Installation and Operation Manual FOM-40 High-Speed Fiber Optic Modem Version 2
FOM-40 Version 2 High-Speed Fiber Optic 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 FOM-40 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: FOM-40 Product Name: conforms to the following standard(s) or other normative document(s): EMC: Safety: EN 55022: 1994 Limits and methods of measurement of radio disturbance characteristics of information technology equipment.
Quick Start Guide Installation of FOM-40 should be carried out only by an experienced technician. If you are familiar with FOM-40, use this guide to set it up for operation. This guide describes installation of the standalone version of the modem. Perform the installation procedures for both the local and the remote units. 1. Installing FOM-40 The instructions below list the settings necessary to configure FOM-40 for proper operation.
FOM-40 Installation and Operation Manual Quick Start Guide Switch CLK SEL SW5/6-7 Description Selects the transmit timing source Values Default Setting 6 7 6 7 INT – Internal clock OFF OFF OFF OFF INT – Internal clock ON ON RCV – Receive clock OFF ON EXT – External clock ON OFF Note: FOM-40 units with one of the Ethernet interface modules (IR-ETH or IR-ETH/QV) do not support external clock.
FOM-40 Installation and Operation Manual Switch Description Quick Start Guide Values Default Setting Baud Rate 1 [kbps] BAUD RATE, SW5/1–4 Selects the baud rate 2 3 4 56 OFF OFF OFF OFF 64 OFF OFF OFF ON 64 96 OFF OFF ON OFF 112 OFF OFF ON ON 128 OFF ON OFF OFF 192 OFF ON OFF ON 256 OFF ON ON OFF 384 OFF ON ON ON 512 ON OFF OFF OFF 768 ON OFF OFF ON 1024 ON OFF ON OFF 1536 ON OFF ON ON 1544 ON ON OFF OFF 2048 ON ON OFF ON N/A ON ON ON OFF N/A ON ON ON ON Connecting
FOM-40 Installation and Operation Manual Quick Start Guide 2. Operating FOM-40 FOM-40 does not require operator attention once installed and configured. Verifying Performance When data is being transferred, observe that the following front panel LEDs light or blink: 4 • PWR – ON • RTS – Blinking or ON • TD – Blinking or ON • RD – Blinking or ON • DCD – ON • ERR – OFF • TEST – OFF.
Contents Chapter 1. Introduction 1.1 Overview..................................................................................................................... 1-1 Versions................................................................................................................................ 1-1 Applications.......................................................................................................................... 1-1 Features.........................................................
Table of Contents Line Connector..................................................................................................................... 6-1 DB-25 DTE Connector.......................................................................................................... 6-1 6.2 Power Supply .............................................................................................................. 6-3 AC Supply ....................................................................................
Chapter 1 Introduction 1.1 Overview FOM-40 is a synchronous high-speed fiber optic modem that provides a secure, long-range data link between computers, routers, multiplexers, and other DTEs. Versions The following versions of the modem are available: • FOM-40 standalone unit • FOM-40/R: plug-in card for installation in the ASM-MN-214, 19-inch modem rack, that holds up to 14 cards.
FOM-40 Installation and Operation Manual Chapter 1 Introduction Figure 1-2 shows a application of FOM-40 that uses an X.21 interface adapter in a digital network tail-end configuration. Figure 1-2. Tail-End Application for DDS Service Features Fiber Optic Interface Table 1-1 lists the characteristics of the fiber optic interface types of FOM-40 and FOM-40/R, including the maximum ranges. The maximum range values given assume a margin of 3dB. Table 1-1.
FOM-40 Installation and Operation Manual Chapter 1 Introduction Diagnostics FOM-40 features RLB and LLB diagnostics for performing local analog and digital loopbacks and remote digital loopback. The local analog and remote digital loopbacks are controlled by front-panel pushbuttons or by a DTE interface for V.24, V.35 and RS-530 protocols. A front panel pushbutton generates an internal 511-bit pseudo-random test pattern (PATT), according to ITU V.52, for direct end-to-end integrity testing.
FOM-40 Installation and Operation Manual Chapter 1 Introduction 1.3 Functional Description This section contains functional descriptions of the FOM-40 circuit blocks shown in Figure 1-4. Figure 1-4. FOM-40 Block Diagram FOM-40 provides a high-speed data link between computers, routers, or multiplexers. The electrical signals from the DTE unit are converted into an optical signal using an infrared light emitting diode.
