Symmetricom TimeHub 5500 User manual

TimeHub 5500
User’s Guide
Revision M – January 2009
Part Number 097-55501-01

Symmetricom, Inc.
2300 Orchard Parkway
San Jose, CA 95131-1017
U.S.A.
http://www.symmetricom.com
Copyright © 1999–2009 Symmetricom, Inc.
All rights reserved. Printed in U.S.A.
All product names, service marks, trademarks, and registered trademarks
used in this document are the property of their respective owners.

Table of Contents
097-55501-01 Revision M – January 2009 TimeHub 5500 User’s Guide 3
How to Use This Guide
Purpose of This Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Who Should Read This Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Structure of This Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Conventions Used in This Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Warnings, Cautions, Recommendations, and Notes . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Related Documents and Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Where to Find Answers to Product and Document Questions. . . . . . . . . . . . . . . . . . . 20
What’s New In This Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Chapter 1 Description
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Physical Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Functional Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
DS1 and CC Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
NTP and 5 MHz Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Communication Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Input/Alarm Connector Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Clock Cards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Management Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Output Driver Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Output Connector Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Connection Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5 MHz Output Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
NTP Server Cards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Alarm Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Synchronization Status Messaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Input SSMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Automatic Reference Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Output SSMs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Passthrough Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Passthrough Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Firmware Versions and Passthrough Operation. . . . . . . . . . . . . . . . . . . . . . . . . 36
Master/Remote Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Remote Shelf Capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
SSMs in a Remote Shelf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Expansion Shelf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Output Driver Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Contents

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4TimeHub 5500 User’s Guide 097-55501-01 Revision M – January 2009
Expansion Controller Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Rear Panel of the Expansion Shelf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Expansion Output Connector Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Output Driver Cards and Output Connector Modules . . . . . . . . . . . . . . . . . . . . . 44
Redundancy Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Communicating With the Expansion Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
TimeScan THC Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Chapter 2 Engineering Ordering Information
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Wire-wrap Panels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Card Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Clock Cards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Management Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
DS1/CC Driver Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
5 MHz Output Driver Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Input/Alarm Connector Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Output Connector Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
5 MHz Output Connector Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Expansion Controller Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
NTP Server Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
NTP Card Clock Quality and Holdover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
NTP Server or Client. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Authentication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
NTP Traffic Load Limit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
NTP Output Connector Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Ordering and Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
User-Supplied Tools and Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Chapter 3 Installing the TimeHub
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Site Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Preliminary Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Installation Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Electromagnetic Interference (EMI) Considerations . . . . . . . . . . . . . . . . . . . . . . 94
Ventilation Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Unpacking the TimeHub 5500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Rack Mounting the TimeHub 5500. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Mounting the Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Installing the Wire-wrap Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

097-55501-01 Revision M – January 2009 TimeHub 5500 User’s Guide 5
Table of Contents
Configuring the Shelf as a Master or Remote . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Making Ground and Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Grounding the Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Grounding the Wire-wrap Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Making Power Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Testing Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Installing the NTP Server Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Maximum Load Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Installing Modules into the Rear Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Installing Rear Panel Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Installing the Input/Alarm Connector Module . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Installing Output Connector Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Installing the NTP Output Connector Module . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Installing Blank Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Making Signal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Making Shelf–to–Panel Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Connecting Timing Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Making NTP Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Making Communication Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Connecting Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
GPS Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Installing the Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Installing Expansion Shelves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Installing the Shelf in the Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Making Ground and Power Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Setting the Expansion Shelf Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Installing Output Connector Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Making Expansion Shelf Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Removing Expansion Shelves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Chapter 4 Testing and Configuring the TimeHub
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Installing Cards into the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Installing the Management Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Installing the Clock Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Confirming the Master or Remote Shelf Setting . . . . . . . . . . . . . . . . . . . . . . . . 145
Installing Output Driver Cards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Installing Cards into the Expansion Shelf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Installing Expansion Controller Cards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Installing Output Driver Cards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Establishing a Connection to the TimeHub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Communicating by Serial Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Communicating by Ethernet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Provisioning Master Shelf Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Setting the Date and Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

