20LBST Universal Satellite Modem User Interfaces DVB: Per EN301-421 & En301-210 Data Rates: Framing Type: Scrambler Type: Spectrum Mask: All Rates DVB DVB DVB 0.25, 0.35 Closed Net: All possible combinations allowed, however, a DVB setting requires the DVB network spec. . STRAP CODE {Refer to Strap Code Guide, Appendix H} The Strap Code is a quick set key that sets many modem parameters. Consult the strap code guide for available strap codes.
DMD20/20LBST Universal Satellite Modem User Interfaces MODULATION {BPSK, QPSK, OQPSK, 8PSK, 16QAM, 8QAM} Allows the user to select the modulation type. SPECTRAL MASK {Intelsat 0.35, DVB SAT 0.35, DVB SAT 0.25, DVB SAT 0.20} Allows the user to set the spectral shape of Tx Data Filter. COMPENSATION {0.0 – 1.0} Allows you to offset output power by up to 1 dbm. This is intended as a correction for user cabinet connectors.
DMD20/20LBST Universal Satellite Modem User Interfaces IN-BAND RATE {150, 300, 600, 1200, 2400, 4800, 9600, 19200} Allows the user to select the rate of in-band data for the ES to ES, Async overhead channel. Only displayed when Efficient D&I with Enhanced Async are selected. SCC CTL RATIO {1/1, 1/2, 1/3, 1/4, 1/5, 1/6, 1/7}, Allows the user to simulate the framing used by the Satellite Control Channel Option (Pass Thru Mode only).
DMD20/20LBST Universal Satellite Modem User Interfaces option if the BUC does not support FSK or if the customer does not want to utilize the FSK option. CODAN: Enables the FSK Communication link for CODAN BUCs only. This feature enables the DMD20LBST to retrieve and display certain BUC parameters on the front panel of the modem. TERRASAT: Enables the FSK communication link for Terrasat BUCs only.
DMD20/20LBST Universal Satellite Modem User Interfaces HI ALARM THRSH {0.00 Volts} Allows user to select high alarm limit/threshold for BUC voltage. LOW ALARM THRSH {0.00 Amps} Allows user to select lower alarm limit/threshold for BUC current. HI ALARM THRSH {0.00 Amps} Allows user to select high alarm limit/threshold for BUC current. CARR DLY (SEC) {0 to 255} Allows the user to select the time delay after power-up before the Tx Carrier may be enabled. This allows time for the BUC to stabilize.
DMD20/20LBST Universal Satellite Modem User Interfaces AUPC (menu) LOCAL AUPC (menu) AUPC MODE The 'LOCAL AUPC CONFIGURATION' Menu contains the local configuration parameters for the AUPC Function. {DISABLED, NEAR SIDE, RADYNE, EFDATA} DISABLED: Allows the user to enable or disable the Local AUPC Function of the local modem. EFDATA: Enables EFDATA Local AUPC Function.
DMD20/20LBST Universal Satellite Modem User Interfaces RADYNE: When configured for Radyne AUPC, the maximum Transmit Power is the highest power setting that will be used when the remote modem commands an increase of the Transmit Power from the Local modem NEARSIDE: When configured for NEARSIDE AUPC the maximum Transmit Power is the highest power setting that will be used by the local modem when the Eb/No decreases below the Eb/No target. TARGET Eb/No {4.
DMD20/20LBST Universal Satellite Modem User Interfaces AUPC MODE {DISABLE,NEAR SIDE, EFDATA} Allows the user to enable or disable the AUPC Function of the remote modem. The remote AUPC Function is the response of the local modem to commands for an increase or decrease of the Transmit Power in 0.5 dB steps and the command to change to the setting indicated in the 'REMOTE CL ACTION' Menu of the remote modem upon receiver loss of lock.
DMD20/20LBST Universal Satellite Modem User Interfaces 4.4.3 Demodulator Menu Options and Parameters NETWORK SPEC {IDR, IBS, DROP & INSERT, DVB SAT, LDPC, CLOSED NET} The Network Spec Command sets a number of parameters within the modem to meet a specification. The purpose is to eliminate keystrokes and potential compatibility problems. Data rates not covered by a given mode will not be allowed.
DMD20/20LBST Universal Satellite Modem User Interfaces Closed Net: All possible combinations allowed, however, a DVB setting requires the DVB network spec. STRAP CODE {Refer to Strap Code Guide, Appendix H} The Strap Code is a quick set key that sets many modem parameters. Consult the strap code guide for available strap codes.
DMD20/20LBST Universal Satellite Modem User Interfaces REACQ RANGE (Hz) {0 – 65535 Hz} Allows the user to set the reacquisition sweep in 1 Hz increments. ADJ CARRIER PWR {Normal, Suppressed} Allows the user to indicate adjacent carrier as Normal or Suppressed (High Power). Unit will increase or decrease post decimination gain appropriately. FAST ACQUISITION {DISABLED, ENABLED} Allows the user to disable or enable the Rx fast acquisition capability.
DMD20/20LBST Universal Satellite Modem ROTATION AMBIG User Interfaces {n (x.x.x)}, n=0..7, x=0 or 1 (8PSK Only) Allows the user to manually set the rotational ambiguity of the uncoded* 8PSK constellation. This will force the rotation to one of the eight possible states after demodulator lock. *This is not a normal mode of operation for the modem. TPC INTERLEAVER {DISABLED, ENABLED} Allows the user to disable or enable TPC Interleaver. Valid only for Radyne Legacy turbo codes TPC.495 and TPC.793.
DMD20/20LBST Universal Satellite Modem User Interfaces BPSK SYMB PAIR {NORMAL, SWAPPED} Allows the user to swap the I & Q Channels, when using BPSK Modulation. ESC OVERHEAD {VOICE X2, DATA 64KBPS} IDR ESC Channel used for Voice or 64 K data channel. Only available when IDR Network is selected. REED-SOLOMON (menu) These selections are visible only when the Reed-Solomon Option is installed. ENABLE/DISABLE {ENABLED, DISABLED} Allows the user to Enable/Disable the Reed-Solomon Encoder.
DMD20/20LBST Universal Satellite Modem HI ALARM THRSH CNC (menu) User Interfaces {0.00 Amps} Allows user to select high alarm limit/threshold for LNB current. These selections are visible only when the Carrier in Carrier card is installed. ENABLE/DISABLE {ENABLED, DISABLED} Allows the user to Enable/Disable the Carrier in Carrier.
DMD20/20LBST Universal Satellite Modem User Interfaces any lower priority traffic. With this setting, the lower priority traffic can starve. ETH CRC ROUTE {NORMAL, BYPASS} Determines how the modem will route a packet with a bad CRC. In normal mode the modem will drop a packet that has an incorrect CRC, when bypassed the modem will pass on the packet even with an incorrect CRC. ETH HDLC {RADYNE, COMTECH} Selects Radyne’s HDLC or Comtech’s HDLC.
DMD20/20LBST Universal Satellite Modem User Interfaces ESC CHAN#1 (dB) {-20 to +10 dB} Allows user to select ESC Voice Channel Gain. Only displayed when IDR NETWORK and VOICE Channel are selected. ESC CHAN#2 (dB) {-20 to +10 dB} Allows user to select ESC Voice Channel Gain. Only displayed when IDR NETWORK and VOICE Channel are selected. RX SETUP (menu) CIRCUIT ID Provides entry of Rx Circuit Identifier.
DMD20/20LBST Universal Satellite Modem User Interfaces TX ACT, RX ACT, TX EDIT, RX EDIT, USER 1 - USER 8, ROM 1 -ROM 8 SAT CH TERRCH {1-31 1-31} The up/down arrow keys allow you to traverse the sat terr pairings. The slot numbers may be edited using the keypad. Allows the user to edit the Tx Edit map and specify the terrestrial slots that will be dropped into the assigned satellite channels. The satellite channels are fixed and the number of channels is determined by the data rate.
DMD20/20LBST Universal Satellite Modem User Interfaces REF FREQ SRC {INTERNAL, EXTERNAL, HIGH STABILITY} Allows the user to select the Frequency Reference Source. High Stability is only displayed if the appropriate hardware is detected. REF FREQ (MHz) Allows the user to select the reference clock frequency in MHz. BB RELAYS {IBS ALMs, IBS/MNR ALMs, IBS/MNR/MJR ALM, RTS ALARM} IBS ALMs: Only supports IBS prompt and service alarms.
DMD20/20LBST Universal Satellite Modem ES BAUDRATE User Interfaces {150 – 1024} For IBS ES to ES {150 – 19200} For ES to ES Enhanced {150 – 115200} For SCC Communications ES to ES : Fixed Baud Rate based on IBS Network Specification. Available rates are listed in Table 3-3. ES to ES Enhanced: Allows user to select the Interface Baud Rate. This selection will allow the user to set rate as listed in Table 3-3. SCC: Allows user to select the interface Baud rate.
DMD20/20LBST Universal Satellite Modem User Interfaces TOTAL PACKETS Displays the total number of Ethernet packets received from the satellite (Only visible when Ethernet is selected as the interface type). ERROR PACKETS Displays the number of error Ethernet packets received from the satellite (Only visible when Ethernet is selected as the interface type). PKT ERROR RATE Displays the satellite Packet Error Rate (Only visible when Ethernet is selected as the interface type).
DMD20/20LBST Universal Satellite Modem User Interfaces +12V SUPPLY Displays the measured voltage of the +12 Volt power bus located inside the modem. +20V SUPPLY Displays the measured voltage of the +20 Volt power bus located inside the modem. -12V SUPPLY Displays the measured voltage of the -12 Volt power bus located inside the modem. LNB CURRENT Displays the measured current of the LNB. LNB VOLTAGE Displays the measured voltage of the LNB. BUC CURRENT Displays the measured current of the BUC.
DMD20/20LBST Universal Satellite Modem User Interfaces 4.4.6 Alarms Menu Options and Parameters Masking alarms may cause undesirable modem performance. CAUTION CURRENT ALARMS (menu) TX MAJOR (menu) Status Edit Table FPGA CFG {Pass/Fail, Unmasked/Masked} Indicates a transmit FPGA configuration failure. DSP CFG {Pass/Fail, Unmasked/Masked} Indicates a transmit DSP configuration failure. SCT CLOCK PLL {Pass/Fail, Unmasked/Masked} Indicates that the Tx SCT Clock PLL is not locked.
