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Multitech MT56DSU-S manual

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Table of contents for the manual

  • Page 1

    MT56DSU-S Syncronous 56K bps Data Service Unit User Guide[...]

  • Page 2

    MT56DSU-S User Guide PN: S000327A Copyright ©2003 by Multi-Tech Systems, Inc. All rights reserved. This publication may not be reproduced, in whole or in part, without prior written permission from Multi- Tech Systems, Inc. Multi-Tech Systems, Inc. makes no representations or warranties with respect to the contents hereof and specifically disclaim[...]

  • Page 3

    Content s Chapter 1 - Introduction ..................................................................................... 5 1.1 Introduction ............................................................................................. 6 1. 2 About This Manual .................................................................................. 6 1. 3 D[...]

  • Page 4

    Chapter 5 - Service & Warranty ....................................................................... 23 5. 1 Multi-T ech Systems, Inc. W arranty & Repairs Policies ......................... 24 5.1.1 Warranty ............................................................................................. 2 4 5.1.2 U.S. and Canadian Customers [...]

  • Page 5

    Chapter 1 - Introduction[...]

  • Page 6

    6 Chapter 1 - Introduction 1 .1 Introduction The Multi-Tech Systems MultiDSU, model number MT56DSU-S is a synchronous 56 Kbps data service unit (DSU). As a combined DSU and Channel Service Unit (CSU), it provides a direct connection to the DATAPHONE ® Digital Service (DDS) network. The MT56DSU-S connects a synchronous Data Terminal Equipment (DTE)[...]

  • Page 7

    7 Chapter 1 - Introduction 1 .3 Description The MT56DSU-S is compact, easy to operate and has the features to allow flexibility in meeting your transmission requirements. The DDS is a service for transmission of digital signals via digital transmission facilities exclusively. The MT56DSU-S is designed to meet AT&T Technical Publication 62310 re[...]

  • Page 8

    8 Chapter 1 - Introduction 1.5 Features The MT56DSU-S provides many useful features. Standard features include V.35 and EIA-232-D interfaces on the data port (DTE device) and a synchronous rate of 56 Kbps on both the data port and trunk, and user- selectable clocking option. Your Multi-Tech DSU/CSU provides the following features:  Supports dire[...]

  • Page 9

    9 Chapter 1 - Introduction 1 .6 Specifications Model Number: MT56DSU-S Device Operation: combined DSU and CSU Data Rates: Synchronous 56 Kbps (Data port and line) Interfaces: Data (RS232) DB25S (female) - Data port Data (V.35) DB25S (female) - Data port with an adapter cable Line (DDS) RJ-48 8-position keyed jack - Line Power Requirements: 115V AC,[...]

  • Page 10

    Chapter 2 - Front & Back Panel Descriptions[...]

  • Page 11

    11 Chapter 2 - Front & Back Panel Descriptions 2 .1 Introduction This chapter describes the front panel LEDs and back panel connectors. The front panel has one row of LEDs. Two back panel connectors provide the data and DDS or LADS connections. A circular power connector is provided to connect the external power supply. 2 . 2 Front Panel The fr[...]

  • Page 12

    12 Chapter 2 - Front & Back Panel Descriptions 2 . 3 Back Panel All the cable connections, including one power connection and two signal connections, are made at the back panel of the DSU. The RS232 connector is used to connect the DSU to an RS232 or V.35 device, and the LINE connector connects to a DDS or LADS (Local Area Data Set) circuit. Th[...]

  • Page 13

    13 Chapter 2 - Front & Back Panel Descriptions 2 . 4 Switch Settings An 8-position DIP switch is located on the right side of the MT56DSU-S printed circuit board (when viewed from the front, as in Figure 2-3). The DIP switch functions are described in the following table. 1 2 3 4 5 6 7 8 DIP-Switch Figure 2-3. Switch Settings Table 2-1. Switch [...]

  • Page 14

    14 Chapter 2 - Front & Back Panel Descriptions 2.5 Shunts V.35 signal levels are more reliable for high speed data and/or longer cable distances. For higher speeds and/or longer distances, V.35 is preferred. EIA-232-D signal levels are intended for data rates of 19.2 Kbps or less and cable lengths of 50 feet or less. There are two shunt positio[...]

  • Page 15

    Chapter 3 - Unp acking & Setup[...]

  • Page 16

    16 Chapter 3 - Unpacking & Setup 3 .1 Introduction This chapter describes the unpacking of the DSU, cable connections depending on whether EIA-232-D or ITU-T V.35 interface signaling is used on the data port, and how to configure the unit dependent on your site situation. Once the DSU is configured, then the data port can be connected to your d[...]

  • Page 17

    17 Chapter 3 - Unpacking & Setup 3.4 Setup Perform the following procedure to connect your cables and, if necessary, change to V.35 signaling on the data port. 1. If the DTE device has a V.35 interface, the internal shunt must be moved to the V.35 position and a V.35 adapter cable must be connected to the data connector (labeled “RS232”). R[...]

  • Page 18

    18 Chapter 3 - Unpacking & Setup 3 . 5 V .35 Shunt Either EIA-232-D or ITU-T V.35 electrical signal interface can be selected on the Data connector. Units are shipped with EIA-232-D signal levels selected. Use the following procedure to select V.35. CAUTION : This procedure requires opening the unit. Like most products of this type, this produc[...]

  • Page 19

    Chapter 4 - Diagnostics[...]

  • Page 20

    20 Chapter 4 - Diagnostics 4 .1 Introduction The DSU is set to a default of Normal (non-diagnostic) mode at the factory. When diagnostics are to be run, change the Loopback DIP switch as described in Chapter 2 of this manual. When a failure occurs in the digital facility (Telco equipment), the network will detect the failure and send a repetitive O[...]

