Symmetricom SSU-2000, SDU-2000 User Manual

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SSU-2000 Synchronization Supply Unit

and the

SDU-2000 Synchronization Distribution Unit

User Guide

Revision F.01 – January 2007

Part Number 12713020-002-2

Symmetricom, Inc.

2300 Orchard Parkway

San Jose, CA 95131-1017

U.S.A.

http://www.symmetricom.com

All product names, service marks, trademarks, and registered trademarks

used in this document are the property of their respective owners.

Table of Contents

Contents

How to Use This Guide

Purpose of This Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Who Should Read This Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Structure of This Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Conventions Used in This Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Warnings, Cautions, Recommendations, and Notes . . . . . . . . . . . . . . . . . . . . . . . 20

Related Documents and Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Where to Find Answers to Product and Document Questions . . . . . . . . . . . . . . . . 22

What’s New in This Document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Chapter 1 Product Overview

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Typical System Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Timing Signal Generator (TSG) Configuration . . . . . . . . . . . . . . . . . . . . . . . . . 25

Primary Reference Source (PRS) Configuration. . . . . . . . . . . . . . . . . . . . . . . . 26

SSU-2000 Configured as a Monitor-Only System. . . . . . . . . . . . . . . . . . . . . . . 26

System Architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Input Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Output Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Clock Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Communications Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Alarms and Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

SSU-2000 Main Shelf (Chassis) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

SSU-2000 Family of Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Clock and Communications Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Output Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Configuring Redundant Output Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Input and Output Adapter Panels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Communications Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Software Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Software Versions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Basic System Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Graphical User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Overview of SSU-2000 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Synchronization Status Messages (SSMs). . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Indicators and Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

SDU-2000 Synchronization Distribution Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Expansion Shelf Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Setting the Expansion Shelf Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

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Buffered Clocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

SDU Module Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Connector Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Controls and Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Chapter 2 Installing the SSU-2000

Unpacking and Inspecting the Shelf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Preliminary Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Installation Tools and Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Electromagnetic Interference (EMI) Considerations . . . . . . . . . . . . . . . . . . . . . 61

Ventilation Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Rack Mounting the SSU-2000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

SSU-2000 Shelf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

I/O Adapter Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Making Ground and Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Making Ground Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Connecting Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Making Signal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Making I/O Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Installing Output Summer Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Making Communication Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Making Ethernet Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Local Oscillator Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Remote Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Making Alarm Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Connecting Antennas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Connecting an SDU-2000 Expansion Shelf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Connecting a Single SDU-2000 Expansion Shelf . . . . . . . . . . . . . . . . . . . . . . . 77

Connecting Additional SDU-2000 Expansion Shelves . . . . . . . . . . . . . . . . . . . 78

Handling Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Installing a Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Exchanging a Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Disabling a Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Removing Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Powering Up the SSU-2000. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

SSU-2000 Main Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

SDU-2000 Expansion Shelf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Normal System Indications During Turn-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

After Turn Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

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Chapter 3 Provisioning and Operating the SSU-2000

Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

SSU-2000 Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

SSU-2000 Operating Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Establishing a Connection With the SSU-2000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Communicating by Serial Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Communicating by Ethernet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Overview of the SSU-2000 Security System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Adding An Administrator-Level User to the System. . . . . . . . . . . . . . . . . . . . . . . . . . 95

Adding Users to the System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Setting Security Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Logging In to the SSU-2000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Logging In with an Expired Password. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Logging Off of the SSU-2000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Initial Provisioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Provisioning General Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Adding or Enabling a Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Disabling a Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Removing a Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Provisioning GPS Input Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Provisioning Other Input Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Provisioning Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Saving the Provisioning Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Checking Alarm Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Factory Default (Basic) Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Retrieving Factory Defaults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Changing Factory Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Restoring Factory Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Customizing Other Configuration Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Retrieving the User Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Backing Up and Restoring Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Backing Up the Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Using ICS Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Using TL1 Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Restoring the Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Using ICS Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Using TL1 Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Chapter 4 Commissioning

Readiness to Test Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

SSU-2000 Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Equipment Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

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Commissioning Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Testing the Ethernet Communications Interface. . . . . . . . . . . . . . . . . . . . . . . 122

Testing the EIA-232 Ports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Testing The MINOR Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Testing the MAJOR Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Testing the CRITICAL Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Testing the Reference Signals and Selection. . . . . . . . . . . . . . . . . . . . . . . . . 124

Testing the Clock Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Testing the Output Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Testing the System Stability and Accuracy (Optional) . . . . . . . . . . . . . . . . . . 126

Commissioning Test Data Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Chapter 5 Maintenance and Troubleshooting