FOM-40 Installation and Operation Manual Chapter 1 Introduction The test can be carried out in local analog loopback, in remote digital loopback or in normal point-to-point operation opposite a remote FOM-40 modem. 1.4 Optical Interface DTE Interface Technical Specifications Transmission Line Dual fiber optical cable Specifications and Ranges See Table 1-1 Type • V.24 (RS-232), 25-pin D-type, female • RS-530 (V.11/RS-422), 25-pin D-type, female • V.35, 34-pin, female • X.
FOM-40 Installation and Operation Manual Chapter 1 Introduction ERR (red) Physical FOM-40/SA Power Environment 1-6 Error Height 40 mm / 1.5 in Width 190 mm / 7.4 in Depth 160 mm / 6.2 in Weight 0.6 kg FOM-40/R Fits a single slot in the ASM-MN-214 modem rack AC Source 100 to 240 VAC (±10%), 50 to 60 Hz, 3VA max DC Source 24/–48 VDC (±10%), 4W Temperature 0°–50°C / 32°–122°F Humidity Up to 90%, non-condensing Technical Specifications / 1.
Chapter 2 Installation and Setup This chapter describes installation and setup procedures for the standalone FOM-40 modem. FOM-40 is delivered completely assembled. It is designed for tabletop or 19-inch rack installation. For instructions on installing one or two units in a 19-inch rack, refer to the guide that comes with the rack mount kit. To check normal operation after installing the unit, see Chapter 3. For instructions on how to configure the unit, see Chapter 4.
Chapter 2 Installation and Setup FOM-40 Installation and Operation Manual 2.2 Package Contents The FOM-40 package includes the following items: • One FOM-40 or FOM-40/R unit • Last Mile Access and Intelligent Modems CD • CBL-530/449 adapter cable for the FOM-40 units with V.36 interface • AC power cord or DC power supply connector kit • RM-29 rack mount kit (if ordered). 2.3 Installing FOM-40 FOM-40 is a standalone device intended for tabletop or bench installation.
FOM-40 Installation and Operation Manual Chapter 2 Installation and Setup Connecting the Cables AC Power DTE Interface Fiber Optic Interface SW5 Switches Figure 2-1. FOM-40 Rear Panel (AC Version) Connecting the Fiber Optic Interface Two fiber optic ST, SC, or FC connectors are located on the rear panel and marked TX and RX. To connect the fiber optic cables 1. Remove the protective caps from the connectors and store them in a safe place for later use. 2.
Chapter 2 Installation and Setup FOM-40 Installation and Operation Manual Connecting the Power To connect FOM-40 to the power source, refer to the appropriate section below, depending on your version of the unit (AC or DC). Warning Before switching on this unit and connecting any other cable, the protective earth terminals of this unit must be connected to the protective ground conductor of the mains power cord. If you are using an extension cord (power cable) make sure it is grounded as well.
Chapter 3 Operation This chapter provides the following information for the FOM-40 standalone modem: • FOM-40 front-panel indicators and controls • Operating procedures. Before operating FOM-40, complete and check all installation procedures in Chapter 2. 3.1 Front Panel Controls and Indicators Figure 3-1 shows the FOM-40 front panel. Table 3-1 lists FOM-40 controls and indicators. Figure 3-1.
FOM-40 Installation and Operation Manual Chapter 3 Operation Table 3-1. FOM-40 Front Panel Controls and Indicators Name Type Function PWR Green LED ON – Power is on. RTS Yellow LED ON – The DTE activates Request To Send. TD Yellow LED ON – Steady SPACE is being transmitted. Blinks – Data is being transmitted. RD Yellow LED ON – Steady SPACE is being received. Blinks – Data is being received. DCD Yellow LED ON – A valid receive signal is present.
FOM-40 Installation and Operation Manual Chapter 3 Operation 3.3 Normal Indications Table 3-2 shows the correct status of the FOM-40 indicators after the local and remote modem are synchronized and data is being transferred. Table 3-2.
Chapter 3 Operation 3-4 Turning Off FOM-40 FOM-40 Installation and Operation Manual
Chapter 4 Configuration This chapter contains the following information for the FOM-40 standalone modem: • Configuration procedure for the modem • How to set the front panel DIP switches. 4.1 Configuring FOM-40 This section describes how to configure FOM-40. Section 4.2 provides details on the functions of the DIP switches, and their default settings. To configure FOM-40: 1. Disconnect all the cables connected to FOM-40. 2.
FOM-40 Installation and Operation Manual Chapter 4 Configuration 4.2 FOM-40 Dip Switches The following FOM-40 rear panel illustrates the DIP switches that allow you to select the transmit timing source and carrier mode, baud rate, and control loopbacks. Table 4-1 lists and explains the functions of all the DIP switches. SW5 DIP Switches Figure 4-1. FOM-40 Rear Panel Figure 4-2.