  • Page 21

    21 Chapter 4 - Diagnostics 4.1.2 Line Loopback Test This test enables you to test the local DTE, the local DSU, the communications link, and the remote DSU. Use the following steps to perform the Trunk Loopback Test. 1. Set DIP switch #3 on the remote DSU to the down position. 2. Send data from the local DTE, it should be looped back to the local D[...]

  • Page 22

    22 Chapter 4 - Diagnostics 4.1.4 DSU Back-to-Back Test This test lets you connect two DSUs with a back-to-back cable to verify proper DSU operation. Using a DSU that is known to be operational, you can test a second DSU that is suspect. 1. Obtain a DSU Back-to-Back cable (#45050000) from Multi-Tech, or assemble one. Refer to Appendix B for instruct[...]

  • Page 23

    Chapter 5 - Service & W arranty[...]

  • Page 24

    24 Chapter 5 - Service & Warranty 5 . 1 Multi-T ech Systems, Inc. W arranty & Repairs Policies 5.1.1 Warranty Multi-Tech Systems, Inc., (hereafter “MTS”) warrants that its products will be free from defects in material or workmanship for a period of two, five, or ten years (depending on model) from date of purchase, or if proof of purch[...]

  • Page 25

    25 Chapter 5 - Service & Warranty 5.1.3 International Customers (outside U.S.A. and Canada) Your original point of purchase reseller may offer the quickest and most economical repair option for your Multi-Tech product. You may also contact any Multi-Tech sales office for information about the nearest distributor or other repair service for your[...]

  • Page 26

    26 Chapter 5 - Service & Warranty 5.2 Repairs 5.2.1 Repair Procedures for U.S. and Canadian Customers In the event that service is required, products may be shipped, freight prepaid, to our Mounds View, Minnesota factory: Multi-Tech Systems, Inc. 2205 Woodale Drive Mounds View, MN 55112 Attn: Repairs, Serial # ____________ A Returned Materials [...]

  • Page 27

    27 Chapter 5 - Service & Warranty Repairs for damages caused by lightning storms, water, power surges, incorrect installation, physical abuse, or user-caused damages are billed on a time-plus-materials basis. 5.2.3 Repair Procedures for International Distributors Procedures for International Distributors of Multi-Tech products are on the distri[...]

  • Page 28

    Appendix[...]

  • Page 29

    29 Appendix Appendix A - Application Examples Introduction This section illustrates several types of applications in which the MT56DSU-S is typically used. These types include:  Local Area Data Set  DDS point-to-point application  DDS multipoint (polled) application Local Area Data Set Application In this application, two pairs of wires pr[...]

  • Page 30

    30 Appendix DDS Multipoint (Polled) Application Since your Central Office (CO) equipment must include “Multipoint Junction Units” (MJUs) and other special arrangements for this type of service, you may need to coordinate efforts with your network service provider. The MT56DSU-S at the host end is the Master Station (also called the “Control S[...]

  • Page 31

    31 Appendix Appendix B - Interface Signals and Connector Pinouts RJ-48 Connector Pin 1 Pin 8 Key As viewed from the rear Figure B-1. Connector DESCRIPTION This connector ties the MT56DSU-S to the DDS Network. The RJ-48 connector is keyed for proper insertion of a keyed RJ-48 plug. PIN IDENTIFICATION P in Description Destination 1 Transmit Pair To L[...]

  • Page 32

    32 Appendix DB25S Connector 13 12 1 1 10 9 8 7 6 5 4 3 2 1 25 24 23 22 21 20 19 18 17 16 15 14 Figure B-2. Connector DESCRIPTION This connector ties the MT56DSU-S to the DTE. The DB25S connector has the following pinout configuration. PIN IDENTIFICATION P in Description Signal 1 Chassis Ground 2 Transmit Data SD 3 Received Data R D 4 Request To Sen[...]

  • Page 33

    33 Appendix DB25S Connector with V.35 Interface 13 12 1 1 10 9 8 7 6 5 4 3 2 1 25 24 23 22 21 20 19 18 17 16 15 14 Figure B-3. Connector DESCRIPTION The DB25 connector also ties the MT56DSU-S to a DTE with a V.35 interface. When a V.35 interface device is connected to a MT56DSU-S, the internal shunt has to be moved to the V.35 position. The V.35 in[...]

  • Page 34

    34 Appendix Loopback Cable (MTS P/N 45640100) 1 8 Figure B-5. Loopback Cable Connector DESCRIPTION This cable lets you test the MT56DSU-S when a second DSU is not available. When the DSU generates a signal, this cable “loops” the signal back to the DSU for comparison to the original signal sent. You can order this cable (#45640100) from Multi-T[...]

  • Page 35

    35 Appendix Back-To-Back Cable (MTS P/N 45050000) 1 8 Figure B-7. Back-toBack Cable Connector DESCRIPTION This cable lets you test a suspect DSU by connecting it to a known good DSU. It tests the suspect DSU by connecting its Transmit signal to the Receive circuits of the good DSU. You can order this cable from Multi- Tech (#45050000), or build one[...]

  • Page 36

    36 Appendix Appendix C - Regulatory Information FCC Regulations for Telephone Line Interconnection 1. This equipment complies with Part 68 of the FCC rules. On the outside surface of this equipment is a label that contains, among other information, the FCC registration number and ringer equivalence number (REN). If requested, this information must [...]

  • Page 37

    37 Appendix Canadian Limitations Notice Notice: The ringer equivalence number (REN) assigned to each terminal device provides an indication of the maximum number of terminals allowed to be connected to a telephone interface. The termination of a interface may consist of any combination of devices subject only to the requirement that the sum of the [...]

  • Page 38

    S000327A[...]