[PDF] FOM-20. Fiber Optic Modem Installation and Operation Manual. Notice

1 FOM-20 Fiber Optic Modem Installation and Operation Manual Notice This manual contains information that is proprietary...

FOM-20 Fiber Optic Modem Installation and Operation Manual

Notice This manual contains information that is proprietary to RAD Data Communications. No part of this publication may be reproduced in any form whatsoever without prior written approval by RAD Data Communications. No representation or warranties for fitness for any purpose other than what is specifically mentioned in this manual is made either by RAD Data Communications or its agents. For further information contact RAD Data Communications at the address below or contact your local distributor.

International Headquarters RAD Data Communications Ltd.

U.S. Headquarters RAD Data Communications Inc.

24 Raoul Wallenberg St. Tel Aviv 69719 Israel Tel: 972-3-6458181 Fax: 972-3-6498250 E-mail: [emailprotected]

900 Corporate Drive Mahwah, NJ 07430 USA Tel: (201) 529-1100 Toll free: 1-800-444-7234 Fax: (201) 529-5777 E-mail: [emailprotected]

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Publication No. 312-200-11/00

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Warranty This RAD product is warranted against defects in material and workmanship for a period of one year from date of shipment. During the warranty period, RAD will, at its option, either repair or replace products which prove to be defective. For warranty service or repair, this product must be returned to a service facility designated by RAD. Buyer shall prepay shipping charges to RAD and RAD shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges, duties and taxes for products returned to RAD from another country.

Limitation of Warranty

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyer-supplied firmware or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation or maintenance.

Exclusive Remedies

The remedies provided herein are the Buyer’s sole and exclusive remedies. RAD shall not be liable for any direct, indirect, special, incidental, or consequential damages, whether based on contract, tort, or any legal theory.

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Safety Warnings The exclamation point within a triangle is intended to warn the operator or service personnel of operation and maintenance factors relating to the product and its operating environment which could pose a safety hazard. Always observe standard safety precautions during installation, operation and maintenance of this product. Only a qualified and authorized service personnel should carry out adjustment, maintenance or repairs to this instrument. No adjustment, maintenance or repairs should be performed by either the operator or the user.

Telecommunication Safety The safety status of each of the ports on FOM-20 is declared according to EN 41003 and is detailed in the table below: Safety Status

Ports

SELV*

Ethernet, RS-530, V.35, X.21B, V.24, V.36

TNV-1**

G.703

*SELV = Safety Extra-Low Voltage **TNV-1 = Telecommunications Network Voltage in the limits of SELV and subject to overvoltage.

Laser Warnings This product may be equipped with a laser diode. In such a case, this laser warning symbol label will be attached near the optical transmitter. Please observe the following precautions: •

Do not attempt to adjust the laser drive current.

•

Do not use broken or unterminated fiber-optic cables/connectors or stare at the laser beam.

•

The use of optical equipment with this product will increase eye hazard.

•

Use of controls, adjustments or performing procedures other than those specified herein, may result in hazardous radiation exposure.

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Regulatory Information FCC-15 User Information

This equipment has been tested and found to comply with the limits of the Class A digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his/her own expense.

Warning per EN 55022

This is a Class A product. In a domestic environment, this product may cause radio interference, in which case the user may be required to take adequate measures.

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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: Product Name:

FOM-20

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.

EN 50082-1 (1992)

Electromagnetic compatibility – Generic immunity standards for residential, commercial and light industry.

EN 60950 (1992/93)

Safety of information technology equipment, including electrical business equipment.

Supplementary Information: The product herewith complies with the requirements of the EMC Directive 89/336/EEC and the Low Voltage Directive 73/23/EEC. The product was tested in a typical configuration. Tel Aviv, November 4th, 1996

Haim Karshen VP Quality European Contact: RAD Data Communications GmbH, Berner Strasse 77, 60437 Frankfurt am Main, Germany

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Quickstart Guide Installation of FOM-20 should be carried out only by an experienced technician. If you are familiar with fiber-optic modems, use this guide to prepare FOM-20 for operation. If you are not familiar with fiber-optic modems, read Chapter 2 and Chapter 3. This guide is for the standalone version of the modem. For the card version, see Chapter 5.

1. Starting up Setting the Jumpers/Switches

Confirm that the following switches and jumpers, mounted on the board, are set correctly for the chosen operating mode. Make sure that the power cord is disconnected before removing the unit's cover.

Warning

Connecting the Interfaces

•

Jumper J3: Set the XMT CLOCK mode: INT, EXT, RCV, ASY Default is INT.

•

Selector switch SW3: Set the BAUD RATE: 19.2, 28.8, 32, 38.4, 48, 56, 57.6, 64, 72, 96, 112, 115.2, 128, 144, 192, 256 kbps. Default is 64 kbps.

•

Jumper J6: Set SW EN to On or OFF. Default is ON.

•

Connect the Data Terminal Equipment to the appropriate DTE connector on the rear panel of FOM-20.

•

Connect the fiber optic cables to the respective Rx-Tx and Tx-Rx connectors on the rear panel of FOM-20.

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FOM-20 Installation & Operation Manual

Quick Start Guide

Connecting the Power

FOM-20, AC Version 1. Connect the power cable to the AC input jack on the rear panel of the modem. 2. Connect FOM-20 to a power source. The PWR LED lights to indicate that FOM-20 is on. FOM-20, DC Version 1. Connect the three wires (-48 VDC, +48 VDC, CHASSIS GND) to the RAD-supplied adapter plug from the DC power source. Follow the instructions in the DC Power Supply supplement at the end of the manual. 2. Attach the DC adapter plug to the DC input jack on the rear panel of the modem. 3. Connect FOM-20 to a power source. The PWR LED lights to indicate that FOM-20 is on.

Verifying Performance

When data is being transferred, observe that the following front panel LEDs light or blink:

•

PWR Lights

•

RTS

Blinks or not lit

•

Blinks or not lit

•

Lights

•

DCD Lights

•

TEST

Not lit

•

ERR

Not lit

2. Testing Performance Verifying Modem Operation

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After powering up the modem, if the modem does not operate properly, see Chapter 4 for more information on the FOM-20 functional tests.

Testing Performance

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Contents CHAPTER 1 INTRODUCTION 1.1 Overview ....................................................................................................................... 1-1 General ................................................................................................................................ 1-1 Applications.......................................................................................................................... 1-2 Versions................................................................................................................................ 1-3 Features................................................................................................................................ 1-3

1.2 Physical Description ....................................................................................................... 1-4 Front Panel ........................................................................................................................... 1-4 Rear Panel ............................................................................................................................ 1-4

1.3 Functional Description ................................................................................................... 1-5 General ................................................................................................................................ 1-5 Interface ............................................................................................................................... 1-5 Timing .................................................................................................................................. 1-5 Async-to-Sync Converter ....................................................................................................... 1-5 Diagnostics ........................................................................................................................... 1-6

1.4 Technical Specifications ................................................................................................. 1-7 Electrical Interface................................................................................................................. 1-7 Optical Interface ................................................................................................................... 1-7 Diagnostics ........................................................................................................................... 1-8 Timing Elements ................................................................................................................... 1-8 Indicators.............................................................................................................................. 1-8 Power Supply ....................................................................................................................... 1-8 Physical ................................................................................................................................ 1-8 Environment ......................................................................................................................... 1-8

CHAPTER 2 INSTALLATION AND SETUP 2.1 Site Requirements and Prerequisites .............................................................................. 2-1 Power................................................................................................................................... 2-1 Ambient Requirements ......................................................................................................... 2-1

2.2 Package Contents........................................................................................................... 2-2 FOM-20 ............................................................................................................................... 2-2 FOM-20/R ............................................................................................................................ 2-2

2.3 Installation and Setup..................................................................................................... 2-2 Setting the Internal Jumpers and Switches.............................................................................. 2-2 Connecting the Interfaces...................................................................................................... 2-6 Connecting the Power........................................................................................................... 2-7

CHAPTER 3 OPERATION 3.1 General.......................................................................................................................... 3-1 3.2 Front Panel Controls and Indicators................................................................................ 3-1 3.3 Initial Operation and Basic Checks................................................................................. 3-3 Power-on Procedure ............................................................................................................. 3-3 Running Self Test .................................................................................................................. 3-3

3.4 Operating Instructions.................................................................................................... 3-4 Changing Field Strapping....................................................................................................... 3-4 Running Diagnostic Loops..................................................................................................... 3-4 Power-off Procedure ............................................................................................................ 3-4

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Table of Contents

CHAPTER 4 TROUBLESHOOTING & DIAGNOSTICS 4.1 General.......................................................................................................................... 4-1 4.2 Loopback Tests .............................................................................................................. 4-2 Local Test - Local Analog Loopback (LLB) Standard V.54........................................................ 4-2 Remote Digital Loopback (RLB) Standard V.54 ...................................................................... 4-4 Local Digital Loopback (DIG) Non-Standard .......................................................................... 4-4