FOM-40 Installation and Operation Manual Chapter 4 Configuration Table 4-1. FOM-40 DIP Switches Settings Switch CLK SEL switches SW5/6-7 Description Selects the transmit timing source Values Default Setting 6 7 6 7 INT – Internal clock OFF OFF OFF OFF INT – Internal clock ON ON RCV – Receive clock OFF ON EXT – External clock ON OFF Note: FOM-40 units with one of the Ethernet interface modules (IR-ETH or IR-ETH/QV) do not support external clock.
FOM-40 Installation and Operation Manual Chapter 4 Configuration Table 4-1. FOM-40 Dip Switches Settings (Cont.
Chapter 5 Troubleshooting and Diagnostics This chapter contains procedures for performing FOM-40 diagnostic tests. Use the test procedures provided in this chapter to: • Verify normal system operation • Isolate faulty equipment • Identify other sources of system malfunction. The tests are activated by control pushbuttons on the FOM-40 front panel and monitored with LED indicators. For a description of FOM-40 controls and indicators and their functionality, see Chapter 3. 5.
FOM-40 Installation and Operation Manual Chapter 5 Troubleshooting and Diagnostics Local Analog Loopback (LLB) The local analog loopback (LLB) test checks the performance of the local FOM-40 modem, the local DTE, and the connections between them (see Figure 5-1). The test is performed separately at the local and the remote site. ANA Pressed Data Clock Transmit Line Interface DTE Clock Data Receive FOM-40 Figure 5-1. Local Analog Loopback To perform the local analog loopback test: 1.
FOM-40 Installation and Operation Manual Chapter 5 Troubleshooting and Diagnostics Remote Digital Loopback (RLB) The remote digital loopback (RLB) test checks the performance of the local and the remote FOM-40 units and their connecting lines. The remote digital loopback sets a loop at the remote FOM-40 unit from the DTE connected to the local unit (see Figure 5-2).
FOM-40 Installation and Operation Manual Chapter 5 Troubleshooting and Diagnostics Local Digital Loopback (DIG) The local digital loopback (DIG) test allows the operator at the remote end to check the performance of the local and remote FOM-40 units, and their connecting lines. The DIG test loops the received data back to the remote FOM-40 (see Figure 5-3). The local digital loopback test is equivalent to activating the remote loopback from the remote FOM-40.
FOM-40 Installation and Operation Manual Chapter 5 Troubleshooting and Diagnostics Modem Self-Test The modem self-test checks that the modem is operating correctly (see Figure 5-4). PATT Pressed ANA Pressed Pattern Generator Transmitter Pattern Tester Receiver ERR FOM-40 Figure 5-4. Modem Self-Test To perform the modem self-test: 1. Press the ANA pushbutton on the front panel. The TEST and DCD LEDs light.
FOM-40 Installation and Operation Manual Chapter 5 Troubleshooting and Diagnostics PATT Pressed (Disconnects External BERT) PATT Pressed (Disconnects External BERT) Pattern Generator Pattern Tester Line Interface ERR Line Interface Pattern Tester Pattern Generator ERR FOM-40 FOM-40 Figure 5-5. BER System Test (Two-BER Test) 5.3 Inverting Signal for V.54 Compatibility In FOM-40 a proprietary protocol inverts signal data relative to a regular V.54.
FOM-40 Installation and Operation Manual Chapter 5 Troubleshooting and Diagnostics Figure 5-6. Switch SW6/1 Inverts Signal Data 5.4 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 5 Troubleshooting and Diagnostics 5-8 Technical Support FOM-40 Installation and Operation Manual
Chapter 6 FOM-40/R Card This chapter describes the FOM-40/R card, designed for installation in the ASM-MN-214 card cage. The chapter contains the following sections: • The ASM-MN-214 card cage • ASM-MN-214 power supply • FOM-40/R front panel • Installing the FOM-40/R card. 6.1 ASM-MN-214 Card Cage The ASM-MN-214 card cage contains one or two power supplies and up to 14 plug-in cards.
FOM-40 Installation and Operation Manual Chapter 6 FOM-40/R Card Terminal Block CIA/V.35/1 CIA/X.21/1 CIA/ETH CBL-530/449 Figure 6-1.
FOM-40 Installation and Operation Manual Chapter 6 FOM-40/R Card 6.2 Power Supply Power is supplied to the FOM-40/R card from the ASM-MN-214 power supply through the chassis. FOM-40/R card has two fuses (F1 and F2), which protect the entire system against power failure resulting from a short circuit in one card (see Figure 6-1). The rating of the fuses is 1A, 250V, slow blow. The ASM-MN-214 card cage can accept both AC or DC power supplies.