Responding to SSU-2000 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Preventive Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Corrective Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Establishing a Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Interpreting Status Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Troubleshooting the SDU-2000. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Re-ordering Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Equipment Return Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Repacking the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Equipment Return Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

Contacting Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

Chapter 6 Clock and Communications Module Reference Data

Stratum 2E Clock Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

Functional Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Stratum 3E Clock Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Performance Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

Type 1 Clock Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

Functional Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

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Communications Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

Communications Module Alarm Logic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

EIA-232 Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

Ethernet Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Resetting the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Chapter 7 Input Module Reference Data

1-Port and 3-Port E1 Input Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

1-Port and 3-Port DS1 Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

GPS Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Composite Clock Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Japanese Sine Wave Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192

Japanese Composite Clock Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196

Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197

Input Adapter Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197

Input Adapter Panel for 1-Port Input Module. . . . . . . . . . . . . . . . . . . . . . . . . . 197

Input Adapter Panel for 3-Port Input Modules. . . . . . . . . . . . . . . . . . . . . . . . . 199

Input Wire-Wrap Adapters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200

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Chapter 8 Output Module Reference Data

E1 Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206

Performance Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

DS1 Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

Performance Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210

Composite Clock Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213

Performance Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214

Japanese Composite Clock Output Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217

Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218

Japanese Sine Wave Output Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224

Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225

E1/2048 kHz Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231

Performance Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232

2048 kHz Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

Performance Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238

RS-422 Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239

Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243

Performance Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244

DS1 Line Retiming Unit (LRU). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249

Installing the Line Re-timing Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257

Provisioning the DS1 Line Re-timing Module . . . . . . . . . . . . . . . . . . . . . . . . . 257

Alarms and Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

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E1 Line Re-timing Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

Installing the E1 Line Re-timing Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261

Installing the Output Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263

Provisioning the E1 Line Re-timing Module . . . . . . . . . . . . . . . . . . . . . . . . . . 263

Alarms and Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264

Buffer Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264

Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264

Output Adapter Panels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

Balun Output Adapter Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

DE9 Output Adapter Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

High-Density Wire-Wrap Output Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267

Adapter Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267

Chapter 9 Hardware Configuration Guide

Configuring a Conventional SSU/TSG System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270

Configuring a Primary Reference Source (PRS) System. . . . . . . . . . . . . . . . . . . . . 270

Configuring a Monitor-Only System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271

Configuring a Subtending SSU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272

Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273

Input Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273

Output Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275

Setting Subtending Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275

Changing to Subtending SSU Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276

Required Hardware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

Installing Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

Changing From Subtending SSU Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

SSU-2000 Configuration Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .289

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10 SSU-2000 User Guide 12713020-002-2 Revision F.01 – January 2007

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Figures

1-1 SSU-2000 Synchronization Supply Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

1-2 SSU-2000 Configured as a TSG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

1-3 SSU-2000 Configured as a Primary Reference Source. . . . . . . . . . . . . . . . . . . 26

1-4 SSU-2000 Configured as a Monitor-Only System . . . . . . . . . . . . . . . . . . . . . . . 26

1-5 Block Diagram of the SSU-2000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

1-6 Components in a Typical SSU-2000 Installation . . . . . . . . . . . . . . . . . . . . . . . . 35

1-7 Slot Numbering Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

1-8 Rear Panel of the SSU-2000 Main Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

1-9 Location of Power Fuses on the Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

1-10 SSU-2000 Input/Output Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

1-11 I/O Adapter Panels for Input and Output Modules. . . . . . . . . . . . . . . . . . . . . . . 48

1-12 Front View of the SDU-2000 Expansion Shelf. . . . . . . . . . . . . . . . . . . . . . . . . . 52

1-13 Rear View of the SDU-2000 Expansion Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . 53

1-14 SDU-2000 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

2-1 Shelf and I/O Adapter Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

2-2 Frame and Logic Ground Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

2-3 Power Terminal Blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

2-4 SSU-2000 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

2-5 Installing the Output Summer Adapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

2-6 DTE/DCE Slide Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

2-7 Alarm Terminal Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

2-8 SDU Interface (J8) and Backup Clock (J9) Connectors. . . . . . . . . . . . . . . . . . . 76

2-9 SDU Interface (J17 and J15) and Backup Clock (J16) Connectors. . . . . . . . . . 76

2-10 SSU Interface (J8) Expansion Terminator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

2-11 Wiring Diagram for a Single SDU-2000 Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . 78

2-12 Wiring Diagram for Multiple SDU-2000 Shelves . . . . . . . . . . . . . . . . . . . . . . . . 80

2-13 SSU-2000 Power Fuses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

3-1 Direct Connection Using the Serial Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

5-1 Alarm and Event Status Breakdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

