Installation and Operation Manual ASM-20 Synchronous/Asynchronous Short Range Modem
ASM-20 Synchronous/Asynchronous Short Range Modem Installation and Operation Manual Notice This manual contains information that is proprietary to RAD Data Communications Ltd. ("RAD"). No part of this publication may be reproduced in any form whatsoever without prior written approval by RAD Data Communications.
Limited Warranty RAD warrants to DISTRIBUTOR that the hardware in the ASM-20 to be delivered hereunder shall be free of defects in material and workmanship under normal use and service for a period of twelve (12) months following the date of shipment to DISTRIBUTOR.
General Safety Instructions The following instructions serve as a general guide for the safe installation and operation of telecommunications products. Additional instructions, if applicable, are included inside the manual. Safety Symbols Warning This symbol may appear on the equipment or in the text. It indicates potential safety hazards regarding product operation or maintenance to operator or service personnel.
Handling Energized Products General Safety Practices Do not touch or tamper with the power supply when the power cord is connected. Line voltages may be present inside certain products even when the power switch (if installed) is in the OFF position or a fuse is blown. For DC-powered products, although the voltages levels are usually not hazardous, energy hazards may still exist.
Connection of Data and Telecommunications Cables Data and telecommunication interfaces are classified according to their safety status. The following table lists the status of several standard interfaces. If the status of a given port differs from the standard one, a notice will be given in the manual. Ports Safety Status V.11, V.28, V.35, V.36, RS-530, X.
Caution Attention To reduce the risk of fire, use only No. 26 AWG or larger telecommunication line cords. Pour réduire les risques s’incendie, utiliser seulement des conducteurs de télécommunications 26 AWG ou de section supérieure. Some ports are suitable for connection to intra-building or non-exposed wiring or cabling only. In such cases, a notice will be given in the installation instructions. Do not attempt to tamper with any carrier-provided equipment or connection hardware.
Canadian Emission Requirements This Class A digital apparatus meets all the requirements of the Canadian Interference-Causing Equipment Regulation. Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada. Warning per EN 55022 (CISPR-22) Warning This is a class A product. In a domestic environment, this product may cause radio interference, in which case the user will be required to take adequate measures.
Declaration of Conformity Manufacturer's Name: RAD Data Communications Ltd. Manufacturer's Address: 24 Raoul Wallenberg St. Tel Aviv 69719 Israel declares that the product: ASM-20 Product Name: conforms to the following standard(s) or other normative document(s): EMC: Safety: EN 55022: 1998 Information technology equipment, radio disturbance characteristics, limits and methods of measurement.
Quick Start Guide If you are familiar with ASM-20, use this guide to prepare it for operation. Perform the following steps for both the local and the remote units. 1. Disconnect all cables from the units. 2. Open the units. Note 3. Adjust the jumpers. See Chapter 2, Installation and Setup. Make sure that there is only one clock source in the application: one modem INT or EXT and the other modem RCV (LBT). 4. Configure the DTE parameters. See Chapter 2, Installation and Setup. 5.
Quick Start Guide 2 ASM-20 Installation and Operation Manual
Contents Chapter 1. Introduction 1.1 Overview..................................................................................................................... 1-1 Applications.......................................................................................................................... 1-1 Features................................................................................................................................ 1-2 Options .........................................................
Table of Contents 4.3 Modem Self Test.......................................................................................................... 4-3 4.4 Local Test - Analog Loopback ...................................................................................... 4-3 4.5 Communication Link Tests........................................................................................... 4-4 Remote Digital Loopback............................................................................................
Chapter 1 Introduction 1.1 Overview The ASM-20 short range modem operates synchronously or asynchronously at full-or half-duplex, over unconditioned lines. ASM-20 has a range of up to 23 km (14 mi) and operates at selectable data rates from 19.2 kbps to 256 kbps. ASM-20 uses conditioned diphase modulation (EUROCOM Std. D1) to provide immunity from background noise, eliminate normal line distortion, and enable efficient transmission and reception of serial data over a twisted pair cable.