4.3 Internal BERT Circuit Test............................................................................................... 4-5 Modem Self-Test................................................................................................................... 4-5 Two-BERT Test ..................................................................................................................... 4-6

4.4 (Local) Analog Loopback Test ......................................................................................... 4-7 Loopback Function ............................................................................................................... 4-8

4.5 Communication Link Test .............................................................................................. 4-9 Remote Digital Loopback...................................................................................................... 4-9 Local Digital Loopback.......................................................................................................... 4-9

4.6 Troubleshooting Instructions......................................................................................... 4-10 CHAPTER 5 CARD CAGE VERSION 5.1 ASM-MN-214 Card Cage ............................................................................................... 5-1 5.2 FOM-20/R Card Version................................................................................................. 5-2 5.3 Power Supply................................................................................................................. 5-3 AC Supply (100, 115 or 230 VAC)......................................................................................... 5-3 DC Supply (-48 VDC) ........................................................................................................... 5-3 Power Supply with Redundancy............................................................................................ 5-3

5.4 Installation ..................................................................................................................... 5-4 Jumper Settings..................................................................................................................... 5-4 Mechanical Installation.......................................................................................................... 5-4

APPENDIX A ETHERNET INTERFACE APPENDIX B G.703 INTERFACE (64 KBPS) APPENDIX C X.21B INTERFACE APPENDIX D DTE INTERFACE SIGNAL ASSIGNMENTS APPENDIX E CONNECTING RS-530 TO RS-422

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Table of Contents

List of Figures Figure 1-1 Figure 1-2 Figure 1-3 Figure 1-4 Figure 1-5

Point-to-Point Application............................................................................................ 1-2 Tail End for Digital Network Application ...................................................................... 1-2 Extension of G-703 Codirectional Network.................................................................. 1-2 FOM-20 Front View..................................................................................................... 1-4 FOM-20 Block Diagram............................................................................................... 1-6

Figure 2-1 FOM-20 Main Board Layout ........................................................................................ 2-4 Figure 2-2 FOM-20/Standalone Rear Panel (AC-Powered Version) ............................................... 2-6 Figure 3-1 FOM-20 Front Panel .................................................................................................... 3-1 Figure 4-1 Figure 4-2 Figure 4-3 Figure 4-4 Figure 4-5 Figure 4-6 Figure 4-7

Local FOM-20 in Analog Loopback (LLB) ..................................................................... 4-3 FOM-20 in Remote Digital Loopback (RLB) ................................................................. 4-4 Activation of RLB at the Remote Modem (Local FOM-20 in a Digital Loopback).......... 4-5 FOM-20 Self-Test ........................................................................................................ 4-6 FOM-20 BER System Test (Two-BERT Test).................................................................. 4-7 Local Analog Loopback ................................................................................................ 4-8 Local FOM-20 in Digital Loopback .............................................................................. 4-9

Figure 5-1 Figure 5-2 Figure 5-3 Figure 5-4

ASM-MN-214 Cage, Rear View ................................................................................... 5-2 FOM-20/R, Front Panel Features.................................................................................. 5-3 ASM-MN-214 Front Panel ........................................................................................... 5-4 FOM-20/R Card, Layout Diagram ................................................................................ 5-5

Figure A-1 Figure A-2 Figure A-3 Figure A-4 Figure A-5 Figure A-6

Ethernet Interface Typical Application ......................................................................... A-1 FOM-20 Rear Panel with IR-ETH/UTP Connector Option............................................ A-2 FOM-20 Rear Panel with IR-ETH/BNC Connector Option ........................................... A-2 IR-ETH Connector for the FOM-20 Rack-Mount Version ............................................. A-2 Ethernet Bridge Layout (UTP Option) .......................................................................... A-4 Ethernet Bridge Layout (BNC option)........................................................................... A-4

Figure B-1 Figure B-2 Figure B-3 Figure B-4 Figure B-5

FOM-20/Standalone, Rear Panel with G.703 Terminal Block ....................................... B-1 IR G.703 Connector Options ....................................................................................... B-2 Strap-Selectable Operation Modes (using Jumper JP1) ................................................. B-2 EXT Mode Timing Block .............................................................................................. B-3 INT/RCV Mode Timing Block....................................................................................... B-4

Figure C-1 Figure C-2 Figure C-3 Figure C-4 Figure C-5

Typical FOM-20 X.21B Application ............................................................................. C-1 FOM-20 Rear Panel with X.21B Connector ................................................................. C-1 Jumper JP2 Location in the IR-X.21B Interface Module................................................ C-3 EXT Mode Timing Block ..............................................................................................C-4 INT/RCV Mode Timing Block ...................................................................................... C-4

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Table of Contents

List of Tables Table 2-1 FOM-20 Strap Selection................................................................................................ 2-5 Table 2-2 Async Character Length Setting..................................................................................... 2-6 Table 3-1 FOM-20 Front Panel, Controls and Indicators ............................................................... 3-2 Table A-1 DB-25 and RJ-45 Pin Assignment for IR-ETH Connection ............................................. A-3 Table A-2 DIP Switches Settings.................................................................................................... A-5 Table A-3 IR-ETH Bridge LED Indicators ....................................................................................... A-5 Table C-1 IR-X.21B DB-15 (RS-422) Connector Pin Assignment.................................................... C-2 Table D-1 Interface Signal List (Female Connectors), Pins and Standard Signal Names ..................D-1 Table E-1 Interface List for Connecting FOM-20 (RS-530) to V.36 DTE (RS-422)........................... E-1

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Chapter 1 Introduction This chapter:

•

Provides a general introduction to the FOM-20 modem, its versions and various modem options.

•

Gives a short physical description of the modem.

•

Lists the detailed specifications for the unit.

1.1 Overview General

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FOM-20 is a fiber optic modem that provides a secure, long range data link between computers, routers, multiplexers and other data communication (DTE) devices at output power ranges from 12 to 18 dB. FOM-20 operates either half or full duplex over sixteen selectable synchronous/asynchronous data rates from 19.2 kbps to 256 kbps enabling transmission up to 70 km (140 km over laser diode). FOM-20 uses an infrared light emitting diode or a laser to convert electrical signals into optical signals. The optical signal is converted back into an electrical signal in compliance with the appropriate interface on the receive end. Transmit clock timing is provided either internally, derived externally from the DTE, or recovered from the receive signal. FOM-20 features V.54 diagnostic capabilities for performing local analog and local and remote digital loopbacks. FOM-20 is available with six DTE interface options.

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FOM-20 Installation & Operation Manual

Chapter 1. Introduction

Applications

The following diagrams illustrate the integration of the FOM-20 in a variety of practical configurations:

•

Point-to-point application (see Figure 1-1): Two FOM-20 units are connected by a single mode fiber (up to 70 km). Each unit is connected to a workstation or an AS-400 system. Fiber Optic Up to 70 km

19.2 - 256 kbps

FOM-20

Figure 1-1 Point-to-Point Application

•

V.24

Tail-end application, for digital networks (see Figure 1-2): An AS-400 system is connected to a FOM-20 unit by a V.24 protocol. Another FOM-20 unit connects to the first FOM-20 over a G.703 link and attaches to a digital service network. One FOM-20 is synchronized by an external clock; the other by the RCV clock. On the other end, a workstation is connected to a FOM-20 by V.24 protocol.

G.703 Codirectional

FOM-20 RCV CLK

G.703 Codirectional

FOM-20 EXT CLK

Digital Service Network

FOM-20 EXT CLK

V.24

FOM-20 RCV CLK AS-400

Figure 1-2 Tail End for Digital Network Application

•

G.703 modem link application (see Figure 1-3). Two FOM-20 units are connected between a workstation and a network node over a G.703 modem link.

64 kbps G.703 Codirectional Mux or Network

X.21B/ RS-530/ V.24 FOM-20

FOM-20

Figure 1-3 Extension of G-703 Codirectional Network

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FOM-20 Installation & Operation Manual

Versions

Chapter 1. Introduction

FOM-20 is available as a standalone unit or as a card (FOM-20/R) for use in the ASM-MN-214 19" card cage. The standalone unit is supplied in a compact case that can be mounted on a desktop or shelf or mounted in a 19-inch rack FOM-20/R is the card version to be used in the ASM-MN-214, 19-inch modem rack. (The ASM-MN-214 rack can accommodate up to 14 cards.) FOM-20 can be ordered with a wide selection of optical interfaces and power supply voltages. A 115/230VAC, or -48 VDC power supply is needed to operate FOM-20. FOM-20 can be ordered with different light sources (Light Emitting Diode or Injection Laser diode) and different DTE interfaces. The type of light source and fiber optic used determine the maximum transmission range.

