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NOVEMBER 2000
ME935A
Async Short-Haul Modem MP
b a c k
L o o p
T e s t
r o l
C o n t
r o l
O U T
C o n t
I N
R D
T D
r
P o w e
CUSTOMER
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
SUPPORT
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
INFORMATION
Web site: www.blackbox.com • E-mail: info@blackbox.com
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Summary of Contents for Black Box ME935A
- Page 1 Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500) FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 SUPPORT Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 INFORMATION Web site: www.blackbox.com • E-mail: info@blackbox.com...
- Page 2 TRADEMARKS Trademarks AT&T 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 3 ASYNC SHORT-HAUL MODEM MP FEDERAL COMMUNICATIONS COMMISSION CANADIAN DEPARTMENT OF COMMUNICATIONS 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.
- Page 4 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 5 ASYNC SHORT-HAUL MODEM MP 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 aparato.
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Page 6: Table Of Contents
CONTENTS Contents Chapter Page 1. Specifications......................6 2. Introduction ......................7 2.1 Overview ......................7 2.2 Features ......................7 3. Configuration ......................8 3.1 Quick Set-Up Instructions................8 3.1.1 Point-To-Point Configuration ..............8 3.1.2 Multipoint Configuration ..............8 3.2 DCE/DTE Switch Settings ................9 3.3 Special Configuration ..................9 4. Installation......................11 4.1 Twisted-Pair Wiring Overview..............11 4.1.1 Twisted-Pair Connection Using Terminal Blocks ......12 4.1.2 Twisted-Pair Connection Using RJ-11 ..........12... -
Page 7: Specifications
ASYNC SHORT-HAUL MODEM MP 1. Specifications Asynchronous Transmission Format— Transmission Line— 19 to 26 AWG twisted pair Range— See table in Appendix A Serial Interface— EIA RS-232 (CCITT V.24), DB25 female Twisted-Pair Interface— Terminal blocks, RJ-11 jack Data Rates— Up to 115,200 bps Applications—... -
Page 8: Introduction
CHAPTER 2: Introduction 2. Introduction 2.1 Overview The Async Short-Haul Modem MP is equipped with a virtual wish list of “bells and whistles.” Point-to-point or multipoint applications are supported. Two separate control signals may be passed (one each way), each with switch-selectable pin assignments. -
Page 9: Configuration
ASYNC SHORT-HAUL MODEM MP 3. Configuration The Async Short-Haul Modem MP features externally accessible configuration switches (two DCE/DTE switches and a DIP-switch set), located on the underside of the unit; there is no need to open the case to configure the Modem. 3.1 Quick Set-Up Instructions In the majority of applications, you won’t need an in-depth knowledge of the Modem’s capabilities to get up and running. -
Page 10: Dce/Dte Switch Settings
CHAPTER 3: Configuration 3.2 DCE/DTE Switch Settings Correct setting of the DCE/DTE switches eliminates the need for RS-232 crossover cables. If the RS-232 device you are connecting to the Modem is a PC, terminal, or host (or is wired like one), set both of the DCE/DTE switches to DCE. If the RS- 232 device you are connecting to the Async Short-Haul Modem MP is a modem or multiplexor, or is wired like one, set both of the DCE/DTE switches to DTE. - Page 11 ASYNC SHORT-HAUL MODEM MP Control Input (C in ): The Control Input signal is used by the local Async Short-Haul Modem MP as an input signal to activate its transmitter (Enabled settings) and allow data transmission to the remote device. This is required for half-duplex/switched- carrier environments as well as in hardware flow-control applications.
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Page 12: Installation
CHAPTER 4: Installation 4. Installation The Async Short-Haul Modem MP is easy to install. After configuring the DIP switches and DCE/DTE switches, connect the two twisted pairs using either terminal blocks or the RJ-11 jack. Figure 4-1 shows the location of the terminal blocks and RJ-11 jack, as well as the female DB25 connector. -
Page 13: Twisted-Pair Connection Using Terminal Blocks
ASYNC SHORT-HAUL MODEM MP 4.1.1 T WISTED ONNECTION SING ERMINAL LOCKS If your two-twisted-pair line terminates in bare wires, strip the ends and connect the individual leads to each Modem’s terminal block. Be sure the end-to-end connections follow the diagram on page 11. 4.1.2 T RJ-11 WISTED... -
Page 14: Wiring For Multipoint Circuits
CHAPTER 4: Installation 4.2 Wiring For Multipoint Circuits The Modem supports multipoint applications using either a star or daisychain topology. Both topologies require special wiring, as well as specific DIP-switch settings for master and slave units. 4.2.1 D AISYCHAIN OPOLOGY Using a daisychain topology, you may connect as many as 10 Async Short-Haul Modem MPs together in a master/slave arrangement. -
Page 15: Star Topology
ASYNC SHORT-HAUL MODEM MP 4.2.2 S OPOLOGY Using a star topology, you may connect several Modems together in a master/slave arrangement. Maximum distance between the units will vary based upon the number of drops, data rate, wire gauge, etc. Call Technical Support for specific distance estimates. -
Page 16: Operation
CHAPTER 5: Operation 5. Operation Once you have configured each Async Short-Haul Modem MP properly and connected it, simply plug in the AC power adapter to get it running; there is no power switch on the Modem. You can monitor the Modem’s operation using the front-panel LED indicators and built-in loopback test modes. -
Page 17: Remote Analog Loop
ASYNC SHORT-HAUL MODEM MP 5.2.2 R EMOTE NALOG The second test mode is Remote Analog Loop. It causes any characters sent from the remote Modem to the local Modem to be returned to the remote device (see Figure 5-1). Start the test by pressing the Test button on one of the Modems. Then send data from the other Modem (which must be in normal operating mode). -
Page 18: Troubleshooting
CHAPTER 6: Troubleshooting 6. Troubleshooting Symptom: TD and RD LEDs indicate activity, but units will not communicate or data is garbled. Improper RS-232 wiring. Problem 1: Check wiring between the Modem and connected serial device—it Solution 1: should be straight through. Problem 2: Improper twisted-pair wiring. - Page 19 ASYNC SHORT-HAUL MODEM MP Symptom: LEDs do not light when the AC power transformer is plugged into the wall outlet. The AC transformer is not plugged into the Modem. Problem 1: Plug in the transformer. Solution 1: Problem 2: Loose power connection. Solution 2: Make sure the AC connection is flush.
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Page 20: Appendix A. Cable Recommendations
APPENDIX A: Cable Recommendations Appendix A. Cable Recommendations The Async Short-Haul Modem MP is designed and tested to communicate over twisted-pair cable that has the following characteristics: Wire Gauge Capacitance Resistance 0.0163 Ω/ft. 19 AWG 83 nF/mi. or 15.72 pF/ft. 0.0326 Ω/ft. -
Page 21: Appendix B. Interface Pin Assignments
ASYNC SHORT-HAUL MODEM MP Appendix B. Interface Pin Assignments DIRECTION STANDARD DCE SETTING DIRECTION 1 - (FG) Frame Ground 2 - (TD) Transmit Data To Modem 3 - (RD) Receive Data From Modem 4 - (RTS) Request to Send To Modem 5 - (CTS) Clear to Send From Modem 6 - (DSR) Data Set Ready... -
Page 22: Appendix C. Block Diagram
APPENDIX C: Block Diagram Appendix C. Block Diagram... - Page 23 © 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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