Symmetricom XLi IEEE 1588 Clock User Manual

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XLi IEEE 1588 Clock

User Guide

997-01510-03, Rev. C, December 2006

Notices

Symmetricom, Inc. Timing Test & Measurement 3750 Westwind Blvd. Santa Rosa, CA 95403-1053 http://www.symmetricom.com

Copyright © 2006, 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. The manual’s contents do not apply to previously released versions of XLi hardware or software.

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Table of Contents

1: Overview and Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Standard Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

1588-Related Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

IEEE 1588 card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

IEEE 1588 Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Network Port (“1588”) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

PPS Output (“SYNC OUT”) . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

GPS C/A Receiver (87-8028-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Standard TCVCXO Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Standard 110 VAC Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . .6

Clock Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

2: System Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Mechanical/Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

AC Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

System Time & Frequency Accuracy . . . . . . . . . . . . . . . . . . . . . . . . .10

GPS Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Aux Ref Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Standard Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Serial I/O Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

NET – Network Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

J1 Input – Time Interval - Event Time . . . . . . . . . . . . . . . . . . . . . .12

J2 Output – Rate Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

J3 Input – Auxiliary Reference . . . . . . . . . . . . . . . . . . . . . . . . . . .13

1 PPS – Pulse Per Second Output . . . . . . . . . . . . . . . . . . . . . . . .13

CODE – Time Code Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

ALARM Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

3: Installation and Set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Installing the GPS Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Selecting a GPS Antenna Site . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Verifying the Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Mounting the GPS Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

GPS Signal Strength Requirements . . . . . . . . . . . . . . . . . . . . . . .17

Making Additional Connections and Powering Up . . . . . . . . . . . . . . .18

Configuring Network Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Configuring the XLi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

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Configuring the IEEE 1588 Card(s) . . . . . . . . . . . . . . . . . . . . . . . . . 20

PTP Master . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

PTP Slave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Rack Mounting the XLi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4: User Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Alarm Status LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Keypad/Display Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Time Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Status Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Menu Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Keypad Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Keypad Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Command Line Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Logging In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Operator Login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Guest Login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Logging Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Changing Username and Password . . . . . . . . . . . . . . . . . . . . . . . 30

Session Timeout and Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Web Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

User Privileges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Sessions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

User Names and Passwords . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Logging In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Navigating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Submitting Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Logging Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5: Function Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Function Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

F1 – Time Zone Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

F2 – 12/24 Hour Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

F3 – Time & Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

F4 – Serial Port Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

F5 – Time-Quality Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

F6 – Keypad Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

F8 - Continuous Time Once-per-Second . . . . . . . . . . . . . . . . . . . . . 46

The Format of the F8 Output String . . . . . . . . . . . . . . . . . . . . . . . 47

While Synchronizing to a Reference Source . . . . . . . . . . . . . . . . 48

After Loosing a Reference Source . . . . . . . . . . . . . . . . . . . . . . . . 48

F9 - Time On Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

F11 - Time Output Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

F13 – Time Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

F18 – Software Version Request . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

F27 – FTM III Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

F42 – Multicode Output Configuration . . . . . . . . . . . . . . . . . . . . . . . 53

F44 – N.8 Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . 53

F50 – GPS Receiver LLA/XYZ Position . . . . . . . . . . . . . . . . . . . . . . 53

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F51 – GPS Antenna Cable Delay . . . . . . . . . . . . . . . . . . . . . . . . . . .55

F52 – Distribution Cable Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

F53 – GPS Operation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

F60 – GPS Receiver Satellite List . . . . . . . . . . . . . . . . . . . . . . . . . . .60

F66 – Daylight Saving Time (DST) Mode . . . . . . . . . . . . . . . . . . . . . .63

F69 – Time Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

F71 – Oscillator Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

F72 – Fault Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

F73 – Alarm Control / Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

F74 – Clock Source Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

F90 – Code Output Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . .78

F100 – Network Port Configuration & XLi Firmware . . . . . . . . . . . . .80

F100 EA – Ethernet Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82

F100 IP – IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82

F100 SM – Subnet Mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

F100 G – Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

F100 IC – Network Port Settings . . . . . . . . . . . . . . . . . . . . . . . . . .85