6-1 Block Diagram of the Stratum 2E Clock Module . . . . . . . . . . . . . . . . . . . . . . . . 141

6-2 Front Panel of the Stratum 2E Clock Module. . . . . . . . . . . . . . . . . . . . . . . . . . . 142

6-3 Block Diagram of the Stratum 3E Clock Module . . . . . . . . . . . . . . . . . . . . . . . . 145

6-4 Front Panel of the Stratum 3E Clock Module. . . . . . . . . . . . . . . . . . . . . . . . . . . 146

6-5 Block Diagram of the Type 1 Clock Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

6-6 Front Panel of the Type 1 Clock Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

6-7 Block Diagram of the Communications Module. . . . . . . . . . . . . . . . . . . . . . . . . 153

6-8 Front Panel of the Communications Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

7-1 Block Diagram of the 1-Port and 3-Port E1 Input Modules . . . . . . . . . . . . . . . . 161

7-2 Front Panel of the E1 Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

7-3 Block Diagram of the 1-Port and 3-Port DS1 Input Module . . . . . . . . . . . . . . . . 171

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7-4 Front Panel of the DS1 Input Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

7-5 Block Diagram of the GPS Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

7-6 Front Panel of the GPS Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

7-7 Block Diagram of the Composite Clock Input Module . . . . . . . . . . . . . . . . . . . . 185

7-8 Front Panel of the Composite Clock Input Module. . . . . . . . . . . . . . . . . . . . . . . 186

7-9 Block Diagram of the Japanese Sine Wave Input Module. . . . . . . . . . . . . . . . . 188

7-10 Front Panel of the Japanese Sine Wave Input Module . . . . . . . . . . . . . . . . . . . 191

7-11 Block Diagram of the Japanese Composite Clock Input Module. . . . . . . . . . . . 195

7-12 Front Panel of the Japanese Composite Clock Input Module . . . . . . . . . . . . . . 196

7-13 Input I/O Adapter for One-Port Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . 198

7-14 I/O Adapter for 3-Port Input Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199

7-15 Input Wire-Wrap Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

8-1 Block Diagram of the E1 Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205

8-2 Front Panel of the E1 Output Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206

8-3 Block Diagram of the DS1 Output Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

8-4 Front Panel of the DS1 Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

8-5 Block Diagram of the Composite Clock Output Module. . . . . . . . . . . . . . . . . . . 212

8-6 Front Panel of the Composite Clock Output Module . . . . . . . . . . . . . . . . . . . . . 213

8-7 Block Diagram of the Japanese Composite Clock Output Module. . . . . . . . . . . 216

8-8 Front Panel of the Japanese Composite Clock Output Module. . . . . . . . . . . . . 217

8-9 Block Diagram of the Japanese Sine Wave Output Module . . . . . . . . . . . . . . . 219

8-10 Using the Hex Number to Identify Output Ports. . . . . . . . . . . . . . . . . . . . . . . . . 221

8-11 Front Panel of the Japanese Sine Wave Output Module. . . . . . . . . . . . . . . . . . 224

8-12 Using the Hex Number to Identify Output Ports. . . . . . . . . . . . . . . . . . . . . . . . . 227

8-13 Block Diagram of the E1/2048 kHz Output Module . . . . . . . . . . . . . . . . . . . . . . 230

8-14 Front Panel of the E1/2048 kHz Output Module . . . . . . . . . . . . . . . . . . . . . . . . 231

8-15 Block Diagram of the 2048 kHz Output Module. . . . . . . . . . . . . . . . . . . . . . . . . 234

8-16 Using the Hex Number to Identify Output Ports. . . . . . . . . . . . . . . . . . . . . . . . . 235

8-17 Front Panel of the 2048 kHz Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

8-18 Block Diagram of the RS-422 Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . 240

8-19 Using the Hex Number to Identify Output Ports. . . . . . . . . . . . . . . . . . . . . . . . . 241

8-20 Front Panel of the RS-422 Output Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243

8-21 Recommended Installation Schematic for the DS1 LRU . . . . . . . . . . . . . . . . . . 247

8-22 Block Diagram of the DS1 LRU Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248

8-23 Front Panel of the DS1 LRU Four-Port Module . . . . . . . . . . . . . . . . . . . . . . . . . 249

8-24 Recommended SSU-2000 Slots for Installing the DS1 LRM. . . . . . . . . . . . . . . 251

8-25 SDU-2000 Recommended Slots for DS1 LRM Installation . . . . . . . . . . . . . . . . 252

8-26 Installing the Cut-Through Assembly in the SSU-2000 . . . . . . . . . . . . . . . . . . . 253