ASM-20 Installation and Operation Manual Chapter 1 Introduction RAD ASM-20 RCV CLK G.703 DIGITAL SERVICE NETWORK RAD DTE RAD ASM-20 EXT CLK ASM-20 EXT CLK RAD ASM-20 RCV CLK Terminal Figure 1-2. G.703 Modem Link Application RAD RAD ASM-20 G.703 or X.21/RS-530/V.24 or V.35 or ETH ASM-20 DTE Figure 1-3. Tail-end for Digital Network Application Features ASM-20 features V.54 diagnostic capabilities for performing local analog loopback and local and remote digital loopback.
ASM-20 Installation and Operation Manual • Chapter 1 Introduction Built-in Ethernet bridge. Connection to an RS-449/V.36 interface is accomplished via the RS-530 interface (see Appendix A, Ethernet Interface). ASM-20 incorporates a built-in Bit Error Rate Tester (BERT). The internal BERT allows complete testing of both modems and the line without external test equipment. A front panel switch generates a pseudorandom test pattern (511-bit, according to ITU/V.52) for testing end-to-end connectivity.
ASM-20 Installation and Operation Manual Chapter 1 Introduction shows an example of an ASM-20 rear panel. A description of the rear panel can be found in Electrical Installation in Chapter 2. 100-115 VAC -0.2A T 250V The line and interface connectors are located on the rear panel of ASM-20 (see Figure 1-5). DTE ~230 V/ XMT RCV GND 0.1A T 250V Figure 1-5. ASM-20 Rear Panel with V.35 Interface 1.
ASM-20 Installation and Operation Manual Chapter 1 Introduction Modulation Timing This circuit supplies the transmit clock to the encoder. Three clock sources are available: • Internal oscillator • External from the DTE • Loop clock derived from the receive signal. Setting the XMT CLK jumper determines the timing option. See Setting Internal Jumpers and Switches in Chapter 2 for more information. XMT Level (optional) Two options are available for the XMT level (signal level): 0 and -6 dBm.
Chapter 1 Introduction ASM-20 Installation and Operation Manual A synchronous transmission is provided by internal conversion from asynchronous to synchronous mode in compliance with ITU V.22 bis. In this standard, the modem compensates for frequency deviation between the modem and the DTE by adjusting the length of the stop bit of the async character. If the modem’s frequency is lower than the DTE, the local converter deletes one stop bit in every four (25%) or eight (12.5%) characters.
ASM-20 Installation and Operation Manual 1.4 Technical Specifications Transmission Line Type Digital Interface Chapter 1 Introduction Unloaded twisted pair 19 to 26 AWG Range See Table 1-1 Level Strap-selectable to 0 dBm or -6 dBm Transmit Impedance 150Ω or LOW (strap selectable) Receive Impedance 150Ω or HIGH (strap selectable) Return Loss Greater than 15 dB Carrier Controlled by RTS or constantly ON Modulation Conditional diphase European Std. D1 Type V.
ASM-20 Installation and Operation Manual Chapter 1 Introduction Diagnostics Digital Loopback (Complies with the V.
ASM-20 Installation and Operation Manual Chapter 1 Introduction Table 0-1 Approximate Range Baud Rate kbps 19 AWG (0.8 mm) km miles 22 AWG (0.6 mm) km miles 24 AWG (0.5 mm) km miles 26 AWG (0.4 mm) km miles 256 3.75 2.3 2.85 1.75 2.25 1.4 1.9 1.2 192 6.0 3.7 4.5 2.8 3.5 2.2 2.7 1.7 144 10.6 6.6 6.75 4.2 4.5 2.8 3.4 2.1 128 12.4 7.7 7.3 4.5 5.0 3.1 3.6 2.2 115.2* 12.8 7.8 7.65 4.75 5.25 3.3 3.8 2.5 112 12.8 8.0 8.0 5.0 5.5 3.4 4.0 2.5 96 13.