F100 BASET – 10/100 BASE- T . . . . . . . . . . . . . . . . . . . . . . . . . .85

F100 L/LOCK/UNLOCK – Remote Lockout . . . . . . . . . . . . . . . . .86

F100 L – Remote Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

F100 ST – Self Test Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88

F100 BH – Burn Host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

F100 BUB – Burn BootLoader . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

F100 BU – Burn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90

F100 BF – Burn File System . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91

F100 BUFP – Burn FPGA Firmware . . . . . . . . . . . . . . . . . . . . . . .91

F100 CONFIG – Configure NTP & SNMP . . . . . . . . . . . . . . . . . . .92

F100 J – Factory Mode Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . .93

F100 K I L L – Reboot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94

F100 P – Change User Password . . . . . . . . . . . . . . . . . . . . . . . . .95

F100 PI – PING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96

F100 PN – Change User Name . . . . . . . . . . . . . . . . . . . . . . . . . . .97

F108 – Oscillator Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98

F110 – J1 Input (TIET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99

F111 – J2 Output (Rate) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102

F113 – J3 Input Configuration (Aux Ref) . . . . . . . . . . . . . . . . . . . . .104

F116 – Display Brightness Level . . . . . . . . . . . . . . . . . . . . . . . . . . .106

F117 – Factory Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107

F118 – Option Board Configuration . . . . . . . . . . . . . . . . . . . . . . . . .108

F119 – GPS Receiver Configuration . . . . . . . . . . . . . . . . . . . . . . . .110

F120 - N.1 Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . .114

F123 – Have Quick Input/1 PPS Sync Configuration . . . . . . . . . . . . 114

F126 – Options Key Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115

F128 – Have Quick Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115

F130 - Precision Time Protocol Status . . . . . . . . . . . . . . . . . . . . . . . 116

F131 - Precision Time Protocol Network Config . . . . . . . . . . . . . . . 119

Option bay location of the IEEE 1588 cards . . . . . . . . . . . . . . . . 119

Static IP address, subnet mask and default gateway for the network port 119

DHCP enabled/disabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .120

DHCP-assigned IP address, subnet mask and default gateway for the network port 120

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PTP Sync message interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

PTP burst mode enabled/disabled . . . . . . . . . . . . . . . . . . . . . . . 121

PTP network port enabled/disabled . . . . . . . . . . . . . . . . . . . . . . 121

PTP subdomain same . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Reset PTP settings to factory defaults . . . . . . . . . . . . . . . . . . . . 121

PTP initialize to user entered values . . . . . . . . . . . . . . . . . . . . . 121

PTP Master or Slave (PRI/SEC/STBY) . . . . . . . . . . . . . . . . . . . 122

PTP Slave Synchronization Threshold . . . . . . . . . . . . . . . . . . . . 122

PTP Preferred Master Configuration . . . . . . . . . . . . . . . . . . . . . 122

Request a summary of the PTP card configuration . . . . . . . . . . 125

Set Internet Configuration settings . . . . . . . . . . . . . . . . . . . . . . . 125

Set the IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Set the Subnet Mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Set the Default Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

Setting the Internet Configuration . . . . . . . . . . . . . . . . . . . . . . . . 128

Enable/Disable DHCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Get PTP Protocol settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Request the PTP Subdomain Name . . . . . . . . . . . . . . . . . . . . . 130

Set the PTP Subdomain Name . . . . . . . . . . . . . . . . . . . . . . . . . 130

Reset the PTP Parameters to the Factory Default settings . . . . 131

Initialize the PTP Protocol to User-entered Values . . . . . . . . . . 131

Configuring the PTP Reference Clock Settings . . . . . . . . . . . . . 132

Request the PTP Slave Synchronization Threshold . . . . . . . . . 133

Set the PTP Slave Synchronization Threshold . . . . . . . . . . . . . 133

Request the PTP Preferred Master Clock Configuration . . . . . . 134

Enable or Disable the PTP Preferred Master Clock Configuration 134 F131 B<N> S<CR> REQUEST PTP NETWORK PARAMETERS STATUS 134

