Page 1
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.
Page 2
HOTWIRE
MODELS 7924 AND 7925
T1 AND E1 HDSL NEST CARD
TERMINATION UNITS
USER’S GUIDE
Document No. 7920-A2-GB20-10
August 1997
Page 3
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 W eb 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
Printed on recycled paper
A
August 1997
7920-A2-GB20-10
Page 4
Important Regulatory Information
Important Safety Instructions
1. Read and follow all warning notices and instructions marked on the product or included in the manual.
2. This product is intended to be used with a 3-wire grounding type plug – a plug which has a grounding pin. This is
a safety feature. Equipment grounding is vital to ensure safe operation. Do not defeat the purpose of the
grounding type plug by modifying the plug or using an adapter.
Prior to installation, use an outlet tester or a voltmeter to check the ac receptacle for the presence of earth
ground. If the receptacle is not properly grounded, the installation must not continue until a qualified electrician
has corrected the problem.
If a 3-wire grounding type power source is not available, consult a qualified electrician to determine another
method of grounding the equipment.
3. Slots and openings in the cabinet are provided for ventilation. To ensure reliable operation of the product and to
protect it from overheating, these slots and openings must not be blocked or covered.
4. Do not allow anything to rest on the power cord and do not locate the product where persons will walk on the
power cord.
5. 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.
6. 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.
7. 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.
8. 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.
9. 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 un-insulated 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.
7920-A2-GB20-10 August 1997
B
Page 5
Important Regulatory Information
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.
C
August 1997
7920-A2-GB20-10
Page 6
Contents
About This Guide
Document Purpose and Intended Audience iii. . . . . . . . . . . . . . . . . . . . . . . . .
Document Summary iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product-Related Documents iv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 About HotWire Models 7924 and 7925 Nest Card Termination
Units
HotWire Model 7924 and 7925 Features 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . .
HotWire Model 7924 Standard Features 1-1. . . . . . . . . . . . . . . . . . . . . . . .
Hotwire Model 7925 Standard Features 1-2. . . . . . . . . . . . . . . . . . . . . . . .
HotWire Model 7924 Typical Configurations 1-2. . . . . . . . . . . . . . . . . . . . . . . .
HotWire Model 7925 Typical Configurations 1-4. . . . . . . . . . . . . . . . . . . . . . . .
User Interfaces 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Installing HotWire Nest Card Termination Units
Package Checklist 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspect the Shipping Container 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing Nest Card Termination Units 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing Nest Filler Panels 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Customizing HotWire 7924 Nest Card Termination Units
Changing Your Configuration Options 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switchpack and Jumper Locations 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switchpack Definitions 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jumper Positions 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Customizing HotWire 7925 Nest Card Termination Units
Changing Your Configuration Options 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switchpack and Jumper Locations 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switchpack Definitions 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jumper Positions 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7920-A2-GB20-10
August 1997
i
Page 7
Contents
5 Monitoring Nest Card Termination Units
What to Monitor 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel LEDs 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A HotWire Model 7924 Worksheets
Overview A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DSX-1 to DSX-1 Configuration A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DSX-1 Nest-to-Standalone V.35 Configuration A-2. . . . . . . . . . . . . . . . . . . . . .
Unframed Operation A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HotWire 7924 Configuration Worksheet A-4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
B HotWire Model 7925 Worksheets
Overview B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G.703-to-G.703 Configuration B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G.703 to V.35 Configuration B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HotWire 7925 Configuration Worksheet B-4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary
Index
ii
August 1997
7920-A2-GB20-10
Page 8
About This Guide
Document Purpose and Intended Audience
This guide describes the configuration, installation, and maintenance procedures
for HotWire Model 7924-B1 and 7925-B1 T1 and E1 HDSL Nest Card
Termination Units.
It is expected that readers of this document are central-site 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
Chapter 2
Chapter 3
Chapter 4
Chapter 5
About HotWire Models 7924 and 7925 Nest Card
Termination Units
and 7925 termination units and provides typical
configurations.
Installing HotWire Nest Card Termination Units
the procedures for installing the HotWire Model 7900 nest
card termination units and nest filler panels.
Customizing HotWire 7924 Nest Card Termination Units.
Provides procedures for modifying configuration options by
using the terminal interface or DIP switches and jumpers on
the nest card.
Customizing HotWire 7925 Nest Card Termination Units
Provides procedures for modifying configuration options by
using the terminal interface or DIP switches and jumpers on
the board.
Monitoring Nest Card Termination Units.
monitor LEDs, unit, and network status.
. Describes the features of HotWire 7924
. Describes
.
Describes how to
7920-A2-GB20-10
August 1997
iii
Page 9
About This Guide
Section Description
Appendix A
Appendix B
Glossary Defines the acronyms and terms used in this document.
Index Lists the key terms, acronyms, and concepts, in alphabetical
Product-Related Documents
Document Number Document Title
7900-A2-GB20
7900-A2-GB21
7900-A2-GK10
HotWire Model 7924 Worksheets.
configuration options, default settings, and possible settings
to use for planning.
HotWire Model 7925 Worksheets.
configuration options, default settings, and possible settings
to use for planning.
order.
Contains all the
Contains all the
HotWire Model 7900 Basic Maintenance Processor
User’s Guide
HotWire Model 7900 SNMP Maintenance Processor
User’s Guide
HDSL Connection Considerations Special Notice
7900-A2-GN20
HotWire Model 7900 Nest and Options Installation
Guide
7910-A2-GB20
HotWire Models 7914 and 7915 T1 & E1 SDSL Nest
Cards User’s Guide
7924-A2-GB20
HotWire Model 7924 Standalone T1 HSDL
Termination Unit Users Guide
7925-A2-GB20
HotWire Model 7925 Standalone E1 HSDL
Termination Unit Users Guide
To order additional product documentation, refer to
Information
on page A at the beginning of this User’s Guide.