Chapter 1 Introduction 1-10 Technical Specifications ASM-20 Installation and Operation Manual 02-Aug-2005 10:47
Chapter 2 Installation and Setup 2.1 Introduction This chapter provides instructions for mechanical and electrical installation of the ASM-20 standalone model. • For rack installation of the ASM-20, see Chapter 5, Card Cage Version. • For ETH interface installation see Appendix A, Ethernet Interface. • For G.703 interface installation, see Appendix B, IR-G.703 Codirectional Interface (64 kbps). • For X.21B interface installation, see Appendix C, IR-X.21B Interface Module. • For V.
Chapter 2 Installation and Setup 2.4 ASM-20 Installation and Operation Manual Equipment Needed ASM-20 is a standalone device designed to be placed on a tabletop or bench. It is delivered completely assembled. No provisions are made for bolting ASM-20 to the tabletop. No special equipment is needed for installing ASM-20. 2.5 Setting Internal Jumpers and Switches To set the jumpers and switches: 1. Disconnect the power cable. 2. Loosen the screws holding the bottom cover in place. 3.
ASM-20 Installation and Operation Manual J8 0 - 256 1 - 192 2 - 144 3 - 128 4 - 115.2 5 - 112 6 - 96 7 - 72 8 - 64 9 - 57.6 A - 56 B - 48 C - 38.4 D - 32 E - 28.8 F - 19.2 9 8 7 BAUD RATE kbps 6 3 4 5 2 1 0 F ALB DTE RLB DTE EN * J7 E D C B A DIS CON J12 DIS -6 dbm OFF J14 EN LOW 0 dbm J11 J9 J13 DIS 150 XMT LVL ON HIGH HIGH J10 RPF.
ASM-20 Installation and Operation Manual Chapter 2 Installation and Setup Table 2-1. ASM-20 Strap Selection Settings Jumper and Switch Identity Function Possible Settings** J1 V54 DIS Prevents activation of remote V.54 loops. EN DIS J2 CARRIER Selects the transmit carrier mode. When ON, transmit carrier is constantly ON. When CNTRL, transmit carrier is ON only when RTS is High. In X.21, RTS is replaced by the CONTROL signal.
ASM-20 Installation and Operation Manual Chapter 2 Installation and Setup Table 2-2. ASM-20 Strap Selection Settings (Cont.) Jumper and Switch Identity Function Possible Settings ** SW2 ASYNC LENGTH (3 dip switches) Select character length in async mode (see Table 2-3. Async Character Length Setting S1 S2 OFF ON OFF ON OFF OFF ON ON for further explanation). No. Bits 8 9 10 11 S3 Selects the stop bit reduction rate to be used in async mode. SW3 Baud Rate (kbps) Selects the data rate.
ASM-20 Installation and Operation Manual Chapter 2 Installation and Setup Table 2-3. Async Character Length Setting Start Bit Data Bits Parity Stop Bit No. of Bits 1 5 NONE 2 8 1 6 NONE 1, 1.5, 2 8 9 1 6 ODD, EVEN 1, 1.5, 2 9 10 1 7 NONE 1, 1.5, 2 9 10 1 7 ODD, EVEN 1, 1.5, 2 10 11 1 8 NONE 1, 1.5, 2 10 11 1 8 ODD, EVEN 1, 1.5, 2 11 2.
Chapter 3 Operation This chapter: • Describes the controls and indicators of ASM-20 and their functions • Explains the operation procedures • Provides jumper and switch information. Installation procedures given in Chapter 2, Installation and Setup must be completed and checked before attempting to operate the ASM-20. 3.1 Power On Apply AC power by connecting the AC power cord to an acceptable AC source. The PWR LED should light up, indicating that the ASM-20 is on.