9: XLi-Generated Messages 137

Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Informational Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

A: Using F100 Configuration 141

Configuring SNMP Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Overview of Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Set up the FTP Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Get the IP Address of the FTP Server/Workstation . . . . . . . . . . 141

Copy the Configuration Files to the FTP Server . . . . . . . . . . . . . 142

Edit the Configuration Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

Move the Configuration Files Back to the XLi . . . . . . . . . . . . . . 143

B: Upgrading System Firmware 145

Overview of Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

Set up the FTP Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

Open a Command Line Session on the XLi . . . . . . . . . . . . . . . . 145

Upgrade the Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

FAQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

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C: SNMP 151

SymmetricomTtm-SMIv2.mib . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .151

xliMainCard-SMIv2.mib . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .161

xli-SMIv2.mib . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165

xliSystem-SMIv2.mib . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165

Editing snmp.conf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .176

SNMP Private Enterprise MIB Structure . . . . . . . . . . . . . . . . . . . . .177

SNMP Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .177

New Top Level Structure of Enterprise MIB for XLi . . . . . . . . . . .177

XLi System Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .179

The XLi Fault Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180

The XLi System Status Group . . . . . . . . . . . . . . . . . . . . . . . .181

XLi MainCard Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182

XLi Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182

Future Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182

Glossary of SNMP-Related Terms . . . . . . . . . . . . . . . . . . . . . . . .183

Configuring and Testing SNMP . . . . . . . . . . . . . . . . . . . . . . . . . . . .184

Materials Needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .184

HP OpenView Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . .184

XLi Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186

Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186

E: Time Code Formats 189

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .189

IRIG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .189

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .189

IRIG Code Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .189

IRIG-B Time Quality Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190

Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190

Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190

NASA 36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190

NASA 36 Code Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191

Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191

Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191

F: World Map of Time Zones: 193 G: Part Numbers 195 H: Sales and Customer Assistance 197 Glossary of IEEE 1588-related Terms 199 Index 201

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viii XLi IEEE 1588 Clock

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1: Overview and Features

Overview

Description

The standard XLi IEEE 1588 Clock, also referred to as the “XLi”, provides a complete implement ation of a Precise Time Protocol (PTP) “ordinary clock” over a dedicated IEEE 1588 card. The IEEE 1588 card can be configured to operate as a PTP grandmaster or as a PTP slave.

As a PTP grandmaster, the IEEE 1588 card typically synchronizes PTP slaves on the network to International Atomic Time (TAI). The XLi IEEE 1588 Clock derives TAI from the Global Positioning System (GPS). In addition, Symmetricom designed the XLi IEEE 1588 Clock so the user can distribute Coordinated Universal Time (UTC) or user-entered time over PTP.

As a PTP slave, the IEEE card automatically discovers a PTP master within its subnet/subdomain and synchronizes to it. The PTP slave in turn, can be configured as the primary reference source for the XLi IEEE 1588 Clock (the clock synchronizes to the PTP slave).

The XLi’s Time Interval/Event Time (TIET) feature can be used to measure PTP synchronization across timing networks. For example, to measure a PTP slave’s synchronization to the PTP grandmaster, the user connects the PPS output of a PTP slave to the XLi IEEE 1588 Clock and configures F110 to display the time interval between each PPS.

See F130 - Precision Time Protocol Status

Config (page 119) for more information.

Standard Configuration

(page 116) and F131 - Precision Time Protocol Network

The XLi IEEE 1588 Clock can be purchased in two configurations. The first configuration includes one IEEE 1588 card preconfigured as a PTP master and located in Option Bay 4. The second configuration has an additional IEEE 1588 card preconfigured as a PTP slave located in Option Bay 2. Both configurations include the following items.

• XLi chassis and CPU card running special firmware

• The IEEE 1588 card(s)

• GPS C/A Receiver (87-8028-2)

• L1 GPS Antenna

• GPS antenna cable: 50 ft. (15.24 m) of RG-59

• Time Interval Event Time (TIET)

• Standard 110 VAC Power Supply

• Standard TCVCXO Oscillator

1. Other GPS antenna cable lengths can be specified at the time of purchase.

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Only the features listed above are supported for the XLi IEEE 1588 clock. At the time of this writing, none of the other options for the XLi Time and Frequency system are supported on the XLi IEEE 1588 clock. Contact Symmetricom Sales to obtain a special supported configuration of the XLi IEEE 1588 clock. For contact information, please see Sales and Customer Assistance (page 197).

