Paradyne HotWire 7924 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
MODELS 7924 AND 7925
T1 AND E1 HDSL NEST CARD
TERMINATION UNITS
USER’S GUIDE
Document No. 7920-A2-GB20-10
August 1997

Printed on recycled paper
A 7920-A2-GB20-10
August 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
B
7920-A2-GB20-10 August 1997
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.

Important Regulatory Information
C 7920-A2-GB20-10
August 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.

i
7920-A2-GB20-10 August 1997
Contents
About This Guide
Document Purpose and Intended Audience iii. . . . . . . . . . . . . . . . . . . . . . . . .
Document Summary iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product-Related Documents iv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1About 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2Installing 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3Customizing 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4Customizing 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
ii 7920-A2-GB20-10
August 1997
5Monitoring Nest Card Termination Units
What to Monitor 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel LEDs 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AHotWire 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. . . . . . . . . . . . . . . . . . . . . . . . . . . .
BHotWire 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

iii
7920-A2-GB20-10 August 1997
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 About HotWire Models 7924 and 7925 Nest Card
Termination Units
. Describes the features of HotWire 7924
and 7925 termination units and provides typical
configurations.
Chapter 2
Installing HotWire Nest Card Termination Units . Describes
the procedures for installing the HotWire Model 7900 nest
card termination units and nest filler panels.
Chapter 3
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.
Chapter 4
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.
Chapter 5
Monitoring Nest Card Termination Units. Describes how to
monitor LEDs, unit, and network status.

About This Guide
iv 7920-A2-GB20-10
August 1997
Section Description
Appendix A HotWire Model 7924 Worksheets. Contains all the
configuration options, default settings, and possible settings
to use for planning.
Appendix B
HotWire Model 7925 Worksheets. Contains all the
configuration options, default settings, and possible settings
to use for planning.
Glossary Defines the acronyms and terms used in this document.
Index Lists the key terms, acronyms, and concepts, 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-GK10 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 Warranty, Sales, and Service
Information
on page A at the beginning of this User’s Guide.

1-1
7920-A2-GB20-10 August 1997
About HotWire Models 7924 and
7925 Nest Card Termination Units 1
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).
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

Chapter:ChapName
1-2 7920-A2-GB20-10
August 1997
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
Product-Related Documents in About This
Guide
for information on user manuals for the standalone units.
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 Unit
Router
DSX-1
DCS
Mgmt
Station
7900 Nest
Nest
Cards
V.35 Unit
V.35
Multiplexer
DSX-1 Unit
DSX-1
Telco 2- or 4-wire
facilities to
customer premises
Customer Premises
Central Site
97-15294
Figure 1-1. T1 Extension to Customer Premises

About HotWire Models 7924 and 7925 Nest Card Termination Units
1-3
7920-A2-GB20-10 August 1997
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.
Switch
Mgmt
Station
7900 Nest
Nest
Cards
Telco 2- or 4-wire
facilities
between Cell Sites
and MTSO
Customer Premises
Central Site
DSX-1
DSX-1 Unit
DSX-1
DSX-1 Unit
DSX-1
Cell Site
Cell Site
Mobile Telephone
Switching Office (MTSO)
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.
Customer Premises Central Site
Cross-campus
2- or 4-wire
facility
PBX
DSX-1 Unit
DSX-1
PBX
DSX-1 Unit
DSX-1
97-15295
Multiplexer
DSX-1 Unit
DSX-1
Multiplexer
DSX-1 Unit
DSX-1
Cross-campus
2- or 4-wire
facility
Customer Premises Central Site
97-15296
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.

About HotWire Models 7924 and 7925 Nest Card Termination Units
1-4 7920-A2-GB20-10
August 1997
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 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 1-4. 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.
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 1-5. Cellular Network Access

About HotWire Models 7924 and 7925 Nest Card Termination Units
1-5
7920-A2-GB20-10 August 1997
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.
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 1-6. 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.

About HotWire Models 7924 and 7925 Nest Card Termination Units
1-6 7920-A2-GB20-10
August 1997
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.

2-1
7920-A2-GB20-10 August 1997
Installing HotWire Nest Card
Termination Units 2
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
Inspect the Shipping Container
Inspect the shipping container for signs of damage. Specific signs to check for
are:
HMajor tears or puncture holes on the sides of the container
HSplits in the seams
HCorner 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.

Installing HotWire Nest Card Termination Units
2-2 7920-A2-GB20-10
August 1997
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
Product-Related Documents in About This Guide .
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
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.
NETWORK
LOS/AIS/BER
LOCAL
REMOTE
REMOTE
LOOP BK
SYSTEM
PWR
FAIL
HDSL
LOS / BER
LOOP 1
LOOP 2
OK
FAIL
SELECT
NEXT
ALARMS
MAJOR
MINOR
ABNORM
ACO
ACTIVE
NETWORK
LOS/AIS/BER
LOCAL
REMOTE
REMOTE
LOOP BK
SYSTEM
PWR
FAIL
HDSL
LOS / BER
LOOP 1
LOOP 2
NETWORK
LOS/AIS/BER
LOCAL
REMOTE
REMOTE
LOOP BK
SYSTEM
PWR
FAIL
HDSL
LOS / BER
LOOP 1
LOOP 2
NETWORK
LOS/AIS/BER
LOCAL
REMOTE
REMOTE
LOOP BK
SYSTEM
PWR
FAIL
HDSL
LOS / BER
LOOP 1
LOOP 2
97-15440
Maintenance Processor Option
(HTU-M) Slots 1 & 2
NETWORK
LOS/AIS/BER
LOCAL
REMOTE
REMOTE
LOOP BK
SYSTEM
PWR
FAIL
HDSL
LOS / BER
LOOP 1
LOOP 2

97-15537
Installing HotWire Nest Card Termination Units
2-3
7920-A2-GB20-10 August 1997
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.

3-1
7920-A2-GB20-10 August 1997
Customizing HotWire 7924 Nest
Card Termination Units 3
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.
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.

Switchpack S1
97-15419-01
P12
678
ON
12345
P6
P11
P2
810P031207
xxx
xxxxxx
Last Two Digits Indicate
Firmware Revision Number
P13
U5
P1
P3
Front
Panel
LEDs
Customizing HotWire 7924 Nest Card Termination Units
3-2 7920-A2-GB20-10
August 1997
Switchpack and Jumper Locations
Use Figure 3-1 to locate HotWire 7924 nest card jumpers and switchpack S1.
Position Setting
Default in Bold
1OFF = CP
ON = CO
2OFF = AMI line encoding
ON = B8ZS line encoding
3OFF = Loops A and B
ON = Loop A
4, 5, 6 000 = 0 to 133 feet
100 = 133 to 266 feet
010 = 266 to 399 feet
110 = 399 to 533 feet
001 = 533 to 655 feet
7, 8 00 = Unframed *
01 = D4
11 = ESF
*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 V.35-compatible standalone unit,
refer
Unframed Operation in
Appendix A.
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.