Paradyne HotWire 7914 User manual

HOTWIRE
MODEL 7914 STANDALONE
T1 SDSL TERMINATION UNIT
USER’S GUIDE
Document No. 7914-A2-GB20-00
February 1998

Printed on recycled paper
A 7914-A2-GB20-00
February 1998
Copyright 1998 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 local sales representative, service representative, or distributor directly for any help needed. For
additional information concerning warranty, sales, service, repair, installation, documentation, training, distributor
locations, or Paradyne worldwide office locations, 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
— Outside the U.S.A., call 1-727-530-2340

Important Regulatory Information
B
7914-A2-GB20-00 February 1998
Important Safety Instructions
1. Read and follow all warning notices and instructions marked on the product or included in the manual.
2. Do not allow anything to rest on the power cord and do not locate the product where persons will walk on the
power cord.
3. Do not attempt to service this product yourself, as opening or removing covers may expose you to dangerous
high voltage points or other risks. Refer all servicing to qualified service personnel.
4. General purpose cables are provided with this product. Special cables, which may be required by the regulatory
inspection authority for the installation site, are the responsibility of the customer.
5. When installed in the final configuration, the product must comply with the applicable Safety Standards and
regulatory requirements of the country in which it is installed. If necessary, consult with the appropriate regulatory
agencies and inspection authorities to ensure compliance.
6. A rare phenomenon can create a voltage potential between the earth grounds of two or more buildings. If
products installed in separate buildings are interconnected, the voltage potential may cause a hazardous
condition. Consult a qualified electrical consultant to determine whether or not this phenomenon exists and, if
necessary, implement corrective action prior to interconnecting the products.
7. In addition, if the equipment is to be used with telecommunications circuits, take the following precautions:
—Never install telephone wiring during a lightning storm.
—Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.
—Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the
network interface.
—Use caution when installing or modifying telephone lines.
—Avoid using a telephone (other than a cordless type) during an electrical storm. There may be a remote risk of
electric shock from lightning.
—Do not use the telephone to report a gas leak in the vicinity of the leak.
8. Input power to the 24 Vdc and –48 Vdc voltage configurations of this product must be provided by one of the
following: (1) a National Electrical Code (NEC)/Canadian Electrical Code (CEC) Class 2 circuit for use in North
America, or (2) a Safety Extra Low Voltage (SELV)/Limited Power Source (LPS) input certified for use in the
country of installation.

Important Regulatory Information
C 7914-A2-GB20-00
February 1998
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
7914-A2-GB20-00 February 1998
Contents
About This Guide
Document Purpose and Intended Audience v. . . . . . . . . . . . . . . . . . . . . . . . .
Document Summary v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product-Related Documents vi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1About Hotwire Model 7914 Termination Units
Hotwire 7914-A1 Models and Features 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Configurations 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User Interface Types 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2Installing the Unit
Overview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package Checklist for Hotwire Model 7914-A1 2-1. . . . . . . . . . . . . . . . . . . . . .
Planning for Your SDSL Application 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting to the Network 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting Power to the Unit 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3Using Terminal and Switchpack Modes
Choosing a Configuration Mode 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting to a System Terminal 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switching Between Terminal and Switchpack Modes 3-2. . . . . . . . . . . . . . . . .
4Customizing DSX-1-Compatible Units
Accessing Configuration Options 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Making Changes from the Terminal Interface 4-2. . . . . . . . . . . . . . . . . . . . . . .
Making Changes in Switchpack Mode 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring Framed or Unframed Operation
(DSX-1-to-DSX-1 Configuration) 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring a Starting Time Slot (DSX-1-to-V.35/V.11 Configuration) 4-5
Displaying Switchpack Definitions 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying Line Build-Out Definitions 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
ii 7914-A2-GB20-00
February 1998
5Customizing V.35/V.11-Compatible Units
Accessing Configuration Options 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Making Changes from the Terminal Interface 5-2. . . . . . . . . . . . . . . . . . . . . . .
Making Changes in Switchpack Mode 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selecting V.35 or V.11 Signaling 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying Switchpack Definitions 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6Monitoring the Unit
What to Monitor 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Board Status 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Statistics 6-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Unit Information 6-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel LEDs 6-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7Testing
Detecting a Problem 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Understanding Loopback Tests 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local Loopbacks 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Loopbacks 7-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting and Ending Loopbacks 7-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Resetting the Unit 7-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AWorksheets
Overview A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DSX-1-to-DSX-1 Configuration A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DSX-1-to-V.35/V.11 Configuration A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V.35/V.11-to-V.35/V.11 Configuration A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DSX-1-Compatible Units Configuration Worksheet A-4. . . . . . . . . . . . . . . . . .
V.35/V.11-Compatible Units Configuration Worksheet A-4. . . . . . . . . . . . . . . .

