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)

Central Office Terminal Equipment
3
Central Office Terminal Equipment
The COT comprises the following equipment:
•COTShelf
• Alarm Unit or FPI Interface
• Line Unit(s)
• Channel Unit(s)
COT Shelves
COT shelves provide standard mounting configurations for PG-Flex systems and support both
19-inch and 23-inch equipment frames. The 19-inch shelf may be equipped with a maximum of
two systems and the 23-inch shelf may be equipped with a maximum of four systems. Line,
channel, and alarm units are installed from thefront of the shelf; interconnections are located on the
passive backplane at the rear of the shelf. A Plexiglass™ cover is installed on the rear of the shelf
to prevent damage to wire-wrap terminations and to protect the technician from high voltages.
Figure 2. Two 24 Channel PG-Flex Systems (19” Shelf)
The 19-inch COT Shelf (Figure 2), when fully populated, accommodates two complete systems.
Each system requires one COT line unit and up to three channel units.

PG-Flex System Overview
4
The 23-inch COT Shelf (Figure 3), when fully populated, accommodates four complete systems.
Each system requires one COT line unit and up to three channel units.
Figure 3. Four 24-Channel PG-Flex Systems (23” Shelf)
Alarm Unit
PG-Flex supports two types of Alarm units, the FAU-728 List 1 and the FAU-728 List 2. Both
Alarm units provide PG-Flex Shelf interface to the CO Audio and Visual Alarms, and provide at
least one test jack for line breakout functions (Looking-In, Looking-Out, Bridging). Neither Alarm
Card supports the Pair Gain Test Controller (PGTC) test function.
FAU-728 List 1
The FAU-728 List 1 interfaces with the Central Office alarms and provides unique test jacks for up
to four installed COT line units within a single PG-Flex COT shelf. The FAU-728 does not operate
unless powered by a COT line unit in any slot position in an FCS-718 (19” shelf) or in the System
1 or 2 positions in an FCS-719 (23” shelf).
FAU-728 List 2
The FAU-728 List 2 Alarm Unit provides one test jack which is shared by all the COT line units
installed in the PG-Flex shelf. Additionally, the Alarm Unit serves as a Craft Port Multiplexer for
all COT line units installed in the shelf. Upon detection of the List 2 Alarm Unit, the Craft
Maintenance Port connectors on the individual line units are disabled and communications are
routed to the backplane.
The FAU-728 List 2 Alarm Unit can be used in situations where digital data service cards (ISDN,
DDS) are used in the shelf but the PGTC function is not required. The List 2 Alarm Card provides
an 8 kHz sync signal to all COT line units installed in the COT Shelf. The 8 kHz sync signal is
derived from the Central Office supplied Composite Clock. The Alarm Unit reports a loss of the
Composite Clock signal. The severity of the failure is user definable (Major, Minor, disabled).
The FAU-728 List 2 is powered from the CO battery independently of the COT line units.

Central Office Terminal Equipment
5
PGTC Interface Unit
The FPI-729 List 1 Pair Gain Test Controller (PGTC) Interface Unit provides a common interface
between the PGTC and the PG-Flex system under test. The FPI provides the translation facilities
necessary to satisfy the discrete line communications to and from the PGTC, and the serial message
protocol to and from the COT line unit in test.
The FPI-729 also provides Craft Port Multiplexer capabilities; a multiplexed test jack for subscriber
line access; and handles the CO supplied Composite Clock for digital service cards.
The PGTC Interface Card is used in situations where digital data service cards (ISDN, DDS) are
used in the shelf and the PGTC function is required. The FPI-729 is used to provide an 8 kHz sync
signal to all COT line units installed in the COT Shelf. The 8 kHz sync signal is derived from the
Central Office supplied Composite Clock. The Alarm Unit reports a loss of the Composite Clock
signal. The severity of the failure is user definable (Major, Minor, Disabled).
COT Line Unit
A PG-Flex system is comprised of one line unit and one or more channel units at both the CO and
remote terminals. The COT line unit takes the CO battery and converts it to the voltages necessary
to operate the COT line unit and channel units, as well as for powering the remote terminal. The
line unit also includes the high-bit digital-rate subscriber line (HDSL) transceivers and common
control.