8-27 Installing the Cut-Through Assembly in the SDU-2000 . . . . . . . . . . . . . . . . . . . 254

8-28 Orientation of the SSU-2000 I/O and CTA I/O Connector Pins . . . . . . . . . . . . . 256

8-29 Wire-wrap Identification Overlay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257

8-30 E1 LRM Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259

8-31 Front Panel of the E1 LRM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

8-32 Sample Rack Mounting with Input Module, SSU-2000, and Output Panel . . . . 262

8-33 DE9 Output Panel for the E1 LRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263

8-34 BNC Output Panel for the E1 LRU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263

8-35 Front Panel of the Buffer Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265

12 SSU-2000 User Guide 12713020-002-2 Revision F – October 2006

Table of Contents

8-36 Balun Output I/O Adapter Panel for Output Module. . . . . . . . . . . . . . . . . . . . . . 266

8-37 Output I/O Adapter Panel, DE9 Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

8-38 High-Density Wire-Wrap Output Panels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267

9-1 Time Sync Generator (TSG) System Configuration. . . . . . . . . . . . . . . . . . . . . . 270

9-2 SSU-2000 Configured as PRS System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271

9-3 SSU-2000 Configured as Monitor-Only System. . . . . . . . . . . . . . . . . . . . . . . . . 272

9-4 SSU-2000 I/O Adapter Panels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

9-5 SDU-2000 Synchronization Distribution Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

12713020-002-2 Revision F – October 2006 SSU-2000 User Guide 13

Table of Contents

14 SSU-2000 User Guide 12713020-002-2 Revision F – October 2006

Table of Contents

Tables

1-1 Slot Assignments for Specific Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

1-2 Versions of Software for the Communications Module. . . . . . . . . . . . . . . . . . . . 50

1-3 Expansion Shelf Addresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

2-1 I/O Module Slot to I/O Connector Relationship . . . . . . . . . . . . . . . . . . . . . . . . . 67

2-2 Communications Port Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

2-3 EIA-232 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

2-4 Alarm Relay Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

2-5 Communications and Buffer Module LED Indications . . . . . . . . . . . . . . . . . . . . 86

3-1 Communications Port Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

3-2 Firmware Requirements for Security Features . . . . . . . . . . . . . . . . . . . . . . . . . 94

3-3 User Access Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

4-1 SSU-2000 Readiness Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

4-2 Commissioning Test Data Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

5-1 SSU Corrective Action Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

5-2 SDU Corrective Action Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

5-3 SSU-2000 Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

5-4 SDU-2000e Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

6-1 Stratum 2E Clock Module Status LED Indicators. . . . . . . . . . . . . . . . . . . . . . . . 142

6-2 Stratum 2E Clock Module Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

6-3 Stratum 3E Clock Module Status LED Indicators. . . . . . . . . . . . . . . . . . . . . . . . 146

6-4 Stratum 3E Clock Module Performance Specifications . . . . . . . . . . . . . . . . . . . 147

6-5 Type 1 Clock Module Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

6-6 Type 1 Clock Module Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

6-7 Communications Module Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . 154

6-8 Communications Module Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

7-1 E1 Input Module Alarm Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

7-2 E1 Input Module Event Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

7-3 E1 Input Module Status LED Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

7-4 E1 Input Module Configuration Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

7-5 DS1 Input Module Alarm Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173

7-6 DS1 Input Module Event Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

7-7 DS1 Input Module Status LED Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

7-8 DS1 Input Module Configuration Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

7-9 GPS Input Module Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

7-10 GPS Input Module Configuration Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

7-11 Composite Clock Input Module Status LED Indicators . . . . . . . . . . . . . . . . . . . 186

7-12 Composite Clock Input Module Configuration Settings . . . . . . . . . . . . . . . . . . . 187

7-13 Japanese Sine Wave Input Module Status LED Indicators . . . . . . . . . . . . . . . . 192

7-14 Japanese Sine Wave Input Module Configuration Settings. . . . . . . . . . . . . . . . 192

7-15 Japanese Composite Clock Input Module Status LED Indicators . . . . . . . . . . . 196

7-16 Japanese Composite Clock Input Module Configuration Settings . . . . . . . . . . . 197

12713020-002-2 Revision F – October 2006 SSU-2000 User’s Guide 15

Table of Contents

7-17 Pinout for the I-Port Input Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198

7-18 Pinout for the 3-Port Input Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200

7-19 Input Wire-Wrap Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200

8-1 E1 Output Module Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206

8-2 E1 Output Module Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 207

8-3 DS1 Output Module Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

8-4 DS1 Output Module Performance Specifications. . . . . . . . . . . . . . . . . . . . . . . . 210