1588-Related Specifications

The specifications in this section cover options included as standard features in the XLi IEEE 1588 Clock. See also “2: System Specifications” on page 9.

IEEE 1588 card

IEEE 1588 Subsystem

Compliance: IEEE 1588-2002 While operating as Grandmaster:

• Time stamp accuracy is equivalent to XLi clock accuracy: Please consult the datasheet online.

• Sync Intervals: 1, 2, 8, 16, and 64 seconds

• Packet throughput: >100 Delay_Req/second

• Delay_Req buffer: 256 time stamps

While operating as a Slave:

• Sync accuracy to master via crossover cable: Please consult datasheet online.

• Sync Interval: 2 seconds

Physical

Size: One option bay (1.9 cm h x 10.5 cm w x 17.4 d) Connectors: One network port (RJ-45), labelled “1588”

One PPS output (BNC), labelled “SYNC OUT”

LEDs See “LEDs”, page 4.

1. http://www.symmttm.com/pdf/gps/DS_XLi1588.pdf

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Network Port (“1588”)

A IEEE1588-compliant “ordinary clock” is available from a stand-alone Ethernet port, labelled “1588”, on the rear panel of the IEEE 1588 card.

Type: Standard RJ-45 8-pin connector, 100 Base-T Qty: 1 Packet type

Protocols

Ethernet DIX II (RFC 894) IPV4, IEEE1588, 802.3, ARP, and PING

PPS Output (“SYNC OUT”)

A raw unfiltered PPS output is available from the stand-alone BNC connector, labelled “SYNC OUT”, on the rear panel of the IEEE 1588 card.

The PPS Output from the IEEE 1588 card while configured as a PTP master:

• 50% duty-cycle, +/-10% typical

• Please consult the datasheet online for additional specifications.

Behavior

The IEEE 1588 card can function as:

• PTP Grandmaster

- Best Master

- Preferred Master

• PTP Slave

- Primary Reference

- Secondary Reference

- Standby

User Interface

All of the IEEE 1588 card’s functions can be managed using the Web Interface (page 31), Command Line Interface (page 29), or Keypad/Display Interface (page 25).

The following 1588-related functions are available from the command and keypad/display interfaces:

• F130 - Precision Time Protocol Status

• F131 - Precision Time Protocol Network Config

1. http://www.symmttm.com/pdf/gps/DS_XLi1588.pdf

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(page 116)

(page 119)

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LEDs

The following LEDs are available on the IEEE 1588 card rear panel:

• Network Port (1588), Green and Amber LEDs illuminate when receiving or transmitting network traffic.

• PPS: LED illuminates (green) while the SYNC OUT signal is high. See “PPS Output (“SYNC OUT”)” on page 3.

• TX: LED illuminates (green) with transmission of a PTP packet.

• RX: LED illuminates (green) with arrival of a PTP packet.

• M/S: 1588 port operating as PTP master or slave:

- Green: PTP master.

- Amber: PTP slave.

ENA: Indicates the state of the 1588 port whether the 1588 software is running:

• Green: 1588 port is enabled, and the 1588 software is running.

• Amber: 1588 port is disabled, and the 1588 software is running.

• Red: The state of the 1588 port is unknown, and the 1588 software is not running.

See “F131 - Precision Time Protocol Network Config” on page 119.

GPS C/A Receiver (87-8028-2)

Introduction

The GPS C/A Receiver acts as a S tratum 0 timing reference source to the XLi. It tr acks up to 12 L1 GPS satellites, decodes their signals for time and position, and feeds this data to the XLi through the internal backplane. When available and enabled, the GPS C/A Receiver card provides superior time and frequency accuracy on the XLi (See “ Receiver card comes with an L1 GPS antenna, cabling, and mounting hardware unless otherwise specified at the time of purchase.