FOM-40 Installation and Operation Manual Chapter 6 FOM-40/R Card 6.3 FOM-40/R Front Panel Figure 6-2 shows the FOM-40/R card front panel. The LEDs and pushbuttons of the card version are identical in their functionality to those of the standalone device. For this information, see Front Panel Controls and Indicators in Chapter 3. PWR RD TD RTS DCD TEST ERR DIG ANA REM PATT TX RX FOM-40 Figure 6-2.
FOM-40 Installation and Operation Manual Chapter 6 FOM-40/R Card Figure 6-3.
FOM-40 Installation and Operation Manual Chapter 6 FOM-40/R Card 6.4 Installing the FOM-40/R Card Setting Internal Jumpers and Switches The FOM-40/R internal jumpers and switches are illustrated in Figure 6-4. Table 6-1 details the jumper and switch settings. SW1 EN DIS CHASS GND JP2 JP1 DIS CON 1536 2 768 JP3 3 384 4 2048 5 1024 6 512 7 256 8 128 9 64 A 112 B 56 E 192 F 96 CARR CNT ON JP4 V54 DELAY NO YES JP5 TIMING EXT INT RCV F1 JP6 1A 250V F2 1A 250V Figure 6-4.
FOM-40 Installation and Operation Manual Chapter 6 FOM-40/R Card Table 6-1. FOM-40/R Internal Jumpers and Switches Jumper Description Values Default Setting TIMING, JP6 Selects the transmit timing source EXT – External clock INT INT – Internal clock RCV – Receive clock Note: FOM-40/R cards with one of the Ethernet interface modules (IR-ETH or IR-ETH/QV) do not support external clock.
FOM-40 Installation and Operation Manual Chapter 6 FOM-40/R Card Installing FOM-40/R into the ASM-MN-214 Card Cage To install the FOM-40/R card in the ASM-MN-214 card cage: 1. Install the ASM-MN-214 card cage in the 19-inch rack. 2. Insert the FOM-40/R card into one of the ASM-MN-214 slots. 3. Push the card into the cage until it is fully inserted into the edge connector inside the rack. 4. Tighten the screws on front panel of the modem card.
Appendix A Connector Wiring A.1 V.24, V.35 and X.21 Interface Connectors Table A-1 describes the signal assignments for the FOM-40 V.24, V.35 and X.21 DTE interface connectors. Table A-1. DTE Interface Signal Assignments Signal Function V.24 DB-25 Standalone and Card Cage V.35 DB-25 Card Cage X.21 34-Pin Standalone Pin DB-25 Card Cage Circuit Description DB-15 Standalone Pin Circuit (Function) Protective Ground 1 1 A Frame 101 1 1 ---(Shield) Chassis Ground.
FOM-40 Installation and Operation Manual Appendix A Connector Wiring Table A-1. DTE Interface Signal Assignments (Cont.) Signal Function V.24 DB-25 Standalone and Card Cage V.35 DB-25 Card Cage X.21 34-Pin Standalone Pin DB-25 Card Cage Circuit Description DB-15 Standalone Pin Circuit (Function) Data Set Ready 6 6 E DSR 107 A positive level from FOM-40 when power is on, and FOM-40 is (a) not in digital loopback mode, or (b) has not received a remote loopback signal from the remote unit.
FOM-40 Installation and Operation Manual A.2 Appendix A Connector Wiring RS-530 and V.36 Interface Connectors The FOM-40 V.36 interface is provided via an adapter cable converting between 25-pin RS-530 connector and 37-pin V.36 connector. Table A-2 lists the cable wiring. Table A-2. Cable Converting between RS-530 and V.36 Interfaces, Pin Assignment Signal Function V.
FOM-40 Installation and Operation Manual Appendix A Connector Wiring A.3 T1 Interface Connector The balanced T1 interface of the standalone unit terminates in RJ-45 connector. Table A-2 lists the T1 connector pin assignment. Table A-3. T1 Balanced Connector Pinout A.
FOM-40 Installation and Operation Manual A.5 Appendix A Connector Wiring FOM-40/R with G.703 Codirectional Interface, DTE Connection FOM-40/R with G.703 Codirectional interface uses an adapter cable that converts one DB-25 connector to an RJ-45 connector. Refer to Figure A-1 and Table A-4 for the pin designations and their assignment. 2 7 9 16 11 Figure A-2. Pin Designation in the DB-25 Connector of ASM-MN-214 Card Cage Table A-5. DB-25 and RJ-45 Pinout, G.
Appendix A Connector Wiring A-6 FOM-40 Installation and Operation Manual FOM-40/R with G.
