7920-A2-GB20

7920-A2-GB20
HOTWIRE
MODELS 7924 AND 7925
T1 AND E1 HDSL NEST CARD
TERMINATION UNITS
USER’S GUIDE
Document No. 7920-A2-GB20-20
November 1997
TM
* SPECIAL NOTICE *
HDSL Connection Considerations:
There are several steps that you must take to maximize
loop reach of your HDSL product:
Use only CAT5 Twisted-Pair Network Connection
cables (as supplied with Paradyne Hotwire HDSL
products) for HDSL Termination Unit connection and
interface patch cabling. Untwisted analog cables, of
any length anywhere in the loop, substantially
contribute to crosstalk and reduced loop reach.
Ensure the main bundle of the loop is standard
twisted-pair voice cable (i.e., CAT3).
Choose non-adjacent wire pairs within the main
bundle whenever possible.
Use only non-conditioned loops (no load coils, echo
suppression, etc.).
Eliminate any non-twisted cable from the loop.
Always keep TIP and RING in the same twistedcable pair.
* SPECIAL NOTICE (continued) *
Near-End Crosstalk (NEXT)
Any wire pair within a cable carrying a signal radiates energy. Other wire
pairs act as antennas and pick up this radiated energy. By twisting wire
pairs the radiated energy is reduced, thereby reducing the effect of
crosstalk.
It is critical that only twisted-pair cabling be used for all connections within
the HDSL loop. Using non-twisted pair cable anywhere within the loop
significantly increases the amount of NEXT, decreasing the Signal-to-Noise
Ratio (SNR) and loop reach.
Self-Generated Near-End Crosstalk (Self NEXT)
In Figure 1, the transmit signal of Loop B (CP TX Loop B) is coupled onto
the receive path of Loop A (CP RX Loop A). As a result, the SNR and reach
of Loop A is reduced.
An SNR of approximately 30 dB is required for reliable, error-free operation
per individual loop. A reduction of 6 to 9 dB SNR can occur when several
HDSL links are added to the same 25-pair bundle. For example, if Loop A
by itself has an SNR of 39 dB, adding multiple additional loops to the same
bundle might reduce the SNR of Loop A to 33 dB.
NOTE: It is recommended that when multiple HDSL loops are added to the
same 25-pair bundle, the SNR of each individual loop remain at or above
30 dB.
CP TX Loop A
CP TX Loop A
Loop A
Loop A
CP RX Loop A
Customer
Premises
Unit
CP RX Loop A
Central
Site
Unit
NEXT
CP TX Loop B
CP TX Loop B
Loop B
Loop B
CP RX Loop B
CP RX Loop B
97-15580-01
Figure 1. Self-Generated Near-End Cross Talk (Self NEXT)
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 727-530-2340
Printed on recycled paper
A
November 1997
7920-A2-GB20-20
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-GB20-20
November 1997
B
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.
CE Mark
When the product is marked with the CE mark, this mark has been affixed to demonstrate full compliance with the
following European Directives:
Directive 73/23/EEC – Council Directive of 19 February 1973 on the harmonisation of the laws of the Member
States relating to electrical equipment designed for use within certain voltage limits, as amended by Directive
93/68/EEC.
Directive 89/336/EEC – Council Directive of 3 May 1989 on the approximation of the laws of the Member States
relating to Electro-Magnetic Compatibility (EMC), as amended by Directive 93/68/EEC.
C
November 1997
7920-A2-GB20-20
Contents
About This Guide
Document Purpose and Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . iii
Document Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Product-Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
1
About Hotwire Models 7924 and 7925 Termination Units
Hotwire 7924 and 7925 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Hotwire Model 7924 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Hotwire Model 7925 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Hotwire Model 7924 Typical Configurations . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Hotwire Model 7925 Typical Configurations . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Nest Card Termination Unit User Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
2
Installing Hotwire Nest Card Termination Units
Package Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Inspecting 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-GB20-20
November 1997
i
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
November 1997
7920-A2-GB20-20
About This Guide
Document Purpose and Intended Audience
This guide contains information needed to set up, configure, and operate Hotwire
Models 7924-B1 (T1) and 7925-B1 (E1) HDSL Nest Card Termination Units. It is
expected that readers of this document are central office technicians or network
engineers who have an understanding of the deployment of digital subscriber line
systems in a telephone company or private network environment.
