Instruction/ maintenance manual of the product MT56DSU-S Multitech
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MT56DSU-S Syncronous 56K bps Data Service Unit User Guide.
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.
Content s Chapter 1 - Introduction ..................................................................................... 5 1.1 Introduction ............................................................................................. 6 1. 2 About This Manual .
Chapter 5 - Service & Warranty ....................................................................... 23 5. 1 Multi-T ech Systems, Inc. W arranty & Repairs Policies ......................... 24 5.1.1 Warranty .................................
Chapter 1 - Introduction.
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.
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.
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.
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.
Chapter 2 - Front & Back Panel Descriptions.
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.
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.
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.
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.
Chapter 3 - Unp acking & Setup.
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.
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.
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.
Chapter 4 - Diagnostics.
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.
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.
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.
Chapter 5 - Service & W arranty.
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.
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.
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.
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.
Appendix.
29 Appendix Appendix A - Application Examples Introduction This section illustrates several types of applications in which the MT56DSU-S is typically used.
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.
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.
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.
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.
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.
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.
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).
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.
S000327A.
An important point after buying a device Multitech MT56DSU-S (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Multitech MT56DSU-S yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Multitech MT56DSU-S - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Multitech MT56DSU-S you will learn all the available features of the product, as well as information on its operation. The information that you get Multitech MT56DSU-S will certainly help you make a decision on the purchase.
If you already are a holder of Multitech MT56DSU-S, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Multitech MT56DSU-S.
However, one of the most important roles played by the user manual is to help in solving problems with Multitech MT56DSU-S. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Multitech MT56DSU-S along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
