Paradyne HOTWIRE 7925 User manual

AREA CODE CHANGE
Please note that the area code for
Paradyne Corporation in Largo, Florida
has changed from 813 to 727.
For any Paradyne telephone number that
appears in this manual with an 813 area
code, dial 727 instead.

HOTWIRE
MODEL 7925 STANDALONE
E1 HDSL TERMINATION UNIT
USER’S GUIDE
Document No. 7925-A2-GB20-30
June 1997
PRELIMINARY DRAFT

Printed on recycled paper
A 7925-A2-GB20-30
PRELIMINARY DRAFT
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, sales, service, repair, 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 813-530-2340

Important Regulatory Information
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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 Regulatory Information
C 7925-A2-GB20-30
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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.
In order to maintain compliance with FCC Part 15 Rules, the ferrite choke must be installed on the V.35
cable. Refer to the installation instructions.
!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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Contents
About This Guide
Document Purpose and Intended Audience v. . . . . . . . . . . . . . . . . . . . . . . . .
Document Summary v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product-Related Documents vi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1About HotWire Model 7925 Standalone Termination Units
HotWire 7925 Models and Features 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Configurations 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User Interface Types 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2Installing the Unit
Package Checklist for HotWire Model 7925-A1 2-1. . . . . . . . . . . . . . . . . . . . . .
Connecting to the Network 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 G.703-Compatible Units
Accessing Configuration Options 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Making Changes from the Terminal Interface 4-2. . . . . . . . . . . . . . . . . . . . . . .
Changing the Line Build-Out 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Making Changes in Switchpack Mode 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying Switchpack Definitions 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying Line Build-Out Definitions 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
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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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G.703-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 Ending Loopbacks 7-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Resetting the Unit 7-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AWorksheets
Overview A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G.703-to-G.703 Configuration A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V.35-to-V.35 Configuration A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G.703-to-V.35 Configuration A-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G.703-Compatible Units Configuration Worksheet A-5. . . . . . . . . . . . . . . . . . .
V.35-Compatible Units Configuration Worksheet A-5. . . . . . . . . . . . . . . . . . . .

Contents
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BCable Pin Assignments
Terminal Connection Cable Pin Assignments B-1. . . . . . . . . . . . . . . . . . . . . . .
HDSL Loop Connection Cable Pin Assignments B-2. . . . . . . . . . . . . . . . . . . . .
E1 Network 120 Ohm Connection Cable Pin Assignments B-3. . . . . . . . . . . .
CSwitchpacks and Jumpers
G.703-Compatible Units C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V.35-Compatible Units C-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary
Index

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About This Guide
Document Purpose and Intended Audience
This guide contains information needed to set up, configure, and operate HotWire
Model 7925-A1 E1 HDSL termination units.
It is expected that readers of this document are central office and/or special
service installation technicians or network engineers who have an understanding
of digital subscriber line systems and High-bit-rate Digital Subscriber Loop
(HDSL) transmission systems plus the deployment of such systems in a
telephone company or private network environment.
Document Summary
Section Description
Chapter 1 About HotWire Model 7925 Standalone Termination Units .
Describes the features of each version of the Model 7925
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 G.703-Compatible Units . Provides procedures
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 procedures
for modifying configuration options by using the terminal
interface or DIP switches and jumpers on the board.
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.

About This Guide
vi 7925-A2-GB20-30
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Section Description
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 diagram.
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-GN20 HotWire Model 7900 Equipment Nest and Options
Installation Guide
7920-A2-GN21 HotWire Model 7900 Standalone Unit Nest
Installation Guide
7920-A2-GB20 HotWire Models 7924 and 7925 T1 & E1 HDSL
Nest Cards 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.

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About HotWire Model 7925
Standalone Termination Units 1
HotWire 7925 Models and Features
Products in the HotWire 7925 family provide “last mile/last kilometer” transport of
E1-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 E1 spans and ETSI loop standards.
HotWire 7925 standard features include:
V.35 or G.703 interface
Meeting the requirements of repeaterless E1 transmission on loops
exceeding standard specifications
Automatic detection and compensation for inverted pairs and swapped
loops – significantly simplifies installation
Tolerating bridged tap
Local and remote alarm surveillance and performance monitoring
HotWire 7925 may be ordered either as a standalone unit (7925-A1-xxx) or as a
nest-mounted card (7925-B1-xxx) that fits in a HotWire 7900 nest. This guide
describes the installation and maintenance procedures for the standalone
version, Model 7925-A1-xxx. See
Product-Related Documents in About This
Guide
for information on manuals for the nest and nest-mounted cards.