Hotwire 7924 and 7925 Termination Units can be ordered either as standalone
units (7924-A1-xxx/7925-A1-xxx) or as nest-mounted circuit cards
(7924-B1-xxx/7925-B1-xxx) that fit in the Hotwire 7900 Nest. This guide describes
the configuration, installation, and maintenance procedures for Hotwire
Models 7924-B1 and 7925-B1 T1 and E1 HDSL nest-mounted cards.
Document Summary
7920-A2-GB20-20
Section
Description
Chapter 1
About Hotwire Models 7924 and 7925 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 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 DIP switches and jumpers located on the board.
Chapter 5
Monitoring Nest Card Termination Units. Describes how to
monitor unit and network status using the front panel LEDs.
November 1997
iii
About This Guide
Section
Description
Appendix A
Hotwire Model 7924 Worksheets. Contains all the
configuration options, default settings, and possible settings.
Appendix B
Hotwire Model 7925 Worksheets. Contains all the
configuration options, default settings, and possible settings.
Glossary
Defines the acronyms and terms used in this document.
Index
Lists 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-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 User’s Guide
7925-A2-GB20
Hotwire Model 7925 Standalone E1 HSDL
Termination Unit User’s Guide
To order additional product documentation, refer to Warranty, Sales, and Service
Information on page A at the beginning of this User’s Guide.
iv
November 1997
7920-A2-GB20-20
About Hotwire Models 7924 and
7925 Termination Units
1
Hotwire 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 and nest-mounted
termination units.
Hotwire Model 7924 Features
Hotwire Model 7924 features include:
7920-A2-GB20-20
DSX-1 and V.35 (standalone units only) 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
November 1997
1-1
About Hotwire Models 7924 and 7925 Termination Units
Hotwire Model 7925 Features
Hotwire Model 7925 features include:
G.703 and V.35 (standalone units only) interface
Meet 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 simplifying 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-B1/7925-B1) that fit in the Hotwire 7900 Nest. This guide describes the
installation and maintenance procedures for the nest-card termination units,
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
DSX-1 Unit
Router
Telco 2- or 4-wire
facilities to
customer premises
V.35
Nest
Cards
Management
Station
V.35 Unit
DCS
7900 Nest
Multiplexer
DSX-1
Central Site
DSX-1 Unit
Customer Premises
97-15294-01
Figure 1-1. T1 Extension to Customer Premises
1-2
November 1997
7920-A2-GB20-20
About Hotwire Models 7924 and 7925 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
Mobile Telephone
Switching Office (MTSO)
Telco 2- or 4-wire
facilities
between Cell Sites
and MTSO
DSX-1
Nest
Cards
DSX-1 Unit
Management
Station
Cell Site
7900 Nest
DSX-1
Switch
DSX
-1
Central Site
DSX-1 Unit
Customer Premises
97-15297-01
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.
Cross-campus
2- or 4-wire
facility
PBX
DSX-1
DSX-1 Unit
DSX-1 Unit
Central Site
Customer Premises
Cross-campus
2- or 4-wire
facility
Multiplexer
DSX-1
PBX
DSX-1
DSX-1 Unit
Customer Premises
DSX-1
97-15295
Multiplexer
DSX-1 Unit
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.