The GPS C/A Receiver uses a TRAIM (Time Receiver Autonomous Integrity Monitoring) algorithm to monitor the integrity of the receiver’s timing solution. Using redundant measurements, TRAIM detects and quarantines anomalous GPS signals, independent of the GPS health ephemeris data. The quarantined signal is excluded from the timing solution for 12 hours before it is requalified for inclusion in the timing solution.

See “

Installing the GPS Antenna” on page 15 for information on selecting an antenna site, mounting the

antenna, and signal strength requirements. The GPS C/A Receiver card can be managed and configured using F53 – GPS Operation

Mode (page 58) and F119 – GPS Receiver Configuration (page 110).

System Time & Frequency Accuracy” on page 10). The GPS C/A

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Specifications

Frequency 1575.42 MHz (L1 signal) Code Coarse Acquisition (C/A) code Tracking Up to 12 satellites with TRAIM Position Accuracy Typically < 10m when tracking four (4) satellites TRAIM Mask 1 μS 1 PPS Accuracy UTC-USNO ±30 ns RMS 100 ns Peak Time standard: UTC or GPS Antenna input Female BNC Antenna Power 20 mA – 220 mA, +12 V

Related topics:

Installing the GPS Antenna” on page 15

• “

• “F50 – GPS Receiver LLA/XYZ Position” on page 53

• “F51 – GPS Antenna Cable Delay” on page 55

• “F53 – GPS Operation Mode” on page 58

• “F60 – GPS Receiver Satellite List” on page 60

• “F69 – Time Mode” on page 65

• “F73 – Alarm Control / Status” on page 69

• “F74 – Clock Source Control” on page 77

• “F119 – GPS Receiver Configuration” on page 110

Standard TCVCXO Oscillator

Frequency/Timing Allan Deviation, Stability

Temp Drift Rate

-9

1 x 10 2 x 10 3 x 10

5x10 5 x 10

@ 1 sec

-10

@ 1K sec

-12

@ 1 day

-7

, over 0°C to 50°C when not locked to a reference

-9

/ Day

The XLi comes with the standard TCVCXO oscillator described below. The stability of the following oscillators is dependent on the reference source. For reference source accuracies, see “

Frequency Accuracy” on page 10 .

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System Time &

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Standard 110 VAC Power Supply

The XLi’s internal fault detector can monitor the three output voltages from the primary and the secondary power supplies. With the Primary Power or Secondary Power indicators in F73 enabled, a 10% decrease in any of the output voltages triggers an alarm. See “

page 69.

Warning: Ensure that a disconnect device, such as a switch, with the appropriate volt age/current ra ting, is provided when operating/installing the XLi.

Warning: Prior to servicing the interior of a unit with dual power supplies, remove both power cords.

Input connector: IEC 320 type Input voltage range: Universal, 90 – 260 VAC and 110 – 370 VDC Input frequency range: 47 Hz – 440 Hz Isolation, ground: For 110-370 VDC operation, the input is fully floating. Either

input polarity may be strapped to chassis ground. Isolation: 1,500 VAC, input to ground Output Specifications: +5.2 V (5.0 to 5.4 V), 25 watts, 0 to 5 amps

+12 V (11.4 to 12.6 V), 45 watts, 0 to 3.8 amps

-12 V (–11.4 to –12.6 V) 32 watts, 0 to 2.7 amps

F73 – Alarm Control / Status” on

Fan: Exhaust 3-6CFM

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Clock Architecture

Figures 1 and 2 on the following pages provide a simplified view of the standard XL i's clock a rchitectu re.