Warranty, Sales, and Service
iv
August 1997
7920-A2-GB20-10
Page 10
About HotWire Models 7924 and
7925 Nest Card Termination Units
HotWire Model 7924 and 7925 Features
Products in the HotWire 7900 family provide “last mile/last kilometer” transport of
T1- and E1-compatible circuits between customer facilities and central-site
equipment over 2- or 4-wire copper lines. These termination units can be used
over distances substantially exceeding traditional T1 and E1 spans and European
Telecommunications Standards Institute (ETSI) loop standards.
This chapter provides a general overview of the HotWire Models 7924 and 7925
nest card termination units, including standalone units (A1) and nest-mounted
termination units (B1).
1
HotWire Model 7924 Standard Features
DSX-1 interface
Full support for T1 using two twisted-copper pairs
Full support for fractional T1 using one or two twisted-copper pairs
Meets the requirements of repeaterless T1 transmission on loops exceeding
standard specifications
Automatic detection of and compensation for inverted pairs and
swapped loops, significantly simplifying installation
Local and remote alarm surveillance
Local and remote T1 and HDSL performance monitoring
7920-A2-GB20-10
August 1997
1-1
Page 11
Chapter:ChapName
Hotwire Model 7925 Standard Features
G.703 interface
Meets the requirements of repeaterless E1 transmission on loops exceeding
standard specifications (up to 10 km on a 0.9 mm wire)
Automatic detection and compensation for inverted pairs and swapped
loops – significantly simplifies installation
Local and remote alarm surveillance and performance monitoring
Local and remote E1 and HDSL performance monitoring
You can order HotWire 7924 and 7925 products as standalone units
(7924-A1/7925-A1) or as nest-mounted circuit card assemblies (CCAs)
(7924-B1/7925B1) that fit in the HotWire 7900 Nest. This guide describes the
installation and maintenance procedures for the nest-mounted CCAs,
Models 7924-B1 and 7925-B1. See
for information on user manuals for the standalone units.
Guide
Product-Related Documents
in
About This
HotWire Model 7924 Typical Configurations
HotWire Model 7924 termination 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 private-line services across the campus.
Figure 1-1 shows a central-site application with a HotWire 7900 Nest containing
HotWire Model 7924 Nest Card Termination Units. Each nest card terminates a
single subscriber line in the central site. Each line is then converted to a DSX-1
interface for connection to other central-site equipment, such as a digital
cross-connect system (DCS).
PBX
DSX-1
DSX-1 Unit
Telco 2- or 4-wire
facilities to
customer premises
Router
Multiplexer
V.35
V.35 Unit
DSX-1
DSX-1 Unit
Nest
Cards
7900 Nest
Central Site
Mgmt
Station
DCS
Customer Premises
Figure 1-1. T1 Extension to Customer Premises
1-2
August 1997
97-15294
7920-A2-GB20-10
Page 12
About HotWire Models 7924 and 7925 Nest Card Termination Units
Cellular network providers must lease large numbers of T1 circuits in order to
connect remote cell sites to mobile telephone switching offices (MTSOs).
HotWire Model 7924 products provide an alternative to standard repeatered T1
services. Figure 1-2 depicts a typical cellular network access application.
Cell Site
DSX-1
DSX-1 Unit
Cell Site
DSX-1
DSX-1 Unit
Customer Premises
Telco 2- or 4-wire
facilities
between Cell Sites
and MTSO
Mobile Telephone
Switching Office (MTSO)
Nest
Cards
7900 Nest
Central Site
Mgmt
Station
DSX-1
Switch
97-15297
Figure 1-2. Cellular Network Access
Figure 1-3 shows two typical campus applications where remote routers or
multiplexers are interconnected across a campus using two HotWire Model 7924
standalone units. In each pair, one unit is configured as a central site and the
other as the remote customer premises.
PBX
DSX-1
Cross-campus
2- or 4-wire
facility
PBX
DSX-1
7920-A2-GB20-10
DSX-1 Unit
Central Site
97-15295
Multiplexer
DSX-1
DSX-1 Unit
Central Site
97-15296
Customer Premises
Multiplexer
DSX-1
DSX-1 Unit
Customer Premises
DSX-1 Unit
Cross-campus
2- or 4-wire
facility
Figure 1-3. Campus Network Applications
HotWire Model 7924 standalone units are ideal for delivering T1 services from a
central site to the customer premises over long loop distances without repeaters.
August 1997
1-3
Page 13
About HotWire Models 7924 and 7925 Nest Card Termination Units
HotWire Model 7925 Typical Configurations
Figure 1-4 shows a central-site application with a HotWire 7900 Nest containing
HotWire Model 7925 nest card termination units. The nest card termination units
each terminate a single subscriber line in the central site. Each line is then
converted to a G.703 interface for connection to other central-site equipment,
such as a digital cross-connect system (DCS).
PBX
G.703
G.703 Unit
Telco 2- or 4-wire
Router
Multiplexer
V.35
G.703
Customer Premises
V.35 Unit
G.703 Unit
facilities to
customer premises
Nest
Cards
7900 Nest
Central Site
Management
Station
DCS
97-15290
Figure 1-4. E1 Extension to Customer Premises
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 1-5 depicts a typical G.703 cellular network access application.
Cell Site
G.703
G.703 Unit
Cell Site
G.703
G.703 Unit
Customer Premises
Telco 2- or 4-wire
facilities between
Cell Sites
and MTSO
Mobile Telephone
Switching Office (MTSO)
Nest
Cards
Management
Station
G.703
7900 Nest
Central Site
Switch
97-15293
Figure 1-5. Cellular Network Access
1-4
August 1997
7920-A2-GB20-10
Page 14
About HotWire Models 7924 and 7925 Nest Card Termination Units
HotWire Model 7925 termination 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 private line services across the campus.