DMD20/20LBST Universal Satellite Modem User Interfaces TX MINOR (menu) TERR CLK ACT {Pass/Fail, Unmasked/Masked} Indicates no Terrestrial Clock activity. TERR DATA ACT {Pass/Fail, Unmasked/Masked} Indicates no Tx Data activity. TX TERR AIS {Pass/Fail, Unmasked/Masked} Indicates that AIS has been detected in the Tx Data Stream. DnI FRAME LOCK {Pass/Fail, Unmasked/Masked} Indicates the framing unit is unable to find the expected terrestrial framing pattern.
DMD20/20LBST Universal Satellite Modem User Interfaces RX MAJOR (menu) FPGA CFG {Pass/Fail, Unmasked/Masked} Indicates a receive FPGA hardware failure. DSP CFG {Pass/Fail, Unmasked/Masked} Indicates a receive DSP failure. SIGNAL LOCK {Pass/Fail, Unmasked/Masked} Indicates that the demod is unable to lock to a signal. INPUT LVL THRESH {Pass/Fail, Unmasked/Masked} Indicates Rx signal level has fallen below input threshold.
DMD20/20LBST Universal Satellite Modem User Interfaces RX MINOR (menu) BUFF UNDERFLOW {Pass/Fail, Unmasked/Masked} Indicates that a Doppler Buffer underflow has occurred. BUFF NEAR EMPTY {Pass/Fail, Unmasked/Masked} Indicates that the Doppler Buffer is about to underflow. BUFF NEAR FULL {Pass/Fail, Unmasked/Masked} Indicates that the Doppler Buffer is about to overflow. BUFF OVERFLOW {Pass/Fail, Unmasked/Masked} Indicates that a Doppler Buffer overflow has occurred.
DMD20/20LBST Universal Satellite Modem User Interfaces IBS BER {Pass/Fail, Unmasked/Masked} Indicates that there are more than one in 1000 bits in error in IBS Mode. RX DVB FRM LOCK {Pass/Fail, Unmasked/Masked} Indicates that the Rx Satellite Data Stream Framing is not DVB. COMMON (menu) TERR FPGA CFG {Pass/Fail, Unmasked/Masked} Indicates an Interface Card FPGA configuration failure. CODEC FPGA CFG {Pass/Fail, Unmasked/Masked} Indicates Turbo Codec Card FPGA configuration failure.
DMD20/20LBST Universal Satellite Modem -12V SUPPLY LATCHED ALARMS User Interfaces {Pass/Fail, Unmasked/Masked} Displays the measured voltage of the -20 Volt power bus located inside the modem.
DMD20/20LBST Universal Satellite Modem User Interfaces RX MAJOR (menu) FPGA CFG DSP CFG SIGNAL LOCK INPUT LVL THRESH FRAME LOCK MULTIFRAME LOCK LB SYNTH PLL IF SYNTH PLL ETHERNET WAN LNB CURRENT LNB VOLTAGE RX MINOR (menu) BUFF UNDERFLOW BUFF NEAR EMPTY BUFF NEAR FULL BUFF OVERFLOW RX DATA ACTIVITY SAT AIS DnI FRAME LOCK DnI M-FRAME LOCK INSERT CRC T1/E1 SIGNALING IFEC LOCK TPC CONFLICT CHK OFEC LOCK INTERLEAVER RS UNCORR.
DMD20/20LBST Universal Satellite Modem User Interfaces RX AGC LEVEL RX LEVEL IBS BER RX DVB FRM LOCK COMMON (menu) TERR FPGA CFG CODEC FPGA CFG CODEC DEV CFG EXT CLOCK ACT EXT REF ACT EXT REF LOCK ETHERNET WAN VOLTAGE (menu) +1.5V RX SUPPLY +1.5V TX SUPPLY +3.3V SUPPLY +5V SUPPLY +12V SUPPLY -12V SUPPLY +20V SUPPLY CLEAR LATCHED ((ENTER)) Allows the user to reset the latched alarms by pressing on the keypad.
DMD20/20LBST Universal Satellite Modem User Interfaces IDR1 SAT ALARM 3 {PASS, FAIL} IDR1 SAT ALARM 4 {PASS, FAIL} IBS SAT ALARM {PASS, FAIL} T1E1 SATTERR ALM {PASS, FAIL} SAT MAP SUMMARY {NONE, BK 1; BK 2; BK 1&2; BK 3; BK 1&3; BK 2&3; BK 1&2&3; BK 4; BK 1&4; BK 2&4; BK 1&2&4; BK 3&4; BK 1&3&4; BK 2&3&4; BK 1&2&3&4} Summary alarm is given when criteria meets the selection above. NOTE:The following alarms identify the control status of the alarms transmitted to the distant satellite end.
DMD20/20LBST Universal Satellite Modem User Interfaces FRONT PANEL (menu) BKLT LEVEL {OFF, LOW, MED, HIGH} Allows the user to enter the backlight intensity level. BKLT TIMEOUT {00 - 99} Allows the user to enter the length of time (in minutes ) of keyboard inactivity before the backlight shuts off. 00 = no timeout. KEY CLICK {ON, OFF} Allows the user to enable or disable the audible beep each time a key is pressed. Illegal entries will still cause a beep to be heard.
DMD20/20LBST Universal Satellite Modem User Interfaces TCP/IP (menu) BOOT MODE {DEFAULT, NON-VOL, BOOTP, IP TEST} DEFAULT: During initialization (boot up), the modem will restore the web setting to the standard IP Mask and addresses supplied by the modem. The modem will be taken off the network and will not be accessible. The Default settings are: IP Address Mask: 255.000.000.000 (FF.00.00.00 hex) Modem IP Address: 010.000.000.001 (C0.A8.00.EE hex) Server IP Address: 010.001.001.001 (0A.01.01.
DMD20/20LBST Universal Satellite Modem User Interfaces SERVER IP ADDR {XXX.XXX.XXX.XXX} Hexidecimal Address {ddd.ddd.ddd.ddd} Decimal Address The IP Address of the Boot Server and the address of the SNMP Trap Server when SNMP is active. If a server is used and there is no local router, this address must be consistent with the modem address. If a router has been specified, the address is presumed to be reachable via the router. Broadcast and loop back addresses will not be allowed.
DMD20/20LBST Universal Satellite Modem User Interfaces The dev context allows a user with appropriate authentication to access the device control portion of the MIB. These OIDs are used to control the devices satellite link and operation. TRAP VERSION {V1, V2} This controls the type of message format used when a message trap is generated by the equipment and bound for a SNMP Host. Messages will only be sent if the unit has been authorized to do so.
DMD20/20LBST Universal Satellite Modem User Interfaces WEB CONFIRMATION {ENABLE, DISABLE} USER 1 ACCESS GROUP {NO GROUP, GUEST, OPER, ADMIN} Access rights represent the following: No Group: Denies Access Guest: Users are able to navigate most of the site, and view modem parameter settings. Oper: Users can monitor and control parameter settings, and change their own authentication passwords.
DMD20/20LBST Universal Satellite Modem User Interfaces front panel. The user can clear all characters from the front panel screen. USER RESET Resets group and password. USER 3 ACCESS GROUP {NO GROUP, GUEST, OPER, ADMIN} Access rights represent the following: No Group: Denies Access Guest: Users are able to navigate most of the site, and view modem parameter settings. Oper: Users can monitor and control parameter settings, and change their own authentication passwords.
DMD20/20LBST Universal Satellite Modem IMPORTANT User Interfaces Only the appropriate of the VCO adjustment screens listed below will be displayed. These are protected fields, to prohibit accidental changes. To edit the field, the user must depress all four of the direction arrow keys simultaneously. INT VCO ADJUST {0% - 100%} Allows the user to adjust the internal frequency reference for calibration. Only displayed of the system reference clock is INTERNAL.
DMD20/20LBST Universal Satellite Modem User Interfaces CNC DEBUG REGS1 Used for factory test only. CNC DEBUG REGS2 Used for factory test only. CNC DEBUG REGS3 Used for factory test only. CNC DEBUG REGS4 Used for factory test only. SCALE AMPLTD Used for factory test only. AR THRESH FACTOR Used for factory test only. PLL LOOP THRESH Used for factory test only. ACQ SNTR THRESH Used for factory test only. PLL LOOP GAIN Used for factory test only.
DMD20/20LBST Universal Satellite Modem User Interfaces D&I AUPC 8PSK 16QAM TURBO 52 MBPS OM73 SCRAMBLING DVB EDMAC ETH WAN MONITOR 8QAM LDPC 20 MBPS 4.4.8 Test Menu Options and Parameters TX TEST PATTERN {NONE, 2047, 2^15-1, 2^23-1} Allows the user to enable the tests listed above. RX TEST PATTERN {NONE, 2047, 2^15-1, 2^23-1} Allows the user to enable the tests listed above. PATTERN SYNC {YES, NO} Yes indicates that the RX Test Pattern is in sync.
DMD20/20LBST Universal Satellite Modem User Interfaces IF: IF loopback loops the IF output of the Modulator to the IF input of the Demodulator. If using 8PSK or 16QAM Modulation, the output power must be above -15 dB. TERR TX/RX: Enables both. Baseband loopback is performed at interface between the Baseband Processor Card and the Modem Card. This ensures Framer/Deframer integrity. BASEBAND TX/RX: Enables both Baseband Tx and Baseband Rx. NONE: No loopback performed.
DMD20/20LBST Universal Satellite Modem 4.5 User Interfaces Terminal Mode Control The Terminal Mode Control allows the use of an external terminal or computer to monitor and control the modem from a full screen interactive presentation operated by the modem itself. No external software is required other than VT-100 Terminal Emulation Software (e.g. “Procomm” for a computer when used as a terminal. The Control Port is normally used as an RS–232 Connection to the terminal device.