Features

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Fiber Optics FOM-20's fiber optic technology permits high immunity against electrical interference such as EMI, RFI, spikes and differential ground loops; protection from sparking and lightning and a secure link in hazardous or hostile environments; point-to-point data links at ranges longer than a conventional copper wire modem over noisy environments; high data security, minimizing the risk of eavesdropping. Interfaces Six DTE interface options are available: RS-232/V.24 (up to 64 kbps), V.35, built-in Ethernet bridge, RS-530, X.21B and G.703 (64 kbps codirectional). Connection to an RS-449/V.36 interface is accomplished via the RS-530 interface (see Appendix D). Timing FOM-20 receives clock timing from three variable sources: Internal, External or Receive clock. FOM-20 utilizes a phase locked loop (PLL) circuit to recover jitter-free data and clock sync from the optical signal. Test and Diagnostic Capabilities FOM-20 features V.54 diagnostic capabilities for performing local analog and local and remote digital loopbacks.

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Chapter 1. Introduction

1.2 Physical Description FOM-20 is a compact unit, intended for installation on desktops or shelves. The unit height is 4.4 cm (1.7") (see Figure 1-4). An optional rack-mount adapter kit enables FOM-20 installation into a 19-inch rack. Figure 1-4 shows a 3D view of FOM-20.

Figure 1-4 FOM-20 Front View

Front Panel

All controls (push button switches) and LED indicators are located on the front panel of FOM-20. Front panel indicators and controls are described in greater detail in Chapter 3, Operation.

Rear Panel

All input/output connectors and power connections are accessed on the rear panel of FOM-20. The AC power connector has an integrated fuse holder. The correct rating of the replaceable fuse is printed on the rear panel of FOM-20. FOM-20's rear panel is described in greater detail in Chapter 2, Installation.

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FOM-20 Installation & Operation Manual

Chapter 1. Introduction

1.3 Functional Description General

This section describes the functional circuitry of the FOM-20 fiber-optic modem (see Figure 1-4). FOM-20 uses an infrared light emitting diode or a laser, to convert electrical signals into optical signals. The optical signal is converted back into an electrical signal in compliance with the appropriate interface on the receive end.

Interface

Six DTE interface options are available: RS-232/V.24 (up to 64 kbps), V.35, built-in Ethernet bridge, RS-530, X.21B and G.703 (64 kbps codirectional). Connection to an RS-449/V.36 interface is accomplished via the RS-530 interface (see Appendix D).

Timing

The modulation timing circuit supplies the transmit clock timing signal to the encoder. Three clock sources are available:

•

Internal Clock (INT) - from the modem’s internal crystal oscillator

•

External Clock (EXT) - from the DTE

•

Receive Loopback Clock (RCV) - recovered from the receive signal, looped back as a transmit clock.

FOM-20 utilizes a phase locked loop (PLL) circuit to recover jitter-free data and clock sync from the optical signal. X.21B Buffer (for X.21B Interface) An external clock input is available for the X.21B interface by using pins on the DB-15 connector (pins 7 and 14). To allow for the tail-end connection of an X-21B interface, a buffer is provided on the received data. When FOM-20 works in external clock mode (EXT), jumper X.21B EX.CK is set to EXT. When internal (INT) or receive (RCV) clock mode is chosen, the X.21B jumper is set to INT.

Async-to-Sync Converter

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FOM-20 has an internal Async-to-Sync converter. Asynchronous transmission is handled by the internal conversion of the data signal from asynchronous to synchronous (in compliance with ITU V.22 bis). For this standard, the modem compensates for any frequency deviation between the modem and the DTE by adjusting the length of the stop bit of the async character. The operation mode of the Async-to-Sync converter is chosen by setting the proper character length and frequency deviation (via dipswitch bank).

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FOM-20 Installation & Operation Manual

Chapter 1. Introduction

Diagnostics

Built-in diagnostics (complying with the V.54 standard) enable digital loopback, remote and local analog loopback. Diagnostics are activated either from the front panel push buttons or via the DTE interface. The push buttons and the DTE interface are enabled (or disabled) by the SW EN, REM and ANA straps on the printed board. Test Pattern Generator and Receiver The pattern generator/receiver provides for the testing of the local modem and the communication link. When the PATT button on the front panel is pressed, the pattern generator circuit sends out a standard 511-bit pseudo-random pattern. If any errors are encountered, the ERROR LED lights up. Tests can be carried out from the remote FOM-20 by pressing the PATT push button on the remote unit or by connecting a Bit Error Rate Tester, which uses the standard 511-bit pattern. CTS DELAY

CTS RTS

DEVIATION

LENGTH

RTS REM PATT

REM PATT ANA EN/DIS

CDP ENCODER

PATT GENER ASY

INT/EXT/ RCV

SW EN/DIS

DIG INTERN CK16 TIMING INTCK

TEST

PATT

TEST

EXTCK RXC

V54 DELAY DIS

SYNC TO ASYNC

RXD

X21 INT

X21 FIFO

~220 VAC ~115 VAC48 VDC ~100 VAC

POWER +5 VDC -5 VDC

XMT TIMING

BERT

ERR

CDP TO F/O

ANA

TXC

DIG

0/9/70

XMT CLK

ANA

ANA REM

CARRIER

RTS-CTS DLY

ASYNC TO SYNC

TXD REM

CNTRL/ON

12.5%, 25%

8,9,10,11 BITS

CLOCK RECOVERY

RLB DECODER

V54 DELAY

CDP DECODER

PWR

F/O TO CDP

CARR DETECT DCD

Figure 1-5 FOM-20 Block Diagram

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FOM-20 Installation & Operation Manual

Chapter 1. Introduction

1.4 Technical Specifications Electrical Interface Transmission Rates:

Optical Interface

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Note

Asynchronous

19.2, 28.8, 38.4, 57.6, and 115.2 kbps

Synchronous

19.2, 32, 48, 56, 64, 72, 96, 112, 128, 144, 192, and 256 kbps

Connectors

V.24 via 25-pin D-type, female V.35 via 34-pin, female V.36/RS-449 via 37-pin D-type node using a cable adapter RS-530 via 25-pin D-type, female X.21B via 15-pin D-type, female Built-in Ethernet bridge via RJ-45 (10BT) or BNC (C10-32) connectors G.703 Codirectional via terminal block or RJ-45 connector

Operating Wavelength 850 nm for multimode fiber 1300 nm for single mode fiber 1300 nm for single mode fiber using laser diode (for extended range) 1550 nm for single mode fiber using laser diode (for extended range) Transmission Line

Dual fiber optic cable

Budget (Max)

-18 dBm for 850 nm; 62.5/125 fiber -18 dBm for 1300 nm; 9/125, 62.5/125 (LED) fiber -13 dBm for laser diode; (1300/1550 nm) 9/125 fiber

Receiver Sensitivity

-48 dBm for 850 nm (LED) -50 dBm for 1300 and 1550 nm (laser diode)

Dynamic Range

36 dB

The ranges specified above were calculated according to the following typical attenuation rates (with a 3 dBm margin): 3.5 dB/km for 850 nm multimode 0.4 dB/km for 1300 nm single mode 0.25 dB/km for 1550 nm single mode. Connectors Transmitter

SMA, ST, SC or FC-PC LED or laser

Maximum Range

850 nm (multimode) up to 7 km 1300 nm (Single mode - LED) up to 70 km 1300 nm (Single mode - laser diode) up to 85 km 1550 nm (Single mode - laser diode) up to 140 km

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FOM-20 Installation & Operation Manual

Chapter 1. Introduction

Diagnostics

Digital Loopback

Analog Loopback

Local - activated by front panel switch (DIG) Remote - activated by front panel switch (REM) or by the DTE interface signals (V.35/RS-530 and V.24/RS-232) Local - activated by front panel switch (ANA) or by DTE interface signal (excluding X.21B and G.703)

Test Pattern

Activated by front panel switch (PATT)

Timing Elements

Receive Clock Transmit Clock

Derived from the Receive signal Derived from three alternative sources: 1. Internal oscillator (INT) 2. External - from the DTE (EXT) 3. Received from receive signal, looped back as transmit clock (RCV)

Indicators

Transmit Data

Receive Data

RTS

Request to Send

DCD

Data Carrier Detect

ERR BER

Test Error

PWR

Power

TEST

Loopback mode or BER

Power Supply

Physical

Environment

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Voltage

100, 115 or 230 VAC (±10%), or 48 VDC (±20%),

AC Frequency

47 to 63 Hz

Power

5 VA

FOM-20 Standalone

Height: Width: Depth: Weight:

FOM-20/R Rack-Mount Card

Dimensions to fit ASM-MN-214 Rack Weight 360 g / 0.1 lb

Temperature

0-50°C / 32-122°F

Humidity

Up to 90%, non-condensing

4.4 cm 24 cm 19.3 cm 1.4 kg

/ 1.7 in / 9.6 in / 7.6 in / 3.1 lb

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Chapter 2 Installation and Setup This chapter provides mechanical and electrical installation procedures for FOM-20. If a problem is encountered, refer to Chapter 4 for troubleshooting instructions. FOM-20 is supplied as a fully assembled standalone unit or as a card version for the ASM-MN-214 rack. For instructions on installation of one or two units in a 19-inch rack, refer to the Rack Mounting Kit for 19-inch Racks guide that comes with the RM kit. In case a problem is encountered, refer to Chapter 4 for test and diagnostics instructions. Make sure the AC power cord is disconnected before removing the unit’s cover. Warning

HIGH VOLTAGE - Any adjustment, maintenance, and repair of the opened instrument under voltage should be thoroughly avoided and should be carried out only by an experienced technician who is aware of the hazard involved. Capacitors inside the instrument may remain charged even after the instrument has been disconnected from its power supply.