Figure 1-6 shows two typical campus applications where remote routers or
multiplexers are interconnected across a campus using two HotWire Model 7925
termination units. In each pair, one unit is configured as a central site and the
other as the customer premises.
Cross-campus
Multiplexer
G.703
2- or 4-wire
facility
Multiplexer
G.703
G.703 Unit
Customer Premises
LAN
Router
Customer Premises
V.35
V.35 Unit
Cross-campus
2- or 4-wire
facility
G.703 Unit
V.35 Unit
Central Site
Central Site
V.35
Router
97-15292a
LAN
97-15291
Figure 1-6. Campus Network Applications
HotWire Model 7925 termination units are ideal for delivering E1 services from a
central site to the customer premises over long loop distances without repeaters.
Each HotWire Model 7924 and 7925 nest card termination unit is configured at
the factory to operate at the central site (CO) of a T1 or E1 HDSL connection.
However, you can reconfigure the unit for customer premises (CP) operation if
required.
7920-A2-GB20-10
August 1997
1-5
Page 15
About HotWire Models 7924 and 7925 Nest Card Termination Units
User Interfaces
There are two types of user interfaces to the nest card termination units:
Switches and jumpers (refer to Chapters 3 and 4)
Front Panel LED status indicators (refer to Chapter 5)
If you have an HTU-M or HTU-S maintenance processor, you can also monitor
nest card termination units and network status using:
The HTU-M or HTU-S front panel LEDs
A VT100-terminal connected to the HTU-M or HTU-S maintenance
processor.
1-6
August 1997
7920-A2-GB20-10
Page 16
Installing HotWire Nest Card
Termination Units
Package Checklist
Verify that your package contains the following:
- The correct number of HotWire Models 7924 or 7925 nest card termination
units (verify this with your packing list)
- Warranty card
2
Inspect the Shipping Container
Inspect the shipping container for signs of damage. Specific signs to check for
are:
H Major tears or puncture holes on the sides of the container
H Splits in the seams
H Corner damage or any additional signs of the container having been dropped
If the shipping container shows signs of damage, report this immediately to your
shipping or service representative.
7920-A2-GB20-10
August 1997
2-1
Page 17
Installing HotWire Nest Card Termination Units
Installing Nest Card Termination Units
It is assumed that you have already installed the HotWire Model 7900 Nest and
associated power supply in a standard equipment rack, and that all network
connections have been made. Installation of the optional HotWire 7900 Basic
Maintenance Processor (HTU-M or HTU-S) is described in a separate user’s
guide. Refer to
Procedure
To install the nest card:
1. Use electrostatic discharge (ESD) protection when handling the electronic
components. Remove the card from any protective packaging.
2. Align the circuit board with the top and bottom card guides of the next
available card slot:
— Slot 1 if no maintenance processor option is installed
— Slot 2 if an HTU-S is installed in Slot 1
— Slot 3 if an HTU-M is installed in Slots 1 and 2
Product-Related Documents
in
About This Guide
.
3. Slide the nest card into the slot until the backplane connector plug is seated
firmly into the backplane.
4. Tighten retaining screws at the top and bottom of the nest card front panel.
Maintenance Processor Option
(HTU-M) Slots 1 & 2
OK
FAIL
SELECT
NETWORK
NETWORK
NETWORK
LOS/AIS/BER
LOCAL
REMOTE
REMOTE
LOOP BK
SYSTEM
LOS / BER
NETWORK
LOS/AIS/BER
LOS/AIS/BER
LOCAL
LOCAL
REMOTE
REMOTE
REMOTE
REMOTE
LOOP BK
LOOP BK
SYSTEM
SYSTEM
PWR
PWR
PWR
FAIL
FAIL
FAIL
HDSL
HDSL
HDSL
LOS / BER
LOS / BER
LOOP 1
LOOP 1
LOOP 1
LOOP 2
LOOP 2
LOOP 2
NETWORK
LOS/AIS/BER
LOCAL
REMOTE
REMOTE
LOOP BK
SYSTEM
PWR
FAIL
LOS / BER
HDSL
LOOP 1
LOOP 2
LOS/AIS/BER
NEXT
LOCAL
REMOTE
REMOTE
LOOP BK
ALARMS
MAJOR
SYSTEM
MINOR
PWR
ABNORM
FAIL
ACO
ACTIVE
HDSL
LOS / BER
LOOP 1
LOOP 2
2-2
August 1997
97-15440
7920-A2-GB20-10
Page 18
Installing Nest Filler Panels
Nest filler panels are required to be installed in slots that do not contain nest
cards.
!
WARNING:
Front Panel Fillers are required to be installed for EMI safety purposes.
Install nest filler panels to cover all nest card slots that do not contain
nest cards.
Procedure
To install nest filler panels:
1. Align the filler panel with the retaining screw holes located at the top and
bottom of the nest.
2. Tighten filler panel retaining screws.
3. Repeat until all empty nest-card slots are covered.
Installing HotWire Nest Card Termination Units
97-15537
7920-A2-GB20-10
August 1997
2-3
Page 19
Customizing HotWire 7924 Nest
Card Termination Units
Changing Your Configuration Options
This chapter provides instructions on how to change or verify the configuration
options for DSX-1-compatible HotWire 7924 T1 nest cards. Chapter 4 provides
configuration options for G.703-compatible HotWire 7925 E1 nest cards.
Configuration option settings determine how the unit operates. You can change
the unit’s configuration options by changing switchpack and jumper settings on
the circuit card assembly.