About HotWire Model 7925 Standalone Termination Units
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There are several versions of the Model 7925-A1, each supporting a different
interface (G.703 or V.35) and power supply (–48 Vdc, 220 Vac, or 120 Vac):
Model Number Features
7925-A1-201 2Mb/s G.703 compatible.
Connection to 120 Vac power supply.
7925-A1-202 2Mb/s V.35 compatible.
Connection to 120 Vac power supply.
7925-A1-301 2Mb/s G.703 compatible.
Connection to 230 Vac power supply.
7925-A1-302 2Mb/s V.35 compatible.
Connection to 230 Vac power supply.
7925-A1-501 2Mb/s G.703 compatible.
Direct connection to –48 Vdc power supply.
7925-A1-502 2Mb/s V.35 compatible.
Direct connection to –48 Vdc power supply.

About HotWire Model 7925 Standalone Termination Units
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Typical Configurations
HotWire Model 7925 standalone units can be used in campus applications where
long loop distances normally require the campus to contract with the local
telephone exchange carrier to deliver high speed services across the campus.
Figure 1-1 shows two typical campus applications where remote routers or
multiplexers are interconnected across a campus using two HotWire Model 7925
standalone units. In each pair, one unit is configured as a central site or central
office (CO) and the other is the remote (CP).
Each HotWire Model 7925 standalone unit is configured at the factory to operate
at the CP side of an E1 HDSL connection. However, you can easily reconfigure a
unit for use at the CO end, as would be necessary for the configurations in
Figure 1-1. (Conversely, HotWire Model 7925 nest cards are preconfigured for
CO operation.)
Multiplexer
G.703 Unit
G.703
Multiplexer
G.703
Cross-campus
2- or 4-wire
facility
Customer Premises Central Site
97-15292a
G.703 Unit
Router
V.35 Unit
V.35
LAN
Customer Premises
Router
V.35 Unit
V.35
LAN
Central Site
Cross-campus
2- or 4-wire
facility
97-15291
Figure 1-1. Campus Network Applications

About HotWire Model 7925 Standalone Termination Units
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HotWire Model 7925 standalone units are also ideal for delivering E1 services
from a central site to the customer premises over long loop distances without
repeaters.
Figure 1-2 shows a central office application with a HotWire Model 7900 Nest
containing HotWire Model 7925 nest cards. The nest cards each terminate a
single subscriber line in the CO. Each line is then converted to a G.703 interface
for connection to other central office equipment, such as a digital cross-connect
system (DCS).
PBX
G.703 Unit
Router
G.703
DCS
Management
Station
7900 Nest
Nest
Cards
V.35 Unit
V.35
Multiplexer
G.703 Unit
G.703
Telco 2- or 4-wire
facilities to
customer premises
Customer Premises
Central Site
97-15290
Figure 1-2. E1 Extension to Customer Premises

About HotWire Model 7925 Standalone Termination Units
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Cellular network providers must lease large numbers of E1 circuits in order to
connect remote cell sites to mobile telephone switching offices (MTSOs).
HotWire Model 7925 products provide an alternative to standard repeatered E1
services. Figure 1-3 depicts a typical cellular network access application.
Switch
Management
Station
7900 Nest
Nest
Cards
Telco 2- or 4-wire
facilities between
Cell Sites
and MTSO
Customer Premises
Central Site
G.703
G.703 Unit
G.703
G.703 Unit
G.703
Cell Site
Cell Site
Mobile Telephone
Switching Office (MTSO)
97-15293
Figure 1-3. Cellular Network Access
User Interface Types
There are three types of user interfaces to the standalone units:
VT100-compatible terminal interface (Terminal Mode, see Chapter 3)
Manual setting of switches and jumpers (Switchpack Mode, see Chapter 3)
Front Panel LED status indicators (see Chapter 6)

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Installing the Unit 2
Package Checklist for HotWire Model 7925-A1
Verify that your package contains the following:
-A HotWire Model 7925-A1 standalone unit
-VT100 Terminal Cable
-A 14′twisted pair network cable
-Power cord with power transformer (optional)
-Warranty card
-
V.35-compatible units only: a ferrite bead for RFI suppression
Connecting to the Network
"Procedure
1. Connect one end of the supplied 14′twisted-pair network cable into the rear
panel HDSL jack. Connect the other end to your HDSL network interface.
NOTE:
Do not use a flat VF network cable, as this may severely degrade the
performance of the termination unit. Use only twisted-pair network cable.
2.
V.35-compatible units only: Clamp the supplied ferrite bead around your V.35
cable, one inch from the end that plugs into the V.35 connector on the
HotWire unit. This bead suppresses RF interference and is required to meet
compliance standards.
3. Connect a V.35- or G.703-interface cable into the appropriate connector on
the rear panel. Connect the other end to your V.35 or G.703 equipment.