PG-Flex System Overview
6
COT Channel Units
PG-Flex channel units interface between subscriber services and the system’s internal PCM bus.
All channel units include status indicators for each circuit supported on the channel unit and may
be “hot plugged” without affecting system operation. A number of different channel units are
available based on the service required.
COT POTS Channel Units
COT POTS channel units provide the analog-to-digital interface between PG-Flex’s internal PCM
bus and the CO switch. LEDs display the status of each subscriber channel, and indicate channel
unit fault conditions. Channel units provide a metallic connection to the metallic bypass pair for
subscriber drop testing. On hook transmission is provided to support CLASS services.
The 8-channel POTS units for PG-Flex support eight analog interfaces at both the CO and RT
locations. Three channel units are required for a 24-channel system. The channel units provide the
following features:
• converts analog signals to 64 kbps (µ-Law or A-Law) PCM digital format
• detects ringing voltage
• detects 12 kHz and 16 kHz meter tones
• detects forward disconnect
• detects subscriber drop metallic access signal
• provides loop closure
• provides on-hook transmission to support CLASS services
A status LED associated with each line indicates whether the line is off-hook, idle, ringing, or being
tested. A common fault LED indicates that a general fault has been detected on the unit and that
the unit should be replaced.
Metallic access relays provide a metallic connection to “look-in,” “look-out,” and “bridge” on each
line circuit. Metallic access points appear on the COT Alarm or PGTC Interface Units. Metallic
access connections to a specific line circuit are made through the maintenance terminal or by the
CO switch applying the appropriate voltages on the subscriber line.

Central Office Terminal Equipment
7
ISDN Channel Units
ISDN is a networking standard that provides end-to-end, simultaneous handling of digitized voice
and data traffic on the same link. The ISDN Basic Rate Interface (BRI) channel unit provides an
interface to North American Integrated Services Digital Network (ISDN) basic access services
(see Figure 4). Each ISDN channel unit for PG-Flex supports four “U” interfaces with
provisionable sealing current and performance monitoring on each channel. Line termination (LT)
in the CO occurs at the ISDN switch. The channel unit provides the line unit termination at the RT,
and the subscriber site has the Network Termination (NT1).
Figure 4. Typical ISDN Arrangement
The main features of the ISDN channel unit are:
• four ISDN U-interfaces
• mechanized loop testing (MLT) compatible and metallic test access
• dc resistive test signatures
• mp/pp eoc slave mode in 3DS0 format
• segmented path performance monitoring
• interim path performance monitoring
• software provisioning
• loopbacks
• Pair Gain Test Controller (PGTC) compatible
• sealing current (RT)

PG-Flex System Overview
8
Remote Terminal Equipment
The RT Enclosure (Figure 5) is comprised of the following equipment:
• RT enclosure
• line unit
• channel unit(s)
RT Enclosure
One RT Enclosure is required for each PG-Flex system, and provides mounting for one common
line unit and up to three (3) channel units, supporting up to 24 channels. The enclosures provide
termination points for subscriber circuits, power, and metallic bypass pair. AMP Quiet Front™ or
RayChem terminations, with internal gas tube protectors, are provided on the backplane for High
bit-rate Digital Subscriber Line (HDSL) and Bypass connections. Optionally, add AMP Quiet
Front termination or RayChem terminations for auxiliary power pairs when used with a PG-Flex
doubler. The enclosure can be pole or wall mounted and is environmentally sealed for outside plant
installation.
Figure 5. Remote Terminal Enclosure

Remote Terminal Equipment
9
RT Line Units
The RT line unit includes the HDSL transceivers and converts the line power from the COT into
the voltages required by the remote terminal electronics. Regardless of the number of channels
being transported by PG-Flex, two copper pairs are required between the CO and the RT to support
the HDSL transport and provide power to the RT. As shown in Figure 6, both pairs are used for
simplexing the power between the COT and RT.
Figure 6. Connections Between the COT and RT
For subscriber drop testing, a third copper pair is required between the COT and RT to provide a
metallic path between the selected subscriber pair and the Central Office test equipment.