ASM-20 Installation and Operation Manual Chapter 3 Operation ASM-20 PWR RTS TD 1 2 3 RD DCD TEST ERR 4 5 6 7 DIG ANA REM PATT A B C D Figure 3-1. ASM-20/SA Front Panel PWR 1 RTS 2 TD 3 4 DCD 5 TEST ERR 7 RPF E DIG A ANA B C PATT D ASM - 20 Figure 3-2.
ASM-20 Installation and Operation Manual Chapter 3 Operation Table 3-1. Control and Indicator Functions Item Name Type Function A DIG Pushbutton The Digital Loopback switch causes the local ASM-20 to loop received data and clock back to its transmitter. Data Set Ready will turn off (see Figure 4-5). B ANA Pushbutton The Analog Loopback (V.54 Loop 3) switch causes the local ASM-20 to loop its transmitter output back to its receiver (see Figure 4-3).
ASM-20 Installation and Operation Manual Chapter 3 Operation 3.3 Operation ASM-20 operates entirely unattended, except when the occasional monitoring of LED indicators is required. Test Activation In order to verify that the ASM-20 is operating correctly, use the internal BERT and analog loopback tests as described in Bit Error Rate Tester (BERT) in Chapter 4 and Local Test - Analog Loopback in Chapter 4.
Chapter 4 Troubleshooting and Diagnostics This chapter contains procedures for performing system diagnostic tests for ASM-20. Use the test procedures provided in this chapter to: • Verify normal system operation • Isolate faulty equipment in the event of failure. Tests are activated by control push buttons on the ASM-20 front panel and monitored via LED indicators. For a description of the ASM-20 controls and indicators and their functions, see Chapter 3, Operation. 4.
ASM-20 Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics PATT Pressed Pattern Generator Pattern Tester XMT RCV Error ASM-20 Figure 4-1. BERT Using Loops Alternatively, the complete link can be tested when using two ASM-20 modems or an external BERT. Figure 4-2 illustrates the two options for testing a complete link: • Press the PATT push button of the local modem and check the ERR/RPF LED. At the remote side check an external BERT.
ASM-20 Installation and Operation Manual 4.3 Chapter 4 Troubleshooting and Diagnostics Modem Self Test The modem self test verifies that ASM-20 is operating correctly. To verify that ASM-20 is operating correctly: 1. Press the ANA (Analog Loopback) push button on the front panel. Both the TEST and DCD LEDs should light up. If the DCD LED does not light up, check that the CARRIER jumper is ON or that the RTS signal is ON (high). 2. Press the PATT push button.
Chapter 4 Troubleshooting and Diagnostics ASM-20 Installation and Operation Manual 2. Check that the DTE is operating properly and can be used for a test. If a fault is indicated, call a technician or replace the unit. 3. Execute the test using one of the methods described below: Use the DTE and check the echoed data stream Use an external Bit Error Rate Tester (BERT) unit Use the internal Bit Error Rate Tester (BERT). Press the PATT push button.
ASM-20 Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics REM Pressed DATA CLK XMTR RCVR LOCAL DATA TERMINAL REMOTE DATA TERMINAL CLK DATA RCVR LOCAL ASM-20 XMTR REMOTE ASM-20 Figure 4-4. Remote ASM-20 in Digital Loopback Local Digital Loopback This test is activated by pressing the DIG push button. It loops the received data back to the remote ASM-20. (This test is equivalent to activating the remote loopback from the remote ASM-20 – see Figure 4-5).
ASM-20 Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics 4.6 Frequently Asked Questions Q. How is the new version of ASM-20 different from the older version? A. ASM-20 has been improved in order to get CE mark approval and has some new features. A different ordering name, ASM-20-2, was given to the newer version. Presently, any order received for ASM-20 or ASM-20-2 will be delivered as ordered until the stock of existing ASM-20 products is depleted.