Installing the Unit
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Connecting Power to the Unit
HDSL 120Ohm
RCV XMT
75ΩE1/2048KB/S
48 VDC
97-15262
G.703-Compatible HotWire 7925 – Rear Panel
HDSL V.35
48 VDC
97-15264
V.35-Compatible HotWire 7925 – Rear Panel
As described in Chapter 1, there are several options for power cords, depending
on your power source (120 Vac, 230 Vac, or –48 Vdc).
Your package may also include a country-specific adapter. To obtain information
on the various power cord adapters available, refer to
Warranty, Sales, and
Service Information
on page A at the beginning of this User’s Guide.
If your package includes a 120 Vac or 230 Vac power cord with transformer: Plug
the power transformer into an available 115/230 Vac power outlet, running the
power lead to the unit housing. Neatly route the –48 Vdc cable to the housing,
securing the cable to the wall and providing strain relief. Connect the power lead
into the –48 Vdc plug on the rear panel.
If your package did not include a power cord: Connect the unit into an external
–48 Vdc power source.

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Using Terminal and Switchpack
Modes 3
Choosing an Interface Mode
You can make configuration changes either through the system terminal menus
(Terminal Mode) or by manually changing switches and jumpers on the board
(Switchpack Mode). Terminal Mode is the default setting.
In Terminal Mode:
You change configuration parameters by selecting menu options that appear
on a VT100-compatible terminal attached to the front panel of the termination
unit.
The unit is preconfigured at the factory for CP (customer premises) operation.
If you change the line build-out, you still need to move jumpers on the board
hardware.
In Switchpack Mode:
All configuration parameters are taken from the current setting of the
switchpacks and jumpers.
You must ensure that the switchpacks and jumpers are set as desired. (They
are not preconfigured at the factory.)
You can still display information about the unit from the terminal.
Any changes you had made in Terminal Mode are lost when you change to
Switchpack Mode.
Connecting to a System Terminal
An optional system maintenance terminal may be attached to your Model 7925
standalone termination unit through the modular jack on the front panel. You may
have terminals attached to both endpoints (HTU-C and HTU-R).
The system terminal must be a VT100-compatible terminal or emulation software
on a PC.

Using Terminal and Switchpack Modes
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Connect the 9-pin end of the terminal cable into a COM port on your PC. Plug the
other end into the modular jack on the front panel. If your PC requires a 25-pin
connector to the COM port, see Appendix B,
Cable Pin Assignments , for the
correct cable pinouts.
Make sure the terminal parameters on your PC are set to:
H9600 baud
H8 bit
Hno parity
H1 stop bit
Hno flow control
Press Return from your VT100-compatible terminal window to activate the main
menu for the attached unit. The system runs diagnostics and status checks as it
comes up. After a few moments, the Main Menu screen will appear on your
VT100-compatible terminal. Menus are described in Chapters 4 and 5for the
G.703 and V.35 units, respectively.
Switching Between Terminal and Switchpack Modes
The following procedure is used to change the operating mode of the unit to
either Terminal Mode (the default setting) or Switchpack Mode. Refer to
Chapter 4 (for G.703-compatible units) or Chapter 5 (for V.35-compatible units)
for information on changing configuration options using either of these modes.
"Procedure
To change the mode:
1. Power down the unit and remove the enclosure cover, exposing the circuit
board. Use electrostatic discharge (ESD) protection when handling the circuit
board.
2. See Appendix C,
Switchpacks and Jumpers , for jumper locations on your
unit’s board.
3. Locate the jumper header.
— Use P11 for G.703-compatible units.
— Use P8 for V.35-compatible units.
4. Place the jumper in the correct position for the desired mode.
— Switchpack Mode is enabled by placing the jumper on Pins 2 and 3.
— Terminal Mode is enabled by placing the jumper on Pins 1 and 2.
5.
If you are enabling Switchpack Mode: You must set the switchpacks and
jumpers to your desired configuration. Refer to
Switchpacks and Jumpers,
Appendix C.
6. Power up the board to reset and enable the new configuration.

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Customizing G.703-Compatible
Units 4
Accessing Configuration Options
This chapter provides instructions on how to change configuration options for
HotWire 7925 standalone units that are G.703-compatible. Chapter 5 provides
similar information for V.35-compatible units.
Configuration option settings determine how the unit operates. You can change a
unit’s configuration options by:
Selecting the Board Configuration branch of the Main Menu while in Terminal
Mode.
Changing switch pack and jumper settings on the board hardware while in
Switchpack Mode.
The Main Menu for G.703-compatible units appears as follows:
Command→G123
ATTX–CP E1 LOOP AB
E1 HDSL HTUR Main Menu
1) Board Status
2) Performance Monitor
3) Channel Blocking
4) Board Configuration
5) Board Reset
6) Local loopback
7) Remote loopback
8) HTUC Menu
?) Prints this Menu
Command→