Paradyne HotWire 7924 User manual

HOTWIRE
MODEL 7924 STANDALONE
T1 HDSL TERMINATION UNIT
USER’S GUIDE
Document No. 7924-A2-GB20-30
October 1997

Printed on recycled paper
A 7924-A2-GB20-30
October 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

Important Information
B
7924-A2-GB20-30 October 1997
Important Safety Instructions
1. Read and follow all warning notices and instructions marked on the product or included in the manual.
2. Do not allow anything to rest on the power cord and do not locate the product where persons will walk on the
power cord.
3. Do not attempt to service this product yourself, as opening or removing covers may expose you to dangerous
high voltage points or other risks. Refer all servicing to qualified service personnel.
4. General purpose cables are provided with this product. Special cables, which may be required by the regulatory
inspection authority for the installation site, are the responsibility of the customer.
5. When installed in the final configuration, the product must comply with the applicable Safety Standards and
regulatory requirements of the country in which it is installed. If necessary, consult with the appropriate regulatory
agencies and inspection authorities to ensure compliance.
6. A rare phenomenon can create a voltage potential between the earth grounds of two or more buildings. If
products installed in separate buildings are interconnected, the voltage potential may cause a hazardous
condition. Consult a qualified electrical consultant to determine whether or not this phenomenon exists and, if
necessary, implement corrective action prior to interconnecting the products.
7. In addition, if the equipment is to be used with telecommunications circuits, take the following precautions:
—Never install telephone wiring during a lightning storm.
—Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.
—Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the
network interface.
—Use caution when installing or modifying telephone lines.
—Avoid using a telephone (other than a cordless type) during an electrical storm. There may be a remote risk of
electric shock from lightning.
—Do not use the telephone to report a gas leak in the vicinity of the leak.

Important Information
C 7924-A2-GB20-30
October 1997
EMI Warnings
!WARNING:
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance
with the instruction manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
The authority to operate this equipment is conditioned by the requirements that no modifications will be
made to the equipment unless the changes or modifications are expressly approved by Paradyne
Corporation.
!WARNING:
To Users of Digital Apparatus in Canada:
This Class A digital apparatus meets all requirements of the Canadian interference-causing equipment
regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du règlement sur le matérial
brouilleur du Canada.

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7924-A2-GB20-30 October 1997
Contents
About This Guide
Document Purpose and Intended Audience v. . . . . . . . . . . . . . . . . . . . . . . . .
Document Summary v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product-Related Documents vi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1About HotWire Model 7924 Termination Units
HotWire 7924-A1 Models and Features 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Configurations 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User Interface Types 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2Installing the Unit
Overview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package Checklist for HotWire Model 7924-A1 2-1. . . . . . . . . . . . . . . . . . . . . .
Connecting to the Network 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting Power to the Unit 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3Using Terminal and Switchpack Modes
Choosing an Interface Mode 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting to a System Terminal 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switching Between Terminal and Switchpack Modes 3-2. . . . . . . . . . . . . . . . .
4Customizing DSX-1-Compatible Units
Accessing Configuration Options 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Making Changes from the Terminal Interface 4-2. . . . . . . . . . . . . . . . . . . . . . .
Making Changes in Switchpack Mode 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying Switchpack Definitions 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying Line Build-Out Definitions 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
ii 7924-A2-GB20-30
October 1997
5Customizing V.35-Compatible Units
Accessing Configuration Options 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Making Changes from the Terminal Interface 5-2. . . . . . . . . . . . . . . . . . . . . . .
Making Changes in Switchpack Mode 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying Switchpack Definitions 5-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6Monitoring the Unit
What to Monitor 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Board Status 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Statistics 6-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Unit Information 6-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel LEDs 6-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DSX-1-Compatible Unit 6-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V.35-Compatible Unit 6-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7Testing
Detecting a Problem 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Understanding Loopback Tests 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local Loopbacks 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Loopbacks 7-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting and Stopping Loopbacks 7-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Resetting the Unit 7-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AWorksheets
Overview A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DSX-1-to-DSX-1 Configuration A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DSX-1-to-V.35 Configuration A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unframed Operation A-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Time Slot (DS0) Assignments A-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DSX-1-Compatible Units Configuration Worksheet A-5. . . . . . . . . . . . . . . . . .
V.35-Compatible Units Configuration Worksheet A-5. . . . . . . . . . . . . . . . . . . .

