Black Box Sync/Async Fiber Optic Modem User Manual
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Black Box Sync/Async Fiber Optic Modem User Manual

Black Box Sync/Async Fiber Optic Modem User Manual

Sync/async fiber optic modem
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Sync/Async Fiber Optic Modem
CUSTOMER
SUPPORT
INFORMATION
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com
JUNE 2000
ME555A
ME555AE
ME556A
ME556AE

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Summary of Contents for Black Box Sync/Async Fiber Optic Modem

  • Page 1 Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX SUPPORT FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 INFORMATION Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 Web site: www.blackbox.com • E-mail: info@blackbox.com...
  • Page 2 FCC INFORMATION FEDERAL COMMUNICATIONS COMMISSION INDUSTRY CANADA RADIO FREQUENCY INTERFERENCE STATEMENTS This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio communication. It has been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart J of Part 15 of FCC rules, which are designed to provide reasonable protection against such interference when the equipment is...
  • Page 3 SYNC/ASYNC FIBER OPTIC MODEM FCC REQUIREMENTS FOR TELEPHONE-LINE EQUIPMENT 1. The Federal Communications Commission (FCC) has established rules which permit this device to be directly connected to the telephone network with standardized jacks. This equipment should not be used on party lines or coin lines.
  • Page 4 DOC STATEMENT CERTIFICATION NOTICE FOR EQUIPMENT USED IN CANADA The Canadian Department of Communications label identifies certified equipment. This certification means that the equipment meets certain telecommunications-network protective, operation, and safety requirements. The Department does not guarantee the equipment will operate to the user’s satisfaction.
  • Page 5 SYNC/ASYNC FIBER OPTIC MODEM TELECOMMUNICATION SAFETY The safety status of each of the ports on the Sync/Async Fiber Optic Modem is declared according to EN 41003 and is detailed in the table below: Safety Status Ports SELV* RS-530 *SELV=Safety Extra-Low Voltage LASER WARNINGS This product may be equipped with a laser diode.
  • Page 6 NOM STATEMENT NORMAS OFICIALES MEXICANAS (NOM) ELECTRICAL SAFETY STATEMENT INSTRUCCIONES DE SEGURIDAD 1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado. 2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura.
  • Page 7 SYNC/ASYNC FIBER OPTIC MODEM 12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización del equipo no sea eliminada. 13. Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetos colocados sobre o contra ellos, poniendo particular atención a los contactos y receptáculos donde salen del...
  • Page 8 TRADEMARKS TRADEMARKS USED IN THIS MANUAL AS/400 ® is a registered trademark of International Business Machines Corporation. ® is a registered trademark of American Telephone and Telegraph Company. Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.

  • Page 9: Table Of Contents

    SYNC/ASYNC FIBER OPTIC MODEM Contents Quick Start Guide ......... . 10 1.
  • Page 10 CONTENTS 4.4.3 Power-Off Procedure ......32 5. Troubleshooting and Diagnostics ......33 5.1 General .

  • Page 11: Quick Start Guide

    SYNC/ASYNC FIBER OPTIC MODEM Quick Start Guide Only an experienced technician should install the Sync/Async Fiber Optic Modem. If you are familiar with fiberoptic modems, use this Quick Start Guide to prepare the Modem for operation. If you are not familiar with fiberoptic modems, please read the entire manual.
  • Page 12 QUICK START GUIDE ONNECTING TO OWER OURCE Connect the Fiber Optic Modem to an AC power source (AC power mains outlet) or DC source (Ringer). The PWR LED lights to indicate that the Fiber Optic Modem is on. ERIFYING ERFORMANCE When data is being transferred, observe that the following front-panel LEDs light or blink: •...