8-5 Composite Clock Output Module Status LED Indicators . . . . . . . . . . . . . . . . . . 213

8-6 Composite Clock Output Module Performance Specifications. . . . . . . . . . . . . . 214

8-7 Japanese Composite Clock Output Module Status LED Indicators. . . . . . . . . . 217

8-8 Japanese Composite Clock Output Module Configuration Settings. . . . . . . . . . 218

8-9 Identifying Failed Ports From The Hex Digit. . . . . . . . . . . . . . . . . . . . . . . . . . . . 221

8-10 Japanese Sine Wave Output Module Status LED Indicators. . . . . . . . . . . . . . . 224

8-11 Japanese Sine Wave Output Module Configuration Data . . . . . . . . . . . . . . . . . 225

8-12 Identifying Failed Ports from the Hex Digit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228

8-13 E1/2048 kHz Output Module Status LED Indicators . . . . . . . . . . . . . . . . . . . . . 231

8-14 E1/2048 kHz Output Module Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . 232

8-15 Identifying Failed Ports from the Hex Digit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236

8-16 2048 kHz Output Module Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . 238

8-17 2048 kHz Output Module Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238

8-18 Identifying Failed Ports from the Hex Digit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242

8-19 RS-422 Output Module Status LED Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . 244

8-20 RS-422 Output Module Performance Specifications . . . . . . . . . . . . . . . . . . . . . 244

8-21 LRM Kits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

8-22 DS1 LRU Module Status LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249

8-23 SSU-2000 and CTA I/O Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255

8-24 Line Re-timing Module Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257

8-25 Status LED Indicators on the E1 LRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261

8-26 E1 Line Re-timing Module Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263

8-27 Buffer Module LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265

8-28 Adapter Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267

9-1 Minimum Software Versions for Subtending Operation . . . . . . . . . . . . . . . . . . . 276

9-2 Files Required for Upgrading the Firmware. . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

9-3 SSU-2000 System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

16 SSU-2000 User’s Guide 12713020-002-2 Revision F – October 2006

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 Document

12713020-002-2 Revision F.01 – January 2007 SSU-2000 User’s Guide 17

How to Use This Guide

Purpose of This Guide

The SSU-2000 User’s Guide describes the procedures for unpacking, installing, using, maintaining, and troubleshooting the Symmetricom SSU-2000 Synchronization Supply Unit. An accompanying document, the SSU-2000 Technical Reference (12713020-003-2) describes default alarms and events, the languages you use to communicate with the SSU-2000, default values, and other information.

Who Should Read This Guide

Chapter 1, Product Overview, is written for non-technical audiences who need

general information about the product. Chapter 2, Installing the SSU-2000 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 SSU-2000.

Cross-references in this chapter direct you to detailed system information in other chapters as appropriate.

 Installation Engineers – Chapter 2 through Chapter 9 and the Appendices

provide detailed information and procedures to ensure proper installation, turn-up, operation, configuration, and testing of the SSU-2000.

 Maintenance Engineers – Chapter 5 and the Appendices provide preventive and

corrective maintenance guidelines, as well as procedures for diagnosing and troubleshooting fault indications and alarms.

While Chapter 1 is written for non-technical audiences who need information about the SSU-2000 system, others, such as Chapter 2 through Chapter 9 contain detailed information and instructions which are intended to be performed by qualified personnel only.

18 SSU-2000 User’s Guide 12713020-002-2 Revision F.01 – January 2007

How to Use This Guide

Structure of This Guide

This guide contains the following chapters and appendixes:

Chapter, Title Description

Chapter 1, Product Overview Provides an overview of the product and describes the major

hardware and software features.

Chapter 2, Installing the SSU-2000 Contains procedures for unpacking and installing the product. Chapter 3, Provisioning and

Operating the SSU-2000 Chapter 4, Commissioning Provides checklist-based commissioning tests that should be

Chapter 5, Maintenance and Troubleshooting

Chapter 6, Clock and Communications Module Reference Data

Chapter 7, Input Module Reference Data

Chapter 8, Output Module Reference Data

Chapter 9, Hardware Configuration Guide

Index

Describes

the SSU-2000 after installing the unit.

performed after completing turn-up a nd software configuration

to ensure the system is ready for normal operation.

Contains preventive and corrective maintenance, and

troubleshooting procedures for the product.

Provides detailed information on the Commu nications module

and the various Clock modules available for use in the

SSU-2000.

Contains detailed information on the Input modules available

for use in the SSU-2000.

Describes the Output modules available for use in the

SSU-2000 and the SDU-2000.