7920-A2-GB20-20
November 1997
1-3
About Hotwire Models 7924 and 7925 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. Each nest card termination unit
terminates 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
Router
Nest
Cards
Telco 2- or 4-wire
facilities to
customer premises
V.35
Management
Station
V.35 Unit
DCS
7900 Nest
Multiplexer
G.703
Central Site
G.703 Unit
97-15290
Customer Premises
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
Telco 2- or 4-wire
facilities between
Cell Sites
and MTSO
Mobile Telephone
Switching Office (MTSO)
Nest
Cards
Cell Site
7900 Nest
G.703
Management
Station
G.70
3
Switch
Central Site
G.703 Unit
Customer Premises
97-15293
Figure 1-5. Cellular Network Access
1-4
November 1997
7920-A2-GB20-20
About Hotwire Models 7924 and 7925 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
2- or 4-wire
facility
Multiplexer
G.703
G.703 Unit
G.703
Multiplexer
G.703 Unit
Customer Premises
Central Site
97-15292a
Cross-campus
2- or 4-wire
facility
LAN
Router
V.35
V.35 Unit
Customer Premises
LAN
V.35
Router
V.35 Unit
Central Site
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-GB20-20
November 1997
1-5
About Hotwire Models 7924 and 7925 Termination Units
Nest Card Termination Unit User Interfaces
There are two types of user interfaces to the nest card termination units:
Switches and jumpers (refer to Chapter 3, Customizing Hotwire 7924 Nest
Card Termination Units, and Chapter 4, Customizing Hotwire 7925 Nest Card
Termination Units)
Front Panel LED status indicators (refer to Chapter 5, Monitoring Nest Card
Termination Units)
If you have a Hotwire Model 7900 Basic Maintenance Processor (MTU-M), you
can also monitor nest card termination units and network status using:
1-6
The MTU-M front panel LEDs
A VT100-compatible system terminal connected to the MTU-M front panel or
nest rear panel.
November 1997
7920-A2-GB20-20
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
Inspecting 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-GB20-20
November 1997
2-1
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 (MTU-M) 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 the MTU-M maintenance processor option is installed in Slot 1
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 front panel.
Maintenance Processor Option
(MTU-M) Slot 1
MTU-M
POWER
FAIL
NMS LINK
MODEMS
ALARMS
MAJOR
MINOR
ABNML
ACO
NETWORK
LOS/AIS/BER
NETWORK
LOS/AIS/BER
NETWORK
LOS/AIS/BER
NETWORK
LOS/AIS/BER
NETWORK
LOS/AIS/BER
LOCAL
REMOTE
REMOTE
LOOP BK
LOCAL
REMOTE
REMOTE
LOOP BK
LOCAL
REMOTE
REMOTE
LOOP BK
LOCAL
REMOTE
REMOTE
LOOP BK
LOCAL
REMOTE
REMOTE
LOOP BK
SYSTEM
SYSTEM
SYSTEM
SYSTEM
SYSTEM
PWR
FAIL
PWR
FAIL
PWR
FAIL
PWR
FAIL
PWR
FAIL
NETWORK
LOS/AIS/BER
LOCAL
REMOTE
REMOTE
LOOP BK
ACTIVE
RESET
C
O
N
S
O
L
E
HDSL
LOS / BER
HDSL
LOS / BER
HDSL
LOS / BER
HDSL
LOS / BER
HDSL
LOS / BER
LOOP 1
LOOP 2
LOOP 1
LOOP 2
LOOP 1
LOOP 2
LOOP 1
LOOP 2
LOOP 1
LOOP 2
SYSTEM
PWR
FAIL
HDSL
LOS / BER
LOOP 1
LOOP 2
97-15707
2-2
November 1997
7920-A2-GB20-20
Installing Hotwire Nest Card Termination Units
Installing Nest Filler Panels
There are four nest filler panels provided with each Hotwire 7900 Nest. Each nest
filler panel covers 1, 2, 4, or 8 slots on the nest. Use any combination of nest filler
panels to cover slots that do not contain nest cards.
! WARNING:
Front Panel Fillers are required for EMI safety purposes. Install nest
filler panels to cover all nest card slots that do not contain nest card
termination units.
" 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. Attach a filler panel with the retaining screws provided.
3. Repeat until all empty nest card slots are covered.
97-15774
7920-A2-GB20-20
November 1997
2-3
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 Card Termination Units.
Chapter 4 provides configuration options for G.703-compatible Hotwire 7925 E1
Nest Card Termination Units.
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.
" 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 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.
NOTE:
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-GB20-20
November 1997
3-1
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.