Appendix B IR-ETH/QV Interface Module B.1 Introduction The IR-ETH/QV interface module replaces the IR-ETH/QN interface module. The IR-ETH/QV has improved functionality including two new priority queues. IR-ETH/QV includes a high-performance self-learning Fast Ethernet bridge. It connects to the LAN through a single 10BaseT or 100BaseT port, and operates in full- or half-duplex to provide a simple and cost-effective interconnection between 10/100BaseT LANs.
FOM-40 Installation and Operation Manual Appendix B IR-ETH/QV Interface Module B.2 IR-ETH/QV Options Standalone FOM-40 Figure B-2 shows the panel of the IR-ETH/QV module. Table B-1 lists the module's RJ-45 connector pinout. Figure B-2. Panel of IR-ETH/QV Module Table B-1.
FOM-40 Installation and Operation Manual Appendix B IR-ETH/QV Interface Module B.3 Technical Specifications Bridge LAN LAN Table 1,024 MAC addresses Aging 5 minute, automatic Filtering and Forwarding Rate 150,000 packets per second Buffer Size 170 frames Frame Size 1535 bytes (max) Standard IEEE 802.3/Ethernet V.2, IEEE 802.1q (relevant parts), 802.1p, 802.
FOM-40 Installation and Operation Manual Appendix B IR-ETH/QV Interface Module B.4 Installation and Operation Figure B-3 shows the DIP switch locations and the default settings of the IR-ETH/QV PCB. The screen print tables on the IR-ETH/QV PCB are look-up tables of the enabled function settings. The tables do not show the default settings. For example, MDI in OFF position, MDI is enabled. SW2 1. 100 2. AN 3. FDX 4. NC 5. NC 6. NC ON ON SW1 1. MDI 2. NC 3. NC 4. FLC 5. FIL 6. FP 7. NC 8.
FOM-40 Installation and Operation Manual Appendix B IR-ETH/QV Interface Module Table B-2.
FOM-40 Installation and Operation Manual Appendix B IR-ETH/QV Interface Module Backpressure and Flow Control DIP switch SW1/4 enables or disables both backpressure and flow control. When the IR-ETH/QV is set to half-duplex, backpressure is active, and when the IR-ETH/QV is set to full-duplex, flow control is active. Note Full-duplex flow control activation requires autonegotiation to be enabled.
Appendix C IR-G.703/CO Interface Module C.1 Introduction IR-G.703/CO is an interface module for RAD modems that converts G.703 64 kbps 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.703 64 kbps codirectional signals, or into any other digital interface signal possible. IR-G.
FOM-40 Installation and Operation Manual Appendix C IR-G.703/CO Interface Module C.2 Selecting the IR-G.703/CO Timing The IR-G.703/CO interface module can operate with EXT or INT/RCV timing to match the clock reference of the FOM-40 modem. The clock selection is made using the JP1 jumper located on the module board (see Figure C-2). INT/RCV EXT JP1 Figure C-2. JP1 Location on the IR-G.703/CO Board EXT Timing The EXT clock is used in applications where the G.703 network provides system timing.
FOM-40 Installation and Operation Manual Appendix C IR-G.703/CO Interface Module INT/RCV Timing The INT/RCV clock is used in applications that recover the clock signal from the modem link. This mode is used when the attached equipment has a G.703 codirectional interface but cannot produce clock signals. The module has an 8-bit FIFO buffer to compensate for the phase delay introduced by the G.703 device. Figure C-4 illustrates the buffer connection and the required application setup.
Appendix C IR-G.703/CO Interface Module C-4 Selecting the IR-G.
Appendix D IR-X.21Interface Module D.1 Introduction IR-X.21 is an interface module that converts X.21 signals to TTL levels. The converted data is sent over the modem link, using the modem modulation technique, and is converted back at the other end into X.21 signals, or into any other digital interface signal. Figure D-1 shows a typical application of FOM-40 with IR-X.21 interface module. Fiber Optic Cable X.21 Router FOM-40 X.21 FOM-40 Router Figure D-1. Typical Application of FOM-40 with IR-X.
FOM-40 Installation and Operation Manual Appendix D IR-X.21Interface Module Table D-1. IR-X.21 Connector Pin Assignment (Cont.) Pin ID Function 9 B Transmit B 10 B Control B 11 B Receive B 12 B Indication B 13 B Signal Timing B 14 B External Timing D.2 Selecting the IR-X.21 Timing IR-X.21 interface module supports two clock modes: • EXT (External) • INT/LBT (Internal/Receive). Set the IR-X.21 clock to match the timing selected for the FOM-40 modem.
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