PairGain PG-Flex User manual

PG-Flex 24 Channel
Subscriber Carrier System
Provisioning Manual
PairGain Technologies, Inc.
Engineering Plant Series Technical Manual
Section 363-125-100-01
Revision History of this manual
Revision 01—March 18, 1998
A) Initial Release

ii
PG-Flex 24 Channel Subscriber Carrier System Provisioning Manual
Section Number 363-125-100-01
Revision 01
March 1998
Copyright © 1998. PairGain Technologies, Inc. All rights reserved.
This document contains proprietary information which is protected by copyright. No part of this document may be
reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording,
or by any information storage and retrieval system, or translated into another language, without prior written consent
of PairGain Technologies, Inc., Tustin, California, USA.
The information in this publication is believed to be accurate in all respects. However, PairGain Technologies cannot
assume responsibility for any consequences resulting from the use thereof. The information contained hereinis subject
to change. Revision to this publication or new additions to it may be issued to incorporate such changes.
PairGain is a registered trademark, and PG-Flex is a trademark of PairGain Technologies, Inc.
Other product names mentioned in this manual are used for identification purposes only and may be trademarks and/
or registered trademarks of their respective companies.

iii
FCC Notice
This equipment has been tested and found to comply with the limits for a Class B 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 this instruction manual, may cause harmful interference to
radio communication.
However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by turning the equipment off and on,
the user is encouraged to try to correct the interference by one or more of the following measures:
1Reorient or relocate the receiving antenna.
2Increase the separation between the equipment and receiver.
3Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
4Consult the dealer or an experienced radio/TV technician for help.

Using This Manual
iv
Using This Manual
This manual was written to assist field service engineers and technicians in provisioning a 24 channel PG-Flex
subscriber carrier system. It contains descriptions of the PG-Flex equipment, terminal management access, and the
required settings to provision a complete PG-Flex 24 channel system. The document is divided into the following
sections:
•PG-Flex System Overview contains a general description of the PG-Flex architecture, and briefly describes
the central office and remote terminal equipment.
•Installing PG-Flex System Hardware provides procedures for installation and powering-up a PG-Flex
system.
•Terminal Management explains how to interface with your PG-Flex system through the craft maintenance
port, defines screen menus and display structure, and provides navigation instructions through these menus.
•Provisioning Your System provides procedures on how to configure your PG-Flex system, and defines the
available settings for each option.
•Performance Monitoring provides procedures for viewing PG-Flex system status information.
•Troubleshooting provides procedures to troubleshoot a PG-Flex system using standard test equipment, using
test access methods, and by using the indications displayed on the front panel LEDs of line units, channel
units, alarm units, and FPI cards.
•Screen Menus and Definitions provides a sequential list of all available screen menus on a PG-Flex system.
Conventions and Icons
Two message conventions with icons appear in the text:
A Note informs you of special circumstances.
Cautions indicate the possibility of damage to equipment or the possibility of personal injury.

v
FCC Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Using This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
Conventions and Icons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
PG-FLEX SYSTEM OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Central Office Terminal Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
COT Shelves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Alarm Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FAU-728 List 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FAU-728 List 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PGTC Interface Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
COT Line Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
COT Channel Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
COT POTS Channel Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ISDN Channel Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Remote Terminal Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
RT Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
RT Line Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
RT Channel Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Subscriber Drop Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Channel Unit Signatures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Metallic Bypass Pair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Craft Port Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Major Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Minor Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Information Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
CONTENTS