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6TimeHub 5500 User’s Guide 097-55501-01 Revision M – January 2009
Setting the System ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Setting the Target ID. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Verifying the Hardware Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Provisioning Inputs on a Master Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Provisioning the NTP Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Provisioning the Bonding Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Provisioning for Client/Server Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Provisioning for MD5 Authentication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
Provisioning for Traffic Load Limit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
Testing an Expansion Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Provisioning Inputs on a Remote Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Testing the Clock Input Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Provisioning the Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Securing Cards in the Shelf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Configuring CC Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Phase Aligning CC Input and CC Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Setting the Delay on CC Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Testing the NTP Cards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
LED Indications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Verifying the Port A and Port B IP Addresses. . . . . . . . . . . . . . . . . . . . . . . . . . 190
Verifying the NTP Server Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
Verifying the Bonding Mode Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Verifying the Redundancy Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
Checking System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Enabling Security. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Managing the User List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
Setting the Configuration to Factory Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
Chapter 5 Maintaining the TimeHub 5500
Clearing Output Port Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
False Reporting of Output Port Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Clearing False Port Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Testing the Cards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Reference Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Removing a Clock Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Troubleshooting the TimeHub 5500. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Troubleshooting the Clock Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
Troubleshooting the Output Driver Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
Reading the Output Driver Firmware Version . . . . . . . . . . . . . . . . . . . . . . . . . . 223
Troubleshooting the Management Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
Troubleshooting the Expansion Controller Card . . . . . . . . . . . . . . . . . . . . . . . . 230
Troubleshooting the 5 MHz Output Driver Card . . . . . . . . . . . . . . . . . . . . . . . . 233
Troubleshooting the NTP Server Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
Replacing Cards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238

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Table of Contents
Replacing the Clock Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
Replacing the Output Driver Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
Replacing the Management Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
Replacing the Expansion Controller Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
Replacing the 5 MHz Output Driver Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
Replacing an Output Connector Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
Replacing Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
Replacing the Fuse in the Clock Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
Replacing the Fuse in the Management Card. . . . . . . . . . . . . . . . . . . . . . . . . . 245
Replacing the Fuse in the Output Driver Card . . . . . . . . . . . . . . . . . . . . . . . . . 246
Replacing the Fuse in the EC Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
Upgrading the Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248
Manually Downloading Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
Backing Up the New Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258
Repairing a Corrupt File System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259
Upgrading the TimeHub NTP Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
Returning the TimeHub for Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
Repacking the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
Equipment Return Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264
Contacting Symmetricom Global Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264
User Manual Updates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265
Chapter 6 Specifications
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
Local Communication Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
LAN Communication Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
Remote Communication Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
GPS Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
Expansion Link 1 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
Expansion Link 2 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269
DS1 Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269
PRS Reference Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270
Composite Clock Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270
DS1 Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270
Composite Clock Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271
5 MHz Output Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271
NTP Server Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272
Output Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272
Input Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Shelf Mechanical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Wire-wrap Panel Mechanical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
Shelf and Wire-wrap Panel Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
Factory Default Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
Management Card Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275

Table of Contents
8TimeHub 5500 User’s Guide 097-55501-01 Revision M – January 2009
Clock Card Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
Output Driver Card Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
User Changes to Factory Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
Appendix A Maintenance of Prior Master and Expansion
Shelves
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
Making Ground and Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
Grounding the Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
Grounding the Wire-wrap Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283
Making Power Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283
Testing Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284
Making Ground and Power Connections–Expansion Shelf . . . . . . . . . . . . . . . . . . . . 285
Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .287