2.1 Site Requirements and Prerequisites Power

AC-powered FOM-20 units should be installed within 1.5m (5 ft) of an easily accessible, grounded AC outlet capable of furnishing the required supply voltage of the unit (100, 115, 230 VAC). In order to prevent a fire hazard, the (negative) supply line must contain a suitable fuse or a circuit breaker. DC-powered FOM-20 units require a -48 VDC power source which must be adequately isolated from the mains supply. Allow at least 90 cm (36 in) of frontal clearance for operating and maintenance accessibility. Allow at least 10 cm (4 in) clearance at the rear of the unit for signal lines and interface cables.

Ambient Requirements

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The ambient operating temperature of FOM-20 is 0-50°C (32-122°F) at a relative humidity of up to 90%, non-condensing.

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Chapter2. Installation

2.2 Package Contents FOM-20

The package of the standalone FOM-20 modem includes: AC version: • FOM-20 unit • AC power cord • FOM-20 Installation and Operation Manual DC version: • FOM-20 unit (protected by adequate cushioning) • DC power supply connector kit • FOM-20 Installation and Operation Manual

FOM-20/R

The package of the card version of the FOM-20 modem includes: • FOM-20/R • FOM-20 Installation and Operation Manual If any part is missing or defective, notify your RAD technical support representative.

2.3 Installation and Setup Perform the following steps to correctly install the FOM-20: For mounting the FOM-20/R (Card version) in an equipment rack, follow the instructions in Chapter 5, Card Cage Version.

Setting the Internal Jumpers and Switches

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Before installing the FOM-20, set the jumpers/switches according to the intended configuration. The jumper/switch locations are shown on the board layout diagram, as shown in Figure 2-1 and are listed in Table 2-1.

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Access to the inside of the equipment is permitted only to authorized and qualified service personnel. Warning

To avoid accidental electric shock, always disconnect the interface cables and the power cord before removing the unit from its casing. Line voltages are present inside FOM-20 when it is connected to power and/or to the lines. Moreover, under external fault conditions dangerous voltages may appear on the lines connected to the unit. Any adjustment, maintenance, and repair of the opened instrument under voltage should be avoided as much as possible and, when inevitable, should be carried out only by a skilled technician who is aware of the hazard involved. Capacitors inside the instrument may remain charged even after the instrument has been disconnected from its power supply source.

➤ To open the FOM-20 case: 1.

Disconnect the power cord from the mains outlet.

Release the two rear panel screws and use them as levers to slide out the PCB interior of the unit.

➤ To set switches and jumpers: 1.

Identify the switches according to the configuration diagram (Figure 2-1) (for FOM-20/R refer to Figure 5-4 in Chapter 5).

Set the switches for the desired operation (see Table 2-1).

Replace the FOM-20 PCB interior.

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OFF LN0

Installation and Setup

Ph:727-398-5252/Fax:727-397-9610 ON

1 ON

OFF

BIT 8 9 10 11 12 25

2 3 4 5

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 0 - 256

BAUD RATE kbps

0 1 EF D C B A 9 8 7

SW. EN.

OFF LN1 LN1 OFF OFF ON ON

OFF STOP BIT

2 ON

LN0 OFF ON OFF ON

3 ON

RTS-CTS DLY (ms)

0 9 70

INT EXT RCV ASY

XMT CLK

CNTRL

SW2

CARRIER

DIS

SW3 STOP %

V54 DIS

ALB DTE

DIS

RLB DTE

DIS

CON

CHASS

Chapter2. Installation FOM-20 Installation & Operation Manual

J14

Figure 2-1 FOM-20 Main Board Layout

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FOM-20 Installation & Operation Manual

Chapter2. Installation

Table 2-1 FOM-20 Strap Selection Strap Identity

Function

Possible Settings

Factory Setting

J1 V54 DIS

Enables or disables DIG.LOOP from remote pattern

EN DIS

J2 CARRIER

Selects the transmit carrier mode. When “ON”, transmit carrier is constantly “ON”. When “CNT”, transmit carrier is “ON” only when RTS is high.

ON CNTRL

J3 XMT CLK

Selects the transmit timing signal from either: internal clock, external clock or receive clock.*

EXT INT RCV ASY

J4 RTS-CTS DLY (ms)

Selects the delay time (in ms) between RTS and CTS.

0 9 70

J6 SW EN

Enables activation of PATT, REM, ANA, DIG push buttons on the front panel

ON OFF

J7 RLB DTE

Enables RLB test from the DTE interface pins.

EN DIS

DIS

J8 ALB DTE

Enables LLB test from the DTE interface pins.

EN DIS

DIS

J14 CHASS (Chassis Ground)

In CON position, signal ground is connected to chassis ground. In DIS position, the signal ground is isolated from the chassis ground.

CON DIS

SW3 BAUD RATE (kbps)

Selects the data rate.

19.2, 28.8, 32, 38.4, 48, 56, 57.6, 64, 72, 96, 112, 115.2, 128, 144, 192, 256

INT

9 ms ON

CON

In asynchronous operation (refer to Table 2-2 for async characters length settings): SW2 LN0, LN1

Selects the character length

8 bit 10 bit 9 bit 11 bit

SW2 STOP BIT

Selects the frequency deviation setting

12 25

10 bit 12

* When two FOM-20 modems are used, one modem should be configured as RCV clock and the other as INT or EXT clock.

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Table 2-2 Async Character Length Setting Start Bit

Data Bits

Parity

Stop Bit

No. of Bits

NONE

1, 1.5, 2

8 9

ODD, EVEN

1, 1.5, 2

9 10

NONE

1, 1.5, 2

9 10

ODD, EVEN

1, 1.5, 2

10 11

NONE

1, 1.5, 2

10 11

ODD, EVEN

1, 1.5, 2

➤ To return FOM-20 to its case:

Connecting the Interfaces

Slide the PCB interior back into the case.

Screw in the two rear panel screws to fasten the PCB in the case.

Figure 2-2 shows rear panels of FOM-20 standalone unit. The rear panel of the FOM-20/Standalone contains an AC, or DC, input power connector; a DTE interface connector; and TX and RX fiber optic connectors. DTE

~230V/

0.1A T 250V

Figure 2-2 FOM-20/Standalone Rear Panel (AC-Powered Version) Connecting the Fiber Optic Cables Two fiber optic connectors are located on the rear panel and marked TX and RX. ➤ To connect the fiber optic cables:

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Remove the protective caps from the connectors and store them in a safe place for later use.

Connect the transmit fiber to the connector marked TX and the receive fiber to the connector marked RX.

At the remote unit connect the transmit fiber to RX and the receive fiber to TX.

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Connecting the DTE

Note

RAD recommends using a shielded twisted pair cable between FOM-20 and the DTE (mainly for higher frequencies). The line receivers in FOM-20 are 100 Ω terminated (for X.21B and RS-530). For all DTE interface connections except G.703:

•

Press the end of the connector into the DTE interface connection on FOM-20.

For more information on a particular DTE interface, see the appropriate appendix in this manual. If problems arise when connecting to the DTE interface, first check that the DTE interface is properly terminated.

G.703 Connection On the FOM-20/Standalone - G.703 version, connect the data wires to the terminal block. 1.

Strip off about 1 cm of insulation from the wire end and twist the loose wire ends together.

Insert a screwdriver into the square upper hole on the terminal block.

Raise the handle of the screwdriver to open the round lower hole.

Insert the stripped end of the wire into the round lower hole and then remove the screwdriver.

For safety reasons, it is advisable to connect the CHASSIS GND to the SIGNAL GND when using the G.703 interface.

Warning

Connecting the Power

Warning

To connect the power to FOM-20, refer to the appropriate section below, depending on your version of the unit (DC or AC). The unit has no power switch. Operation starts when power is applied to the rear panel POWER connector. When applying power, first connect the plug of the power cord to the FOM-20 POWER connector and then to the mains power source (outlet).

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Before switching on this instrument, connect the protective earth terminals of this instrument to the protective conductor of the Grounding (mains) power cord. Insert the mains plug only into a socket outlet with a protective earth contact. Only use an extension cord (power cord) with a protective conductor (grounding). Replace fuses only with fuses of the same current and voltage rating as indicated on the unit. Do not short-circuit fuse holders. Whenever it is likely that the protection offered by fuses has been impaired, the instrument must be made inoperative and secured against any unintended operation. For your protection, FOM-20 must always be grounded. Any interruption of the protective (grounding) conductor (inside or outside the instrument) or disconnection of the protective earth terminal can render this instrument dangerous. Intentional interruption is prohibited. AC Power Connection AC power should be supplied to FOM-20 through the 5 ft (1.5m) standard power cable terminated by a standard 3-prong plug (see Figure 2-2). The cable is provided with the unit. ➤ To connect AC power to FOM-20:

•

Connect the power cable to the connector on the FOM-20 rear panel and then to the mains outlet. The unit turns on automatically upon connection to the mains.