U5
P1
P2
Last Two Digits Indicate
Firmware Revision Number
Switchpack S1
810P031207
xxx
xxxxxx
ON
1
P12
P3
P11
P13
P6
Front
Panel
LEDs
97-15419-01
2
3
4
5 6
7
8
Position
Setting
1
OFF = CP
ON = CO
2
OFF = AMI line encoding
ON = B8ZS line encoding
3
OFF = 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
Default in Bold
* 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
to a V.35-compatible standalone unit,
refer to Unframed Operation in
Appendix A.
Figure 3-1. Hotwire 7924 Nest Card Switchpack and Jumper Locations
3-2
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.
November 1997
7920-A2-GB20-20
Customizing Hotwire 7924 Nest Card Termination Units
Switchpack Definitions
Change configuration options by moving switchpack S1 DIP switches on the nest
card.
Switchpack S1 Definitions
Position # . . .
Allows you to . . .
1
Control whether the board is an HTU-C (CO) or an HTU-R (CP).
Default in Bold
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 HDSL 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
110 = 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:
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.
* 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 to Unframed Operation in
Appendix A, Hotwire Model 7924 Worksheets.
7920-A2-GB20-20
November 1997
3-3
Customizing Hotwire 7924 Nest Card Termination Units
Jumper Positions
The following table provides the correct default jumper positions for your nest
card.
3-4
Jumper
Position
P1
No jumper
P2
1–2
P3
2–3
P6
No jumper
P11
1–2
P12
1–2
P13
1–2
November 1997
7920-A2-GB20-20
Customizing Hotwire 7925 Nest
Card Termination Units
4
Changing Your Configuration Options
This chapter provides instructions on how to change or verify configuration
options for G.703-compatible Hotwire 7925 E1 Nest Card Termination Units.
Chapter 3 provides configuration options for DSX-1-compatible Hotwire 7924 T1
Nest Card Termination Units.
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.
" 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.
NOTE:
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-GB20-20
November 1997
4-1
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.
Switchpack S1
P1
P2
ON
1
P12
P3
P11
2
3
4
5 6
7
8
P4
P5
P13
P6
Front
Panel
LEDs
Position
Setting
1
OFF = CP
ON = CO
2
OFF = AMI line encoding
ON = HDB3 line encoding
3
OFF = Loops A and B
ON = Loop A
4
Unused
5
OFF = 75 ohm line
build-out
ON = 120 ohm line
build-out
6
Unused
7
Unused
8
OFF = Unframed
ON = Framed
Default in Bold
97-15527
Figure 4-1. Hotwire 7925 Nest Card Switchpack Locations and Jumper Positions
4-2
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.
November 1997
7920-A2-GB20-20
Customizing Hotwire 7925 Nest Card Termination Units
Switchpack Definitions
Change configuration options by moving switchpack S1 DIP switches on the nest
card hardware.
Switchpack S1 Definitions
Position # . . . Allows you to . . .
1
Default in Bold
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
7920-A2-GB20-20
November 1997
4-3
Customizing Hotwire 7925 Nest Card Termination Units
Jumper Positions
The following table provides the correct default jumper positions for your nest
card.
4-4
Jumper
Position
P1
No jumper
P2
1–2
P3
2–3
P4
1–2
P5
1–2
P6
No jumper
P11
1–2
P12
1–2
P13
1–2
November 1997
7920-A2-GB20-20
Monitoring Nest Card
Termination Units
5
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 using a Hotwire 7900 Basic Maintenance Processor (MTU-M).
The MTU-M maintenance processor:
Monitors the status of up to 63 nest card termination units
Stores the performance history of individual circuits and network status
Monitors and displays individual circuit and loop status on the maintenance
processor front panel
Displays individual circuit and loop status on the VT100-compatible terminal
Interfaces with and reports circuit status to your Network Management
System using Simple Network Management Protocol (SNMP)
For further information on the maintenance processor, refer to the Hotwire
Model 7900 Basic Maintenance Processor User’s Guide.
7920-A2-GB20-20
November 1997
5-1
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.
LED .
NETWORK
LOS/AIS/BER
LOCAL
REMOTE
LOOP BK
SYSTEM
PWR
FAIL
..