List of Figures
097-55501-01 Revision M – October 2008 TimeHub 5500 User’s Guide 9
Figures
1-1 The TimeHub 5500. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1-2 TimeHub 5500 Shelf and Connection Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
1-3 General Block Diagram of the TimeHub 5500 System. . . . . . . . . . . . . . . . . . . . . . 25
1-4 Block Diagram for DS1 and CC Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
1-5 Block Diagram for DS1/CC, NTP, and 5 MHz Outputs. . . . . . . . . . . . . . . . . . . . . . 27
1-6 TimeHub 5500 Expansion Shelf – Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
2-1 Front and Rear of the High-Density Wire-wrap Adapter Panel . . . . . . . . . . . . . . . 48
2-2 Front Panel of the ST2-Rb Clock Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
2-3 Front Panel of the Management Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
2-4 Front Panel of the DS1/CC Driver Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
2-5 Block Diagram of the TimeHub 5 MHz Output Driver Card . . . . . . . . . . . . . . . . . . 59
2-6 Front Panel of the 5 MHz Output Driver card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
2-7 Front Panel of the Input/Alarm Connector Module. . . . . . . . . . . . . . . . . . . . . . . . . 62
2-8 Output Connector Modules for the Master/Remote Shelf: DS1 (left) and CC (right) .
64
2-9 Output Connector Modules for the Expansion Shelf: DS1 (left) and CC (right) . . . 65
2-10 TimeHub 5 MHz Connector Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
2-11 Front Panel of the Expansion Controller Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
2-12 Block Diagram of NTP Server Cards in the TimeHub Shelf. . . . . . . . . . . . . . . . . . 70
2-13 Front Panel of the NTP Server Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
2-14 Block Diagram of the TimeHub NTP System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
2-15 Sample NTPv4 Packet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
2-16 Single NTP Card, No Port Bonding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
2-17 Single NTP Card with Port Bonding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
2-18 Two NTP Server Cards, No Port Bonding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
2-19 Two NTP Server Cards with Port Bonding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
2-20 TimeHub NTP Output Connector Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
3-1 Mounting Options for the Shelf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
3-2 High-Density Wire-wrap Panel (Front and Rear) . . . . . . . . . . . . . . . . . . . . . . . . . . 97
3-3 Assembling the Rack Extenders for a 23-inch Shelf . . . . . . . . . . . . . . . . . . . . . . . 98
3-4 Sample Rack Installation of a Master Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
3-5 Sample Rack Installation of a Master and Expansion Shelf. . . . . . . . . . . . . . . . . 100
3-6 Master/Remote Rotary Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
3-7 Universal Ground Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
3-8 Connectors on the Rear Panel of the Master Shelf . . . . . . . . . . . . . . . . . . . . . . . 104
3-9 Wire-wrap Panel Ground Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
3-10 Power and Ground Connections on the Master Shelf . . . . . . . . . . . . . . . . . . . . . 106
3-11 Location of Output Connector Modules on the Rear Panel of the Master/Remote
Shelf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
3-12 Location of Output Connector Modules on the Rear Panel of the Expansion Shelf. .
112
3-13 Rear Panel Connectors on the Main Shelf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
3-14 Connecting Outputs to the High-Density Wire-wrap Panel . . . . . . . . . . . . . . . . . 116
3-15 Connecting Outputs to Existing Wire-wrap Panels. . . . . . . . . . . . . . . . . . . . . . . . 117
3-16 Connecting A-D Outputs of the Expansion Shelf to the High-Density Wire-wrap
Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

List of Figures
10 TimeHub 5500 User’s Guide 097-55501-01 Revision M – October 2008
3-17 Connecting E-H Outputs of the Expansion Shelf to the High-Density Wire-wrap
Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
3-18 Input/Alarm Connector Module Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
3-19 Daisy-chaining One Input to Multiple NTP Output Connector Modules . . . . . . . . 122
3-20 Power and Ground Connections on the Expansion Shelf . . . . . . . . . . . . . . . . . . 126
3-21 Address Switch SW1 on the Expansion Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
3-22 Location of Output Connector Modules on the Rear Panel of the Master/Remote
Shelf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
3-23 Connecting a Single Expansion Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
3-24 Connecting Multiple Expansion Shelves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
4-1 Front Panel of the TimeHub 5500 Shelf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
4-2 Location of Switch S1 on the Management Card. . . . . . . . . . . . . . . . . . . . . . . . . 140
4-3 Front Panel of the Management Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
4-4 Front Panel of the Clock Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
4-5 Location of Clock Card Switch S1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
4-6 The TimeHub TimeScan THC Window in Serial Mode . . . . . . . . . . . . . . . . . . . . 150
4-7 The TCP/IP Dialog Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
4-8 Network Parameters Dialog Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
4-9 Set TimeHub Date and Time Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
4-10 Set TimeHub System ID Window. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
4-11 Set TimeHub Target ID Window. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
4-12 The TimeScan THC Input Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
4-13 The Remote Input Configuration Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
4-14 The Remote Input Configuration Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
4-15 Configuring Outputs Using TimeScan THC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
4-16 DS1 Output Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
4-17 CC Output Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
4-18 The Configuration Output Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
4-19 Enabling Ports for CC Cable Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
4-20 The Sync Server Window in SymmTime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
4-21 The New Server Window in SymmTime. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
4-22 The Synchronization Status Window in SymmTime. . . . . . . . . . . . . . . . . . . . . . . 193
4-23 The User Administration Dialog Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
5-1 The Configuration Output Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
5-2 Attempt to Clear Port Alarm Query Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
5-3 Active DS1 Input Signal Indication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
5-4 Front Panel of the Clock Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
5-5 SNDRIFT Decision Tree. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
5-6 Front Panel of the Output Driver Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
5-7 Front Panel of the Management Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
5-8 Front Panel of the Expansion Controller Card . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
5-9 Front Panel of the 5 MHz Output Driver Card . . . . . . . . . . . . . . . . . . . . . . . . . . . 233
5-10 Front Panel of the NTP Server Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
5-11 Location of Fuse XF1 on the Clock Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
5-12 Location of Fuse F1 on the Management Card and the Output Driver Card . . . . 245
5-13 Location of Fuse F1 on the EC Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
5-14 The TimeHub WARP Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249
5-15 The WARP Log Window. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249
5-16 TimeHub Clock Directory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
5-17 Example FTP Download Process, Part 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253