ASM-20 Installation and Operation Manual 4.7 Chapter 4 Troubleshooting and Diagnostics Technical Support Technical support for this product can be obtained from the local distributor from whom it was purchased. For further information, please contact the RAD distributor nearest you or one of RAD's offices worldwide. This information can be found at www.rad.com (offices – About RAD > Worldwide Offices; distributors – Where to Buy > End Users).
Chapter 4 Troubleshooting and Diagnostics 4-8 Technical Support ASM-20 Installation and Operation Manual
Chapter 5 Card-Cage Version This chapter describes the ASM-20/R card version, designed for installation in the ASM-MN-214 card cage. The chapter describes: • ASM-MN-214 card cage • ASM-20/R card version • ASM-20/R power supply • How to install ASM-20/R. 5.1 ASM-MN-214 Card Cage The ASM-MN-214 card cage contains one or two power supplies and up to 14 plug-in cards. The card types can be ASM-20/R or other RAD rack version modems/converters - any combination of up to 14 plug-in cards.
Chapter 5 Card-Cage Version ASM-20 Installation and Operation Manual Figure 5-1.
ASM-20 Installation and Operation Manual 5.2 Chapter 5 Card-Cage Version ASM-20/R Card Version Figure 5-2. ASM-20/R Front Panel shows the ASM-20/R card front panel. The LEDs and switches of the card version are identical in their functionality to those of the standalone device. For this information, see Controls and Indicators, in Chapter 3. PWR RTS TD RD DCD TEST ERR RPF DIG ANA REM PATT ASM - 20 Figure 5-2.
ASM-20 Installation and Operation Manual Chapter 5 Card-Cage Version 5.3 Power Supply Power is supplied to the ASM-20/R card from the ASM-MN-214 power supply via the chassis. Each ASM-20/R card has two fuses, which protect the entire system against power failure resulting from a short circuit in one card. The ASM-MN-214 card cage can accept both AC or DC power supplies.
ASM-20 Installation and Operation Manual Chapter 5 Card-Cage Version Figure 5-3.
ASM-20 Installation and Operation Manual Chapter 5 Card-Cage Version 5.4 Installation To install the ASM-20/R card in the ASM-MN-214 card cage: 1. Install the ASM-MN-214 card cage in the 19" rack. 2. Adjust the jumpers and switches on the card as required (see Table 2-1 and Figure 2-3 in Chapter 2). 3. Insert the ASM-20/R card into one of the ASM-MN-214 slots. Push the bottom of the card into the cage to until it is fully inserted into the edge connector inside the rack.
Appendix A Ethernet Interface This appendix: • Describes the IR-ETH for RAD modems • Describes the different IR-ETH connector options • Lists the Ethernet bridge specifications • Explains how to install and operate an Ethernet bridge. A.1 Description The IR-ETH is an interface module for RAD modems, used for converting the Ethernet (10BaseT or 10Base2) electrical levels to the modem TTL levels.
ASM-20 Installation and Operation Manual Appendix A Ethernet Interface Line Connector Figure A-2 ASM-20 Rear Panel with IR-ETH/UTP Connector Option Line Connector Figure A-3 ASM-20 Rear Panel with IR-ETH/BNC Connector Option 13 12 11 9 (13) RCV(+) (12) RCV(-) (11) XMT(+) (9) XMT(-) (7) GND 7 DB-25 Figure A-4 IR-ETH Connector for the ASM-20 Rack-Mount Version When using the RJ-45 connector, the customer must prepare a mechanical cable for adapting the DB-25 pinout to that of RJ-45.
ASM-20 Installation and Operation Manual A.3 General LAN WAN A.4 Appendix A Ethernet Interface Ethernet Bridge Specifications LAN Table 10,000 addresses Filtering and Forwarding 15,000 pps Buffer 256 frames Delay 1 frame Standard Conforms to IEEE 802.