3
Procedure
To change and verify configuration options:
1. Loosen retaining screws at the top and bottom of the nest card.
2. Use electrostatic discharge (ESD) protection when handling the electronic
components. Remove the card from the nest.
3. Use Figure 3-1 to locate switchpack S1.
4. Place the switchpack DIP switches in the ON or OFF position for each
desired configuration option. For example, to change a unit’s card type from
CO to CP, move DIP switch 1 on switchpack 1 to the OFF position.
— P12 is positioned at the factory on Pins 1–2 (switchpack S1 disabled). To
enable switchpack S1, move the jumper on P12 to Pins 2–3.
5. Return the nest card to the nest.
6. Tighten retaining screws at the top and bottom of the nest card.
7920-A2-GB20-10
August 1997
3-1
Page 20
Customizing HotWire 7924 Nest Card Termination Units
Switchpack and Jumper Locations
Use Figure 3-1 to locate HotWire 7924 nest card jumpers and switchpack S1.
P12
Front
Panel
LEDs
P6
P2
P1
U5
Last Two Digits Indicate
Firmware Revision Number
810P031207
xxx
xxxxxx
P3
P11
97-15419-01
P13
Switchpack S1
ON
12345
Position
1 OFF = CP
2 OFF = AMI line encoding
3 OFF = Loops A and B
4, 5, 6 000 = 0 to 133 feet
7, 8 00 = Unframed *
* Some earlier units do not support
unframed operation with V.35compatible units. To determine if your
DSX-1-compatible unit supports
unframed operation when connected
V.35-compatible standalone unit,
to a
refer
Appendix A.
678
Setting
ON = CO
ON = B8ZS line encoding
ON = Loop A
100 = 133 to 266 feet
010 = 266 to 399 feet
1 10 = 399 to 533 feet
001 = 533 to 655 feet
01 = D4
11 = ESF
Unframed Operation
Default in Bold
in
Figure 3-1. HotWire 7924 Nest Card Switchpack and Jumper Locations
Pin 1 on jumpers is labeled on the board.
The ON position is labeled on the switchpack.
The jumper on P12 is positioned at the factory on Pins 1–2 (switchpack S1
disabled). To enable switchpack S1, move the jumper on P12 to Pins 2–3.
Positions 4, 5, and 6 work as a trio. Set position 4 to the first digit, position 5
to the second digit, and position 6 to the last digit. For example, set 4 and 5
ON and 6 OFF for 399–533 feet.
Positions 7 and 8 on Switchpack S1 work as a pair. Set position 7 to the first
digit and position 8 to the second digit.
3-2
August 1997
7920-A2-GB20-10
Page 21
Switchpack Definitions
Change configuration options by moving switchpack S1 DIP switches on the nest
card hardware.
Switchpack S1 Definitions
Customizing HotWire 7924 Nest Card Termination Units
Position # . . . Allows you to . . .
1 Control whether the board is an HTU-C (CO) or an HTU-R (CP).
OFF = CP
ON = CO
2 Control enabling and disabling of zeroes suppression in the line code.
OFF = AMI line encoding
ON = B8ZS line encoding
3 Change the DSL local loop configuration.
OFF = Loops A and B enabled
ON = Loop A enabled
4, 5, and 6 Change Line Build-out configuration.
000 = 0 to 133 feet
100 = 133 to 266 feet
010 = 266 to 399 feet
1 10 = 399 to 533 feet
001 = 533 to 655 feet
Positions 4, 5, and 6 form a three-digit binary number where ON
represents a value of 1 and OFF represents a value of 0. For example,
set 4 and 5 ON and 6 OFF for 399 to 533 feet.
7, 8 Control whether data is transmitted with or without framing.
00 = Unframed *
01 = D4
11 = ESF
Positions 7 and 8 form a two-digit binary number where ON represents
a value of 1 and OFF represents a value of 0. For example, set 7 OFF
and 8 ON for D4 framing.
NOTE: Operating unframed while T1 service is framed will result
in the loss of reporting certain performance statistics, for
example, CRC.
Configure your HotWire equipment to match the T1
network. If your T1 service is framed, configure your
HotWire 7900 nest cards as framed. If your T1 service is
unframed, configure your HotWire 7900 nest cards as
unframed.
Default in Bold
* Some earlier units do not support unframed operation with V.35-compatible units. To
determine if your DSX-1-compatible unit supports unframed operation when
connected to a
Appendix A,
7920-A2-GB20-10
V.35-compatible standalone unit, refer to
HotWire Model 7924 Worksheets
August 1997
.
Unframed Operation
in
3-3
Page 22
Customizing HotWire 7924 Nest Card Termination Units
Jumper Positions
The following table provides the correct default jumper positions for your nest
card.
Jumper
P1 No jumper
P2 1–2
P3 2–3
P6 No jumper
P1 1 1–2
P12 1–2
P13 1–2
Position
3-4
August 1997
7920-A2-GB20-10
Page 23
Customizing HotWire 7925 Nest
Card Termination Units
Changing Your Configuration Options
This chapter provides instructions on how to change or verify configuration
options for G.703-compatible HotWire 7925 E1 nest cards. Chapter 3 provides
configuration options for DSX-1-compatible HotWire 7924 T1 nest cards.
Configuration option settings determine how the unit operates. You can change
the unit’s configuration options by changing switchpack and jumper settings on
the nest card.
4
Procedure
To change or verify configuration options:
1. Loosen retaining screws at the top and bottom of the nest card.
2. Use electrostatic discharge (ESD) protection when handling the electronic
components. Remove the card from the nest.
3. Use Figure 4-1 to locate switchpack S1.
4. Place the switchpack DIP switches in the ON or OFF position for each
desired configuration option. For example, to change a unit’s card type from
CO to CP, move DIP switch 1 on switchpack 1 to the OFF position.