DC Power Connection ➤ To connect DC power to FOM-20:

•

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Refer to DC Power Supply Connection Supplement.

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Chapter 3 Operation This chapter:

•

Describes the FOM-20 modem controls and indicators and their functions.

•

Explains how to operate the FOM-20.

3.1 General This chapter describes FOM-20 controls and indicators and their functions, explains the operating procedures, and supplies instructions for making changes in field strapping. All of the installation procedures given in Chapter 2 must be completed and checked before attempting to operate FOM-20.

3.2 Front Panel Controls and Indicators All pushbutton switches and LED indicators are located on the FOM-20 front panel, as seen in Figure 3-1. Their functions are described in Table 3-1. The numbers under the heading “Item No.” in the table correspond to the identification numbers shown in the figure.

FOM-20 PWR

RTS

DCD

TEST

ERR

DIG

ANA

REM

PATT

Figure 3-1 FOM-20 Front Panel

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Chapter 3 Operation

Table 3-1 FOM-20 Front Panel, Controls and Indicators Item No.

Name

Type

Function

PWR

Green LED

On when the Power is on.

RTS

Yellow LED

On when the terminal activates Request to Send.

Note:

The CARRIER jumper should be set to ON; if set to CNTRL, the RTS signal should be high.

Yellow LED

On when steady SPACE is being transmitted. Flickers when data is being transmitted.

Yellow LED

On when steady SPACE is being received. Flickers when data is being received.

DCD

Yellow LED

On when a valid receive signal is present.

TEST

Red LED

On when the FOM-20 is in a loopback mode or when the PATT switch is pressed.

ERR

Red LED

On when the alarm buffer is not empty. Flickers whenever an error is detected in BER tests.

DIG

Push button

The DIG (Digital) loopback switch causes the local FOM-20 to loop the received data back to its transmitter (see Figure 4-3).

ANA

Push button

The ANA (Analog) loopback (V.54 Loop 3) switch causes the local FOM-20 to loop its transmitter output back to its receiver (see Figure 4-1). This loopback may also be activated from the DTE when the LLB strap is set to EN.

REM

Push button

The REM (Remote) digital loopback (V.54 Loop 2) switch causes the remote FOM-20 to loop received data and clock signal back to its transmitter (see Figure 4-2). This loopback may also be activated from the DTE when the RLB strap is set to EN.

PATT

Push button

The PATT (Pattern) switch causes FOM-20 to send and receive a 511 test pattern. If errors are encountered, the ERROR LED lights up or blinks.

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Chapter 3 Operation

3.3 Initial Operation and Basic Checks Power-on Procedure Note

Running Self Test

FOM-20 is turned on as soon as power is connected. When power is connected, the POWER indicator lights up and remains lit as long as FOM-20 receives power. Check first that none of the front panel pushbuttons are pressed (down). ➤ Verify that FOM-20 is functioning properly by running the following tests. 1.

Press the ANA switch on the front panel to the On position (down).

Press the PATT pushbutton. Check that the:

•

DCD lamp lights up

•

TEST lamp lights up

•

RD lamp turns off

•

ERR lamp turns off.

If the test executes correctly, restore all the push buttons to their previous settings. If the test does not execute properly, refer to Chapter 4, Troubleshooting and Diagnostics.

Running BER Test ➤ To check the link between the two DTEs:

•

Press the PATT pushbutton on the front panel of FOM-20.

If any errors are encountered, the SQ LED will dim continuously (for continuous errors) or blink (for intermittent errors). Refer to Chapter 4, Troubleshooting and Diagnostics for more help.

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Chapter 3 Operation

3.4 Operating Instructions FOM-20 operates unattended after installation. For more information, see Chapter 2, Installation. Operator intervention is required when either:

•

FOM-20 must be adapted for a new operating mode.

•

Diagnostic loops are required.

Changing Field Strapping

If it is necessary to reconfigure FOM-20 for a different mode of operation, follow the procedures described in Chapter 2, Installation, for changing jumper/switch settings.

Running Diagnostic Loops

Refer to Chapter 4, Troubleshooting and Diagnostics for more information on running diagnostic loops.

Power-off Procedure

To power down FOM-20, remove the AC or DC power cord from the AC or DC mains supply.

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Chapter 4 Troubleshooting & Diagnostics This chapter contains:

•

Description of the ITU V.54 diagnostic capabilities for performing local analog loopbacks and local and remote digital loopbacks.

•

Description of the internal BERT circuitry and tests used to verify normal system operation.

•

Procedures for performing analog loopback diagnostic tests using the built-in BER tester (with pattern generator).

•

Procedures for checking the quality of the communication link between FOM-20 modems.

4.1 General Test Pattern Generator and Receiver The pattern generator/receiver provides for the testing of the local modem and the communication link. When the PATT button on the front panel is pressed, the pattern generator circuit sends out a standard 511-bit pseudo-random pattern. If any errors are encountered, the ERROR LED lights up. 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-20 modem (by pressing the PATT push button on the remote unit or by connecting a Bit Error Rate Tester, which uses the standard 511-bit pattern). FOM-20 supports several types of tests for evaluating the operation of the data equipment, FOM-20 and its line circuits.

•

Loopbacks: test the communication between the data equipment and the internal circuitry of both local and remote modems.

•

BERT circuit: consist of a pattern generator and a pattern tester, and work in conjunction with the V.54 diagnostic loops and the remote BERT to verify normal system operation and identify faulty equipment in the event of system failure.

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FOM-20 Installation & Operation Manual

•

Analog Loopback: checks the performance of the local modem, the local data terminal equipment and the cables between them.

•

Communication Link: determines the performance of both the local and remote FOM-20 and of the link between the local and remote units.

Tests are activated by push buttons and monitored via LED indicators on the front panel of FOM-20. For a description of the FOM-20 controls and indicators and their functions, see Chapter 3, Operation.

4.2 Loopback Tests Loopback tests are best performed in the order presented in this section.

Note

Before running the loopback tests:

• Verify that the DTE is operating properly and can be used for the test. Do not perform any tests using faulty equipment. • Ensure that all units are powered ON and are configured correctly.

Local Test - Local Analog Loopback (LLB) Standard V.54

The Local Analog Loopback (LLB) test checks the performance of the local FOM-20, the local DTE, and the connections between them. The LLB test is performed separately at the local and at the remote site (see Figure 4-1). 1. Press the ANA push button on the front panel to activate the LLB loopback. 2. When LLB loopback is initiated, the TEST LED lights to indicate that the FOM-20 digital interface is now operationally connected to the adjacent DTE via most of the modem circuits. This test can also be activated via the appropriate pin on the digital interface.

Note

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Activation of an LLB via the appropriate pin on the digital interface is not available when using X.21B, G.703 or IR-ETH interfaces.

Loopback Tests

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ANA P.B. PRESSED

DATA CLK

XMTR

DATA TERMINAL EQUIPMENT

LINE INTERFACE CLK DATA

RCVR

FOM-20 Figure 4-1 Local FOM-20 in Analog Loopback (LLB) If a fault is detected, repeat the LLB test using external BERT equipment. If the BERT test indicates an error-free data stream, but the test using DTE indicates a fault, verify that the cable between the DTE and the FOM-20 is not faulty or improperly connected. If the problem persists, follow the DTE manufacturer’s test procedures to isolate the fault. To identify a problem in the communication line, perform the LLB loopback at the remote end of the line. If both LLB tests are error-free, the fault is in the communication link or in the line interfaces. After completing the test or correcting the fault, return the ANA push button to the OFF (up) position:

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Remote Digital Loopback (RLB) Standard V.54

The Remote Digital Loopback (RLB) test determines the performance of the local and the remote FOM-20 units as well as their interconnecting lines. The Remote Digital Loopback sets a loop at the remote FOM-20 modem from the terminal coupled to the local unit (see Figure 4-2). REM P.B. PRESSED

DATA CLK

RCVR

XMTR

LOCAL DTE

Line Interface CLK DATA

REMOTE DTE

Line Interface

XMTR

RCVR

LOCAL FOM-20

REMOTE FOM-20

Figure 4-2 FOM-20 in Remote Digital Loopback (RLB) To perform the test, proceed as follows: Press the REM push button on the front panel to activate the RLB loopback. This test causes the TEST LED to light on the front panel of both local and remote modems. This test can also be activated via the appropriate pin on the digital interface.

Note

Activation of an RLB loopback via the appropriate pin on the digital interface is not available when using X.21B, G.703 or IR-ETH interfaces. If the RLB test indicates a fault, but the LLB test (see above) was successful in both local and remote modems, then the line or line circuits on one side of the line are not functioning properly.

