Multitech MT56DSU-S Manual de usuario
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.
Multi-Tech Systems, Inc. makes no representations or warranties with respect to the contents hereof and specifically
disclaims any implied warranties of merchantability or fitness for any particular purpose. Furthermore, Multi-Tech
Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof
without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes.
Revision Date Description
A 12/30/2003 Initial release of MT56DSU-S User Manual on CD.
Trademarks
MultiTech and the MultiTech logo are trademarks of Multi-Tech Systems, Inc. All other references are trademarks of their
respective companies.
Technical Support
France [email protected] +33 1-64 61 09 81
India [email protected] +91 124 6340778
U.K. [email protected] +44 118 959 7774
World Headquarters
Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, Minnesota 55112 U.S.A.
(763) 785-3500 or (800) 328-9717
U.S. FAX (763) 785-9874
Technical Support (800) 972-2439
www.multitech.com
Contents
Chapter 1 - Introduction..................................................................................... 5
1.1 Introduction ............................................................................................. 6
1.2 About This Manual .................................................................................. 6
1.3 Description ............................................................................................. 7
1.4 CSU DSU Basics ................................................................................... 7
1.4.1 DSUFunctions .....................................................................................7
1.4.2 CSUFunctions .....................................................................................7
1.5 Features ................................................................................................. 8
1.6 Specifications ......................................................................................... 9
Chapter 2 - Front & Back Panel Descriptions................................................ 10
2.1 Introduction ........................................................................................... 11
2.2 Front Panel ........................................................................................... 11
2.3 Back Panel ........................................................................................... 12
2.3.1 POWERConnector .............................................................................12
2.3.2 RS232Connector................................................................................12
2.3.3 LINEConnector ..................................................................................12
2.4 Switch Settings..................................................................................... 13
2.5 Shunts .................................................................................................. 14
Chapter 3 - Unpacking & Setup....................................................................... 15
3.1 Introduction ........................................................................................... 16
3.2 Unpacking ............................................................................................. 16
3.3 Telecom Safety Warnings ..................................................................... 16
3.4 Setup .................................................................................................... 17
3.5 V.35 Shunt ............................................................................................ 18
Chapter 4 - Diagnostics.................................................................................... 19
4.1 Introduction ........................................................................................... 20
4.1.1 LoopbackTest ....................................................................................20
4.1.2 LineLoopbackTest ............................................................................21
4.1.3 DSULoopback Test............................................................................21
4.1.4 DSU Back-to-Back Test .....................................................................22
Chapter 5 - Service & Warranty....................................................................... 23
5.1 Multi-Tech Systems, Inc. Warranty & Repairs Policies ......................... 24
5.1.1 Warranty .............................................................................................24
5.1.2 U.S.andCanadianCustomers............................................................24
5.1.3 InternationalCustomers(outsideU.S.A.andCanada)........................25
5.1.4 InternationalDistributors.....................................................................25
5.2 Repairs ................................................................................................. 26
5.2.1 RepairProceduresforU.S.andCanadianCustomers ........................26
5.2.2 RepairProceduresforInternationalCustomers...................................26
5.2.3 RepairProceduresforInternationalDistributors..................................27
5.2.4 ReplacementParts .............................................................................27
5.3 Technical Support ................................................................................. 27
5.4 Internet Site .......................................................................................... 27
Appendix............................................................................................................ 28
Appendix A - Application Examples ................................................................ 29
Introduction......................................................................................................29
Local Area Data Set Application ......................................................................29
DDSPoint-To-PointApplication.......................................................................29
DDSMultipoint(Polled)Application .................................................................30
Appendix B - Interface Signals and Connector Pinouts ................................. 31
RJ-48Connector..............................................................................................31
DB25SConnector ............................................................................................32
DB25SConnectorwithV.35Interface .............................................................33
LoopbackCable (MTSP/N45640100)............................................................34
Back-To-BackCable (MTSP/N45050000).....................................................35
Appendix C - Regulatory Information ............................................................. 36
FCCRegulationsforTelephoneLineInterconnection ......................................36
CanadianLimitationsNotice ............................................................................37
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. The MT56DSU-S connects a synchronous Data Terminal
Equipment (DTE) device to remote equipment using DDS network lines at 56 Kbps speeds for point-to-point
and multi-point service.