Contents
vi
INSTALLING PG-FLEX SYSTEM HARDWARE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
PG-Flex System Compatibility Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
PG-Flex Product List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Line Unit Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Guidelines to Preprovisioning HDSL Lines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Installing the Remote Terminal Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Mount the Remote Terminal Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Connect the Chassis Ground Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Connect the HDSL Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Connect the Bypass Pair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Connect the Subscriber Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Protector Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Install the Line Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Install the Channel Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Installing the Central Office Terminal Equipment. . . . . . . . . . . . . . . . . . . . . . . . . 37
Mount the COT Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Wire Power to the Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Connect the Frame Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Connect the CO Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Connect the HDSL Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Connect Bypass Pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Individual Bypass Pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Shared Bypass Pairs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Connect the Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Connect the Composite Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Connect the Subscriber Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Auxiliary Power Pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Power-Up the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Verify System Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Install the Alarm Unit or the PGTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Install the Line Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Install the Channel Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
TERMINAL MANAGEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Management Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Craft Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Cable Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Connecting to a Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Connecting to a Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Craft Port Menu Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Main Menu Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Navigating Through the Menus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Selecting an Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
PROVISIONING YOUR SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Before You Begin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Line Unit Front Panel Indications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
FPI-729 List 1 or FAU-728 List 2 Front Panel Indications . . . . . . . . . . . . . . 64
Channel Unit Front Panel Indications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Contents
vii
Logging On to Your PG-Flex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Logging On to the Alarm Unit or PGTC Interface. . . . . . . . . . . . . . . . . . . . . 66
FPI Log On Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
FPI Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Accessing the Main Menu through the FPI Unit. . . . . . . . . . . . . . . . . . . 68
Accessing the FPI Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . 70
Logging On to a Line Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Log On Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
System Time Set Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Accessing the Main Menu through a Line Unit . . . . . . . . . . . . . . . . . . . 74
Setting System Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
System Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
View Time Slot Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
POTS Ground/Loop Start Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
ISDN Channel Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Changing ISDN Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Configure Alarm on ISDN PM Threshold . . . . . . . . . . . . . . . . . . . . . . . 86
PERFORMANCE MONITORING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
System Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Channel Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
HDSL Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Alarm History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
ISDN Performance Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Troubleshooting Using Front Panel LED Indications . . . . . . . . . . . . . . . . . . . . . . 98
Line Unit Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
FPI-729 or FAU-728 List 2 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . 99
Channel Unit Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
PG-Flex Metallic Test Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Manual Subscriber Line Metallic Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Test Desk Activation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Automatic Line Metallic Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Subscriber Drop Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Bridging and Breaking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Craft Port Metallic Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Maintenance Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Metallic Access Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Metallic Access Sample Menus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
ISDN Loopback Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Troubleshooting Using Standard Test Equipment. . . . . . . . . . . . . . . . . . . . . . . . . 110
HDSL Transmission Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
TECHNICAL SUPPORT AND WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Certification and Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Contents
viii
SCREEN MENUS AND DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Logon Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Connect to FPI System Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
FPI Logon Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
System Time Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
FPI-729 Main Menu and Configuration Screens . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
Main Menu Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
Status Menu Screens. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-10
System Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-10
Channel Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12
COT Channel Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12
RT Channel Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12
HDSL Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-13
24-Hour HDSL Performance History . . . . . . . . . . . . . . . . . . . . . . . . . . . A-13
7-Day Performance History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-14
Alarm History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-14
COT Shelf Alarm History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-15
RT Shelf Alarm History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-15
Span Alarm History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-16
ISDN Performance Monitoring Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-17
Select New Card and Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-18
PM Error Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-18
PM Threshold/Alert Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-20
Setup Menu Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-22
System Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-22
Time Slots Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-27
Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-28
POTS Loop/Ground Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-29
ISDN Channel Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-30
Maintenance Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-31
Metallic Access Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-32
ISDN Loopback Menus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-34
Inventory Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-35
Logout Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-35
ACRONYMS AND GLOSSARY
INDEX

1
This section contains a general overview of the PG-Flex 24 channel universal subscriber carrier
system, and provides descriptions of the Central Office (CO) and Remote Terminal (RT)
equipment.
Introduction
PG-Flex is a small-capacity, universal subscriber carrier system supporting up to 24 channels on
two pair ofexisting copper wires. A PG-Flex system is comprised of one lineunit and one (ormore)
channel units at both the Central Office and the Remote Terminals (Figure 1). The Central Office
Terminal (COT) line unit takes the CO battery and converts it to the voltages necessary to operate
the COT line units and channel units, and supplies power to the RT equipment.
The CO-side of a PG-Flex system mounts into either a 19- or a 23-inch COT shelf. The 19-inch
shelf supports up to two systems, while the 23-inch shelf supports up to four systems. An alarm
unit or Pair Gain Test Controller (PGTC) interface unit (common to all systems installed in a shelf)
provides an interface for maintenance alarm relays and metallic access to the remote subscriber
lines. The plain old telephone service (POTS) channel units use a pulse code modulation (PCM)
encoding scheme that allows high speed modem and group 3 facsimile operation on all channels.
Each channel unit can provide four (4) or eight (8) channels depending on the service offered.
Services offered are:
• POTS Loop Start
• POTS Ground Start
• Integrated Services Digital Network (ISDN)
The RT-side of a PG-Flex system mounts into an FRE-765 RT enclosure. The RT enclosure
supports one system, which includes one line unit and up to three channels units. The channel units
must be the same type of card as the channel units installed at the CO.
PG-FLEX SYSTEM OVERVIEW

PG-Flex System Overview
2
Figure 1. Typical PG-Flex Configuration (23" Shelf shown)