  • Page 13: Specifications

    SYNC/ASYNC FIBER OPTIC MODEM 1. Specifications Electrical Interface Transmission Rates—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—RS530 via DB25 female Optical Interface Operating Wavelength—850 nm for multimode fiber; 1300 nm for single-mode fiber Transmission Line—Dual fiber optic cable...
  • Page 14 CHAPTER 1: Specifications Test Pattern—Activated by front-panel switch (PATT) Timing Elements Receive Clock—Derived from the Receive signal Transmit Clock—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 LEDs—Transmit Data (TD), Receive Data (RD), Request to Send (RTS), Data Carrier Detect (DCD), Test Error (ERR), Power (PWR), Loopback mode or...

  • Page 15: Introduction

    2.1 Overview 2.1.1 G ENERAL The Sync/Async Fiber Optic Modem provides a secure, long-range data link between computers, routers, multiplexors, and other data communication (DTE) devices at output power ranges from 12 to 18 dB. The Modem operates in either half- or full-duplex mode over sixteen selectable synchronous/asynchronous data rates ranging from 19.2 kbps to 256 kbps,...

  • Page 16: Versions

    2.1.3 V ERSIONS Four standalone versions of the Fiber Optic Modem are available. • Sync/Async Fiber Optic Modem, ST connectors, 1300-nm single-mode fiber, RS-530, 115-VAC power supply (part number ME555A). • Sync/Async Fiber Optic Modem, ST connectors, 1300-nm single-mode fiber, RS-530, 230-VAC power supply (part number ME555AE).

  • Page 17: Physical Description

    SYNC/ASYNC FIBER OPTIC MODEM 2.2 Physical Description The Fiber Optic Modem is a compact unit, intended for installation on desktops or shelves. The unit height is 1.7 inches (4.3 cm). Figure 2-2. Fiber Optic Modem. 2.2.1 F RONT ANEL All controls (pushbutton switches) and LED indicators are located on the front panel.

  • Page 18: Interface

    CHAPTER 2: Introduction 2.3.2 I NTERFACE The Fiber Optic Modem has an RS-530 interface. 2.3.3 T IMING 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. •...
  • Page 19 SYNC/ASYNC FIBER OPTIC MODEM Tests can be carried out from the remote Fiber Optic Modem by pressing the PATT pushbutton on the remote unit or by connecting a Bit Error Rate Tester, which uses the standard 511-bit pattern. Figure 2-3. Block Diagram.

  • Page 20: Installation And Setup

    CHAPTER 3: Installation and Setup 3. Installation and Setup 3.1 Introduction This chapter provides mechanical and electrical installation procedures for the Fiber Optic Modem. It is a fully assembled standalone unit. If you encounter a problem, refer to Chapter 5 for Test and Diagnostics instructions.

  • Page 21: What The Package Includes

    • Fiber Optic Modem (protected by adequate cushioning) • AC power cord • This users’ manual If anything is missing or damaged, contact Black Box at 724-746-5500. 3.4 What You Need to Supply To operate the Fiber Optic Modem on a desktop or shelf, no additional equipment is required.
  • Page 22 CHAPTER 3: Installation and Setup To open the Fiber Optic Modem’s case: 1. Disconnect the power cord from the mains outlet. 2. Release the two rear-panel screws and use them as levers to slide out the printed circuit board interior. To set switches and jumpers: 1.
  • Page 23 SYNC/ASYNC FIBER OPTIC MODEM Table 3-1. Fiber Optic Modem Strap Selection Strap Identity Function Possible Settings Factory Setting Enables or disables V54 DIS DIG.LOOP from remote pattern. Selects the transmit CARRIER carrier mode. When CNTRL “ON,” transmit carrier is constantly “ON.”...
  • Page 24 CHAPTER 3: Installation and Setup Table 3-1 (continued). Fiber Optic Modem Strap Selection Strap Identity Function Possible Settings Factory Setting In CON position, signal CHASS ground is connected to (Chassis chassis ground. In DIS Ground) position, the signal ground is isolated from the chassis ground.
  • Page 25 SYNC/ASYNC FIBER OPTIC MODEM Figure 3-1. Fiber Optic Modem Configuration Diagram.