Local Digital Loopback (DIG) Non-Standard

This test loops the received data back to the remote FOM-20, as shown in Figure 4-3. The operator at the remote end uses this test to determine the performance of the local and remote FOM-20 units and the communication link. Press the DIG push button on the front panel to initiate the test.

Note

Confirm first that the timing (clock) strap is set to RCV. The Local Digital Loopback test is equivalent to activating the remote loopback from a remote FOM-20.

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DIG Push Button Pressed

RCVR

XMTR

LOCAL DTE

Line Interface

DATA CLK

REMOTE DTE

Line Interface DATA XMTR

RCVR

LOCAL FOM-20

CLK

REMOTE FOM-20

Figure 4-3 Activation of RLB at the Remote Modem (Local FOM-20 in a Digital Loopback)

4.3 Internal BERT Circuit Test FOM-20 has a built-in BERT circuit, consisting of a pattern generator and a pattern tester. This circuit works in conjunction with the V.54 diagnostic loops and the remote BERT to verify normal system operation and identify faulty equipment in the event of system failure. The pattern transmitted is a RAD-proprietary, psuedo-random pattern. The pattern transmitted by the BERT can be received by another FOM-20 modem (a two-BERT test) or looped back to the BERT for comparison (modem self-test). When used opposite another FOM-20, the complete link can be tested either with the PATT push button pressed, or with an external BERT transmitting the same 511-bit pattern (per V.52).

Modem Self-Test

This test verifies that the modem is operating correctly (see Figure 4-4). ➤ To perform the test , proceed as follows: 1.

Note:

Press the ANA push button on the front panel. The TEST and DCD LEDs will light up.

If the DCD LED does not light up, verify that the CARRIER jumper is set to ON, or that the RTS signal is High. 2.

Press the PATT push button. Verify that: •

DCD TEST and RTS LEDs light up

•

RD LED is Off

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•

ERR LED is Off

If errors are encountered, the ERR LED lights (for continuous errors) or blinks (for intermittent errors), the FOM-20 unit is faulty and should be replaced. If the test executes correctly, restore all push buttons and jumpers to their normal position. PATT Push Button Pressed

ANA Push Button Pressed

PATTERN GENERATOR

XMTR

PATTERN TESTER

RCVR

ERR

FOM-20 Figure 4-4 FOM-20 Self-Test

Two-BERT Test

The Two-BERT test (see Figure 4-5) checks the link between the two DTEs. ➤ To perform the test, proceed as follows: 1. Press the PATT push button on the front panel. If errors are encountered, the SQ LED will go Off (for continuous errors) or blink (for intermittent errors).

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PATT Push Button Pressed (Disconnects External DTE)

DATA FLOW

PATTERN GENERATOR

PATTERN TESTER Line Interface

ERR

Line Interface PATTERN GENERATOR

PATTERN TESTER

DATA FLOW FOM-20

FOM-20

Figure 4-5 FOM-20 BER System Test (Two-BERT Test)

4.4 (Local) Analog Loopback Test This test checks the performance of the local modem, the local data terminal equipment and the cables between them. It is performed separately at the local and remote sites. 1.

Press the ANA push button on the front panel. (This test can also be activated via the pin on the DTE interface.) The TEST LED should light. The FOM-20 transmit output is now connected to its own receiver.

Verify that the data terminal equipment is operating properly and can be used for the test. If it is faulty, call a technician to replace the unit.

Execute the test using one of the following methods:

•

Use the DTE and check the echoed data stream.

•

Use an external Bit Error Rate Tester (BERT) unit.

•

Use the internal BERT. Press the PATT push button on the front panel; the TEST and RTS LEDs light constantly while the ERR LED lights briefly to indicate that the lamp is functioning. If a bit error is encountered, the LED blinks or remains lit.

Perform Step 3 at both ends.

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If BERT test equipment shows no fault, but the data terminal is faulty, follow the manufacturer’s test procedures for the data terminal. Check the cable connecting the DTE to FOM-20. 5. After completing the test (or when the fault has been corrected), reset the ANA push button to the OFF position (Up). Then perform the Communication Link Tests (see section 4.5).

Loopback Function

The Local Loopback command is activated by the DTE interface or by the push button on the front panel. FOM-20 sends “MARK” level or “OFF” state to the Transmit LED when the command “LLB” is activated, but the signal is directed only to the Receive input (see Figure 4-6). This is an internal test only, with no external transmission. At the far end, the remote FOM-20 functions as if it is in “Loss-of-Signal State”, which is DCD “OFF” and RX data “OFF” or “MARK”. ANA Push Button Pressed

DATA CLK

XMTR

DATA TERMINAL EQUIPMENT

LINE INTERFACE CLK DATA

RCVR

REMOTE FOM-20

Figure 4-6 Local Analog Loopback

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Chapter 4 Troubleshooting and Diagnostics

4.5 Communication Link Test Remote Digital Loopback

Local Digital Loopback

The remote digital loopback test determines the performance of both the local and remote FOM-20, and the quality of the link between the local and remote units. 1.

Press the REM push button on the front panel to provide a loopback at the remote FOM-20 (see Figure 4-2). (This test can also be activated via the pin on the DTE interface.) The TEST LED lights at both the local and remote units.

Perform the BERT test as explained in section 4.3.

If Step 2 indicates a fault, and if the modem test described in section 4.4 was successful for both the local and remote modems, the line circuits are not operating properly.

The test loops the received data back to the remote FOM-20. (This test is equivalent to activating remote loopback from the remote FOM-20, as seen in Figure 4-7). The operator at the remote end can determine the performance of the local and remote FOM-20 units and of the links between them. ➤ To activate this test, press the DIG push button on the front panel. DIG Push Button Pressed

REM Push Button Pressed

DATA CLK

RCVR

XMTR

LOCAL DTE

Line Interface CLK DATA

REMOTE DTE

Line Interface

XMTR

RCVR

REMOTE FOM-20

LOCAL FOM-20

Figure 4-7 Local FOM-20 in Digital Loopback

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Chapter 4 Troubleshooting and Diagnostics

FOM-20 Installation & Operation Manual

4.6 Troubleshooting Instructions Problem When a FOM-20 unit is powered up and its RCV fiber optic connector is exposed (cap is removed and fiber optic line is not connected), the DCD and RD indicators may flicker. Solution The flickering may occur due to the high sensitivity of the modem's receive circuits. Connect FOM-20 to the fiber optic line or replace the RCV connector cap.

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Chapter 5 Card Cage Version This chapter:

•

Gives a description of the ASM-MN-214 card cage and power supplies.

•

Describes the FOM-20/R - card version.

•

Explains how to install the FOM-20 in the ASM-MN-214 card cage and operate the unit.

5.1 ASM-MN-214 Card Cage The ASM-MN-214 card cage holds up to 14 plug-in cards and one or two power supplies. The card types can be the FOM-20/R or other RAD rack version modems (any combination of up to 14 plug-in cards). On the rear panel, behind each card mounting slot (see Figure 5-1) is a snap-on connector five-screw terminal block and a DB-25 connector. The terminal block contains screws to connect the transmit and receive fiber optic pairs (and ground, if present). The transmit pair is connected to the terminal marked XMT, the receive pair - to the terminal marked RCV. The fifth screw is a terminal for an optional ground connection. The 25-pin D-type female interface connector provides all interface signals for the digital interfaces. Modems with X.21 or V.35 interface require an external mechanical adapter. Two optional interface attachments, CIA/V.35/1 and CIA/X.21, can be ordered separately from RAD. CIA/X.21 converts two adjacent DB-25 connectors to two X.21 15-pin connectors. CIA/V.35/1 converts one DB-25 connector to a V.35 34-pin connector. To convert the DB-25 connector to a V.36 37-pin connector, an optional RAD adapter cable (CBL 530/449/F) can be ordered separately. The adapter cable and two interface attachments are also shown in Figure 5-1.

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Chapter 5 Card Cage Version

Terminal Block

CIA/V.35/1

Protection Cover CIA/X.21

Figure 5-1 ASM-MN-214 Cage, Rear View

5.2 FOM-20/R Card Version The FOM-20/R is a rack version of the FOM-20. LED indicators and test switches are conveniently located on the front panel, as shown in Figure 5-2, enabling simple fiber optic connections and easily-accessible LED indicators and switches. Chapter 2 explains how to configure the FOM-20 jumpers. Chapter 3 gives information on how to operate the FOM-20 card version.

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Chapter 5 Card Cage Version

PWR TD

PWR RD

RTS

DCD

TEST

ERR

DIG ANA REM PATT

FOM-20

Figure 5-2 FOM-20/R, Front Panel Features

5.3 Power Supply The ASM-MN-214 card cage can accomodate both AC and DC power supplies. A LED indicator located on the front panel of the ASM-MN-214 (see Figure 5-3) show when each power supply is operating. The power supply can support a full set of 14 cards, in any combination. The FOM-20/R card is powered from the power supply via the ASM-MN-214 chassis. Each FOM-20/R card has two fuses to protect the system against power failure due to a short circuit in any card. Note

An AC and a DC power supply can be used together in the same cage.