DMD20/20LBST Universal Satellite Modem 4.6 User Interfaces Terminal Port User Interface The Remote Port (J20) of the modem allows for complete control and monitoring of all parameters and functions via an RS-232 Serial Interface, or RS-485 for RLLP Protocol. ‘Terminal Mode’ can be entered from the front panel by selecting “System” and then “Control Mode” followed by “Terminal”. The baud rate and evaluation type can be changed at the front panel by using the System>Baud Rate Menu.
Chapter 5. REAR PANEL INTERFACES This section discusses the electrical interfaces available from the rear panel. All locations are as viewed from the rear of the unit unless otherwise specified. 5.1 DMD20/DMD20 LBST Connections All DMD20/DMD20 LBST connections are made to labeled connectors located on the rear of the unit (refer to Figure 5-1 for the DMD20 and Figure 5-2 for the DMD20 LBST). The connector definitions below are those on the DMD20/DMD20 LBST unit.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces Figure 5-1 DMD20 Universal Satellite Modem Rear Panel Configuations MN-DMD20-20LBST Revision 14 5–2
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces Figure 5-2 DMD20LBST Universal Satellite Modem Rear Panel Configurations MN-DMD20-20LBST Revision 14 5–3
DMD20/20LBST Universal Satellite Modem 5.2 Rear Panel Interfaces Compact Flash The compact flash slot is located on the right side as viewed from the rear of the unit. A 128 or 256 Mbit flash memory card that stores all the modem M&C and operational data. It must be present when the modem is operating. 5.3 Power Input Modules 5.3.1 AC Power Input Module AC Input Module (Figure 5-1) is located on the left side of the unit.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces 5.4.4 RX IF The Receive IF Input Port is a 75-Ohm Female BNC Connector that is used for 70/140 MHz IF. If the customer orders the 70/140 MHz IF, the Transmit IF Output Port is a 75-Ohm Female BNC Connector. 5.4.5 RX L-Band IF The Receive IF Input Port is a 50-Ohm SMA Female Connector that can be used for L-Band IF. The IF Frequency can be programmed from 950 to 1750 MHz in 1 Hz Steps. 5.4.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces Note 2: Prompt alarms can be configured to support a summary of a) Prompt alarms, b) Prompt and Tx Minor alarms, or c) Prompt and Tx minor and Tx Major Alarms. Note 3: Service alarms can be configured to support a summary of a) Service alarms, b) Service and Rx Minor alarms, or c) Service and Rx minor and Rx Major Alarms. Note 4: Service alarms can be configured to support the RTS Carrier Alarms.
DMD20/20LBST Universal Satellite Modem 5.4.10 Rear Panel Interfaces EIA-530 (J19) The EIA-530 Port is an RS-422/V.35/RS-232 Connection. It is a 25-Pin Female “D” Connector. Refer to Table 5-4 for pinouts. Table 5-4. EIA-530 Port (RS-422/V.35/RS-232) 25-Pin Female “D” Connector (J19) Pin No.
DMD20/20LBST Universal Satellite Modem 5.4.11 Rear Panel Interfaces REMOTE (J20) The Remote Port is a RS-485 or RS-232 Connection for remote monitor and control of the modem. It is a 9-Pin Female “D” Connector. Refer to Table 5-5 for pinouts. Table 5-5. Remote Port (RS-485 or RS-232) 9-Pin Female “D” Connector (J20) Pin No.
DMD20/20LBST Universal Satellite Modem 5.5 Rear Panel Interfaces DMD20 LBST Chassis Connections (Standard) 5.5.1 EXT REF (J10) The External Reference Port is a 50-Ohm Female BNC Connector and will accept the following frequencies: 1.0, 1.544, 2.0, 2.048, 5.0, and 10.0 MHz). Input level: 0.1Vpp to 5.0Vpp (Sinewave or Squarewave) 5.5.2 TX (J11) The Transmit Output Port is a 50-Ohm Type-N Connector. 5.5.3 RX (J14) The Receive Input Port is a 50-Ohm Type-N Connector. 5.5.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces Table 5-6. ALARM Port 15-Pin Female “D” Connector (J15) Pin No. 12 13 14 15 Signal Name Service – NO No Connection AGC Out Ground Signal SP2-NO SP2-NC AGC GND Direction No Direction No Direction No Direction --- Note 1: Normally open, or Normally closed, conditions indicate a faulted state or off condition.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces 5.5.8 EIA-530 (J19) The EIA-530 Port is an RS-422/V.35/RS-232 Connection. It is a 25-Pin Female “D” Connector. Refer to Table 5-8 for pinouts. Table 5-8. EIA-530 Port (RS-422/V.35/RS-232) 25-Pin Female “D” Connector (J19) Pin No.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces 5.5.9 REMOTE (J20) The Remote Port is a RS-485 or RS-232 Connection for remote monitor and control of the modem. It is a 9-Pin Female “D” Connector. Refer to Table 5-9 for pinouts. Table 5-9. Remote Port (RS-485 or RS-232) 9-Pin Female “D” Connector (J20) Pin No. 5.5.
DMD20/20LBST Universal Satellite Modem 5.8 Rear Panel Interfaces G.703 IDR/IBS Interface (Optional) The DMD20 supports G703 IDR/IBS interface. Interface options supported are G703 T1/E1/T2/E2 5.8.1 ESC ALARM (J1) The ESC (Engineering Service Circuits) Alarms Port is a 25-Pin Female “D” Connector. Refer to Table 5-6 for pinouts. Table 5-6. ESC ALARM Port 25-Pin Female “D” Connector (J1) Pin No.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces 5.8.2 64K AUDIO (J2) The 64K AUDIO Port allows for communications between Earth Stations. It is a 9-Pin Female “D” Connector that complies with IESS 308. Refer to Table 5-7a for pinouts in audio mode and Table 5-7b for pinouts in 64k mode. Table 5-7a. 64K AUDIO (In Audio Mode) Port 9-Pin Female “D” Connector (J2) Pin No.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces 5.8.3 8K DATA (J3) The 8K Data Port allows for communications between Earth Stations. It is a 15-Pin Female “D” Connector that complies with IESS 308. Refer to Table 5-8 for pinouts. Table 5-8. 8K DATA Port 15-Pin Female “D” Connector (J3) Pin No.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces 5.8.4 G.703 BAL (J4) The G.703 Interface Port (Balanced) is a 15-Pin Female “D” Connector. Refer to Table 5-9 for pinouts. Table 5-9. G.703 BAL Port 15-Pin Female “D” Connector (J4) Pin No.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces 5.8.5 SWITCH INTERFACE (J5) The Switch Interface Port is a 68-Pin High-Density Female Connector. Refer to Table 5-10 for pinouts. Table 5-10. SWITCH INTERFACE Port 68-Pin High-Density Female Connector (J5) Pin No. Signal Name Signal Direction 1 G.703 Send Data Input A G.703B SD-A Input 2 Synchronous Data Send Data Input - A SYNC SD-A Input 3 IDR ESC Backward Alarm Out - 1 Common ESCBWO 1C No Direction 4 G.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces Table 5-10. SWITCH INTERFACE Port 68-Pin High-Density Female Connector (J5) Pin No.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces Table 5-10. SWITCH INTERFACE Port 68-Pin High-Density Female Connector (J5) Pin No.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces 5.8.6 SD (DDI) (J6) The Send Data (Drop Data In) Port (Unbalanced) is a 75-Ohm Female BNC Connector. 5.8.7 DDO (J7) The Drop Data Out Port (Unbalanced) is a 75-Ohm Female BNC Connector. 5.8.8 IDI (J8) The Insert Data In Port (Unbalanced) is a 75-Ohm Female BNC Connector. 5.8.9 SD (IDO) (J9) The Send Data (Insert Data Out) Port (Unbalanced) is a 75-Ohm Female BNC Connector. 5.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces 5.10 High-Speed Serial Interface (HSSI) (Optional) 5.10.1 HSSI (J6) The HSSI (High-Speed Serial Interface) (J6) complies with the HSSI Functional and Electrical Specifications. The physical interface is a 50-Pin SCSI-2 Type Connector. Electrical levels are ECL. Gapped clocking not supported. The pinouts for this interface are listed in Table 5-11. Table 5-11. J9 – HSSI (High-Speed Serial Interface) 50-Pin Connector Pin No. (+) Pin No.
DMD20/20LBST Universal Satellite Modem 5.11.3 Rear Panel Interfaces DVB/M2P IN (J3) DVB or M2P IN Port (J3) is supported on the DB-25 female connector. It complies with RS-422 Electrical Specifications. Refer to Table 5-12a for DVB and 5-12 b for M2P pinouts for this connector. Table 5-12a.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces Table 5-12b.
DMD20/20LBST Universal Satellite Modem 5.11.4 Rear Panel Interfaces DVB/M2P OUT (J4) The DVB or M2P OUT Port (J4) is also supported on the DB-25 Female Connector. It complies with RS-422 Electrical Specifications. Refer to Table 5-13a for DVB and 5-13 b for M2P pinouts for this connector. Table 5-13a.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces Table 5-13b.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces 5.12 Ethernet Data Interface (Optional) The optional modem Ethernet Data Interface provides four RJ-45 10/100 Base-T interface. The Ethernet interface supports Auto-Crossover and Auto-Sensing. The Ethernet port are referred to as JS1 through JS4. JS1 is Port 1 JS2 is Port 2 JS3 is Port 3 JS4 is Port 4 Refer to Figure 5-1 for outline drawings and Appendix J for setup & configuration.
DMD20/20LBST Universal Satellite Modem 5.13.1 Rear Panel Interfaces 64K AUDIO (J2) The 64K AUDIO Port allows for communications between Earth Stations. It is a 9-Pin Female “D” Connector that complies with IESS 308. Refer to Table 5-15a for pinouts in audio mode and Table 5-15b for pinouts in 64k mode. Table 5-15a. 64K AUDIO (In Audio Mode) Port 9-Pin Female “D” Connector (J2) Pin No.
DMD20/20LBST Universal Satellite Modem 5.13.2 Rear Panel Interfaces 8K DATA (J3) The 8K Data Port allows for communications between earth stations. It is a 15-pin female “D” connector that complies with IESS 308. Table 5-16 gives pinouts. Table 5-16. 8K DATA Port 15-Pin Female “D” Connector (J3) Pin No. 5.13.