— The jumper on P12 is positioned at the factory on Pins 1–2 (switchpack
S1 disabled). To enable switchpack S1, move the jumper on P12 to
Pins 2–3.
5. Return the nest card to the nest.
6. Tighten retaining screws at the top and bottom of the nest card.
7920-A2-GB20-10
August 1997
4-1
Page 24
Customizing HotWire 7925 Nest Card Termination Units
Switchpack and Jumper Locations
Use Figure 4-1 to locate HotWire 7925 nest card jumpers and switchpack S1.
P12
Front
Panel
LEDs
P6
P2
P1
P11
P3
P4
P5
P13
Switchpack S1
ON
12345
Position
1 OFF = CP
2 OFF = AMI line encoding
3 OFF = Loops A and B
4 Unused
5 OFF = 75 ohm line
6 Unused
7 Unused
8 OFF = Unframed
678
Setting
ON = CO
ON = HDB3 line encoding
ON = Loop A
build-out
ON = 120 ohm line
build-out
ON = Framed
Default in Bold
4-2
97-15527
Figure 4-1. HotWire 7925 Nest Card Switchpack Locations and Jumper Positions
Pin 1 on jumpers is labeled on the board.
The ON position is labeled on the switchpack.
The jumper on P12 is positioned at the factory on Pins 1–2 (switchpack S1
disabled). To enable switchpack S1, move the jumper on P12 to Pins 2–3.
August 1997
7920-A2-GB20-10
Page 25
Switchpack Definitions
Change configuration options by moving switchpack S1 DIP switches on the nest
card hardware.
Switchpack S1 Definitions
Customizing HotWire 7925 Nest Card Termination Units
Position # . . . Allows you to . . .
1 Control whether the board is an HTU-C (CO) or an HTU-R (CP).
OFF = CP
ON = CO
2 Control enabling and disabling of zeroes suppression in the line code.
OFF = AMI line encoding
ON = HDB3 line encoding
3 Change HDSL Local Loop configuration.
OFF = Loops A and B enabled
ON = Loop A enabled
4 Unused
5 Change the Line Build-out configuration.
OFF = 75 ohm line build-out
ON = 120 ohm line build-out
6 Unused
7 Unused
8 Control whether the data is transmitted with or without framing.
OFF = Unframed
ON = Framed
NOTE: Operating unframed while E1 service is framed will result in
the loss of reporting certain performance statistics, for
example, CRC.
Configure your HotWire equipment to match the E1
network. For example, if your E1 service is framed,
configure your HotWire 7900 nest cards as framed. If your
E1 service is unframed, configure your HotWire 7900 nest
cards as unframed.
Default in Bold
7920-A2-GB20-10
August 1997
4-3
Page 26
Customizing HotWire 7925 Nest Card Termination Units
Jumper Positions
The following table provides the correct default jumper positions for your nest
card.
Jumper
P1 No jumper
P2 1–2
P3 2–3
P4 1–2
P5 1–2
P6 No jumper
P1 1 1–2
P12 1–2
P13 1–2
Position
4-4
August 1997
7920-A2-GB20-10
Page 27
Monitoring Nest Card
Termination Units
What to Monitor
Front panel LEDs on each HotWire Model 7924 and 7925 Nest Card Termination
Unit provide status information about the nest card, HDSL local loop, and the T1
or E1 network interface. This chapter presents information on how to monitor and
interpret the HotWire 7924 and 7925 nest card termination unit front panel LEDs.
You can also monitor loop status, change operational parameters, or initiate
loopback testing from the Maintenance Processor (HTU-M or HTU-S) Front Panel
or from a VT100-compatible terminal connected to the HTU-M or HTU-S by using
the Maintenance, Performance, or Status options from the Main Menu.
5
The HTU-M and HTU-S maintenance processors:
Monitor the status of up to 62 or 63 (HTU-S option only) nest card termination
units
Store the performance history of individual circuits and network status
Monitor and display individual circuit and loop status on the maintenance
processor front panel
Display individual circuit and loop status on the VT100-compatible terminal or
PC running a VT100-compatible terminal emulator program
The HTU-S maintenance processor:
Interfaces with and reports circuit status to your Network Management
System using Simple Network Management Protocol (SNMP)
For more information on the maintenance processor, refer to the
Model 7900 Basic Maintenance Processor User’s Guide
.
HotWire
7920-A2-GB20-10
August 1997
5-1
Page 28
Monitoring Nest Card Termination Units
Front Panel LEDs
When power is applied to the nest card, the top three LEDs (LOCAL, REMOTE,
and LOOP BK) blink once in sequence and then remain off, indicating a
successful start configuration.
NETWORK
LOS/AIS/BER
LOCAL
REMOTE
LOOP BK
SYSTEM
PWR
FAIL
HDSL
LOS / BER
LOOP A
LOOP B
LED . . .
Blinks or remains on when . . .
LOCAL The local T1 or E1 interface has a loss of signal.
REMOTE The remote T1 or E1 interface has a loss of signal.
LOOP BK A loopback has been initiated for testing the equipment connected to this
unit.
PWR Power is applied to the unit.
FAIL The processor has halted and repairs are required.
LOOP A HDSL Loop A has failed. (The LED will blink at board power up until the
loop has been synchronized.)
LOOP B HDSL Loop B has failed or has been disabled. (The LED will blink at
board power up until the loop has been synchronized.)