Contents
iii
7924-A2-GB20-30 October 1997
BCable Pin Assignments
Terminal Connection Cable Pin Assignments B-1. . . . . . . . . . . . . . . . . . . . . . .
HDSL Loop Connection Cable Pin Assignments B-2. . . . . . . . . . . . . . . . . . . . .
T1 Network Connection Cable Pin Assignments B-3. . . . . . . . . . . . . . . . . . . . .
V.35 Connection Cable Pin Assignments B-4. . . . . . . . . . . . . . . . . . . . . . . . . . .
CSwitchpacks and Jumpers
DSX-1-Compatible Units C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V.35-Compatible Units C-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary
Index

v
7924-A2-GB20-30 October 1997
About This Guide
Document Purpose and Intended Audience
This guide contains information needed to set up, configure, and operate HotWire
Model 7924-A1 T1 HDSL termination units. It is designed for central office
technicians or network engineers who have an understanding of the deployment
of digital subscriber line systems in a telephone company or private network
environment.
HotWire 7924 may be ordered either as a standalone unit (7924-A1-xxx) or as a
nest-mounted card (7924-B1-xxx) that fits in a HotWire 7900 nest. This guide
describes the installation and maintenance procedures for the standalone
version, Model 7924-A1-xxx.
Document Summary
Section Description
Chapter 1 About HotWire Model 7924 Termination Units . Describes the
features of each version of the Model 7924, and typical
configurations.
Chapter 2
Installing the Unit . Describes how to install the unit and
make connections.
Chapter 3
Using Terminal and Switchpack Modes. Provides
instructions for connecting a VT100-compatible terminal
user interface. Also describes how to make manual
configuration changes directly on the board hardware.
Chapter 4
Customizing DSX-1-Compatible Units . Provides instructions
for modifying configuration options by using the terminal
interface or DIP switches and jumpers on the board.
Chapter 5
Customizing V.35-Compatible Units . Provides instructions
for modifying configuration options by using the terminal
interface or DIP switches and jumpers on the board.

About This Guide
vi 7924-A2-GB20-30
October 1997
Section Description
Chapter 6 Monitoring the Unit. Describes how to monitor unit status,
LEDs, and network statistics. Also describes how to monitor
the status of the unit on the opposite side of the HDSL
connection.
Chapter 7
Testing . Provides information about available loopback
tests.
Appendix A
Worksheets. Contains all the configuration options, default
settings, and possible settings to use for planning.
Appendix B
Cable Pin Assignments. Contains connector and interface
details.
Appendix C
Switchpacks and Jumpers. Defines the switchpack and
jumper positions on the board hardware. Includes board
layout diagrams.
Glossary Defines acronyms and terms used in this document.
Index Lists key terms, acronyms, concepts, and sections in
alphabetical order.
Product-Related Documents
Document Number Document Title
7900-A2-GB20 HotWire Model 7900 Basic Maintenance Processor
User’s Guide
7900-A2-GB21 HotWire Model 7900 SNMP Maintenance Processor
User’s Guide
7900-A2-GN10 HotWire Model 7900 10-Slot Standalone Shelf
Installation Instructions
7900-A2-GN20 HotWire Model 7900 Nest and Options Installation
Guide
7920-A2-GB20 HotWire Models 7924 and 7925 T1 and E1 HDSL
Nest Card Termination Units User’s Guide
7925-A2-GB20 HotWire Model 7925 Standalone E1 HDSL
Termination Unit User’s Guide
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
7924-A2-GB20-30 October 1997
About HotWire Model 7924
Termination Units 1
HotWire 7924-A1 Models and Features
Products in the HotWire 7924 family provide “last mile/last kilometer” transport of
T1-compatible circuits between customer facilities and central site equipment
over 2- or 4-wire copper lines. The units can be used over distances substantially
exceeding traditional T1 spans and Canadian Standards Association (CSA) loop
standards.
HotWire 7924 standard features include:
V.35 or DSX-1 interface
Full support for T1 using two twisted-copper pairs
Full support for fractional T1 using one or two twisted-copper pairs
Automatic detection and compensation for inverted pairs and swapped loops,
which simplifies installation
Tolerance of bridged taps
Local and remote alarm surveillance
Local and remote T1 network and HDSL loop performance monitoring
HotWire 7924 may be ordered either as a standalone unit (7924-A1-xxx) or as a
nest-mounted card (7924-B1-xxx) that fits in a HotWire 7900 nest. This guide
describes the installation and maintenance procedures for the standalone
version, Model 7924-A1-xxx.
Up to ten standalone units may be installed in an optional HotWire 7900 10-Slot
Standalone Shelf. This is a convenient way to stack standalone units, using a
single power source.
To order additional product documentation, refer to
Warranty, Sales, and Service
Information
on page A at the beginning of this User’s Guide.