DMD20/20LBST Universal Satellite Modem 5.13.4 Rear Panel Interfaces ESC ALARM (J5) The ESC (Engineering Service Circuits) Alarms Port is a 25-Pin Female “D” Connector. Refer to Table 5-18 for pinouts. Table 5-18. ESC ALARM Port 25-Pin Female “D” Connector (J1) 5.13.5 Pin No.
DMD20/20LBST Universal Satellite Modem 5.13.8 Rear Panel Interfaces SD (IDO) (J9) The Send Data (Insert Data Out) Port (Unbalanced) is a 75-Ohm Female BNC Connector. 5.14 HSSI / Ethernet (J1) The HSSI (High-Speed Serial Interface) (J1) complies with the HSSI Functional and Electrical Specifications. The physical interface is a 50-Pin SCSI-2 Type Connector. Electrical levels are ECL. Gapped clocking not supported. The pinouts for this interface are listed in Table 5-19. Table 5-19.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces 5.15 Ethernet Data Interface The optional Ethernet Data Interface provides four RJ-45 10/100 Base-T interface. The Ethernet interface supports Auto-Crossover and Auto-Sensing. The Ethernet port are referred to as JS1 through JS4. JS1 is Port 1 JS2 is Port 2 JS3 is Port 3 JS4 is Port 4 Refer to Figure 5-1 and 5-2 for outline and Appendix J for setup & configuration. See Note 1.
DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces 5.16 GigE Interface The optional Ethernet Data Interface provides a three port RJ45 10/100/1000 Base-T Interface. The Ethernet interface supports Auto-Crossover and Auto-Sensing. The Ethernet port are referred to as JS1 through JS4 or JS1 through JS3. Refer to Figures 5-1 and 5-2 for rear panel configurations. JS1 is Port 1 JS2 is Port 2 JS3 is Port 3 Refer to Figure 5-1 and 5-2 for outline and Appendix J for setup & configuration. See Note 1.
Chapter 6. MAINTENANCE AND TROUBLESHOOTING This section discusses unit maintenance and troubleshooting for the Universal Satellite Modem. WARNING 6.1 The DMD20/DMD20 LBST contains a Lithium Battery. DANGER OF EXPLOSION exists if the battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the manufacturer. Dispose of used batteries in accordance with local and national regulations. Periodic Maintenance There is no external fuse on the modem.
DMD20/20LBST Universal Satellite Modem Symptom The Modem will not acquire the incoming carrier: Maintenance and Troubleshooting Possible Cause There is an improper receive input to modem. The Receive Carrier Level is too low. The Receive Carrier Frequency is outside of the acquisition range. The Transmit Carrier is incompatible. Modem is in Test Mode. The Async Port is not configured correctly. The switches may not be set in the correct positions. 6.2.1 Alarm Faults 6.2.1.
DMD20/20LBST Universal Satellite Modem 6.2.1.2 Maintenance and Troubleshooting Major Rx Alarms Alarm Possible Cause FPGA CFG Indicates a receive FPGA hardware failure. DSP CFG Indicates a receive DSP failure. SIGNAL LOCK Indicates that the demod is unable to lock to a signal. FRAME LOCK Indicates that the Framing Unit is unable to find the expected framing pattern. MULTIFRAME LOCK Indicates that the Framing Unit is unable to find the expected framing pattern.
DMD20/20LBST Universal Satellite Modem 6.2.1.4 Maintenance and Troubleshooting Minor Rx Alarms Alarm Possible Cause BUFF UNDERFLOW Indicates that a Doppler Buffer underflow has occurred. BUFF NEAR EMPTY Indicates that the Doppler Buffer is about to underflow. BUFF NEAR FULL Indicates that the Doppler Buffer is about to overflow. BUFF OVERFLOW Indicates that a Doppler Buffer overflow has occurred. RX DATA ACTIVITY Indicates that there is no Rx Data activity.
DMD20/20LBST Universal Satellite Modem 6.2.1.5 Maintenance and Troubleshooting Drop and Insert Alarms Alarm Possible Cause Multiframe Lock The insert framer is not in sync. CRC Lock An Insert CRC Fault occurred. Valid in T1-ESF, PCM-30, or PCM30C Modes. T1 Signaling An Insert T1 Yellow Fault occurred. Valid in T1-ESF, T1D4, or SCL96 Modes. E1 FAS (E1 Frame Acquisition Sync) An E1 FAS Fault occurred. Valid in PCM-30, or PCM-30C, PCM-31, or PCM-31C Modes.
DMD20/20LBST Universal Satellite Modem Maintenance and Troubleshooting 6.2.2 Alarm Masks The modem performs a high degree of self-monitoring and fault isolation. The alarms for these faults are separated into the following three categories: Active Alarms Common Equipment Alarms Backward Alarms A feature exists that allows the user to ‘Mask’ out certain alarms as explained below. Masking alarms may cause undesirable modem performance .
DMD20/20LBST Universal Satellite Modem 6.2.2.2 Maintenance and Troubleshooting Latched Alarms Latched Alarms are used to catch intermittent failures. If a fault occurs, the fault indication will be latched even if the alarm goes away. After the modem is configured and running, it is recommended that the Latched Alarms be cleared as a final step. 6.2.2.3 Backward Alarms Backward Alarms are alarms that are fed back to or received from the other end of the satellite link.
DMD20/20LBST Universal Satellite Modem Maintenance and Troubleshooting Table 6-1.
Chapter 7. TECHNICAL SPECIFICATIONS 7.1 Data Rates Refer to Section 7.18. 7.
DMD20/20LBST Universal Satellite Modem Technical Specifications LDPC/TPC (Optional) LDPC (BPSK) LDPC (OQPSK/QPSK) LDPC (8PSK/8QAM) LDPC (16QAM) Turbo (BPSK) Turbo (QPSK/OQPSK) Turbo (8QAM/8PSK) Turbo (16QAM) Outer Encoder Options {21/44} {1/2, 2/3, 3/4, 7/8} {2/3, 3/4, 7/8} {3/4, 7/8} Reed-Solomon INTELSAT (DVB Optional, Custom Rates Optional) Internal, External, Rx Recovered -6 -8 1 x 10 Typical (Optional to 5 x 10 ) DMD20 -8 5 x 10 Typical DMD20 LBST Data Clock Source Internal Stability 7.
DMD20/20LBST Universal Satellite Modem Decoder Options Descrambler Acquisition Range Sweep Delay Value 7.4 Reed-Solomon INTELSAT (DVB Optional, Custom Rates Optional) CCITT V.35 or IBS (Others Optional) Programmable ±1 kHz to ± 255 kHz 100 msec to 6000 sec. in 100 msec Steps Plesiochronous Buffer Size Centering Centering Modes Clock 7.
DMD20/20LBST Universal Satellite Modem Technical Specifications 7.10 High-Speed Serial Interface (HSSI) HSSI: HSSI, Serial, 50-Pin SCSI-2 Type Connector (Female) 7.11 ASI ASI/RS-422 Parallel: ASI, Serial, 75-Ohm BNC (Female) DVB/M2P, Parallel, RS-422, DB-25 (Female) ASI/LVDS Parallel: ASI, Serial, 75-Ohm BNC (Female) DVB/M2P, Parallel, LVDS, DB-25 (Female) 7.12 DVB/M2P DVB/M2P: DB-25 Female Connector. It complies with RS-422 Electrical Specifications. 7.
DMD20/20LBST Universal Satellite Modem Technical Specifications 7.17 Environmental Prime Power Operating Temperature Storage Temperature 100 to 240 VAC, 50 to 60 Hz, 40 Watts Maximum 48 VDC (Optional) 0 to 50°C, 95% Humidity, Non-Condensing -20 to 70°C, 99% humidity, Non-Condensing 7.18 Physical Size Weight DMD20 DMD20 LBST 19” W x 16” D x 1.75” H (48.26 x 40.64 x 4.45 cm) 6.5 Pounds (3.0 Kg) 19” W x 19.25” D x 1.75” H (48.26 x 48.89 x 4.45 cm) 8.5 pounds (3.83 kg) 7.
DMD20/20LBST Universal Satellite Modem Technical Specifications Modulation Code Rate Min Data Rate Max Data Rate QPSK SEQ 7/8 8400 2048000 QPSK TPC 1/2 4582 9545454 Supercard QPSK TPC 3/4 7200 15000000 Supercard QPSK TPC 7/8 8400 17500000 Supercard QPSK TPC .495 4752 6312000 Supercard QPSK TPC .
DMD20/20LBST Universal Satellite Modem Technical Specifications Modulation Code Rate Min Data Rate Max Data Rate Option Card 8PSK/8QAM LDPC 3/4 40500 20000000 LDPC/TPC Card 8PSK TPC 3/4 40000 20000000 LDPC/TPC Card 8PSK TPC 7/8 48000 20000000 LDPC/TPC Card 16QAM VIT 3/4 14400 20000000 16QAM VIT 7/8 16840 20000000 16QAM TPC 3/4 1440 20000000 Supercard 16QAM TPC 7/8 16800 20000000 Supercard 16QAM TPC .495 9504 6312000 Supercard 16QAM TPC .
DMD20/20LBST Universal Satellite Modem Technical Specifications 188 Mode Modulation Code Rate Min Data Rate Max Data Rate BPSK VIT 1/2 2400 4607843 BPSK VIT 2/3 2950 6143790 BPSK VIT 3/4 3318 6911764 BPSK VIT 5/6 3687 7679738 BPSK VIT 7/8 3871 8063725 QPSK VIT 1/2 4424 9215686 QPSK VIT 2/3 5899 12287581 QPSK VIT 3/4 6636 13823529 QPSK VIT 5/6 7373 15359477 QPSK VIT 7/8 7742 16127450 8PSK TRE 2/3 8848 18431372 8PSK TRE 5/6 11059 20000000 8PSK TRE 8/9 11
DMD20/20LBST Universal Satellite Modem Technical Specifications 7.20 BER Specifications 7.20.1 BER Performance (Viterbi) 1E-1 B/O/QPSK Uncoded Theory 1E-2 Viterbi Decoder Typical Performance 1E-3 BER 1E-4 1E-5 1E-6 Specification 1/2 Rate 1E-7 Specification 3/4 Rate 1E-8 Specification 7/8 Rate 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 Eb/No in dB Figure 7-1 B/O/QPSK BER Performance (Viterbi) Note: Eb/No values include the effect of using Differential Decoding and V.35 descrambling.