Describes how to configure the SSU-2000 in several modes,

and lists part numbers for shelves, modules, and accessories.

Provides references to individual topics within this guide.

the ICS and TL1 commands required to provision

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.

12713020-002-2 Revision F.01 – January 2007 SSU-2000 User’s Guide 19

How to Use This Guide

When text appears

this way...

SSU-2000 User’s Guide The title of a document. SSU

CRITICAL Select File, Open... Click the Open option on the File menu. Press

Enter

Press ;

SSU Username:

PING STATUS

A re-timing application A word or term being emphasized. Symmetricom does not

recommend...

An operating mode, alarm state, status, or chassis label.

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.

Text in a source file or a system prompt or other text that appears on a screen.

A command you enter at a system prompt or text you enter in response to a program prompt. You must enter commands for case-sensitiv e operating systems exactly as shown.

A word or term given special emphasis.

... it means:

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 indi cat e a lon g- te rm health hazard.

20 SSU-2000 User’s Guide 12713020-002-2 Revision F.01 – January 2007

How to Use This Guide

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, electr ical 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 importa nt information, which may make your task easier or increase your understanding.

Chapter 1 Product Overview

This chapter describes the SSU-2000, and provides a theory of operation for the unit. The SDU-2000 expansion shelf is introduced and described.

In This Chapter

 Overview  Typical System Configurations  System Architecture  System Components  Communications Protocol  Overview of SSU-2000 Operation  Indicators and Controls  SDU-2000 Synchronization Distribution Unit

12713020-002-2 Revision F.01 – January 2007 SSU-2000 User’s Guide 23

Chapter 1 Product Overview

Overview

The SSU-2000 Synchronization Supply Unit (SSU-2000), shown in Figure 1-1, is a high-performance, Synchronization Status Messaging (SSM)-compliant Timing Signal Generator (TSG) or Synchronization Supply Unit that provides network synchronization signals for the telephone and telecommunications industry.

Figure 1-1. SSU-2000 Synchronization Supply Unit

The SSU-2000 conforms to specifications for International, European and North American applications as a Primary Reference Source (PRS), and Synchronization Supply Unit (SSU), and Timing Signal Generator (TSG). The SSU-2000 allows for the integration of a variety of synchronization reference schemes including GPS and land line DS1/E1. The SSU-2000 meets or exceeds performance requiremen t s for ANSI and Telcordia Technologies (Bellcore) Stratum 2 and ITU and ETSI T ype II Transit Node clocks.

The SSU-2000 is designed to comply with the application flexibility and redunda ncy concepts introduced in Telcordia Technologies (formerly Bellcore) GR-2830. A selection of hot-swappable modules and powerful software allow users to easily reconfigure, upgrade, or expand the SSU-2000 to meet a variety of telecommunications synchronization application requirements.

The SSU-2000 fully supports Synchronization Status Messaging (SSM) as defined by ANSI, Telcordia Technologies, ITU, and ETSI.

24 SSU-2000 User’s Guide 12713020-002-2 Revision F.01 – January 2007

The SSU-2000 is fully user-configurable and manageable through a software interface. Modules can be inserted or removed from the SSU-2000 while the system is operational without any degradation of output signals. Each module supports the management of critical, major and minor alarms, locally and remotely. Output modules and clock modules can be configured in redundant pairs, further increasing system availability.

The SSU-2000 has extensive event detection, reporting, alarming, and storage capabilities that permit monitoring of the system from external sites. Events are defined as changes in conditions within the unit, or at the interfaces of the unit, which may indicate abnormal operation or a change in the unit’s operational st atus. For example, an event may be a parameter which exceeds a user-set threshold (usually 2 thresholds are provided). Each event can be assigned by the user to one of four modes, including IGNORE, REPORT, ALARM, or FAIL.

Typical System Configurations

The modular design of the SSU-2000 permits a great deal of flexibility in configuring the system components for a variety of applications. Three of the more common configurations include:

Chapter 1 Product Overview

Typical System Configurations

 Time Signal Generator (TSG) configuration  Primary Reference Source (PRS) configuration  Monitor-only configuration

Timing Signal Generator (TSG) Configuration

The Timing Signal Generator (TSG) configuration shown in Figure 1-2 allows for input of external references to which the Clock modules are phase- and frequencylocked. This configuration allows for monitoring of several inputs, and for synchronization of output signals.