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.
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.)
HDSL
LOS / BER
LOOP A
LOOP B
97-15441
5-2
November 1997
7920-A2-GB20-20
Hotwire Model 7924 Worksheets
A
Overview
The following worksheets illustrate Hotwire 7924-B1 configuration settings based
on the types of connection. There are two connection combinations for Hotwire
Model 7924 Nest Card Termination Units:
DSX-1-compatible units at both ends
V.35-compatible unit at the customer premises (CP), DSX-1-compatible unit
at the central site (CO)
DSX-1 to DSX-1 Configuration
Mobile Telephone
Switching Office (MTSO)
Cell Site
DSX-1
Telco 2- or 4-wire
facilities between
Cell Sites
and MTSO
Nest
Cards
Management
Station
DSX-1 Unit
7900 Nest
Customer Premises
DSX
-1
Switch
Central Site
97-15405
7920-A2-GB20-20
November 1997
A-1
Hotwire Model 7924 Worksheets
To connect two DSX-1-compatible units, configure the units as follows (factory
defaults are in bold):
Configuration
Option
DSX-1-Compatible Unit
(Customer Premises)
DSX-1-Compatible Unit
(Central Site)
Card Type
CP
CO
Loops Enabled
Dual (Loops A and B) or
Single (Loop A)
Must be same as CP side
T1 Line Encode
B8ZS or AMI
Must be same as CP side
Framing
D4, Extended Superframe,
or Unframed
Must be same as CP side
Line Build-Out
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
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
DSX-1 Nest-to-Standalone V.35 Configuration
Router
Telco 2- or 4-wire
facilities to
customer premises
V.35
Nest
Cards
Management
Station
V.35 Unit
DCS
7900 Nest
Customer Premises
Central Site
97-15406-01
To connect a V.35-compatible standalone unit at 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
V.35-Compatible Unit
(Customer Premises)
DSX-1-Compatible Unit
(Central Site)
Card Type
CP
CO
Loops Enabled
Dual (Loops A and B) or
Single (Loop A)
Must be same as CP side
Payload Rate
1 – 9 (64 – 1536 kbps).
N/A
Options 8 and 9 are only
available if loops A and B
are enabled.
A-2
November 1997
7920-A2-GB20-20
Hotwire Model 7924 Worksheets
Configuration
Option
V.35-Compatible Unit
(Customer Premises)
DSX-1-Compatible Unit
(Central Site)
Framing1
N/A
If the payload rate is 1544 kbps,
use unframed.
If the payload rate is less than 1544 kbps,
use D4 or ESF.
T1 Line Encode
N/A
B8ZS or AMI
Line Build-Out
N/A
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
1
Refer to Unframed Operation for unframed operation considerations.
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
DSX-1 T1 DS0s Used
1 (64 kbps)
1
2 (128 kbps)
1, 2
3 (192 kbps)
1–3
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
Unframed Operation
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.
2. The V.35-compatible unit must have an HDSL firmware revision number of
three (03) or higher.
To display the HDSL FW (firmware) revision number, select the Board
Configuration option (3) from the Main Menu (a system terminal is required).
7920-A2-GB20-20
November 1997
A-3
Hotwire Model 7924 Worksheets
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 Configuration1
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
2) 133 to 266 feet
3) 266 to 399 feet
4) 399 to 533 feet
5) 533 to 655 feet
Framing
D4, Extended Super Frame, Unframed2
Default in Bold
1
Refer to Chapter 3, Customizing Hotwire 7924 Nest Card Termination Units, for
information on switchpack location and configuration options.