DMD20/20LBST Universal Satellite Modem 7.20.2 Technical Specifications BER Performance (Sequential) 1E-1 B/O/QPSK Uncoded Theory 1E-2 Sequential Decoder Typical Performance 1E-3 BER 1E-4 1E-5 1E-6 Specification 1/2 Rate Specification 3/4 Rate 1E-7 Specification 7/8 Rate 1E-8 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 Eb/No in dB Figure 7-2 B/O/QPSK BER Performance (Sequential) Note: Eb/No values include the effect of using Differential Decoding and V.35 descrambling.
DMD20/20LBST Universal Satellite Modem 7.20.3 Technical Specifications BER Performance (Viterbi with Reed-Solomon) 1E-1 B/O/QPSK Uncoded Theory 1E-2 Viterbi Decoder Reed Solomon Typical Performance 1E-3 BER 1E-4 1E-5 Specification 1/2 Rate 1E-6 Specification 3/4 Rate 1E-7 1E-8 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 Eb/No in dB Figure 7-3 B/O/QPSK BER Performance (Viterbi w/R-S) Note: Eb/No values include the effect of using Differential Decoding.
DMD20/20LBST Universal Satellite Modem 7.20.
DMD20/20LBST Universal Satellite Modem 7.20.5 Technical Specifications BER Performance (B/O/QPSK Turbo) 1E-1 B/O/QPSK Uncoded Theory 1E-2 Turbo Decoder Typical Performance 1E-3 BER 1E-4 1E-5 1E-6 Specification Turbo 0.495 1E-7 Specification Turbo 0.793 1E-8 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 Eb/No in dB Figure 7-5 B/O/QPSK BER Performance (Turbo) Note: Eb/No values include the effect of using interleaving and maximum iterations.
DMD20/20LBST Universal Satellite Modem 7.20.
DMD20/20LBST Universal Satellite Modem 7.20.7 Technical Specifications BER Performance (8PSK Trellis) 1E-1 8PSK Uncoded Theory Trellis Decoder 1E-2 Typical Performance 1E-3 BER 1E-4 1E-5 1E-6 Specification 2/3 Rate 1E-7 Specification 2/3 Rate w/RS 1E-8 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 Eb/No in dB Figure 7-7 8PSK BER Performance (Trellis) Note: Eb/No values include the effect of using Differential Decoding and V.35 Descrambling.
DMD20/20LBST Universal Satellite Modem 7.20.8 Technical Specifications BER Performance (8PSK Turbo) 1E-1 8PSK Uncoded Theory Turbo Decoder 1E-2 Typical Performance 1E-3 BER 1E-4 1E-5 1E-6 1E-7 1E-8 Specification Turbo 0.793 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 Eb/No in dB Figure 7-8 8PSK BER Performance (Turbo) Note: Eb/No values include the effect of using interleaving and maximum iterations.
DMD20/20LBST Universal Satellite Modem 7.20.9 Technical Specifications BER Performance (16QAM Viterbi) 1E-1 16QAM Uncoded Theory Viterbi Decoder 1E-2 Typical Performance 1E-3 BER 1E-4 1E-5 1E-6 Specification 3/4 Rate 1E-7 Specification 7/8 Rate 1E-8 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Eb/No in dB Figure 7-9 16QAM BER Performance (Viterbi) Note: Eb/No values include the effect of using Differential Decoding and V.35 Descrambling.
DMD20/20LBST Universal Satellite Modem 7.20.10 Technical Specifications BER Performance (16QAM Viterbi with Reed-Solomon) 1E-1 16QAM Uncoded Theory Viterbi Decoder Reed Solomon 1E-2 Typical Performance 1E-3 BER 1E-4 1E-5 1E-6 Specification 3/4 Rate w/RS 1E-7 Specification 7/8 Rate w/RS 1E-8 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Eb/No in dB Figure 7-10 BPSK 16QAM BER Performance (Viterbi w/R-S) Note: Eb/No values include the effect of using Differential Decoding.
DMD20/20LBST Universal Satellite Modem 7.20.11 Technical Specifications BER Performance (16QAM Turbo) 1E-1 16QAM Uncoded Theory 1E-2 Turbo Decoder Typical Performance 1E-3 BER 1E-4 1E-5 1E-6 Turbo 0.495 1E-7 Turbo 0.793 1E-8 1E-9 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Eb/No in dB Figure 7-11 BPSK 16QAM BER Performance (Turbo) Note: Eb/No values include the effect of using interleaving and maximum iterations.
DMD20/20LBST Universal Satellite Modem 7.20.
DMD20/20LBST Universal Satellite Modem 7.20.
DMD20/20LBST Universal Satellite Modem 7.20.
DMD20/20LBST Universal Satellite Modem 7.20.
DMD20/20LBST Universal Satellite Modem BER 1E-3 1E-4 1E-5 1E-6 1E-7 1E-8 1E-9 1E-10 Technical Specifications Table 7-1 - B/O/QPSK BER Performance (Viterbi) Specification Typical 1/2 Rate 3/4 Rate 7/8 Rate 1/2 Rate 3/4 Rate 7/8 Rate 4.2 dB 5.3 dB 6.2 dB 3.9 dB 4.9 dB 5.8 dB 4.8 dB 6.1 dB 7.1 dB 4.5 dB 5.6 dB 6.5 dB 5.5 dB 6.8 dB 7.9 dB 5.1 dB 6.3 dB 7.2 dB 7 dB 6.1 dB 7.6 dB 8.6 dB 5.7 dB 7.9 dB 6.7 dB 8.3 dB 9.3 dB 6.2 dB 7.7 dB 8.6 dB 7.4 dB 8.9 dB 10.2 dB 6.8 dB 8.4 dB 9.4 dB 8.2 dB 9.7 dB 11 dB 7.
DMD20/20LBST Universal Satellite Modem Technical Specifications Table 7-4 - B/O/QPSK BER Performance (Turbo) BER Typical Specification Turbo 0.495 Turbo 0.793 Turbo 0.495 Turbo 0.793 1E-3 2.5 dB 3.3 dB 2.2 dB 3 dB 1E-4 2.7 dB 3.7 dB 2.3 dB 3.2 dB 1E-5 3 dB 4.1 dB 2.5 dB 3.4 dB 1E-6 3.2 dB 4.4 dB 2.6 dB 3.6 dB 1E-7 3.5 dB 4.8 dB 2.7 dB 3.8 dB 1E-8 3.7 dB 5.2 dB 2.9 dB 4 dB 1E-9 4 dB 5.6 dB 3 dB 4.2 dB 1E-10 4.2 dB 5.9 dB 3.2 dB 4.
DMD20/20LBST Universal Satellite Modem Technical Specifications Table 7-7 - 16QAM BER Performance (Viterbi) BER Specification Typical 3/4 Rate 7/8 Rate 3/4 Rate 7/8 Rate 1E-3 8.9 dB 10.3 dB 8.1 dB 9.5 dB 1E-4 9.8 dB 11.1 dB 9 dB 10.3 dB 1E-5 10.7 dB 11.9 dB 9.9 dB 11.1 dB 1E-6 11.5 dB 12.7 dB 10.7 dB 11.9 dB 1E-7 12.4 dB 13.5 dB 11.6 dB 12.7 dB 1E-8 13.3 dB 14.3 dB 12.5 dB 13.5 dB 1E-9 14.2 dB 15.1 dB 13.4 dB 14.3 dB 1E-10 15 dB 15.9 dB 14.2 dB 15.
DMD20/20LBST Universal Satellite Modem BER 1E-3 1E-4 1E-5 1E-6 1E-7 1E-8 Technical Specifications Table 7-10 - (O)QPSK BER Performance (Turbo) Specification Typical Turbo 1/2 Turbo 3/4 Turbo 7/8 Turbo 1/2 Turbo 3/4 Turbo 7/8 TBD 3.2 dB 4 dB TBD 2.8 dB 3.7 dB TBD 3.4 dB 4.1 dB TBD 3 dB 3.8 dB 2.7 dB 3.6 dB 4.2 dB 2.4 dB 3.2 dB 3.9 dB 2.9 dB 3.8 dB 4.3 dB 2.6 dB 3.4 dB 4 dB 3.1 dB 4.1 dB 4.4 dB 2.8 dB 3.7 dB 4.1 dB 3.3 dB 4.4 dB 4.5 dB 3 dB 4 dB 4.
DMD20/20LBST Universal Satellite Modem BER 1E-5 1E-9 Technical Specifications Table 7-14 - 8PSK / 8-QAM Rate BER Performance (LDPC) 8PSK 8-QAM Specification Typical Specification Typical 2/3 Rate 3/4 Rate 2/3 Rate 3/4 Rate 2/3 Rate 3/4 Rate 2/3 Rate 3/4 Rate 5.6 dB 5.2 dB 4.6 dB 5.6 dB 4.2 dB 5.2 dB 5.7 dB 6 dB 5.3 dB 5.6 dB 5 dB 6 dB 4.6 dB 5.6 dB Table 7-15 - 16QAM BER Performance (LDPC) Specification Typical BER 3/4 Rate 3/4 Rate 1E-5 6.8 dB 6.2 dB 1E-9 7.1 dB 6.8 dB Table 7-16.
DMD20/20LBST Universal Satellite Modem Technical Specifications Figure 7-16 AGC Voltage Monitor MN-DMD20-20LBST Revision 14 7–29
DMD20/20LBST Universal Satellite Modem Technical Specifications BLANK PAGE MN-DMD20-20LBST Revision 14 7–30
Appendix A. Product Options A.1 Hardware Options The following enhanced interface cards are available. A.2 G.703/IDR ESC Interface The modem can be equipped with G.703 T1/E1/T2/E2 /IDR ESC Interface A.3 Internal High Stability The modem can be equipped with a 5x10-8 or better Stability Frequency Reference as an add-on enhancement. This is a factory upgrade only. A.4 DC Input Prime Power Allows for an optional DC Input Power Source. A.