097-55501-01 Revision M – October 2008 TimeHub 5500 User’s Guide 11
List of Figures
5-18 Example FTP Download Process for Clock 1, Part 2. . . . . . . . . . . . . . . . . . . . . . 255
5-19 Example FTP Download Process, Part 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
A-1 Connectors on the Rear Panel of the Master Shelf . . . . . . . . . . . . . . . . . . . . . . . 282
A-2 Wire-wrap Panel Ground Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283
A-3 Power and Ground Connections on the Master Shelf . . . . . . . . . . . . . . . . . . . . . 284

List of Figures
12 TimeHub 5500 User’s Guide 097-55501-01 Revision M – October 2008

List of Tables
097-55501-01 Revision M – January 2009 TimeHub 5500 User’s Guide 13
Tables
1-1 SSM Quality Level and Meaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
1-2 SSM Source Determination for Remote Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2-1 Wire-Wrap Panels Available for the TimeHub 5500. . . . . . . . . . . . . . . . . . . . . . . . 49
2-2 Wire-Wrap Connection Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
2-3 Cable Management Panels Available for the TimeHub 5500. . . . . . . . . . . . . . . . . 49
2-4 Accessories for Adapter Panels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
2-5 Clock Card Front Panel Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
2-6 Management Card Front Panel Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
2-7 LEDs on the DS1/CC Driver Card Front Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
2-8 LEDs on the 5 MHz Output Driver Card Front Panel. . . . . . . . . . . . . . . . . . . . . . . 61
2-9 Expansion Controller Card Front Panel Indicators. . . . . . . . . . . . . . . . . . . . . . . . . 69
2-10 LEDs on the NTP Server Card Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
2-11 Status LED Indicators on the TimeHub NTP Output Connector Modules . . . . . . . 85
2-12 Master and Remote Shelf Basic Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
2-13 Expansion Shelf Basic Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
2-14 Accessories and Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
3-1 Installation Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
3-2 Master/Remote Rotary Switch Settings and Functions . . . . . . . . . . . . . . . . . . . . 102
3-3 Maximum Loading Configuration for the TimeHub Master Shelf . . . . . . . . . . . . . 108
3-4 Maximum Loading Configuration for the TimeHub Expansion Shelf . . . . . . . . . . 108
3-5 SFP Modules for the TimeHub 5500 NTP Server Card . . . . . . . . . . . . . . . . . . . . 121
3-6 Pinout of LAN Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
3-7 Pinout of Local Communications Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
3-8 Expansion Shelf Rotary Switch Settings and Functions. . . . . . . . . . . . . . . . . . . . 127
4-1 Management Card S1 Switch Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
4-2 Clock Card S1 Switch Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
4-3 Communications Port Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
4-4 Typical Oscilloscope Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
4-5 User Level and Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
4-6 Command Level and Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
5-1 Troubleshooting the Clock Card Front Using the LEDs . . . . . . . . . . . . . . . . . . . . 213
5-2 Troubleshooting the Output Driver Card Using Front Panel LEDs. . . . . . . . . . . . 221
5-3 Management Card Front Panel Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
5-4 Troubleshooting the Expansion Controller Card. . . . . . . . . . . . . . . . . . . . . . . . . . 231
5-5 Troubleshooting the 5 MHz Output Driver Card. . . . . . . . . . . . . . . . . . . . . . . . . . 234
5-6 Troubleshooting the NTP Server Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
5-7 Default Values of Keywords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
5-8 Downloading to the Second Clock Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
5-9 Downloading to the IMC Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
5-10 Backing Up the New Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258
5-11 Troubleshooting NTP Firmware Download Responses . . . . . . . . . . . . . . . . . . . . 262
6-1 Management Card Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
6-2 Clock Card Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
6-3 DS1 and E1 Output Module Default Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
6-4 User Changes to Factory Default Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