AC Supply (100, 115 or 230 VAC)

The AC power supply of the ASN-MN-214 accepts 100, 115 or 230 VAC, ±10% (47 to 63 Hz) input AC current.

DC Supply (-48 VDC)

The DC power supply accepts from -36 to -72 VDC at its input. It uses a DC/DC converter module to supply the DC output power required for the cards.

Power Supply with Redundancy

This special ordering option gives the card cage two separate power supplies, which operate together to share the load of the entire card cage. If either power supplies fail, the other continues supplying DC power to drive the cards. A LED indicator on each power supply shows when mains power is provided.

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Chapter 5 Card Cage Version

Figure 5-3 ASM-MN-214 Front Panel

5.4 Installation Jumper Settings

Follow the jumper setup procedures listed in Table 2.1 (see Figure 5-4 for the FOM-20/R card layout diagram).

Mechanical Installation

After the ASM-MN-214 has been installed in the 19" equipment rack, insert each FOM-20/R card (or other modem type) into the card cage. Push the bottom of each card firmly into the rack to ensure that it makes contact with the edge connector inside the rack, and then tighten the screws on the top and on the bottom of each card.

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RX LED

TX LED

OFF

SW. EN.

J 6

RTS-CTS DLY (ms)

0 9 70

INT EXT RCV ASY

XMT CLK

CNTRL

CARRIER

DIS

V54 DIS

LN0 OFF ON OFF ON

SW 1

LN1 OFF OFF ON ON

1 2 3

BIT 8 9 10 11

STOP % 12 25

3 4 5

0 - 256 1 - 192 2 - 144 3 - 128 4 - 115.2 5 - 112 6 - 96 7 - 72 8 9 -- 64 57.6 A - 56 B - 48 C - 38.4 E - 28.8 0 -- 256 F 19.2

BAUD RATE kbps

0 1 EF D C B A 9 8 7

SW 3

EN DIS ALB DTE

RLB DTE EN DIS

CON DIS

CHASS

J14

FOM-20 Installation & Operation Manual Chapter 5 Card Cage Version

Figure 5-4 FOM-20/R Card, Layout Diagram

Installation

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Appendix A Ethernet Interface A.1 General Description IR-ETH is an interface module for RAD modems, used for converting the Ethernet (10BaseT or 10Base2) electrical levels to the modem TTL levels. It also converts the Ethernet protocol to HDLC to enable long-distance transmission and avoid the Ethernet collision limitation. IR-ETH includes an internal, self-learning Ethernet bridge, which enables a high performance link between two Ethernet segments at a low transmission rate. The low-speed HDLC transmission is sent over the link using the modem modulation technique. It is converted back to an Ethernet signal at the remote modem. Figure A-1 shows a typical application using an Ethernet interface bridge. Each modem is connected to an Ethernet network via the Ethernet Interface bridge.

Figure A-1

Ethernet Interface Typical Application

A.2 IR-ETH Connector Options Figures A-2 and A-3 show the rear panel of FOM-20 with the IR-ETH connector options. The IR-ETH connector for the FOM-20/R card (rack-mount version) is shown in Figure A-4.

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FOM-20 Installation & Operation Manual

Appendix A. Ethernet Interface

DTE

10BASE-T LINK

COLL

~230V/

0.1A T 250V

Figure A-2 FOM-20 Rear Panel with IR-ETH/UTP Connector Option

DTE RX COLL

10BASE-T

~230V/

0.1A T 250V

Figure A-3 FOM-20 Rear Panel with IR-ETH/BNC Connector Option

Figure A-4 IR-ETH Connector for the FOM-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. The pinouts of the DB-25 and RJ-45 connectors are given in Table A-1.

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FOM-20 Installation & Operation Manual

Appendix A. Ethernet Interface

Table A-1 DB-25 and RJ-45 Pin Assignment for IR-ETH Connection Signal

Pin DB-25

RJ-45

RCV (+)

RCV (-)

XMT (+)

XMT (-)

GND

A.3 Ethernet Bridge Specifications General

LAN

WAN

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LAN Table

10,000 addresses

Filtering and Forwarding

15,000 pps

Buffer

256 frames

Delay

1 frame

Standard

Conforms to IEEE 802.3/Ethernet

Data Rate

10 Mbps (20 Mbps 10BaseT FDX)

Connectors:

10BaseT (UTP): Shielded RJ-45 10Base2: BNC connector

Protocol:

HDLC

Data Rate

According to the modem transmission rate

A.4 Installation and Operation Figures A-5 and A-6 show the Ethernet bridge layout, the locations of the DIP switches, and the rear panel components for the UTP and the BNC versions, respectively.

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FOM-20 Installation & Operation Manual

Appendix A. Ethernet Interface

Figure A-5 Ethernet Bridge Layout (UTP Option)

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 do implement the crossover function internally while NICs and other devices do not).

Switch Settings

Set switches according to Table A-2.

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FOM-20 Installation & Operation Manual

Appendix A. Ethernet Interface

Table A-2 DIP Switches Settings Switch Number

Name

SQ/FD

ON: OFF:

Ethernet full-duplex mode Ethernet half-duplex mode

OFF

CMP

ON: OFF:

Strips padding bits inserted in 64-byte frame Transmits frames over WAN as is

FIL

ON: OFF:

Passes only frames destined for another LAN LAN filter; passes all frames transparently

(nc)

Note

LED Indicators

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Description

Default Setting

The SQ/FD switch is not used in the Ethernet bridge with the BNC connector option. Table A-3 lists the IR-ETH LED indicators and describes their functions. 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

ON when data is received from the Ethernet attached segment

Panel

Yellow

ON when data is transmitted from the modem to the Ethernet segment

Panel

Yellow

ERR D4

Bridge buffer overrun

On board

Red

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Appendix A. Ethernet Interface

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Appendix B G.703 Interface (64 kbps) B.1 General The IR-G.703 is an interface module for RAD modems used to convert 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.703 64 kbps codirectional signals, or into any other digital interface signal. The module is available in two versions: • Standalone version – fits into a standalone modem and is available with two types of physical connections: a terminal block or an RJ-45 connector (see Ordering Options). • Rack version – mounts in the rack and uses the edge connector for communication interface. The edge connector is hard-wired on the motherboard of the card cage to the DB-25 connector on the back plane of the card cage. Figure B-1 shows the rear panel of the FOM-20 with the IR-G.703 option. Figure B-2 illustrates the pinout of the different connectors. DTE G.703

GND RCV XMT ~230V/ 0.1A T 250V

Figure B-1 FOM-20/Standalone, Rear Panel with G.703 Terminal Block

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Appendix B G.703 Interface

Figure B-2 IR G.703 Connector Options

Note

In Figure B-2, 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 has two operation modes, EXT and INT/RCV, which are strap-selectable on the board. The selection is made by the JP1 jumper located in the module as shown in Figure B-3. The EXT mode is described in Section B.2. The INT/RCV mode is described in Section B.3.

Note

The G.703 interface strapping should be done according to the clock mode. For example, if the modem is in EXT mode, then JP1 should be set to the EXT position.

EXT INT/RCV

TERMINAL BLOCK OR RJ-45 IN THE STANDALONE VERSION

Figure B-3 Strap-Selectable Operation Modes (using Jumper JP1)

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General

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Appendix B G.703 Interface

B.2 EXT Mode This mode is used in tail-end applications, where system timing is provided by the G.703 network. The IR-G.703 module uses an internal buffer to compensate for any phase delay introduced into the system by the line delay between the two modems. The buffer is an 8-bit FIFO connected as shown in Figure B-4. This mode corresponds to the modem clock working in the EXT mode. MODEM A

MODEM B

IR-G.703 MODULE

TX DATA G.703 CO-DIRECTIONAL 64 KBPS NETWORK

CLOCK RECOVERY CLOCK OUT

DATA CLK

CLOCK RECOVERY

DATA

RX DATA

RX FIFO

TIMING SOURCE

FIFO

CLOCK IN

CLOCK RECOVERY

EXT CLOCK MODE

RCV CLOCK MODE

Figure B-4 EXT Mode Timing Block

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Appendix B G.703 Interface

B.3 INT/RCV Mode The INT/RCV mode is used in applications in which the G.703 codirectional 64 kbps equipment connected to the modem recovers the clock signal from the modem link. This operation mode is used mainly when the attached equipment has a G.703 codirectional interface, but is unable to produce clock signals. The module has an 8-bit FIFO buffer to compensate for any phase delay introduced by the G.703 device. Figure B-5 illustrates the buffer connection and the required application setup. This mode corresponds to the modem clock working in the INT/RCV mode. Additional clock modes are available provided that either the clock source is MODEM B or the clock is recovered by MODEM B from the DTE side. DTE SIDE

MODEM A

MODEM B

LINK SIDE

G.703 SIDE IR-G.703 MODULE

INT or RCV CLOCK MODE

DATA

CLOCK RECOVERY EXT or INT CLOCK MODE (DEPENDENT ON ATTACHED NETWORK)

CLOCK OUT

CLK

RX DATA FIFO

DATA

FIFO CLOCK IN

TX DATA

EQUIPMENT WITH G.703 INTERFACE

CLOCK RECOVERY

INT/RCV CLOCK MODE

Figure B-5 INT/RCV Mode Timing Block

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INT/RCV Mode

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Appendix C X.21B Interface C.1 General IR-X.21B is an interface module for RAD modems, which 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 C-1 shows a typical application of the FOM-20 standalone modem with the IR-X.21B interface module. X.21

Line

X.21 Network Local FOM-20

Remote FOM-20 DTE

Figure C-1 Typical FOM-20 X.21B Application

C.2 X.21B Connector

~230 VAC 1A T 250V

Figure C-2 shows the rear panel of a standalone FOM-20 with the X.21B connector option. DTE CAUTION : For continued protection against risk of fire, replace only with same type and rating of fuse.

