Paradyne 7511 User manual

MODEL 7511
DUAL DSU
USER’S GUIDE
Document No. 7511-A2-GB20-00
June 1997

Printed on recycled paper
A 7511-A2-GB20-00
June 1997
Copyright 1997 Paradyne Corporation.
All rights reserved.
Printed in U.S.A.
Notice
This publication is protected by federal copyright law. No part of this publication may be copied or distributed,
transmitted, transcribed, stored in a retrieval system, or translated into any human or computer language in any form
or by any means, electronic, mechanical, magnetic, manual or otherwise, or disclosed to third parties without the
express written permission of Paradyne Corporation, 8545 126th Avenue North, P.O. Box 2826, Largo,
Florida 33779-2826.
Paradyne Corporation makes no representation or warranties with respect to the contents hereof and specifically
disclaims any implied warranties of merchantability or fitness for a particular purpose. Further, Paradyne Corporation
reserves the right to revise this publication and to make changes from time to time in the contents hereof without
obligation of Paradyne Corporation to notify any person of such revision or changes.
Changes and enhancements to the product and to the information herein will be documented and issued as a new
release to this manual.
Trademarks
All products and services mentioned herein are the trademarks, service marks, registered trademarks or registered
service marks of their respective owners.
Warranty, Sales, and Service Information
Contact your sales or service representative directly for any help needed. For additional information concerning
warranty, service, repair, spare parts, installation, documentation, or training, use one of the following methods:
Via the Internet: Visit the Paradyne World Wide Web site at http://www.paradyne.com
Via Telephone: Call our automated call system to receive current information via fax or to speak with a
company representative.
— Within the U.S.A., call 1-800-870-2221
— International, call 727-530-2340

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7511-A2-GB20-00 June 1997
Contents
About This Guide
Document Purpose and Intended Audience iii. . . . . . . . . . . . . . . . . . . . . . . . .
Document Summary iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product-Related Documents iv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1About the Dual DSU
Model 7511 Dual DSU Features 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DSU Configurations 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2Configuring and Installing the DSUs
Configuring the Dual DSU 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Rear Connector Plate 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the DSU Card 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Network and DTE Cables 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3Monitoring the DSUs
Selecting a DSU 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel LEDs 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initialization 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LED Groups 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status LEDs 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Network LEDs 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DSU Selection LEDs 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4Testing
Selecting a DSU 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local Loopback 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CSU or External Network Loopback 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Loopback (DL) and Remote Loopback (RL) 4-3. . . . . . . . . . . . . . . . . .
Ending an Active Test 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
ii 7511-A2-GB20-00
June 1997
5Troubleshooting
Troubleshooting 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ACables and Pin Assignments
Overview A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RJ48T 50-Pin Network Interface Connector A-1. . . . . . . . . . . . . . . . . . . . . . . . .
Digital Network (DDS) Connector A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V.35 DTE Connector A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BTechnical Specifications
Glossary
Index

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7511-A2-GB20-00 June 1997
About This Guide
Document Purpose and Intended Audience
This guide contains information needed to set up, configure, and operate the
Model 7511 DSU and is intended for installers and operators.
Document Summary
Section Description
Chapter 1 About the Dual DSU. Describes the DSU features and
shows examples of typical configurations.
Chapter 2
Configuring and Installing the DSUs. Provides procedures
for setting up and installing the DSU card.
Chapter 3
Monitoring the DSUs. Describes monitoring details about
the LEDs, DSU status, and network statistics.
Chapter 4
Testing. Provides details about available tests and test
setup.
Chapter 5
Troubleshooting. Provides information on device
troubleshooting.
Appendix A
Cables and Pin Assignments. Contains connector and
interface details.
Appendix B
Technical Specifications. Contains physical and regulatory
specifications of the DSU.
Glossary Defines acronyms and terms used in this document.
Index Lists key terms, acronyms, concepts, and sections in
alphabetical order.

About This Guide
iv 7511-A2-GB20-00
June 1997
Product-Related Documents
Document Number Document Title
3000-A2-GA31 COMSPHERE 3000 Series Carrier
Installation Manual
3000-A2-GZ47 Network Interface Cable, Network Interface Module
Installation
7511-A2-GN10 Model 7511 Dual DSU Startup Instructions
To order additional product documentation, refer to Warranty, Sales, and Service
Information
on page A at the beginning of this User’s Guide.