5-2
97-15441
August 1997
7920-A2-GB20-10
Page 29
HotWire Model 7924 Worksheets
Overview
The following worksheets illustrate HotWire 7924-B1 configuration settings based
on the types of connection. There are two connection combinations for HotWire
7924 nest card termination units:
DSX-1-compatible units on both ends
V.35-compatible unit on the customer premises (CP) end, DSX-1-compatible
unit on the central office (CO) end
A
DSX-1 to DSX-1 Configuration
Cell Site
DSX-1
DSX-1 Unit
Customer Premises
Telco 2- or 4-wire
facilities between
Cell Sites
and MTSO
Mobile Telephone
Switching Office (MTSO)
Nest
Cards
7900 Nest
Central Site
Mgmt
Station
DSX-1
Switch
97-15405
7920-A2-GB20-10
August 1997
A-1
Page 30
HotWire Model 7924 Worksheets
To connect two DSX-1-compatible units, configure the units as follows (factory
defaults are in bold):
Configuration
Option
Card Type CP CO
Loops Enabled Dual (Loops A and B) or
T1 Line Encode B8ZS or AMI Must be same as CP side
Framing D4, Extended Superframe,
Line Build-Out 1) 0 to 133 feet
DSX-1-Compatible Unit
(Customer Premises)
Single (Loop A)
or Unframed
2) 133 to 266 feet
3) 266 to 399 feet
4) 399 to 533 feet
5) 533 to 655 feet
DSX-1 Nest-to-Standalone V.35 Configuration
Telco 2- or 4-wire
facilities to
Router
Customer Premises
V.35
V.35 Unit
customer premises
DSX-1-Compatible Unit
(Central Site)
Must be same as CP side
D4, Extended Superframe, or
Unframed
1) 0 to 133 feet
2) 133 to 266 feet
3) 266 to 399 feet
4) 399 to 533 feet
5) 533 to 655 feet
Nest
Cards
7900 Nest
Central Site
Mgmt
Station
DCS
97-15406
To connect a V.35-compatible standalone unit on the CP side and a
DSX-1-compatible nest unit on the CO side, configure the units as follows (factory
defaults are in bold):
Configuration
Option
Card Type CP CO
Loops Enabled Dual (Loops A and B) or
Payload Rate 1 – 9 (64 – 1536 Kbps).
A-2
V.35-Compatible Unit
(Customer Premises)
Single (Loop A)
Options 8 and 9 are only
available if loops A and B
are enabled.
DSX-1-Compatible Unit
(Central Site)
Must be same as CP side
N/A
7920-A2-GB20-10August 1997
Page 31
HotWire Model 7924 Worksheets
Configuration
Option
Framing
T1 Line Encode N/A B8ZS or AMI
Line Build-Out N/A 1) 0 to 133 feet
1
1
Refer to
UnFramed Operation
V.35-Compatible Unit
(Customer Premises)
N/A If the payload rate is 1544 Kbps,
for unframed operation considerations.
DSX-1-Compatible Unit
(Central Site)
use unframed.
If the payload rate is less than 1544 Kbps,
use D4 or ESF.
2) 133 to 266 feet
3) 266 to 399 feet
4) 399 to 533 feet
5) 533 to 655 feet
When the V.35 payload rate is set for less than 1536 Kbps, that payload rate
determines which T1 DS0s are used, as follows:
V.35 Payload Rate
1 (64 Kbps) 1
2 (128 Kbps) 1, 2
3 (192 Kbps) 1 – 3
DSX-1 T1 DS0s Used
Unframed Operation
4 (256 Kbps) 1 – 4
5 (384 Kbps) 1 – 6
6 (512 Kbps) 1 – 8
7 (768 Kbps) 1 – 12
8 (1024 Kbps) 1 – 16
Some earlier units do not support unframed operation when connected to a
V.35-compatible unit. To determine whether or not your DSX-1 nest card
termination unit supports unframed operation when connected to a
V.35-compatible unit, all three of the following conditions must be true:
1. The DSX-1 nest card termination unit must have a firmware revision number
of 7 or higher.
The firmware revision number is the last two digits on the first line of the label
located on the nest card EPROM located at U5. Refer to Figure 3-1 in
Chapter 3, for the location of the EPROM.
7920-A2-GB20-10
August 1997
A-3
Page 32
HotWire Model 7924 Worksheets
2. The V.35-compatible standalone unit must have an HDSL firmware revision
number of 3 or higher.
To determine the firmware revision number of the V.35 standalone unit, look
at the label on the bottom of the standalone unit that has the “CE” and “CSA”
logos. The second row of numbers on this label should be”900P005705” or
higher. The last two digits of this number (05) indicate the hardware revision
number.
3. The V.35-compatible standalone unit must have a hardware revision number
of 5 or higher.
To determine the hardware revision number, look at the label on the bottom of
the standalone unit that has the “CE” and “CSA” logos. The second row of
numbers on this label should be “900P005705” or higher. The last two digits
of this number (05) indicate the hardware revision number.
HotWire 7924 Configuration Worksheet
Nest Card Configuration
Configuration Option Settings
HDSL Card Type CP, CO
Loops Enabled Loops A and B, Loop A
T1 Line Encode B8ZS, AMI
Line Build-Out 1) 0 to 133 feet – 0
Framing D4, Extended Super Frame, Unframed
1
Refer to Chapter 3,
switchpack location and configuration options.
2
Refer to
UnFramed Operation
Customizing HotWire 7924 Nest Card Termination Units
1
Default in Bold
2) 133 to 266 feet
3) 266 to 399 feet
4) 399 to 533 feet
5) 533 to 655 feet
, for information on
for unframed operation considerations.