DMD20/20LBST Universal Satellite Modem A.9 Product Options Gigi Ethernet Data Interface Three RJ-45, Auto-Crossover, Auto-Sensing, 10/100/1000 Ethernet Data Ports. Complies with IEEE 802.3 and IEEE 802.3u. A.10 HSSI / G.703 High-Speed Serial Interface 50-Pin SCSI-2 Type Connector. Complies with Cisco Systems in HSSI Design Specification, Revision 3.0. The G.703 interface supports T1, E1, T2, E2 rates balanced or unbalanced. It does not support backward alarms. A.
Appendix B. Front Panel Upgrade Procedure B.1 Introduction The Universal Satellite Modem offers the ability to perform field upgrades of the modem’s feature set quickly and easily from the front panel. Purchased upgrades will become part of the modems permanent configuration. Demonstration upgrades will enable the optional features for a 30-day evaluation period. B.2 Required Equipment The Universal Satellite Modem is the only equipment required for this procedure. B.
DMD20/20LBST Universal Satellite Modem Front Panel Upgrade Procedure KEY CODE REQ indicates that the desired option is available as a front panel upgrade. 2. Contact Comtech with the Unit ID and Desired Upgrades. The modem’s Unit ID can be found on the front panel as follows: a. b. c. d. e. f. From the modem’s Main Menu, scroll right to the SYSTEM Menu. Scroll down. Scroll right to the HW/FW CONFIG Menu. Scroll down. Scroll right to the FEATURES Menu.
DMD20/20LBST Universal Satellite Modem B.4 Front Panel Upgrade Procedure Demonstration Procedure The procedure for enabling a 30-day demo of the options is similar to the procedure used for permanently updating the modems feature set. The one big difference being that at the end of 30 days, the demo features will automatically be disabled and the modem will revert back to its permanent configuration.
DMD20/20LBST Universal Satellite Modem 2. Front Panel Upgrade Procedure Contact Comtech with the Unit ID and Request a Demonstration. The modem’s Unit ID can be found on the front panel as follows: a. b. c. d. e. f. From the modem’s Main Menu, scroll right to the SYSTEM Menu. Scroll down. Scroll right to the HW/FW CONFIG Menu. Scroll down. Scroll right to the FEATURES Menu. Scroll down. The value displayed on the top line of this menu is the 12-digit Unit ID.
DMD20/20LBST Universal Satellite Modem Front Panel Upgrade Procedure B.4.1 Running in Demonstration Mode Because of the possible interruption in traffic when the demonstration mode expires, several indicators are used to inform an operator that the modem is indeed, operating in demonstration mode. The most obvious of these is that the remote LED is flashing. A second indication can be found on the Features Menu as follows: 1. 2. 3. 4. 5. From the modem’s Main Menu, scroll right to the SYSTEM Menu.
DMD20/20LBST Universal Satellite Modem Front Panel Upgrade Procedure B.4.2 Canceling Demonstration Mode At any time, a demonstration may be canceled and have the modem return to its normal operation. Once the demonstration has been canceled, it cannot be restarted using the old demonstration code. In order to restart a demonstration, it will be necessary to obtain a new demonstration code. To cancel a demonstration from the front panel, perform the following: 1. 2. 3. 4. 5. 6.
Appendix C. Carrier Control C.1 States The transmitter will turn off the carrier output automatically when the modem determines there is a major alarm. This is done to prevent the carrier from outputting an unknown spectrum and possibly disturbing adjacent carriers. This automatic drop of the carrier can be overridden by masking the alarm that is causing the fault. This will keep the modulator output spectrum transmitting, even when the fault occurs.
DMD20/20LBST Universal Satellite Modem C.5 Carrier Controls Carrier VSat Modulator output is turned off before reprogramming modulator functions that may alter the output spectrum through the front panel, and the user is required to enter “Yes” to re-enable output after the change.
Appendix D. Strap Codes D.1 Strap Codes The Strap Code is a quick set key that sets many of the modem parameters. For quick setup of the modem, Strap Codes are very helpful. When a Strap Code is entered, the modem is automatically configured for the code’s corresponding data rate, overhead, code rate, framing, scrambler type and modulation. An example of how to set a strap code follows: Example: At the Front Panel Menu, depress ‘↓’, then move ‘→’ to the ‘Strap Code’ Submenu and enter #16.
DMD20/20LBST Universal Satellite Modem Strap Codes 1 1/2 VIT Mode 56 Modulation 24 Reed-Solomon 3/4 Drop and Insert Code Rate 96K Scrambler Type Overhead 8448 Framing Type Data Rate (Kbps) 128 Type Strap Code (Decimal) Table D-1. Strap Codes Dis = Disable VIT IDR V.35 (IESS) Dis Dis QPSK IDR NONE V.35 (IESS) Dis Dis QPSK CNT V.35 (IESS) Dis Dis QPSK CNT 33 56 1 3/4 VIT NONE 34 64 1 1/2 VIT NONE V.
DMD20/20LBST Universal Satellite Modem Strap Codes Strap Code (Decimal) Data Rate (Kbps) Overhead Code Rate Type Framing Type Scrambler Type Drop and Insert Reed-Solomon Modulation Mode Table D-1. Strap Codes Dis = Disable 52 1920 16/15 3/4 VIT IBS IBS Dis Dis QPSK IBS 69 6312 1 3/4 VIT NONE V.35 (IESS) Dis Dis QPSK CNT 70 8448 1 3/4 VIT NONE V.35 (IESS) Dis Dis QPSK CNT 73 3152 1 1/2 VIT NONE V.
DMD20/20LBST Universal Satellite Modem Strap Codes Strap Code (Decimal) Data Rate (Kbps) Overhead Code Rate Type Framing Type Scrambler Type Drop and Insert Reed-Solomon Modulation Mode Table D-1.
DMD20/20LBST Universal Satellite Modem Strap Codes Strap Code (Decimal) Data Rate (Kbps) Overhead Code Rate Type Framing Type Scrambler Type Drop and Insert Reed-Solomon Modulation Mode Table D-1. Strap Codes Dis = Disable 176 4000 1 1/2 VIT NONE V.35 (IESS) Dis Dis QPSK CNT 116 4000 1 3/4 VIT NONE V.35 (IESS) Dis Dis QPSK CNT 60 1344 16/15 3/4 VIT IBS IBS Dis Dis QPSK CNT D.
DMD20/20LBST Universal Satellite Modem Strap Codes D.2.1 Operational Case Examples IMPORTANT For best results always begin setup by setting the data rate to 512 Kbps. This data rate is applicable for all modes and as such provides a convenient launch point for setting up the modem. Any mode of operation can be entered from this starting point. Case 1: IDR 8.
DMD20/20LBST Universal Satellite Modem Strap Codes Demodulator: Method 1 Under Interface Menu: Set mode to IDR Under Demod IF Menu: Under Demod data Menu: Method 2 Under Interface Menu: Set Interface type Set Demod strap code to 128 Set Interface type Set Buff clock selection Set Buffer Size Set desired Rx frequency Set code rate to 3/4 VIT Set data rate for 8448000 Set Buff clock selection Set Buffer Size Under Demod IF Menu, set desired Rx frequency Case 2: IBS 1.
DMD20/20LBST Universal Satellite Modem Strap Codes Demodulator: Method 1 Under Interface Menu: Set Framing to 1/15: Set mode to IBS: Under Demod IF Menu: Under Demod Data Menu: Set code rate to 3/4 VIT Under Interface Menu: Method 2 Under Interface Menu: Set Demod strap code to: 120 Under Demod IF Menu: Set Interface type Set Buff clock selection Set Buffer Size Set desired Rx frequency Set data rate for 1544000 Set Interface type Set Buff clock selection Set Buffer Size Set Interface type Set Buff c
DMD20/20LBST Universal Satellite Modem Strap Codes Demodulator: Method 1 Under Interface Menu: Set Interface type Set Buff clock selection Set Buffer Size Set mode to: Closed Net Under Demod IF Menu: Set desired Rx frequency Under Demod data Menu: Set code rate to 3/4 VIT Set Framing for 1/15 Method 2 Under Interface Menu: Set Demod strap code to: 101 Set Interface type Set Buff clock selection Set Buffer Size Under Demod IF Menu: Set desired Rx frequency Case 4: Loop Timing Example Method 1 Under In
DMD20/20LBST Universal Satellite Modem Strap Codes BLANK PAGE MN-DMD20-20LBST Revision 14 D–10
Appendix E.TCP/IP Ethernet Setup E.1 Introduction The modem supports SNMP, FTP protocols and the Web Browser. Utilization of the protocols is dependent upon proper set up of the TCP-IP menus. This document is to be used only as a guideline for setting up the TCP-IP menus. Contact the IT manager for proper guidance to ensure setup is successful. For additional information on the various WEB or SNMP configurations and descriptions refer to the Remote Protocol Manual (MN-DMDREMOTEOP). E.
DMD20/20LBST Universal Satellite Modem TCP/IP Ethernet Setup d. IP TEST: The IP Test selection is similar in behavior to the Default selection. When enabled, the following preset parameters will be programmed and will not change until the selection is changed. To edit these parameters, change the boot mode to NON-VOL. IMPORTANT IP MASK MODEM IP ADDR SERVER IP ADDR ROUTER IP ADDR 255.255.255.000 192.168.000.238 192.168.000.101 192.168.000.
DMD20/20LBST Universal Satellite Modem E.3 TCP/IP Ethernet Setup Network Configuration Summary If the above steps were followed and the information was entered, then the following would be the TCP / IP configuration summary for a ‘no router specified’ setup: 1. 2. 3. 4. 5. 6. 7. 8. 9. E.4 Boot Mode = Bootp Server Tag = Modem Host= IP Address Mask = Modem IP Address = Server IP Address = Router IP Address = Modem Ethernet Address= Ethernet Rate = NON-VOL 206 DMDXX 255.255.0.0 172.18.100.215 172.18.4.