2 Refer to Unframed Operation page A-3 for unframed operation considerations.
Nest Card Configuration
A-4
Jumper
Settings
P12
(1, 2) Not used
(2, 3) Switchpack enabled
November 1997
Default in [Bold]
7920-A2-GB20-20
Hotwire Model 7925 Worksheets
B
Overview
The following worksheets illustrate Hotwire 7925-B1 configuration settings based
on the types of connection. There are two connection combinations for Hotwire
Model 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
G.703-to-G.703 Configuration
Cross-campus
2- or 4-wire
facility
Multiplexer
G.703
G.703 Unit
Customer Premises
Nest
Cards
Multiplexer
G.703
7900 Nest
Central Site
97-15292
7920-A2-GB20-20
November 1997
B-1
Hotwire Model 7925 Worksheets
To connect two G.703-compatible units, configure the units as follows (factory
defaults are in bold):
Configuration
Option
G.703-Compatible Unit
(Customer Premises)
G.703-Compatible Unit
(Central Site)
Card Type
CP
CO
Loops Enabled
Dual (Loops A and B) or
Single (Loop A)
Must be same as CP side
E1 Line Encode
HDB3 or AMI
Must be same as CP side
Framing
Framed or Unframed
Must be same as CP side
75 ohm or 120 ohm
75 ohm or 120 ohm (does not
need to be the same as the CP
side)
Line
1
Build-Out1
Refer to Switchpack Definitions in Chapter 4 for more information on changing line
build-out.
G.703-to-V.35 Configuration
Router
Telco 2- or 4-wire
facilities to
customer premises
V.35
Nest
Cards
V.35 Unit
Customer Premises
Management
Station
DCS
7900 Nest
Central Site
97-15406-01
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
V.35-Compatible Unit
(Customer Premises)
G.703-Compatible Unit
(Central Site)
Card Type
CP
CO
Loops Enabled
Dual (Loops A and B) or
Single (Loop A)
Must be same as CP side
Payload Rate
1 – 9 (64 – 2048 kbps).
N/A
Option 9 (2048 kbps) is only
available if Loops A and B are
enabled.
Transmit Timing
B-2
Loop
November 1997
N/A
7920-A2-GB20-20
Hotwire Model 7925 Worksheets
Configuration
Option
V.35-Compatible Unit
(Customer Premises)
G.703-Compatible Unit
(Central Site)
Framing
N/A
If the payload rate is 2048 kbps,
use unframed.
If the payload rate is less than
2048 kbps, use framed.
E1 Line Encode
N/A
HDB3 or AMI
Line Build-Out1
N/A
75 ohm or 120 ohm
1
Refer to Switchpack Definitions in Chapter 4 for more information on changing line
build-out.
When the V.35 payload rate is set for less than 2048 kbps, that payload rate
determines which E1 DS0s are used, as follows:
7920-A2-GB20-20
V.35 Payload Rate
G.703 E1 DS0s Used
1 (64 kbps)
1
2 (128 kbps)
1, 3
3 (192 kbps)
1, 3, 5
4 (256 kbps)
1, 3, 5, 7
5 (384 kbps)
1, 3, 5, 7, 9, 11
6 (512 kbps)
1, 3, 5, 7, 9, 11, 13, 15
7 (768 kbps)
1, 3, 5, 7, 9, 11, 13, 15, 16, 18, 20, 22
8 (1024 kbps)
1, 3, 5, 7, 9, 11, 13, 15, 16, 18, 20, 22, 24, 26, 28, 30
November 1997
B-3
Hotwire Model 7925 Worksheets
Hotwire 7925 Configuration Worksheet
Nest Card Configuration1
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
Default in [Bold]
Refer to Chapter 4, Customizing Hotwire 7925 Nest Card Termination Units for
information on switchpack location and configuration options.
Nest Card Configuration
B-4
Jumpers
Settings
J12
(1, 2) Not used
(2, 3) Switchpack enabled
November 1997
Default in [Bold]
7920-A2-GB20-20
Glossary
AMI
Alternate Mark Inversion coding format.
BPV
Bipolar Violation. A type of error detected by using a modified bipolar signaling method in
which a control code is inserted.
Bridged tap
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.
CD
Carrier Detect. A signal indicating that energy exists on the transmission circuit.
Associated with Pin 8 on an EIA-232 interface.
CO
Central Site or Central Office.
COM port
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.
CP
Customer Premises.
CPE
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).
CRC
Cyclic Redundancy Check. A commonly used method of error detection.
CTS
Clear to Send. An EIA-lead standard for V.24 circuit CT 106; an output signal
(DCE-to-DTE).