Contents
iii
7914-A2-GB20-00 February 1998
BCable Pin Assignments
Terminal Connection Cable B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SDSL Connection Cable Pin Assignments B-2. . . . . . . . . . . . . . . . . . . . . . . . . .
T1 Network Connection Cable Pin Assignments B-3. . . . . . . . . . . . . . . . . . . . .
V.35/V.11 Connection Cable Pin Assignments B-4. . . . . . . . . . . . . . . . . . . . . . .
DB25-to-V.35 Adapter Cable Pin Assignments B-5. . . . . . . . . . . . . . . . . . . . . .
CSwitchpack Definitions
DSX-1-Compatible Units C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V.35/V.11-Compatible Units C-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary
Index

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7914-A2-GB20-00 February 1998
About This Guide
Document Purpose and Intended Audience
This guide contains information needed to set up, configure, and operate Hotwire
Model 7914 T1 SDSL Termination Units. It is designed for central office
installation technicians and network engineers who have an understanding of the
deployment of Symmetric Digital Subscriber Loop (SDSL) transmission systems
in a telephone company or private network environment.
The Hotwire 7914 may be ordered either as a standalone unit (7914-A1-xxx) or
as a nest-mounted card (7914-B1-xxx) that fits in a Hotwire 7900 nest. This guide
describes the installation and maintenance procedures for the standalone
version, Model 7914-A1-xxx.
Document Summary
Section Description
Chapter 1 About Hotwire Model 7914 Termination Units . Describes the
features of each version of the Model 7914, and typical
configurations.
Chapter 2
Installing the Unit . Describes how to install the unit and
make connections.
Chapter 3
Using Terminal and Switchpack Modes. Provides
instructions for connecting a VT100-compatible terminal
user interface. Also describes how to make manual
configuration changes directly on the board hardware.
Chapter 4
Customizing DSX-1-Compatible Units . Provides instructions
for modifying configuration options by using the terminal
interface or DIP switches and jumpers on the board.
Chapter 5
Customizing V.35/V.11-Compatible Units . Provides
instructions for modifying configuration options by using the
terminal interface or DIP switches and jumpers on the
board.