DMD20/20LBST Universal Satellite Modem TCP/IP Ethernet Setup The Computer TCP/IP must be properly configured in order to obtain connectivity. The following set-up procedure can be used as a guide to aide in this setup. The following instructions apply only to Windows 2000 or XP Classic. 1. 2. Click on the Start Button. Select Settings and click on the Control Panel Icon. Double click the Network Connections Icon. Select the Local Area Connection icon for the applicable Ethernet adapter.
DMD20/20LBST Universal Satellite Modem TCP/IP Ethernet Setup complete the PC Configuration. Note: some computers may require that the computer be restarted for the changes to take effect. Internet Protocol (TCP/IP) Properties Box 5. To reconnect the computer to a network, select the “Obtain an IP address automatically” selection in the screen shown above.
DMD20/20LBST Universal Satellite Modem TCP/IP Ethernet Setup E.4.3 Testing the Ethernet connection using the Ping Program (Optional) Use the Ping command to report if the Host (Equipment) is correctly responding. Open the MSDOS Command Prompt and give a Ping command as shown in the following example. 1. Open MSDOS Command Prompt. The Screen will display: Microsoft Windows XP [Version 5.1.2600] (C) Copyright 1985-2001 Microsoft Corp. 2. At the Command Prompt Enter “ping 172.18.100.
Appendix F. WEB INTERFACE SETUP GUIDE F.1 Introduction The web interface lets Radyne products connect and communicate through the Ethernet port. The connection is a 10Base-T Ethernet connection. You use the web interface to control and monitor the parameters and functions of these connected units. To find out if the unit has the Web interface, use the front panel control screen and make sure that you can see the WEB submenu. If you do not see the WEB submenu, contact customer service for help.
DMD20/20LBST Universal Satellite Modem Web Browser Setup Guide F.2.2 IP Address IMPORTANT Before you set an IP address, contact the IT authority in your organization for help. The BOOT MODE setting controls access to the IP address for the unit. The unit is shipped from the factory with the BOOT MODE set to DEFAULT (a fixed address that is not accessible). To access the unit through the Ethernet port, set the Boot Mode to IP TEST (a fixed IP address that is accessible).
DMD20/20LBST Universal Satellite Modem Web Browser Setup Guide F.3.2 User Account Data IMPORTANT All entries are case-sensitive. Parameter Character type Maximum Minimum Restrictions User ID ASCII Printable Characters 13 0 None Authentication Password ASCII Printable Characters 13 0 None Web User ASCII Printable Characters 13 0 [CEFD1]None Access Group Access Level Description GUEST View Only Guests see most of the site and modem parameter settings.
DMD20/20LBST Universal Satellite Modem Web Browser Setup Guide IMPORTANT All entries are case-sensitive. To set up a User Account, do these steps: 1. Edit the User ID. 2. Edit the Access Group. 3. Edit the Authentication Password. F.1.1 Edit the User ID. 1. Select the User ID. 2. Press ENTER. 3. Move the cursor to the first character. 4. Press CLEAR and theright button to delete the characters. 5. Use the direction buttons and numeric keys to enter the new User ID. 6. Press ENTER to save the change. F.
DMD20/20LBST Universal Satellite Modem Web Browser Setup Guide F.2 Reset a User Account Sometimes, it is necessary to reset a user account to the factory defaults. For example, a user account may be locked because of too many incorrect password attempts. Release the lock by resetting the user account. Then, set up the user account again. To reset a User Account, do these steps: 1. Select the User ID. 2. Press the down button. 3. Press theright button until you see USER RESET. 4.
DMD20/20LBST Universal Satellite Modem Web Browser Setup Guide F.4 Equipment Website Once you know that the modem is accessible through the internet, do these steps: 1. Start the internet browser. 2. Type the modem’s IP address in the address field, and then press [Enter]. The WEB browser equipment introduction page opens. Figure F-1.
DMD20/20LBST Universal Satellite Modem Web Browser Setup Guide The Introduction page shows general information, such as: • Type of equipment • Equipment features and capabilities overview • Hardware and software options that are available Other links are available on the Introduction page: • Links to the PDF files that contain technical specifications and product options • Links to the Comtech EF Data website and customer service pages F.4.
DMD20/20LBST Universal Satellite Modem Web Browser Setup Guide F.5 Web Page Appearance This page displays the Monitor and Control section of the modem web interface. The page has an appearance that resembles the DMD2050E layout. The front panel display section of the page shows the current front panel alarm status of the modem. This display is updated immediately any time the status changes. Figure F-3. Monitor and Control Web Page The navigation tabs correspond to the front panel top-level menus.
DMD20/20LBST Universal Satellite Modem Web Browser Setup Guide F.6 Configure Web Browsers for the Radyne WEB Interface F.6.1 Configure Internet Explorer 9 for the Radyne WEB Interface Click the Compatibility View button on the address bar. When Compatibility View is active, the color of the button is blue. If Compatibility View is active, the Monitor & Control window should be displayed correctly. F.6.
DMD20/20LBST Universal Satellite Modem F.6.2.1 Web Browser Setup Guide Change the encoding: Click View on the Firefox menu bar. Select Character Encoding and click Western (ISO-8859-1). The page refreshes and shows the correct values.
DMD20/20LBST Universal Satellite Modem F.6.2.2 Web Browser Setup Guide Install the Internet Explorer Tab V2 add-on The Internet Explorer (IE) Tab V2 add-on lets you open WEB browser pages in Internet Explorer 7 mode. The link to the add-on is https://addons.mozilla.org/en-US/firefox/addon/ie-tab2-ff-36/ Download and install IE Tab V2. After IE Tab V2 is installed, Firefox restarts. Go to Tools / IE Tab 2 Options and add the Radyne product IP address to the Sites Filter. In this example, Address 192.
DMD20/20LBST Universal Satellite Modem Web Browser Setup Guide F.6.3 Configure Chrome for the Radyne WEB Browser When you open the Monitor & Control window, you may see the error message “This webpage is not available”. Click the Chrome address bar. Make sure the full address is highlighted, and then press Enter. The Monitor & Control window opens. On the Monitor & Control, Password Setup or IP Administration windows, some fields may be blank or contain Update.
DMD20/20LBST Universal Satellite Modem F.6.3.1 Web Browser Setup Guide Change the encoding On the Chrome address bar, click the wrench icon (Customize and Control Google Chrome). Go to Tools / Encoding and click Western (ISO-8859-1). The page refreshes and shows the correct values.
DMD20/20LBST Universal Satellite Modem F.6.3.2 Web Browser Setup Guide Install the Internet Explorer Tab for Chrome The Internet Explorer (IE) Tab lets you open WEB browser pages in Internet Explorer 7 mode. The link to install IE Tab is: https://chrome.google.com/webstore/search/IE%20Tab?utm_source=chrome-ntp-icon To install IE Tab, click + ADD TO CHROME next to IE Tab. After IE Tab is installed, the IE Tab icon shows in the address bar. To use IE Tab, click the icon.
DMD20/20LBST Universal Satellite Modem Web Browser Setup Guide F.6.4 Configure Safari for the Radyne WEB Browser IMPORTANT First, make sure to empty the browser cache. F.6.4.1 Empty the browser cache On the Safari menu bar, click Edit and then click Empty Cache... Click [Empty] on the confirmation popup window. After the browser cache is empty, open the Monitor & Control page. CAUTION If you do not empty the browser cache before you open the Monitor & Control page, communication can be lost.
DMD20/20LBST Universal Satellite Modem F.6.4.2 Web Browser Setup Guide Reset the Ethernet M&C port To reset the Ethernet M&C port, either 1) cycle the electrical power OFF and ON, or, 2) re-enter the Modem IP Address. Re-entering the Modem IP Address avoids traffic disruption. F.6.4.3 Re-enter the Modem IP address 1. Go to SYSTEM / TCP/IP / MODEM IP ADDR. 2. Press ENTER. 3. Type the new IP Address and press ENTER. 4. Press ENTER again. 5. Retype the new IP Address and press ENTER.
DMD20/20LBST Universal Satellite Modem Web Browser Setup Guide On the Monitor & Control, Password Setup or IP Administration windows, some fields may be blank or contain Update. To correct the display, change the encoding. NOTE If you leave a window and return, it may be necessary to correct the display again.
DMD20/20LBST Universal Satellite Modem F.6.4.4 Web Browser Setup Guide Change the encoding Click View on the Safari menu bar. Select Text Encoding and click Western European. (The Default selection is not applicable.) The page refreshes and shows the correct values.
DMD20/20LBST Universal Satellite Modem Web Browser Setup Guide F.6.5 Configure Maxthon for the Radyne WEB Browser On the Monitor & Control, Password Setup or IP Administration windows, some fields may be blank or contain Update. To correct the display, either 1) change the browser mode, or, 2) change the encoding. NOTE If you leave a window and return, it may be necessary to correct the display again.
DMD20/20LBST Universal Satellite Modem F.6.5.1 Web Browser Setup Guide Change the browser mode Two browser modes are possible: Ultra Mode (default) Retro Mode Click the browser mode icon at the right of the address bar. Select Retro Mode MN-DMD20-20LBST Revision 14 . The page refreshes and shows the correct values.
DMD20/20LBST Universal Satellite Modem F.6.5.2 Web Browser Setup Guide Change the encoding On the Monitor & Control page, right click to open the browser menu. Select Encoding, and then click the encoding type that is already selected. The page refreshes and shows the correct values.
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Appendix G. AUPC Operation G.1 Automatic Uplink Power Control (AUPC Operation) The modem has an optional built-in provision for Automatic Uplink Power Control, AUPC. AUPC is useful when operating power levels are affected by environmental changes in the atmosphere. AUPC attempts to adjust local power output to maintain a constant Eb/No at the receiver location. The modem supports three versions of AUPC. They include Radyne AUPC, EF AUPC and Near Side AUPC.