Figure 1-2. SSU-2000 Configured as a TSG

12713020-002-2 Revision F.01 – January 2007 SSU-2000 User’s Guide 25

Chapter 1 Product Overview

Typical System Configurations

Primary Reference Source (PRS) Configuration

In a Primary Reference Source (PRS) configuration (Figure 1-3), the SSU-2000 meets the specifications defined in American National Standards Institute (ANSI) T1.101-1999. ANSI defines a Primary Reference Source as “equipment that

provides a timing signal whose long term accuracy is maintained at 1x10 better, with verification to Universal Coordinated Time (UTC), and whose timing signal may be used as the basis of reference for the control of other clocks within a network”. If standard Input modules are installed in the remaining input slots, this configuration also allows for monitoring of up to 24 external signals, such as DS1, E1, composite clock, and various clock frequencies. Time-of-day functionality is available through an Ethernet port employing NTP.

-11

Figure 1-3. SSU-2000 Configured as a Primary Reference Source

SSU-2000 Configured as a Monitor-Only System

The SSU-2000 can also be configured as a monitor-only system (Figure 1-4) in which one of the inputs is designated as the reference, and a clock module is locked

directly to this signal. The remaining input signals are then compared to the phase-locked oscillators (and indirectly to the designated input reference).

The SSU-2000 continuously monitors the integrity of the incoming timing signal. The operator defines input acceptance criteria and sets parameters for alarming. When the incoming signal is acceptable (within the performance limits set by the operator), the SSU-2000 phase-locks to the signal on a priority basis.

Figure 1-4. SSU-2000 Configured as a Monitor-Only System

26 SSU-2000 User’s Guide 12713020-002-2 Revision F.01 – January 2007

System Architecture

The SSU-2000 system is a Timing Signal Generator that generates, monitors, controls, and distributes network synchronization signals. These signals can be DS1, E1, Composite Clock (CC), sinusoids, or square waves. The SSU-2000 continuously monitors incoming timing signal integrity. The operator defines input acceptance criteria and sets parameters for alarming. If a reference signal is acceptable (within the performance limits set by an operator), the SSU-2000 frequency-locks to the signal on a priority basis. System holdover and filtering performance is dependent on the quality of oscillators used in the SSU-2000’s internal Clock modules (Type 1, Stratum 2E or Stratum 3E).

A selection of hot-swappable modules and powerful software allows users to easily configure, upgrade, or expand the SSU-2000 shelf to meet a variety of telecommunications synchronization application requirements. Modules can be inserted or removed from the SSU-2000 while the shelf is operational without any degradation of output signals. Each module supports the management of critical, major, and minor alarms. Output modules and Clock modules can be configured in redundant pairs for increased reliability.

Chapter 1 Product Overview

System Architecture

A simplified block diagram for the SSU-2000 is shown in Figure 1-5.

Figure 1-5. Block Diagram of the SSU-2000

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System Architecture

As indicated in Figure 1-5, the SSU-2000 consists of four major sections:

 Input section  Clock section  Output section  Communications section

Input Section

The input section consists of one to nine Input modules to which you connect reference signals that are tested for signal integrity; the Input modules are described in Chapter 7, Input Module Reference Data. You provision each input using the Interactive Command Set (ICS) INPUT and REF commands or the Transaction Language One (TL1) SET-PRMTR-INPUT and SET-INPUT-REF commands.

The Input modules measure the phase between the input signal and the clock oscillator(s). From these phase measurements, the DS1/E1 Input modules compute frequency offset and wander of the input signals. Wander is reported in terms of Maximum Time Interval Error (MTIE) and Time Deviation (TDEV). The data is then stored for use in the SSU-2000 and reported through the Communications module. You can install one or two GPS Input modules that use the satellite-based Global Positioning System signals as a synchronization reference.The Input signal types supported are:

 DS1/Clock (unframed)  E1/Clock (unframed)  GPS  Composite Clock  Japan Composite Clock  Japan Sine Wave

Selecting the Input

Many factors influence which input reference the SSU-2000 uses:

 Priority  PQL/SSM  Switching mode  User-assigned Input S tate  Active alarms on an input

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System Architecture

You can provision the SSU-2000 to automatically select the highest-quality input signal, or you can manually select the input signal you want to use. Two factors determine the quality of the input: the user-defined Priority level, and the PQL/ SSM. These factors are used to determine which input is used, and what happens if that input becomes disqualified.

Priority Level

You can assign a Priority level to each input; this value helps determine which input is used as the system reference. The range is 0 to 10; the lower the Priority level, the higher the priority. Use the TL1 command SET-PRMTR- INPUT or the ICS command INPUT to provision this parameter . See Setting the Input Selection Mode, on page 30, for details on using the Priority level.