PG-Flex System Overview
10
RT Channel Units
Channel units provide the interface between subscriber services (POTS, ISDN) and the PG-Flex
system’s internal pulse code modulation (PCM) bus. The RT channel units must be installed in the
same relative slot positions as the channel units on the CO-end of a PG-Flex system.
The RT channel units provide the following features:
• 64 kbps A-Law PCM encoding
• applies ringing voltage
• generates forward disconnect
• generates metering tones (12 kHz, 16 kHz)
• detects an off-hook or ring-tip condition
• connects a subscriber loop to a metallic test pair
• protects against secondary surges
A status LED is associated with each line to indicate whether the line is off-hook, idle, ringing, or
being tested. A common fault LED indicates a general fault has been detected on the unit
(Figure 7). Metallic test access connections to a specific line circuit are made through the Craft port
or by the CO switch applying the appropriate voltages on the subscriber line.
Figure 7. RT Channel Unit Block Diagram

Subscriber Drop Testing
11
Subscriber Drop Testing
The ability to test a subscriber drop is an essential element in the overall outside plant maintenance
strategy. PG-Flex supports this function using a dc (metallic) test pair between the remote terminal
and central office terminal. Using standard metallic access techniques and equipment, the
telephone company can access a specific subscriber drop and have a metallic test path back to the
central office equipment.
For subscriber drop testing from the CO, PG-Flex is able to select and connect any subscriber drop
to the metallic bypass test pair at the RT. PG-Flex extends this connection back to the COT where
it switches onto the metallic access bus or to the corresponding subscriber line on the COT channel
card.
The most common method of subscriber drop metallic access is through the central office channel
unit of the selected subscriber. Momentary placement and removal of +116 Vdc on the tip
conductor is recognized by PG-Flex as a metallic access request. PG-Flex provides the metallic test
path (Figure 8) while the termination of the test pair is dependent on whether a Pair Gain Test
Controller (PGTC) Interface Unit is installed. When -116 Vdc is momentarily placed then removed
from the tip conductor, PG-Flex restores all connections back to normal.
Metallic access can also be activated through anASCII terminal connected to the Craft maintenance
port located on the front of the COT line unit.
Channel Unit Signatures
To ensure that the test system can identify a carrier channel unit, all channel units incorporate the
appropriate three-terminal dc signature resistances (Table 1) and conform to Bellcore’s
TR-NWT-000057.
Table 1. COT Channel Unit Signatures
Termination FLC-701, List 2
FLC-703, List 3 All Other COT POTS Channel Units
Tip-Ring (open) 475 kΩ, 1%
Tip-Ground 162 kΩ, 1% 332 kΩ, 1%
Ring-Ground 162 kΩ, 1% (open)

PG-Flex System Overview
12
Metallic Bypass Pair
As shown in Figure 8, a third pair may be used between the remote terminal and central office
terminal to provide a metallic test path from the central office test equipment to a selected
subscriber drop.
Figure 8. Metallic Test Access Through COT Channel Unit
When testing subscriber drops through the metallic bypasspair, the length and quality of the bypass
pair must be taken into consideration when analyzing the measurement results.
Only one subscriber circuit in a PG-Flex shelf can be accessed at a time when an FPI-729 List 1 or
an FAU-728 List 2 is installed.
If an FAU-728 List 1 is installed, one subscriber circuit in each PG-Flex system can be accessed
simultaneously.