DMD20/20LBST Universal Satellite Modem AUPC Operation G.1.2 EF AUPC In EF AUPC mode, the Target Eb/No indicates the local unit wants the remote unit to maintain a power level sufficient to provide the local Eb/No value. EF AUPC can be set to operate on either or both directions of a link but always require a bidirectional channel. Enabling AUPC on one side of the link will activate AUPC on the distant end of the link.
DMD20/20LBST Universal Satellite Modem AUPC Operation The AUPC Menu Functions and their descriptions are shown on Table G-1 and G-2. Table G-1.
DMD20/20LBST Universal Satellite Modem AUPC Operation BLANK PAGE MN-DMD20-20LBST Revision 14 G–4
Appendix H. Drop and Insert (D&I) H.1 Drop and Insert (D&I) The Drop and Insert (D&I) function provides an interface between a full T1 or E1 Trunk whose framing is specified in CCITT G.704 and a fractional Nx64 Kbps Satellite Channel. The Drop and Insert functionality conforms to IBS, small IDR, and Radyne Proprietary Efficient D&I Framing Structures. For information pertaining to Radyne proprietary Efficient Drop and Insert function, refer to Appendix I.
DMD20/20LBST Universal Satellite Modem Drop and Insert (D&I) Figure H-1 Looped Modems Figure H-2 Looped Modems with Separate D&I Trunks MN-DMD20-20LBST Revision 14 H–2
DMD20/20LBST Universal Satellite Modem Drop and Insert (D&I) H.1.1 Drop Only When Drop is enabled and Insert is disabled, the unit performs a drop-only function. Framed E1 or T1 Data is input via the Send Data In Port, the selected timeslots are dropped into the IBS frame structure, and the unaltered terrestrial data is output via the Send Data Out Port (refer to Figure H-3). Figure H-3 Drop Only H.1.2 Insert Only When Insert is enabled and Drop is disabled, the unit performs an insert-only function.
DMD20/20LBST Universal Satellite Modem Drop and Insert (D&I) H.1.3 Mode Selection D&I can be easily configured to support several commonly used terrestrial data formats. For E1 Data, the user can choose between PCM-30, PCM-30C, PCM-31 and PCM-31C. For T1 Data, the user can choose between T1-D4, T1-ESF, and SLC-96. The following paragraphs provide more information on the various mode selection capabilities. H.1.3.
DMD20/20LBST Universal Satellite Modem H.1.3.5 Drop and Insert (D&I) T1-D4/T1-D4-S The T1-D4 Mode of Operation supports a T1 Interface with 12 frames per multiframe. The user may independently program n timeslots to drop and n timeslots to insert where n = 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, or 30. Robbed Bit Signaling (RBS) is handled without any need for operator intervention and is transparent to the user. H.1.3.
DMD20/20LBST Universal Satellite Modem Drop and Insert (D&I) H.1.5 Drop and Insert Mapping The following displays under Interface D&I Setup (both Tx and Rx), are editing displays only: SATCh TS Enter to Edit Any changes made in these displays are made on the screen, but are not entered into the modem. Once these menus are configured, the Mapping Menu must be used to actually enter the settings into the modem.
DMD20/20LBST Universal Satellite Modem Drop and Insert (D&I) 4. Use the Up or Down Arrow Key to until the right hand portion displays “TX ACTIVE”. 5. The mapping display should now look like this: Map Copy TX EDIT > TX ACTIVE 6. Push to enter this command. This tells the modem to configure to the settings that were assigned in the Channel/Timeslot display. For the Receive Side: 1. With Rx Side Channels configured as follows: CH1 to TS1, CH2 to TS2, CH3 to TS3, and CH4 to TS4. 2.
DMD20/20LBST Universal Satellite Modem H.2 Drop and Insert (D&I) Configuring the Modem for Drop and Insert Several dependencies exist when configuring the modem for Drop and Insert (D&I). The following paragraphs explain these dependencies and provide the user with the information required to ensure smooth transition into D&I and to minimize the potential impact of these dependencies. H.2.
DMD20/20LBST Universal Satellite Modem Drop and Insert (D&I) H.2.2 Operational Network Specification The Network Specification of the Modem often determines which additional menus and displays are available for use. The D&I Mode-specific menus are not displayed unless the Network Specification of the modem is set to D&I. Therefore, the second step in configuring the modem should be to set the Network Specification to D&I.
DMD20/20LBST Universal Satellite Modem Drop and Insert (D&I) H.2.4 D&I Sample Configurations and D&I Clock Setup Options The following are several examples of how to configure the modem for D&I. Also, refer to Figures 3-14 through 3-17 for the D&I Clocking Setup Options Available.
DMD20/20LBST Universal Satellite Modem Drop and Insert (D&I) Under Demodulator: Set Network Spec. = Drop & Insert Example 2: Multidestinational Remote Site Programming Drop 512 Kbps from a T1 trunk, 3/4 Rate Viterbi. Extract 512 Kbps from a 1536 Kbps carrier and insert into a T1 trunk, 3/4 Rate Viterbi. Drop 512 Kbps from a T1 trunk, 3/4 Rate Viterbi Configuration setup is exactly as previously shown in Example 1.
DMD20/20LBST Universal Satellite Modem Drop and Insert (D&I) Figure H-8 Single Truck Figure H-9 Rx Only With Trunk Figure H-10 Rx Only No Trunk MN-DMD20-20LBST Revision 14 H–12
DMD20/20LBST Universal Satellite Modem H.3 Drop and Insert (D&I) D&I Maps and Map Editing The Drop and Insert multiplexer is programmed by loading it with a transmit and receive map. Maps always contain 30 entries, although, only the first “n” entries are relevant (see Table 4-5). The modem includes provisions to copy, change, and store the D&I transmit and receive maps directly from the Front Panel or via the remote M&C link. These maps are tables that are used to define and configure the D&I functions.
DMD20/20LBST Universal Satellite Modem Drop and Insert (D&I) ROM Map Table H-2.
DMD20/20LBST Universal Satellite Modem Drop and Insert (D&I) ROM Map 2 could be used as the template for an Active Receive (Insert) Map within a demodulator configured for 128 Kbps operation. The demodulated data in the receive path would be inserted into the first two time slots of the T1 or E1 frame. The Insert Multiplexer would know to look only at the first two entries in the Active Receive table and would ignore the other 28 entries.
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Appendix I. Efficient Drop and Insert (D&I) I.1 Introduction The menu structure and procedure to configure a modem for Efficient Drop & Insert Mode follow. I.2 Prerequisite To be configured for Efficient Drop & Insert, the modem must have a G.703 Interface card installed and Drop & Insert option must be enabled. If the modem does not have the required hardware and/or feature set enabled, contact Comtech to order the appropriate hardware and/or feature set upgrade.
DMD20/20LBST Universal Satellite Modem I.3 Efficient Drop & Insert Efficient Drop & Insert Mode With Efficient Drop & Insert, the terrestrial interface selections, terrestrial framing modes, terrestrial to satellite mapping, ES to ES channel, satellite and terrestrial backward alarm functionality, and the In Station Prompt and Deferred Service alarm operation are identical to that of the Drop & Insert Open Network standard.
DMD20/20LBST Universal Satellite Modem Efficient Drop & Insert I.3.1 Calculating the Required Satellite Bandwidth In order to calculate the satellite bandwidth (i.e. the symbol rate), we must first calculate the Efficient D&I Rate (i.e. the data rate plus the overhead required for Efficient Drop & Insert). From there, the calculation of the required satellite bandwidth is identical to all other modes of operation and simply takes into account modulation type and forward error correction.
DMD20/20LBST Universal Satellite Modem I.3.4.
DMD20/20LBST Universal Satellite Modem Efficient Drop & Insert Example 2a: 10 Drop Slots with T1-D4 framing, standard ES to ES overhead For 10 Drop Slots, the Data Rate would be 10 * 64000 or 640000 bps The Efficient D&I Rate would be 640000 + (10 * 250) bps = 642500 bps The Drop & Insert Open Network rate is over 40,000 bps higher at 682667 bps.
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Appendix J. Ethernet Data Interface Setup J.1 Configure the modem to use the Ethernet Data Interface (Optional) When the optional 10/100 or 10/100/1000 Base-T Ethernet Data Interface Card is installed, all of the Ethernet related menus become available and can be used to control the interface as follows: Under the Interface Menu: Under the Tx Setup Menu: Set the Terrestrial Interface to Ethernet. Set the Ethernet Flow Control as desired (refer to Section 4.8.1 for details).
DMD20/20LBST Universal Satellite Modem J.1.1.1 Ethernet Data Interface Setup Half-Duplex Flow Control In half-duplex mode, the unit uses industry standard backpressure to support flow control as follows: When available buffer space is almost gone, the modem will force a collision on the input port when it senses an incoming packet. This collision will cause the transmitting station to back off and retry the transmission.
DMD20/20LBST Universal Satellite Modem Ethernet Data Interface Setup When Strict Priority is selected, the interface transmits packets from the highest priority queue until it is empty. It then begins transmitting data from the next highest priority queue. If higher priority data arrives, the interface finishes the current packet and then goes back to transmitting packets from the higher priority queue until it is again empty.
DMD20/20LBST Universal Satellite Modem Ethernet Data Interface Setup J.1.6 Packet Statistics The following statistics are available under the Monitor Menu when the Ethernet Data Interface is selected. Total Packets: This Counter displays the total number of Ethernet packets received from the satellite. Error Packets: This counter displays the total number of Ethernet packets received from the satellite that had errors.
METRIC CONVERSIONS Units of Length Unit Millimeter Centimeter Inch Foot Yard Meter Kilometer Mile 1 millimeter 1 0.1 0.0394 0.0033 0.0011 0.001 1 x 10-6 6.214 x 10-7 1 centimeter 10 1 0.3937 0.0328 0.0109 0.01 1 x 10-5 6.214 x 10-6 1 inch 25.4 2.54 1 0.0833 0.0278 0.0254 2.54 x 10-5 1.578 x 10-5 1 foot 304.8 30.48 12 1 0.3333 0.3048 3.048 x 10-4 1.894 x 10-4 1 yard 914.4 91.44 36 3 1 0.9144 9.144 x 10-4 5.682 x 10-4 1 meter 1000 100 39.37 3.2808 1.
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