SSMs and Quality Level

Synchronization Status Messages (SSMs) may be included in the bit stream of the incoming signal to indicate its quality level. To read the incoming SSM, you must provision the input to read the SSM; for E1 signals, you must also provision the bit position of the incoming SSM. Use the TL1 command SET-PRMTR-INPUT or the ICS command INPUT to provision these parameters.

If the incoming signal does not include SSMs, or if you disable them, then you can provision the Quality Level to an appropriate value. The PQL value is used in the same manner as the incoming SSM to determine which input is used when the active input is disqualified. SSMs are described in more detail in Synchronization

Status Messages (SSMs), on page 51.

Setting the Reference Switching Mode

Telcordia GR-378 and GR-1244 define two reference selection modes: Revertive and Non-revertive. In the Revertive mode, if an input used as the system reference is disqualified (for any reason), the reference switches to the next-highest input and reverts to the initial input when that input is re-qualified. In this mode, the reference switches two times: once when the disqualifying event occurs, and again when the initial input is re-qualified. In the Non-revertive mode, the system reference switches to the next-highest input but does not revert to the initial input when the initial input is re-qualified. The system reference switches only once when the disqualifying event occurs.

The ICS command REF and the TL1 command SET-INPUT-REF allows you to set the reference switching mode to AutoReturn, AutoSwitch, or OFF. The AutoReturn mode is Revertive, and enables automatic switching with automatic return to the input with the highest Priority or PQL level. The AutoSwitch mode is Non-revertive; the reference automatically switches to the next-highest input on failure of the selected input. When set to OFF, only manual switching is allowed. If the selected reference input is disqualified for any reason, the clock enters the Holdover mode and you must correct the fault and re-provision the reference input.

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System Architecture

Setting the Input Selection Mode

The ICS command REF and the TL1 command SET-INPUT-REF determine what type of reference input selection and reference switching is used. You can set the input selection to either Priority or PQL. The reference switching mode is either Autoreturn, Autoswitch, or No switching.

After you select the reference switching mode, the Input module reads and processes the Priority level and PQL value to determine the traceability of inputs. This traceability information is then used by the Clock modules in selecting a reference signal and for embedding the SSM into the outputs.

If you select Priority mode, the SSU-2000 selects the input reference with the highest user-defined Priority setting; if all inputs have the same Priority level, then the input with the highest PQL (quality level, SSM) is used.

If you select PQL mode, the SSU-2000 selects the input reference with the highest assigned PQL level or associated SSM; if all inputs have the same PQL/SSM value , then the input with the highest Priority levels is used. In either case, error conditions such as Loss of Signal (LOS), Out of Frame (OOF), MTIE, TDEV, and Phase performance data collected at the input s are used to disqualify input s (prevent inpu t selection) based on user defined thresholds.

In either mode, when the Priority and PQL values are equal for each input, the physical location of the Input module determines the priority for selecting the input reference. Port 1 on the Input module in the leftmost slot has the highest priority; the priority decreases to port 1 on the Input module in the rightmost slot. Port 2 on the module in the leftmost slot has the next lower priority, decreasing to Port 2 on the Input module in the rightmost slot. Port 3 on the module in the leftmost slot has the next lower priority, and Port 3 on the module in the rightmost slot has the lowest priority.

If the Input module is configured for provisioned mode, it reports the user-assigned SSM. If it is configured for automatic mode, the Input module uses the most recent valid SSM. If a valid SSM is not received, the module uses the user-assigned SSM.

Setting an Input Alarm Strategy

You can provision the SSU-2000 to elevate input alarms to the next higher level after a specified amount of time. You can also specify that an alarm clears automatically after a specified period of time without the alarm condition. For more information on alarms, see Alarms and Events, on page 32.

Bypass Clock (Clock C)

In the event that both Clock modules fail, an input connected to a D1, E1, or Composite Clock Input module can serve as the system reference. The input must be a valid reference, and it must have a Priority setting. When the Bypass clock is the active reference, then the output signal is not filtered and any wander or jitter on the input signal appears on the outputs. The Bypass clock is intended only for short-term use; you should resolve the failures on the Clock modules as quickly as possible.

30 SSU-2000 User’s Guide 12713020-002-2 Revision F.01 – January 2007

+ 266 hidden pages

Symmetricom SSU-2000, SDU-2000 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

How to Use This Guide

Chapter 1 Product Overview

Overview

Typical System Configurations

Timing Signal Generator (TSG) Configuration

Primary Reference Source (PRS) Configuration

SSU-2000 Configured as a Monitor-Only System

System Architecture

Input Section