About This Guide
vi 7914-A2-GB20-00
February 1998
Section Description
Chapter 6 Monitoring the Unit. Describes how to monitor unit status,
LEDs, and network statistics. Also describes how to monitor
the status of the unit on the opposite side of the SDSL
connection.
Chapter 7
Testing . Provides information about available loopback
tests.
Appendix A
Worksheets. Contains all the configuration options, default
settings, and possible settings to use for planning.
Appendix B
Cable Pin Assignments. Contains connector and interface
details.
Appendix C
Switchpack Definitions. Defines switchpack location and
usage.
Glossary Defines acronyms and terms used in this document.
Index Lists key terms, acronyms, concepts, and sections in
alphabetical order.
Product-Related Documents
Document Number Document Title
7900-A2-GB20 Hotwire Model 7900 Basic Maintenance Processor
User’s Guide
7900-A2-GN20 Hotwire Model 7900 Nest and Options Installation
Guide
7910-A2-GB20 Hotwire Models 7914 and 7915 T1 and E1 SDSL
Nest Card Termination Unit User’s Guide
7915-A2-GB20 Hotwire Model 7915 Standalone E1 SDSL
Termination Unit User’s Guide
7920-A2-GB20 Hotwire Models 7924 and 7925 T1 and E1 HDSL
Nest Card Termination Units User’s Guide
7924-A2-GB20 Hotwire Model 7924 Standalone T1 HDSL
Termination Unit User’s Guide
7925-A2-GB20 Hotwire Model 7925 Standalone E1 HDSL
Termination Unit User’s Guide
Contact your sales or service representative to order additional product
documentation.
Paradyne documents are also available on the World Wide Web at:
http://www.paradyne.com
Select
Service & Support → Technical Manuals

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7914-A2-GB20-00 February 1998
About Hotwire Model 7914
Termination Units 1
Hotwire 7914-A1 Models and Features
Products in the Hotwire 7914 family provide “last mile/last kilometer” transport of
T1-compatible circuits between customer facilities and central site equipment
over 2-wire copper lines. The units can be used over distances substantially
exceeding traditional T1 spans and Canadian Standards Association (CSA) loop
standards.
The Hotwire 7914 supports:
V.35/V.11 or DSX-1 interface
Fractional T1 using one twisted-copper pair
Tolerance of bridged taps
Local and remote alarm surveillance
Local and remote T1 and SDSL performance monitoring
The Hotwire 7914 may be ordered either as a standalone unit (7914-A1-xxx) or
as a nest-mounted card (7914-B1-xxx) that fits in a Hotwire 7900 nest. This guide
describes the installation and maintenance procedures for the standalone
version, Model 7914-A1-xxx.
To order additional product documentation, refer to
Product-Related Documents
on page vi.

Chapter:ChapName
1-2 7914-A2-GB20-00
February 1998
There are several versions of the Model 7914-A1, each supporting a different
interface (DSX-1 or V.35/V.11) and power supply (120 Vac or 220 Vac):
Model Number Features
7914-A1-201 1.544 Mb/s DSX-1 compatible.
Connection to 120 Vac power supply.
7914-A1-202 1.544 Mb/s V.35/V.11 compatible.
Connection to 120 Vac power supply.
7914-A1-301 1.544 Mb/s DSX-1 compatible.
Connection to 230 Vac power supply.
7914-A1-302 1.544 Mb/s V.35/V.11 compatible.
Connection to 230 Vac power supply.

About Hotwire Model 7914 Termination Units
1-3
7914-A2-GB20-00 February 1998
Typical Configurations
Hotwire Model 7914 standalone units can be used in campus applications where
long loop distances normally require the campus to contract with the local
telephone exchange carrier to deliver private line services across the campus.
Figure 1-1 shows two typical campus applications where remote PBXs or
multiplexers are interconnected across a campus using two Hotwire Model 7914
standalone units. In each pair, one unit is configured as a central site or central
office (CO) unit and the other is the remote or customer premises (CP) unit.
The Hotwire Model 7914 standalone unit is configured at the factory to operate at
the CP side of a T1 SDSL connection. (Conversely, Hotwire Model 7914 nest
cards are configured for CO operation.) The central site unit must be reconfigured
for CO operation in these configurations.
Customer Premises Central Site
Cross-campus
2-wire facility
PBX
DSX-1 Unit
DSX-1 PBX
DSX-1 Unit
DSX-1
97-15295a
Multiplexer
DSX-1 Unit
T1 Multiplexer
T1
Cross-campus
2-wire facility
Customer Premises Central Site
97-15718
DSX-1 Unit
Figure 1-1. Campus Network Applications