List of Tables
14 TimeHub 5500 User’s Guide 097-55501-01 Revision M – January 2009

097-55501-01 Revision M – January 2009 TimeHub 5500 User’s Guide 15
How to Use This Guide
This section describes the format, layout, and purpose of this guide.
In This Preface
Purpose of This Guide
Who Should Read This Guide
Structure of This Guide
Conventions Used in This Guide
Warnings, Cautions, Recommendations, and Notes
Related Documents and Information
Where to Find Answers to Product and Document Questions
What’s New In This Guide

16 TimeHub 5500 User’s Guide 097-55501-01 Revision M – January 2009
How to Use This Guide
Purpose of This Guide
Purpose of This Guide
The TimeHub 5500 User’s Guide describes the procedures for unpacking, installing,
using, maintaining, and troubleshooting the Symmetricom TimeHub 5500. It also
includes appendixes that describe alarms and events,the languages that you use to
communicate with the TimeHub 5500, default values, and other information.
Who Should Read This Guide
Chapter 1, Description, is written for technical audiences who need general
information about the product. Chapter 2, Engineering Ordering Information, and
subsequent chapters contain technical information about the product. Other
chapters and appendixes describe installation, maintenance, and configuration
instructions or details primarily intended for qualified maintenance personnel.
This User Guide is designed for the following categories of users:
Systems Engineers – Chapter 1 provides an introduction to the TimeHub 5500,
Cross-references in this chapter direct you to detailed system information in other
chapters as appropriate.
Installation Engineers – Chapter 2 through Chapter 6 provides detailed
information and procedures to ensure proper installation, turn-up, operation,
configuration, and testing of the TimeHub 5500.
Maintenance Engineers –Chapter 5 provides preventive and corrective
maintenance guidelines, as well as procedures for diagnosing and
troubleshooting fault indications and alarms.
While Chapter 1 is written for technical audiences who need information about the
TimeHub 5500 system, others, such as Chapter 2 through Chapter 6 contain
detailed information and instructions which are intended to be performed by
qualified personnel only.

097-55501-01 Revision M – January 2009 TimeHub 5500 User’s Guide 17
How to Use This Guide
Structure of This Guide
Structure of This Guide
This guide contains the following sections and appendixes:
Chapter, Title Description
Chapter 1, Description Provides an overview of the product, describes the major
hardware and software features, and lists the system
specifications.
Chapter 2, Engineering Ordering
Information Describes the modules and cards available with the TimeHub
5500 and provides the part numbers for the parts and accessories.
Chapter 3, Installing the TimeHub
5500 Contains procedures for unpacking and installing the product, and for powering up the unit.
Chapter 4, Testing and
Configuring the TimeHub Provides checklist-based commissioning tests that should be performed after completing turn-up and software configuration to
ensure the system is ready for normal operation.
Describes the ICS and TL1 commands required to provision the
TimeHub 5500 after installing the unit.
Chapter 5, Maintaining the
TimeHub 5500 Contains preventive and corrective maintenance, and troubleshooting procedures for the product.
Chapter 6, Specifications Lists the specifications for the TimeHub 5500.
Appendix A, Maintenance of
Prior Master and Expansion
Shelves
Provides ground and power maintenance information for prior
master and expansion shelves.