Nest Card Configuration
Jumper Settings
P12 (1, 2) Not used
(2, 3) Switchpack enabled
Default in [Bold]
2
A-4
7920-A2-GB20-10August 1997
Page 33
HotWire Model 7925 Worksheets
Overview
The following worksheets illustrate HotWire 7925-B1 configuration settings based
on the types of connection. There are two connection combinations for HotWire
7925 nest card termination units:
G.703-compatible units on both ends
V.35-compatible unit on the CP end, G.703-compatible unit on the CO end
B
G.703-to-G.703 Configuration
Multiplexer
G.703
G.703 Unit
Customer Premises
Cross-campus
4-wire facility
Multiplexer
G.703
G.703 Unit
Central Site
97-15292
7920-A2-GB20-10
August 1997
B-1
Page 34
HotWire Model 7925 Worksheets
To connect two G.703-compatible units, configure the units as follows (factory
defaults are in bold):
Configuration
Option
Card Type CP CO
Loops Enabled Dual (Loops A and B) or
E1 Line Encode HDB3 or AMI Must be same as CP side
Framing Framed or Unframed Framed or Unframed (does not
Line Build-Out
1
Refer to
build-out.
1
Switchpack Definitions
G.703-to-V.35 Configuration
Router
Customer Premises
V.35
V.35 Unit
G.703-Compatible Unit
(Customer Premises)
Single (Loop A)
75 ohm or 120 ohm 75 ohm or 120 ohm (does not
in Chapter 4 for more information on changing line
Telco 2- or 4-wire
facilities to
customer premises
G.703-Compatible Unit
(Central Site)
Must be same as CP side
need to be the same as the CP
side)
need to be the same as the CP
side)
Nest
Cards
7900 Nest
Central Site
Mgmt
Station
DCS
97-15406
To connect a V.35-compatible standalone unit on the CP side and a
G.703-compatible unit on the CO side, configure the units as follows (factory
defaults are in bold):
Configuration
Option
Card Type CP CO
Loops Enabled Dual (Loops A and B) or
Payload Rate 1 – 9 (64 – 2048 Kbps).
Transmit T iming Loop N/A
B-2
V.35-Compatible Unit
(Customer Premises)
Single (Loop A)
Option 9 (2048 kbps) is only
available if Loops A and B are
enabled.
G.703-Compatible Unit
(Central Site)
Must be same as CP side
N/A
7920-A2-GB20-10August 1997
Page 35
HotWire Model 7925 Worksheets
Configuration
Option
Framing N/A If the payload rate is 2048 Kbps,
E1 Line Encode N/A HDB3 or AMI
Line Build-Out1N/A 75 ohm or 120 ohm
1
Refer to
build-out.
V.35-Compatible Unit
(Customer Premises)
Switchpack Definitions
in Chapter 4 for more information on changing line
G.703-Compatible Unit
(Central Site)
use unframed.
If the payload rate is less than
2048 Kbps, use framed.
When the V.35 payload rate is set for less than 2048 Kbps, that payload rate
determines which E1 DS0’s are used, as follows:
V.35 Payload Rate
1 (64 Kbps) 1
2 (128 Kbps) 1, 3
3 (192 Kbps) 1, 3, 5
4 (256 Kbps) 1, 3, 5, 7
G.703 E1 DS0s Used
5 (384 Kbps) 1, 3, 5, 7, 9, 1 1
6 (512 Kbps) 1, 3, 5, 7, 9, 1 1, 13, 15
7 (768 Kbps) 1, 3, 5, 7, 9, 1 1, 13, 15, 16, 18, 20, 22
8 (1024 Kbps) 1, 3, 5, 7, 9, 1 1, 13, 15, 16, 18, 20, 22, 24, 26, 28, 30
7920-A2-GB20-10
August 1997
B-3
Page 36
HotWire Model 7925 Worksheets
HotWire 7925 Configuration Worksheet
Nest Card Configuration
Configuration Option Settings
HDSL Card Type CP, CO
Loops Enabled Loops A and B, Loop A
E1 Line Encode HDB3, AMI
Framing Framed, Unframed
Line Build Out 75 ohm, 120 ohm
1
Refer to Chapter 4,
switchpack location and configuration options.
Customizing HotWire 7925 Nest Card Termination Units
1
Nest Card Configuration
Jumpers Settings
J12 (1, 2) Not used
(2, 3) Switchpack enabled
Default in [Bold]
for information on
Default in [Bold]
B-4
7920-A2-GB20-10August 1997
Page 37
Glossary
AMI
BPV
Bridged tap
CD
CO
COM port
CP
CPE
CRC
CTS
CV
DCE
Alternate Mark Inversion coding format.
Bipolar Violation. A type of error detected by using a modified bipolar signaling method in
which a control code is inserted.
A section of cable that was used to provide phone service to a home or business that is
connected to a live copper wire but is not terminated.
Carrier Detect. A signal indicating that energy exists on the transmission circuit.
Associated with Pin 8 on an EIA-232 interface.
Central Site or Central Office.
Communications port. A computer’s serial communications port used to transmit to and
receive data from a DCE. The DCE connects directly to this port.
Customer Premises.
Customer Premises Equipment. Terminating equipment supplied by either the customer or
some other supplier that is connected to the telecommunications network (e.g., DSUs,
terminals, phones, routers, modems).
Cyclic Redundancy Check. A commonly used method of error detection.
Clear to Send. An EIA-lead standard for V.24 circuit CT 106; an output signal
(DCE-to-DTE).
Code Violation. This is equivalent to a BPV.
Data Communications Equipment. The equipment that provides the functions required to
establish, maintain, and end a connection. It also provides the signal conversion required
for communication between the DTE and the network.
DSR
DSX-1
DTE
DTR
E1
ETSI
factory defaults
FCC
FEBE
7920-A2-GB20-10
Data Set Ready . An EIA-lead standard for V.24 circuit CT 107; an output signal
(DCE-to-DTE).
Transmission standard at T1 speeds, 1544Mbits.
Data Terminal Equipment. The equipment, such as computers and printers, that provides
or creates data.
Data Terminal Ready. An EIA-lead standard for V.24 circuit CT 108; an input signal
(DTE-to-DCE).