About Hotwire Model 7914 Termination Units
1-4 7914-A2-GB20-00
February 1998
Hotwire Model 7914 standalone units are also ideal for delivering T1 services
from a central site to the customer premises over long loop distances without
repeaters.
Figure 1-2 shows a central-site application with a Hotwire 7900 Nest containing
Hotwire Model 7914 nest cards. The nest cards at the central site each terminate
a single SDSL subscriber line. Each line is then converted to a DSX-1 interface
for connection to other central office 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-wire
facilities to
customer premises
Customer Premises
Central Site
97-15294a
Figure 1-2. T1 Extension to Customer Premises

About Hotwire Model 7914 Termination Units
1-5
7914-A2-GB20-00 February 1998
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 7914 products provide an alternative to standard repeatered T1
services. Figure 1-3 depicts a typical cellular network access application.
Switch
Mgmt
Station
7900 Nest
Nest
Cards
Telco 2-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)
97-15297a
Figure 1-3. Cellular Network Access
User Interface Types
There are three types of user interfaces to the standalone units:
VT100-compatible terminal interface (see Chapter 3)
Manual setting of switches and jumpers (see Chapter 3)
Front Panel LED status indicators (see Chapter 6)

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Installing the Unit 2
Overview
This chapter describes the procedure for installing a single standalone
termination unit using a 120 Vac or 230 Vac power supply (Model 7914-A1-20x or
7914-A1-30x).
Package Checklist for Hotwire Model 7914-A1
Verify that your package contains the following:
Hotwire Model 7914-A1 Termination Unit
10′VT100 terminal cable
14′CAT5 twisted-pair network cable
Power cord with power transformer
Warranty card
User’s Guide

Installing the Unit
2-2 7914-A2-GB20-00
February 1998
Planning for Your SDSL Application
A pair of Hotwire 7914 Termination Units operates on a standard twisted-pair
phone line. Observe the following restrictions for a successful installation:
Be sure the line consists of twisted pair. Any flat cable has a major negative
effect on loop length that can be supported.
Use Category 5 cable for the user connections.
Plan the phone line to be dedicated to SDSL. The same phone line used for
the 7914 Termination Unit pair cannot also be used at the same time to carry
other voice or data services. This is because the SDSL frequency spectrum
overlaps with the voice band (including voice, fax and analog modems), as
well as the higher spectrums of digital services (including ADSL, HDSL or
ISDN).
Measure or estimate the length of the phone line you plan to use. Hotwire
7914 Termination Units support connections as distant as 18,000 feet (over
three miles) on noise-free 24 AWG wire.
The actual loop length that can be supported will vary, depending on:
— The loop cable gauge
— Noise introduced from neighboring phone lines in the same binder group
or cable (which can change over time)
— Noise introduced at either termination unit, such as interference from a
PC monitor if the phone line is too close by (which can change over time)
Although the line rate is 1.54 Mbps downstream and upstream
simultaneously, the actual throughput will vary depending on:
— Any interfering loop noise present in the cable
— Quality and wire gage of the connecting cable
Handle the termination unit with care and use it in the proper environment.
NOTE:
Keep the cover on the termination unit for performance and for safety
reasons.

Installing the Unit
2-3
7914-A2-GB20-00 February 1998
Connecting to the Network
Procedure
1. Connect one end of the supplied 14′twisted-pair network cable into the rear
panel DSL jack. Connect the other end to your SDSL network interface.
NOTE:
Do not use a flat VF network cable, as this may severely degrade the
performance of the termination unit. Use only twisted-pair network cable.
2.
V.35/V.11-compatible units only: Use either a DB25-to-V.35 adapter cable
(see
DB25-to-V.35 Adapter Cable Pin Assignments in Appendix B for pin
assignments) or a cable with DB25 connectors. Connect one end to the
V.35/V.11 socket on the rear panel. Connect the other end to your V.35/V.11
equipment.
DSL 48 VDC V.35 / V.11
97-15530
V.35/V.11-Compatible Hotwire 7914 – Rear Panel
3.
DSX-1-compatible units only: Connect a DSX-1 interface cable into the DS1
jack on the rear panel. Connect the other end to your DSX-1 equipment.
DSL DS1
48 VDC
97-15714
DSX-1-Compatible Hotwire 7914 – Rear Panel