ASM-20 Installation and Operation Manual Appendix A Ethernet Interface 1 2 3 4 Figure A-6 Ethernet Bridge Layout (BNC option) LAN Installation For 10BaseT installation, either a straight cable or a cross-cable may be required. Use a cross-cable when connecting to a port that does not implement the crossover function internally. Otherwise, use a straight cable. (Hubs usually implement the crossover function internally while NICs and other devices do not.
ASM-20 Installation and Operation Manual Appendix A Ethernet Interface Table A-3 IR-ETH Bridge LED Indicators LED Name Description Location Color LINK ON indicates good link integrity (available only in the 10BaseT version) Panel Green COLL ON indicates collision on the attached Ethernet segment Panel Yellow RX ON when data is received from the Ethernet attached segment Panel Yellow TX ON when data is transmitted from the modem to the Ethernet segment Panel Yellow ERR D4 Bridge buffer
Appendix A Ethernet Interface A-6 Installation and Operation ASM-20 Installation and Operation Manual
Appendix B IR-G.703 Codirectional Interface (64 kbps) B.1 Introduction This appendix: • Provides a general description of the IR-G.703 codirectional interface (64 kbps) • Describes the EXT mode • Describes the INT/RCV mode B.2 General Description The IR-G.703 is an interface module for RAD modems, converting G.703 codirectional signals to TTL levels. The converted data is sent over the modem link using the modem modulation technique and converted back at the other end into G.
Appendix B IR-G.703 Codirectional Interface (64 kbps) ASM-20 Installation and Operation Manual Figure B-1. IR-G.703 Connector Options Note Note In Figure B-1, RCV refers to the input signals to the IR module; XMT refers to the output signals from the module. The IR-G.703 interface module is shown in Figure B-2. It has two operation modes which are selectable on the PCB board. The selection is made by means of the JP1 jumper located within the module as shown in Figure B-2.
ASM-20 Installation and Operation Manual Appendix B IR-G.703 Codirectional Interface (64 kbps) Modem A Modem B IR-G.703 Module TX Data G.703 Codirectional 64 kbps network TX Data Clock Recovery CLK Clock Out RX FIFO Clock Recovery Data Clock Recovery RX Data Timing Source FIFO RX TX Clock In EXT Clock Mode RCV Clock Mode Figure B-3. IR-G.703 EXT Mode Timing Block B.4 INT/RCV Mode This mode is used in applications where the G.
Appendix B IR-G.
Appendix C IR-X.21B Interface Module This appendix: • Provides a general description of the IR-X.21B interface module • Describes the IR-X.21B connectors and pin assignments • Describes the IR-X.21B interface module • Describes the EXT mode for the IR-X.21B • Describes the INT/RCV mode for the IR-X.21B. C.1 Description The IR-X.21B is an interface module for RAD modems, converting X.21 signals to TTL levels.
ASM-20 Installation and Operation Manual Appendix C IR-X.21B Interface Module The ASM-20 modem rack version requires an additional adapter to connect between the DB-15 connector of the X.21 equipment to the DB-25 connector of the ASM-MN-214 modem rack. For this purpose, an optional DB-15 attachment CIA/X.21 can be ordered separately from RAD. The attachment connects to the ASM-MN-214 rear panel as shown in Figure 5-3 for the CIA/V.35 attachment. Pin Assignment Table C-1 shows the X.
ASM-20 Installation and Operation Manual EXT JP 2 INT/RCV Appendix C IR-X.21B Interface Module INT/RCV clock setting EXT clock setting Connector DB-15 Figure C-3 Location of Jumper JP2 in the IR-X.21B Interface Module C.4 EXT Mode This mode is used in applications of X.21 networks where the system timing is provided by the X.21 network. The IR-X.21B module has internal buffers to compensate for the phase delay introduced to the system by the line delay between the two modems.