18 TimeHub 5500 User’s Guide 097-55501-01 Revision M – January 2009
How to Use This Guide
Conventions Used in This Guide
Conventions Used in This Guide
This guide uses the following conventions:
Acronyms and Abbreviations – Terms are spelled out the first time they appear
in text. Thereafter, only the acronym or abbreviation is used.
Revision Control – The title page lists the printing date and versions of the
product this guide describes.
Typographical Conventions – This guide uses the typographical conventions
described in the table below.
When text appears
this way... ... it means:
TimeHub 5500 User’s Guide The title of a document.
SSU
CRITICAL
IOC1
An operating mode, alarm state, status, or chassis label.
Select File, Open... Click the Open option on the File menu.
Press Enter
Press ;A named keyboard key. The key name is shown as it appears on the keyboard.
An explanation of the key’s acronym or function
immediately follows the first reference to the key, if
required.
SSU
Username: Text in a source file or a system prompt or other text that
appears on a screen.
PING
STATUS A command you enter at a system prompt or text you
enter in response to a program prompt. You must enter
commands for case-sensitive operating systems exactly
as shown.
A re-timing application A word or term being emphasized.
Symmetricom does not
recommend... A word or term given special emphasis.

097-55501-01 Revision M – January 2009 TimeHub 5500 User’s Guide 19
How to Use This Guide
Warnings, Cautions, Recommendations, and Notes
Warnings, Cautions, Recommendations, and Notes
Warnings, Cautions, Recommendations, and Notes attract attention to essential or
critical information in this guide. The types of information included in each are
explained in the following examples.
Warning: To avoid serious personal injury or death, do not disregard
warnings. All warnings use this symbol. Warnings are installation,
operation, or maintenance procedures, practices, or statements, that
if not strictly observed, may result in serious personal injury or even
death.
Caution: To avoid personal injury, do not disregard cautions. All
cautions use this symbol. Cautions are installation, operation, or
maintenance procedures, practices, conditions, or statements, that if
not strictly observed, may result in damage to, or destruction of, the
equipment. Cautions are also used to indicate a long-term health
hazard.
ESD Caution: To avoid personal injury and electrostatic discharge
(ESD) damage to equipment, do not disregard ESD cautions. All ESD
cautions use this symbol. ESD cautions are installation, operation, or
maintenance procedures, practices, conditions, or statements that if
not strictly observed, may result in possible personal injury,
electrostatic discharge damage to, or destruction of, static-sensitive
components of the equipment.
Electrical Shock Caution: To avoid electrical shock and possible
personal injury, do not disregard electrical shock cautions. All
electrical shock cautions use this symbol. Electrical shock cautions
are practices, procedures, or statements, that if not strictly observed,
may result in possible personal injury, electrical shock damage to, or
destruction of components of the equipment.
Recommendation: All recommendations use this symbol.
Recommendations indicate manufacturer-tested methods or known
functionality. Recommendations contain installation, operation, or
maintenance procedures, practices, conditions, or statements, that
provide important information for optimum performance results.
Note: All notes use this symbol. Notes contain installation, operation,
or maintenance procedures, practices, conditions, or statements, that
alert you to important information, which may make your task easier
or increase your understanding.

20 TimeHub 5500 User’s Guide 097-55501-01 Revision M – January 2009
How to Use This Guide
Related Documents and Information
.
Related Documents and Information
Other helpful documents and software tools are listed below. See your
Symmetricom representative or sales office for a complete list of available
documentation.
TimeHub 5500 TL1 Reference Guide (part number 097-55501-02)
Software Release Notice (part number 097-55502-20)
TimeScan THC management software
Where to Find Answers to Product and Document Questions
For additional information about the products described in this guide, please contact
your Symmetricom representative or your local sales office. You can also contact us
on the web at www.symmetricom.com.
What’s New In This Guide
Revision M of this guide contains the following new information:
Added Maximum Load Limits, on page 108.
Revised the information in Grounding the Shelf, on page 103.
Revised Making Ground and Power Connections, on page 102.
Revised the upper voltage limit in Power, on page 273.
Added Making Ground and Power Connections, on page 102.
Changed 10 Amps references to 5 Amps.
Added Maintenance of Prior Master and Expansion Shelves, on page 281.
Caution: Risk of explosion if battery is replaced by an incorrect type.
Dispose of used batteries using local recycling procedures.
Note: Symmetricom offers training courses designed toenhance your
knowledge of the TimeHub 5500. Contact your local representative or
sales office for a complete list of courses and outlines.