1-1
7511-A2-GB20-00 June 1997
About the Dual DSU 1
Model 7511 Dual DSU Features
The DSU provides an interface between the customer premises equipment (CPE)
and a Digital Data Service (DDS) network.
The DSU’s features and capabilities include:
Two DSUs on one card. Permits up to 32 DSUs in one 3000 Series carrier.
Easy Installation. Connects to your equipment using standard connectors
and cables.
Easy Configuration. Simple hardware strapping minimizes your
customization effort.
DDS Operation. Operates at 56 and 64 kbps CC (clear channel).
Local Area Data Set (LADS) Operation. Operates at 56 and 64 kbps
full-duplex as a limited-distance modem.
Diagnostics. Lets you diagnose device and network problems with digital
loopbacks and pattern tests.
Interoperability. Line-compatible with Model 3510, 3511, 3550, 3551, 3610,
3611, 3615, 3616, 7510, 7610 and 7612 DSUs on the DDS Primary Channel.
Reliability. The 7511 Dual DSU’s Mean Time Between Failures (MTBF) is
over 30 years.

About the Dual DSU
1-2 7511-A2-GB20-00
June 1997
DSU Configurations
As shown in the following illustration, each DSU can be used in a multipoint
network configuration across a DDS network.
DDS
Network
97-1550
0
DTE
DSU
DSU
DTE
DTE
Model 7511 DSU
in 3000 Series Carrier
DSUs can also be used for point-to-point DDS or frame relay applications.
Frame
Relay
Network
97-1536
2
DTE
DTE
DSU
DSU
DTE
DTE
Model 7511 DSU
in 3000 Series Carrier
DSUs can be connected back-to-back to act as Local Area Data Sets. Table B-2
in Appendix B shows the maximum distances for LADS applications.
97-15364
DSU
DTE
DSU
DTE
DTE
Model 7511 DSU
in 3000 Series Carrier
56 or 64 Kbps
DTE 56 or 64 Kbps

2-1
7511-A2-GB20-00 June 1997
Configuring and Installing
the DSUs 2
Configuring the Dual DSU
!HANDLING PRECAUTIONS FOR
STATIC-SENSITIVE DEVICES
The Model 7511 Dual DSU is designed to protect sensitive components
from damage due to electrostatic discharge (ESD) during normal
operation. When performing installation procedures, however, take
proper static control precautions to prevent damage to equipment. If
you are not sure of the proper static control precautions, contact your
nearest sales or service representative.
Procedure
To configure the Model 7511 Dual DSU:
1. Review Table 2-1 to determine the proper settings for your environment.
The first choice for each option (shown in boldface type) is the factory
default setting. If you choose the factory default value, you do not need to
change the position of the associated switch.
The factory default setting for all switches is Off.
2. Mark any options in the table that you wish to differ from the factory default.
3. Using Figure 2-1 and Table 2-1, verify that the switch settings for both DSUs
on the 7511 card match your selections.
Do not modify the settings of switches not listed in the table. Any switch
not designated for customer use should be in the Off position.
4. Where required, verify that the local and remote DSUs employ the same
options. For example, both the local and remote DSU must use the same
Line Rate and 64CC Data Scrambler settings.
496-15104

Configuring and Installing the DSUs
2-2 7511-A2-GB20-00
June 1997
S1
97-15396
12345678
ON
12345678
ON
12345678
ON
12345678
ON
12345678
ON
S2
S3 S4
S5
Figure 2-1. Model 7511 Switch Locations
Table 2-1. Configuration Options (1 of 5)
Switch Options and Usage Default in Bold
Line Rate
S1-1 (DSU A)
S3-1 (DSU B)
S1 S2
S3 S4
DSU A
DSU B
ON ON
ON ON
DDS or LADS line rate.
Off 56 kbps
The line rate is 56 kbps.
ON 64 kbps
LADS: The line rate is 64 kbps.
DDS: The line rate is 64 kbps clear channel.