ASM-20 Installation and Operation Manual Appendix C IR-X.21B Interface Module MODEM (EXT) TD IR-X.21 Transmit Data from DTE FIFO Buffer TC External timing from DTE (2,9) (7,14) RD FIFO Buffer RC Receive Data to DTE Signal Timing DB Connector (4,11) (6,13) Figure C-4 EXT Mode Timing Block C.5 INT/RCV Mode This mode is used in applications where the IR-X.21B side uses the clock signal from the modem link. This mode is used mainly when the attached equipment has an IR-X.
Appendix D DTE Interface Connectors Table D-1 lists detailed information about each DTE interface connector.
1 7 2 3 4 5 6 20 Protective Ground Signal Ground Transmitted Data Received Data Request to Send Clear to Send Data Set Ready Data Terminal Ready D-2 DB-25 Standalone and Frame Signal Function RS-232 ASM-20 Installation and Operation Manual 20 6 5 4 12 13 11 9 7 1 DB-25 Frame H E D C DTR DSR CTS RTS 108 107 106 105 R RD(A) 104 T RD(B) 104 S TD(B) 103 P TD(A) 103 B Signal 102 Ground A Frame 101 34-pin Standalone Pin Circuit V.
DB-25 Standalone and Frame 8 24 15 17 18 21 25 Signal Function Carrier Detect External Transmit Clock Transmit Clock Receive Clock Local Analog Loop Remote Loopback Test Indicator RS-232 Appendix D DTE Interface Connectors 25 21 18 22 23 14 10 19 16 8 DB-25 Frame DCD 109 141 n and k 142 N and h 140 L and j X SCR(B) 115 V SCR(A) 115 Y SCT(A) 114 A SCT(B) 114 U SCTE(A) 113 W SCTE(B) 113 F 34-pin Standalone Pin Circuit V.
D-4 Appendix D DTE Interface Connectors ASM-20 Installation and Operation Manual
Appendix E Connection to RS-422 Table E-1 describes how to connect ASM-20 (EIA 530) to a RS-422 (V.36) DTE. Table E-1. Interface List for Connecting ASM-20 (RS- 530) to RS-422 (V.
Appendix E Connection to RS-422 E-2 ASM-20 Installation and Operation Manual
Appendix F Unit Case Assembly This appendix: • Describes the unit case • Describes how to install the unit case into a 19-inch rack. F.1 Unit Case The unit case design facilitates quick access to the interior strappings as well as easy installation into a 19-inch rack. F.2 Installation of the Unit Case into a 19-inch Rack The height of the unit is 1U (1.75 in); the width of the unit is slightly less than half the available mounting width.
ASM-20 Installation and Operation Manual Appendix F Unit Case Assembly Short Bracket Fastening Screws Long Bracket Figure F-1. Installing a Single Unit Installing Two Units Rack adapter components for installing two units include: two long side rails (one for each unit) that slide into each other fastening the two units together, and two short side brackets which hold the two units in the 19-inch rack. See Figure F-2.
ASM-20 Installation and Operation Manual Appendix F Unit Case Assembly Left-Hand Unit Rail Short Bracket Right-Hand Unit Rail Short Bracket Figure F-2 Rack Adapter Components for Installation of Two Units To install two units: 1. Fasten one long side rail to each unit (right side to one unit, left side to the other unit) using the four screws and flat washers supplied.
ASM-20 Installation and Operation Manual Appendix F Unit Case Assembly 4. ). 5. Secure the supplied plastic caps to the ends of the rails, to prevent the units moving and to protect the rail ends. 6. Place the assembled units in the rack and fasten the brackets to the side rails of the rack, by means of the four screws situated on each side (not included in the kit). Figure F-2.
24 Raoul Wallenberg St., Tel Aviv 69719, Israel Tel: +972-3-6458181, Fax: +972-3-6483331, +972-3-6498250 E-mail: erika_y@rad.com, Web site: www.rad.com Customer Response Form RAD Data Communications would like your help in improving its product documentation. Please complete and return this form by mail or by fax or send us an e-mail with your comments.
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