Installing the Unit
2-4 7914-A2-GB20-00
February 1998
Connecting Power to the Unit
Plug the power transformer into the appropriate (115 or 230 Vac) power outlet.
Connect the power lead into the –48 Vdc jack on the rear panel.
To obtain information on the power supplies and power cord adapters available,
refer to
Warranty, Sales, and Service Information on page A at the beginning of
this User’s Guide.

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7914-A2-GB20-00 February 1998
Using Terminal and Switchpack
Modes 3
Choosing a Configuration Mode
You can make configuration changes either through the system terminal menus
(Terminal Mode) or by manually changing switches on the board (Switchpack
Mode). Terminal Mode is the default setting.
In Terminal Mode:
You change configuration parameters by selecting menu options that appear
on a VT100-compatible terminal attached to the front panel of the termination
unit.
The standalone unit is configured at the factory for CP (customer premises)
operation.
In Switchpack Mode:
You change configuration parameters by moving switches on the board.
You can still display information about the unit from the terminal and run
loopback tests.
Any changes you made in Terminal Mode are lost when you change to
Switchpack Mode.
Connecting to a System Terminal
An optional system maintenance terminal can be attached to your Model 7914
Termination Unit through the modular jack on the front panel. You can have
terminals attached to both endpoints (CO and CP).
The system terminal must be a VT100-compatible terminal or a PC running
terminal emulation software.
Connect the 9-pin end of the terminal cable into a COM port on your PC. Plug the
other end into the modular jack on the front panel. If your PC requires a 25-pin
connector to the COM port, see Appendix B,
Cable Pin Assignments , for the
correct cable pinouts.

Using Terminal and Switchpack Modes
3-2 7914-A2-GB20-00
February 1998
Make sure the parameters on your terminal or PC are set to:
H9600 baud
H8 bit
Hno parity
H1 stop bit
Hno flow control
Press Return at your terminal keyboard to activate the Main Menu for the
attached unit. The system runs diagnostic tests as it comes up. After a few
seconds, the Main Menu screen appears on your terminal.
Menus are described in Chapters 4 and 5for the DSX-1 and V.35/V.11 units,
respectively.
Switching Between Terminal and Switchpack Modes
The following procedure is used to change the operating mode of the unit to
either Terminal Mode (the default setting) or Switchpack Mode. Refer to
Chapter 4 (for DSX-1-compatible units) or Chapter 5 (for V.35/V.11-compatible
units) for information on changing configuration options using either of these
modes.
"Procedure
Use electrostatic discharge (ESD) protection when handling the circuit board. To
change the mode:
1. Power down the unit and expose the circuit board by loosening the two
screws on the back panel of the unit and sliding off the cover.
2. See Appendix C,
Switchpack Definitions , for switchpack locations on your
unit’s board.
3. Locate switchpack S4 by its label on the circuit card.
4. Place the mode switch in the correct position for the desired mode.
For DSX-1-compatible units:
— Switchpack Mode is configured by setting switches 3–7 for Starting Time
Slot. See Table C-1 in Appendix C.
— Terminal Mode is configured by placing switches 3–7 in the ON position.
For V.35/V.11-compatible units:
— Switchpack Mode is configured by placing switch 8 in the ON position.
— Terminal Mode is configured by placing switch 8 in the Off position.
5.
If you are enabling Switchpack Mode: You must set the switchpacks and
jumpers to your desired configuration. Refer to Appendix C,
Switchpack
Definitions
.
6. Power up the board to reset and enable the new configuration.