  • Page 26: Connecting The Interfaces

    CHAPTER 3: Installation and Setup Table 3-2. Async Character Length Setting Start Bit Data Bits Parity Stop Bit No. of Bits NONE NONE 1, 1.5, 2 ODD, 1, 1.5, 2 EVEN NONE 1, 1.5, 2 ODD, 1, 1.5, 2 EVEN NONE 1, 1.5, 2 ODD, EVEN...
  • Page 27 SYNC/ASYNC FIBER OPTIC MODEM Connecting the Fiber Optic Cables Two fiber optic ST connectors are located on the rear panel and marked TX and 1. Remove the protective caps from the connectors and store them in a safe place for later use.

  • Page 28: Connecting The Power

    CHAPTER 3: Installation and Setup 3.5.3 C ONNECTING THE OWER WARNING The Fiber Optic Modem has no power switch. Operation starts when you apply power to the rear panel POWER connector. First, connect the plug of the power cord to the Fiber Optic Modem POWER connector and then to the mains power source (outlet).

  • Page 29: Operation

    SYNC/ASYNC FIBER OPTIC MODEM 4. Operation 4.1 General This chapter describes the Fiber Optic Modem’s controls and indicators and their functions, explains the operating procedures, and supplies instructions for making changes in field strapping. Complete and check all of the installation procedures given in Chapter 3 before attempting to operate the Fiber Optic Modem.
  • Page 30 CHAPTER 4: Operation Table 4-1. Fiber Optic Modem’s Front-Panel Controls and Indicators Item No. Name Type Function Green LED On when the Power is on. Yellow LED On when the terminal activates Request to Send. NOTE: The CARRIER jumper should be set to ON;...

  • Page 31: Initial Operation And Basic Checks

    SYNC/ASYNC FIBER OPTIC MODEM Table 4-1 (continued). Fiber Optic Modem’s Front-Panel Controls and Indicators Item No. Name Type Function Pushbutton 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 5-1).

  • Page 32: Running Self-Test

    CHAPTER 4: Operation 4.3.2 R UNNING Verify that Fiber Optic Modem is functioning properly by running the following tests. 1. Press the ANA switch on the front panel to the On position (down). 2. Press the PATT pushbutton. Check that the: •...

  • Page 33: Running Diagnostic Loops

    SYNC/ASYNC FIBER OPTIC MODEM 4.4.2 R UNNING IAGNOSTIC OOPS Refer to Chapter 5 for more information on running diagnostic loops. 4.4.3 P OWER ROCEDURE To power down the Fiber Optic Modem, remove the AC power cord from the AC mains supply.

  • Page 34: Troubleshooting And Diagnostics

    CHAPTER 5: Troubleshooting and Diagnostics 5. Troubleshooting and Diagnostics This chapter contains: • A description of the ITU V.54 diagnostic capabilities for performing local analog loopbacks and local and remote digital loopbacks. • A description of the internal BERT circuitry and tests used to verify normal system operation.

  • Page 35: Loopback Tests

    SYNC/ASYNC FIBER OPTIC MODEM • Communication Link: determines the performance of both the local and remote Fiber Optic Modems and of the link between them. Tests are activated by pushbuttons and monitored via LED indicators on the front panel of Fiber Optic Modem. For a description of the Fiber Optic Modem’s controls and indicators and their functions, see Chapter 4.

  • Page 36: Remote Digital Loopback (Rlb) Standard V.54

    CHAPTER 5: Troubleshooting and Diagnostics Fiber Optic Modem Figure 5-1. Local Fiber Optic Modem in Analog Loopback (LLB). If the test detects a fault, 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 Fiber Optic Modem is not faulty or improperly connected.