X.21

Line Connector

Figure C-2 FOM-20 Rear Panel with X.21B Connector The FOM-20 modem rack version requires an additional adapter to connect between the DB-15 connector (on the X.21B equipment) to the DB-25 connector (on the ASM-MN-214 rack). The optional DB-15 attachment kit CIA/X.21B, can be ordered separately from RAD, and connects to the ASM-MN-214 rear rack panel.

Pin Assignment

Table C-1 shows the X.21B DB-15 connector pin assignment.

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Appendix C X.21B Interface

Table C-1 IR-X.21B DB-15 (RS-422) Connector Pin Assignment Pin

Function

Shield

Transmit signal A

Control A

Receive A

Indication A

Signal timing A

External Timing A

GND

Common

Transmit B

Control B

Receive B

Indication B

Signal Timing B

External Timing B

Chassis connection

C.3 IR-X.21B Interface Module The IR-X.21B interface module layout is shown in Figure C-3. The module has two operating modes, EXT and INT/RCV, which are strap-selectable. The selection is made using the JP2 jumper on the printed board in the module. The EXT mode is described in Section C.4. The INT/RCV mode is described in Section C.5.

Note

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The X.21B interface strapping should conform to the modem clock mode. For example, if the modem is in EXT mode, then JP2 should be set to the EXT position.

IR-X.21B Interface Module

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Appendix C X.21B Interface

JP2

EXT

INT/RCV clock setting

EXT clock setting

CONNECTOR DB-15

Figure C-3 Jumper JP2 Location in the IR-X.21B Interface Module

C.4 EXT Mode The EXT mode is used in X.21 network applications where the system timing is provided by the X.21 network. The IR-X.21B module has an internal buffer to compensate for phase delay produced in the system by the delay between the two modem lines. The buffer is a 16-bit FIFO connected as shown in Figure C-4. When the modem's clock mode is EXT, the JP2 jumper must be set to EXT (see Figure C-3).

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Appendix C X.21B Interface

IR-X.21B TXD

TXD (2, 9) Signal Timing

ETC

(6, 13)

MODEM

DTE

ETC

RXC

FIFO Buffer Rx

RXD

(7, 14) RXD (4, 11)

Figure C-4 EXT Mode Timing Block

C.5 INT/RCV Mode The INT/RCV 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.21 interface, but no ability to produce clock signals. The module has a 16-bit FIFO buffer to compensate for the phase delay introduced by the X.21 device. Figure C-5 illustrates the buffer connection and the required application setup. When the modem's clock mode is INT or RCV, the JP2 jumper must be set to INT/RCV (see Figure C-3). IR-X.21B TXD

TXD (2, 9) Signal Timing

TXC

(6, 13)

MODEM

DTE

RXC

RXD

FIFO Buffer Rx

RXD (4, 11)

Figure C-5 INT/RCV Mode Timing Block

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INT/RCV Mode

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Appendix D DTE Interface Signal Assignments Table D-1 Interface Signal List (Female Connectors), Pins and Standard Signal Names Signal Function

V.24/ RS-232, DB-25

V.35, 34-pin Pin

Circuit

RS-530, DB-25 Pin

Protective Ground

Frame101

Signal Ground

Signal102 GND

Transmitted Data

P S

TD(A)103 TD(B)103

Received Data

R T

RD(A)104 RD(B)104

Request to Send

RTS105

X.21B, DB-15

Circuit

SHIELD

Chassis ground. May be isolated from Signal Ground (refer to Table 2-1)

GND

Common Signal and DC power supply ground.

2 14

BA(A) BA(B)

2 9

TRANSMIT (A) TRANSMIT (B)

Serial digital data from DTE. The data transitions must occur on the rising edge of the transmit clock, in Sync applications.

3 BB 16

(A) BB(B)

4 11

RECEIVE (A) RECEIVE (B)

Serial digital data at the output of the modem receiver. The data transitions occur on the rising edge of the transmit clock, in sync applications.

4 19

CA(A) CA(B)

3 10

CONTROL (A) CONTROL (B)

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Description

A positive level to FOM-20 when data transmission is desired.

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Appendix D DTE Interface Signal Assignments

Table D-1 Interface Signal List (Female Connectors), Pins and Standard Signal Names (Cont.) Signal Function

V.24/ RS-232, DB-25

V.35, 34-pin Pin

Circuit

RS-530, DB-25 Pin

Circuit

X.21B, DB-15 Pin

Description

Circuit

Clear to Send

CTS106

5 13

CB(A) CB(B)

A positive level from FOM-20 with delay, after receipt of Request to Send, and when FOM-20 is ready to transmit.

Data Set Ready

DSR107

6 22

CC(A) CC(B)

A positive level from FOM-20 when the power is on, and FOM-20 is: - not in a DIGITAL LOOP mode, or - has not received a REMOTE LOOPBACK signal from the remote unit.

Data Terminal Ready

DTR108

20 23

CD(A) CD(B)

Carrier Detect

DCD109

8 10

CF(A) CF(B)

5 (A) 12

External Transmit Clock

19 16

Transmit Clock

14 10

U SCTE(A)113 W SCTE(B)113

Y A

SCT(A)114 SCT(B)114

24 11

15 12

DA (A) DA (B)

DB(A) DB(B)

7 (A) 14

6 13

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INDICATION INDICATION (B)

(B)

SIGNAL TIMING (A) SIGNAL TIMING (B)

A positive level from FOM-20, except when a loss of the received signal is detected or when Data Set Ready is negative. A serial data rate clock input from the data source. Positive clock transitions must correspond to data transitions. A transmit data rate clock for use by an external data source. Positive clock transitions correspond to data transitions.

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Appendix D DTE Interface Signal Assignments

Table D-1 Interface Signal List (Female Connectors), Pins and Standard Signal Names (Cont.) Signal Function

V.24/ RS-232, DB-25

V.35, 34-pin Pin

Circuit SCT(A)115 SCT(B)115

RS-530, DB-25

X.21B, DB-15 Pin

Description

Circuit

17 9

DD(A) DD(B)

A receive data rate clock output for use by an external data sync. Positive clock transitions correspond to data transitions.

Receive clock

23 22

V X

Local Analog Loop

A control signal, which, when on, instructs FOM-20 to send a Local Analog Loopback (V.54 Loop 3).

Remote Digital Loop

A control signal which, when on, instructs FOM-20 to send a remote Loopback command (V.54 Loop 2) to the remote FOM-20.

Test Indicator

A control signal output from FOM-20; positive during any test mode.

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Appendix D DTE Interface Signal Assignments

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Appendix E Connecting RS-530 to RS-422 Table E-1 Interface List for Connecting FOM-20 (RS-530) to V.36 DTE (RS-422) Signal Function

Protective Ground Signal Ground

RS-449 (RS-422/423)

RS-530

37-Pin

DB-25 Female Standalone and Frame Pin Circuit

Circuit

Shield

19, 37, 20

Transmitted Data

22 4

SD(B) SD(A)

2 14

BA(A) BA(B)

Received Data

6 24

RD(A) RD(B)

3 16

BB(A) BB(B)

Request to Send

7 25

RS(A) RS(B)

4 19

CA(A) CA(B)

Clear to Send

9 27

CS(A) CS(B)

5 13

CB(A) CB(B)

Data Set Ready

11 29

DM(A) DM(B)

6 22

CC(A) CC(B)

Data Terminal ready

12 30

TR(A) TR(B)

20 23

CD(A) CD(A)

Carrier Detect

13 31

RR(A) RR(B)

8 10

CF(A) CF(B)

External Transmit Clock

17 35

TT(A) TT(B)

24 11

DA(A) DA(B)

Transmit Clock

5 23

ST(A) ST(B)

15 12

DB(A) DB(B)

Receive Clock

26 8

RT(B) RT(A)

17 9

DD(A) DD(B)

Local Analog Loopback

Remote Loopback

Test Indicator

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Appendix E Connecting RS-530 to RS-422

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References