A data signaling rate common outside the United States. A wideband interface operating at
2.048 Mbps defined by CCITT standards G.703 and G.704.
European Telecommunications Standards Institute. A European standards body
established in 1988 by a decision of the CEPT (Conference of European Postal and
Telecommunications Administrations).
A predetermined set of configuration options for general operation.
Federal Communications Commission. Board of Commissioners that regulates all U.S.
interstate, intrastate, and foreign electrical communication systems that originate from the
United States.
Far End Bit Error. Number of errors reported by the remote equipment.
August 1997
GL-1
Page 38
Glossary
HDB3
HDSL
HTU
HTU-C
HTU-M
HTU-R
HTU-S
LED
loopback
MTSO
OOF
reset
High Density Bipolar 3 coding format.
High-bit-rate Digital Subscriber Loop. Provides high bandwidth, bi-directional transmission
over copper wire for both T1 and E1 services.
Host Termination Unit. A generic reference to either an HTU-C or HTU-R module.
Host Termination Unit – Central. The module at the CO (central office) or central site end
of an HDSL connection. Also known as a Network Termination Unit (NTU).
Host Termination Unit – Maintenance. A carrier-mounted module used to perform
maintenance operations on one or more HTU-R and HTU-C modules.
Host Termination Unit – Remote. The module at the CP (customer premises) end of an
HDSL connection. Also known as a Line Termination Unit (LTU).
Host Termination Unit – SNMP. The SNMP-compatible version of the Maintenance
Processor.
Light Emitting Diode. A status indicator that responds to the presence of a certain
condition.
Used to test various portions of a data link in order to isolate an equipment or data line
problem. A diagnostic procedure that sends a test message back to its origination point.
Mobile Telephone Switching Office.
Out Of Frame. An error condition in which frame synchronization bits are in error. A
network-reported condition.
A reinitialization of the device that occurs at power-up or in response to a reset command.
RTS
RXD
SDSL
SNMP
STU
STU-C
STU-R
STU-S
T1
TXD
V.35
Request to Send. An EIA-lead standard for V.24 circuit CT 105; an input signal
(DTE-to-DCE).
Received Data. An EIA-lead standard for V.24 circuit CT 104; an output signal
(DCE-to-DTE).
Symmetrical Digital Subscriber Loop. Provides high bandwidth, bi-directional transmission
over copper wire for both T1 and E1 services using 2 wires.
Simple Network Management Protocol.
SDSL Termination Unit. A generic reference to either an STU-C or STU-R module.
SDSL Termination Unit – Central. The module at the CO (central office) or central site end
of an HDSL connection. Also known as a Network Termination Unit (NTU).
SDSL Termination Unit – Remote. The module at the CP (customer premises) end of an
HDSL connection. Also known as a Line Termination Unit (LTU).
SDSL Termination Unit – SNMP. The SNMP-compatible version of the Maintenance
Processor.
A data signaling rate common in the United States. A term for a digital carrier facility used
to transmit a DS1 formatted signal of 1.544 Mbps.
Transmit Data. An EIA-lead standard for V.24 circuit CT 103; an input signal
(DTE-to-DCE).
ITU-T standard for a high-speed, 34-pin, DCE/DTE interface.
GL-2
August 1997
7920-A2-GB20-10
Page 39
Index
C
Component location
Model 7925 Jumpers, 4-2
Model 7924 jumpers, 3-2
Model 7924 switchpack S1, 3-2
Model 7925 switchpack S1 , 4-2
Configuration option overview
G.703-to-G.703 , B-1
G.703-to-V.35 , B-2
Configuration Options Table, Model 7924 T1, A-4
Configuration Options, Model 7925 E1, B-1
Configuration options, 3-1, 4-1
Model 7924, A-1
Model 7924 T1 nest cards, 3-1
Model 7925 E1 nest cards, 4-1
Configuration Options Table, Model 7925 E1, B-4
Configuration overview, A-1, B-1
DSX-1 Nest to Standalone V.35, A-2
DSX-1 to DSX-1 Configuration, A-1
Configuration overviews, 1-2
7924 Configurations, 1-2
7925 Configurations, 1-4
Configuration Worksheet
Model 7924 T1, A-4
Model 7925 E1, B-4
D
Document purpose, iv
Document summary, iv
E
EMI Warnings, C
F
Features
7924 Features, 1-1
7925 Features, 1-2
G
glossary, GL-1–GL-4
I
Installation Procedures, Nest Filler Panels, 2-3
Installation procedures, Nest card termination units,
2-2
Intended audience, iv
Interfaces, 1-6
Internet address, A
J
Jumper positions, 3-4, 4-4
Model 7924 jumper positions, 3-4
Model 7925 jumper positions, 4-4
L
LEDs, 5-2
Line Build–out definitions, 3-3, 4-3
Model 7924 T1, 3-3
Model 7925 E1, 4-3
M
Monitoring HDSL Termination Units, 5-1
Front Panel LEDs, 5-2
What to Monitor, 5-1
7920-A2-GB20-10 August 1997
IN-1
Page 40
Index
N
Nest Filler Panels, 2-3
P
Package checklist, 2-1
Preinspection of equipment, 2-1
R
Related documents, v
S
Safety instructions, B
Sales information, A
Service information, A
Switchpack definitions, 3-3, 4-3
Model 7924 switchpack S1 definitions, 3-3
Model 7925 switchpack definitions, 4-3
Switchpack locations, 4-2
Model 7924 switchpack S1 , 3-2
Model 7925 switchpack S1, 4-2
U
Unframed Operation, Restrictions on DSX-1 to V.35
use, A-3
W
Warranty information, A
IN-2
August 1997
7920-A2-GB20-10
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