  • Page 37: Local Digital Loopback (Dig) Non-Standard

    SYNC/ASYNC FIBER OPTIC MODEM Remote Fiber Local Fiber Optic Modem Optic Modem Figure 5-2. Fiber Optic Modem in Remote Digital Loopback (RLB). Press the REM pushbutton 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.

  • Page 38: Internal Bert Circuit Test

    CHAPTER 5: Troubleshooting and Diagnostics Pressed Local Fiber Remote Fiber Optic Modem Optic Modem Figure 5-3. Activating RLB at the Remote Modem (Local Fiber Optic Modem in a Digital Loopback). 5.3 Internal BERT Circuit Test The Fiber Optic Modem has a built-in BERT circuit, consisting of a pattern generator and a pattern tester.

  • Page 39: Two-Bert Test

    SYNC/ASYNC FIBER OPTIC MODEM NOTE 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 pushbutton. Verify that: • DCD TEST and RTS LEDs light up.

  • Page 40: Local) Analog Loopback Test

    CHAPTER 5: Troubleshooting and Diagnostics PATT Pressed PATT Pressed (Disconnects (Disconnects External DTE) External DTE) Fiber Optic Fiber Optic Modem Modem Figure 5-5. Fiber Optic Modem BER System Test (Two-BERT Test). 5.4 (Local) Analog Loopback Test This test checks the performance of the local modem, the local data terminal equipment, and the cables between them.
  • Page 41 SYNC/ASYNC FIBER OPTIC MODEM 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 the Fiber Optic Modem. 5. After completing the test (or when the fault has been corrected), reset the ANA pushbutton to the OFF position (Up).

  • Page 42: Communication Link Test

    CHAPTER 5: Troubleshooting and Diagnostics 5.5 Communication Link Test 5.5.1 R EMOTE IGITAL OOPBACK The remote digital loopback test determines the performance of both the local and remote Fiber Optic Modem, and the quality of the link between the local and remote units.

  • Page 43: Appendix A: Dte Interface Signal Assignments

    SYNC/ASYNC FIBER OPTIC MODEM Appendix A. DTE Interface Signal Assignments Table A-1. Interface Signal List (Female Connectors), Pins, and Standard Signal Names Signal Function RS-530 DB25 Description Circuit Protective Ground 1 Chassis ground. May be isolated from Signal Ground (refer to Table 3-1).
  • Page 44 APPENDIX A: DTE Interface Signal Assignments Table A-1 (continued). Interface Signal List (Female Connectors), Pins, and Standard Signal Names Signal Function RS-530 DB25 Description Circuit Data Set Ready CC(A) A positive level from the Fiber Optic CC(B) Modem when the power is on, and the Fiber Optic Modem is: not in a DIGITAL LOOP mode;...
  • Page 45 SYNC/ASYNC FIBER OPTIC MODEM Table A-1 (continued). Interface Signal List (Female Connectors), Pins, and Standard Signal Names Signal Function RS-530 DB25 Description Circuit Local Analog Loop 18 A control signal, which when on, instructs the Fiber Optic Modem to send a Local Analog Loopback (V.54 Loop 3).

  • Page 46: Appendix B: Connecting Rs-530 To Rs-422

    APPENDIX B: Connecting RS-530 to RS-422 Appendix B. Connecting RS-530 to RS-422 Table B-1. Interface List for Connecting FOM-20 (RS-530) to V.36 DTE (RS-422) Signal Function RS-449 (RS-422/423) EIA 530 37-Pin DB25 Female Standalone and Frame Circuit Circuit Protective Ground Shield Signal Ground 19,37,...
  • Page 47 SYNC/ASYNC FIBER OPTIC MODEM Table B-1 (continued). Interface List for Connecting FOM-20 (RS-530) to V.36 DTE (RS-422) Signal Function RS-449 (RS-422/423) EIA 530 37-Pin DB25 Female Standalone and Frame Circuit Circuit External Transmit TT(A) DA(A) Clock TT(B) DA(B) Transmit Clock...
  • Page 48 © Copyright 2000. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...

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