Figure 1-1. MultiDSU Modem
1.2 About This Manual
Chapter 1 - Introduction contains an introduction to the MT56DSU-S product and its features and functions.
Chapter 2 - Front and Rear Panel Descriptions provides front panel LED descriptions and rear panel
connector descriptions, DIP-switch settings, and an RS232/V.35 shunt description.
Chapter 3 - Unpacking and Setup provides unpacking, safety warnings, setup procedures, and how to
change the shunt from the default RS232 position to the V.35 position.
Chapter 4 - Diagnostic Testing explains how to set up and run a diagnostic test.
Chapter 5 - Service and Warranty provides instructions on getting service for your MultiDSU at the factory, a
statement of the limited warranty, information about our user bulletin board service, and space for recording
information about your MultiDSU prior to calling Multi-Tech's Technical Support. The final three sections
explain how to use our bulletin board service (BBS), and get support through CompuServe and the Internet.
Appendix A - Application Examples illustrates several DSU/CSU uses that may help in understanding your
particular installation site.
Appendix B - Interface Signal and Connector Pinouts lists the various electronic signals and connector
pinouts related to the MT56DSU-S.
Appendix C - Regulatory Information
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 requirements.
As such, the MT56DSU-S provides all the functions required on the customer side of the network.
You will find the MT56DSU-S easy to install, use and maintain. It is recommended that you read the entire
manual early in your experience with the MT56DSU-S so you can appreciate all of the MT56DSU-S features
and options.
1.4 CSU/DSU Basics
A DSU (Data Service Unit) and a CSU (Channel Service Unit) are typically connected to provide the interface
between DTE (data terminal equipment) and a DDS or other four-wire network.
The DSU processes serial synchronous digital data over the DDS network or other four-wire unloaded
twisted-pair network.
The MT56DSU-S contains the functions of a DSU and CSU in a single package.
1.4.1 DSU Functions
The DSU encodes data as pulses on the communications line by converting the customer data stream to
bipolar format for transmission over the digital network.
1.4.2 CSU Functions
The CSU terminates the digital circuit at the customer site. It performs line conditioning functions, ensures
network compliance with FCC rules, and responds to test commands (either from the Telco central office (CO)
or from the DSU).
The figure below shows the MT56DSU-S in a basic DDS network installation.
DTE
DDS
Network
DTE
DSU
DSU
Figure 1-2. Basic DSU/CSU Configuration
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 direct connection to the DATAPHONE Digital Data Service (DDS) or compatible network
Standard EIA-232-D and V.35 interfaces on the data port (DTE device) and DDS interface on the line
• Multiple selectable clocking
- Internal clocking
- DDS (slave) clocking
• Multiple MT56DSU-S-activated diagnostic tests
- Local loopback test
- Digital loopback test
• Multiple Telco-activated diagnostic tests
- DSU loopback test
- CSU loopback test
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, 50-60 Hz, 2 Watts
Temperature: 32 to 120° F (0 to 50° C)
Humidity: 20 to 90% (non-condensing)
Dimensions: 1" H x 4.125" W x 5.5" D
2.5 cm H x 10.8 cm W x 14.2 cm D
Weight: 8 oz. (224 g)
Certification: FCC Part 15 Class B
FCC Part 68
UL Listed
Compatibility: AT&T Pubs 62310
FIC Codes: 04DU5-56
USOC Jack: RJ-48S
Transmitter/Receiver:
Modulation bipolar return to zero (BRZ)
Transmit Level 1.4V peak (+6dBm) into 135 Ohm at 56 Kbps
OutputImpedance 135 ohms
Receive Levels +6 to -45 dBm
InputImpedance 135 ohms
Delay Times (in secs.) RTS/CTS DCD on DCD off
0.4 0.3 0.2
Chapter 2 - Front & Back
Panel Descriptions
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