CV
Code Violation. This is equivalent to a BPV.
DCE
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
Data Set Ready. An EIA-lead standard for V.24 circuit CT 107; an output signal
(DCE-to-DTE).
DSX-1
Transmission standard at T1 speeds, 1544Mbits.
DTE
Data Terminal Equipment. The equipment, such as computers and printers, that provides
or creates data.
DTR
Data Terminal Ready. An EIA-lead standard for V.24 circuit CT 108; an input signal
(DTE-to-DCE).
E1
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.
ETSI
European Telecommunications Standards Institute. A European standards body
established in 1988 by a decision of the CEPT (Conference of European Postal and
Telecommunications Administrations).
factory defaults
A predetermined set of configuration options for general operation.
FCC
Federal Communications Commission. Board of Commissioners that regulates all U.S.
interstate, intrastate, and foreign electrical communication systems that originate from the
United States.
FEBE
Far End Bit Error. Number of errors reported by the remote equipment.
7920-A2-GB20-20
November 1997
GL-1
Glossary
HDB3
High Density Bipolar 3 coding format.
HDSL
High-bit-rate Digital Subscriber Loop. Provides high bandwidth, bi-directional transmission
over copper wire for both T1 and E1 services.
HTU
Host Termination Unit. A generic reference to either an HTU-C or HTU-R module.
HTU-C
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).
HTU-R
Host Termination Unit – Remote. The module at the CP (customer premises) end of an
HDSL connection. Also known as a Line Termination Unit (LTU).
HTU-S
Host Termination Unit – SNMP. The SNMP-compatible version of the Maintenance
Processor.
LED
Light Emitting Diode. A status indicator that responds to the presence of a certain
condition.
loopback
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.
MTSO
Mobile Telephone Switching Office.
MTU-M
Multiple Termination Unit – Maintenance. A carrier-mounted module used to perform
maintenance operations on one or more HTU/STU-R and HTU/STU-C modules.
OOF
Out Of Frame. An error condition in which frame synchronization bits are in error. A
network-reported condition.
reset
A reinitialization of the device that occurs at power-up or in response to a reset command.
RTS
Request to Send. An EIA-lead standard for V.24 circuit CT 105; an input signal
(DTE-to-DCE).
RXD
Received Data. An EIA-lead standard for V.24 circuit CT 104; an output signal
(DCE-to-DTE).
SDSL
Symmetrical Digital Subscriber Loop. Provides high bandwidth, bi-directional transmission
over copper wire for both T1 and E1 services using 2 wires.
SNMP
Simple Network Management Protocol.
STU
SDSL Termination Unit. A generic reference to either an STU-C or STU-R module.
STU-C
SDSL Termination Unit – Central. The module at the central office or central site end of an
HDSL connection. Also known as a Network Termination Unit (NTU).
STU-R
SDSL Termination Unit – Remote. The module at the customer premises end of an HDSL
connection. Also known as a Line Termination Unit (LTU).
T1
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.
TXD
Transmit Data. An EIA-lead standard for V.24 circuit CT 103; an input signal
(DTE-to-DCE).
V.35
ITU-T standard for a high-speed, 34-pin, DCE/DTE interface.
GL-2
November 1997
7920-A2-GB20-20
Index
C
E
Component location
Model 7924 jumpers, 3-2
Model 7925 jumpers, 4-2
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 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
EMI Warnings, C
D
Document purpose, iii
Document summary, iii
7920-A2-GB20-20
F
Features
7924 Features, 1-1
7925 Features, 1-2
I
Installation procedures
Nest card termination units, 2-2
Nest filler panels, 2-3
Intended audience, iii
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
November 1997
IN-1
Index
M
S
Monitoring HDSL Termination Units, 5-1
Front Panel LEDs, 5-2
What to Monitor, 5-1
P
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
Package checklist, 2-1
Preinspection of equipment, 2-1
U
R
Unframed Operation, Restrictions on DSX-1 to V.35
use, A-3
N
Nest filler panels, 2-3
Related documents, iv
W
Warranty information, A
IN-2
November 1997
7920-A2-GB20-20
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