16.384 MHz Osc. PLL

Aux Ref

1,5,10 MHz

Phase Measurement

1 PPS A

1PPS B

Code Input

DAC

10 MHz Osc.

1 PPS

Timing

Select

Time and Clock

Recovery

Code Input

Clock DPLL

200 MHz PLL

Phase Compare

Clock Machine

Code Generation

1 PPS

Output

Code Out

1 PPS Out

Code Out

Figure 1: Functional Timing Block Diagram

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Rate Gen

Rate Out

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Display Rb Power

Display/Keypad Interf ace

I/O

Power Supply AC

+5 V, +/- 12 V

110/220 AC

Keypad Oscillator

Backplane Interface

Power

Power Supply

DC +5 V, +/- 12 V

9-18 VDC 18-36 VDC 36-72 VDC

10 MHz

Option

User I/O

I/O

Power

Power, Vc

I/O

T&F CPU

User I/O

Figure 2: Interface Architecture Block Diagram

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2: System Specifications

Mechanical/Environmental

Power: 95-260 VAC, 47 to 440 Hz Operating Temperature: 0 °C to +50 °C (+32 °F to +122 °F) Maximum Rate of Change: 8 °C per hour Storage Temperature: -55 °C to +85 °C (-67 °F to +185 °F) Humidity: To 95% non-condensing Operating Altitude: Maximum 4 km (2.49 mi. or 13147 ft.) Front Panel Display: Vacuum Fluorescent Display (VFD) 4.38” x 0.88" (11.13cm x 2.24 cm). 160X16

pixels. Displays startup messages, clock status, time and day of year, and interactive clock functions. TIME mode displays Time and Day of Y ea r (T OD) o n

one full-height line. Keypad: 0–9, UP, DOWN, LEFT, RIGHT, ENTER, CLR, TIME, STATUS, MENU Serial I/O: Full user-selectable RS-232/422 communication protocol up to 19200 baud Vibration Operating: GR-CORE-63, 4.5.2/4, locked to 1.0 g Storage Transport: GR-CORE-63.4.4.1 to 1.5g

AC Power Supply

Input:

Input connector: IEC 320 connector

Input voltage range: Universal, 90 – 260 VAC and 110 – 370 VDC Input freq. range: 47 Hz – 440 Hz

Output: +5.2 V (5.0 to 5.4 V), 25 watts, 0 to 5 amps

Wattage: 104 watts Power Supply Status: The Fault Detector monitors all three output voltages and provides a visual

Alarm Status LED: Green LED on with no fault and AC power applied. Green LED of f with fault or no

Fan: Exhaust 3-6 CFM

XLi IEEE 1588 Clock 9 997-01510-03, Rev. C, 12/12/2006

+12 V (11.4 to 12.6 V), 45 watts, 0 to 3.8 amps

-12 V (-11.4 to -12.6 V) 32 watts, 0 to 2.7 amps

(panel LED) and fault status if any output voltag e decreases by 10%.

AC power applied.

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System Time & Frequency Accuracy

The tables below describe system clock accuracy while locked to the reference source indicated. Currently, GPS is the only supported reference source.

GPS Receiver

1 PPS Output: ±30 ns RMS, 100 ns peak without SA (99%) Frequency Output Accuracy:

Frequency/Timing, Allan Deviation, Stability:

< 2x 10 1 x 10

2 x 10 1x 10

-12

-9

@ 1 sec

-10

@ 1000 sec

-12

@ 1 day AM Code Output Accuracy: 10 DC Level Shift Code Output

Accuracy: Time to System Lock <20 min. typical

μS to the 1 PPS

200 ns to the 1 PPS

See GPS Signal Strength Requirements (page 17) and GPS C/A Receiver (87-8028-2) (page 4).

Aux Ref Input

If an Aux Ref input is available and enabled, the XLi assumes that Aux Ref is a better frequency source than its own oscillator. If a timing reference is not available (or becomes unavailable) and Aux Ref is enabled, the XLi locks to the Aux Ref input. Under those conditions, frequency output accuracy is equal to the reference < 1 x 10

-12.

Note: To set the time and date manually, see “F3 – Time & Date” on page 40.

Chassis

1U Chassis: Standard 19" EIA Rack System, hardware included

Receiver Size: 1.75 in. x 17.1 in. x 15.35 in. Weight: Standard configuration, without options ~9.25 lb. Fully loaded ~ 10.95 lb

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Standard Inputs and Outputs

The following specifications describe the standard (as opposed to optional) inputs and outputs on the standard configuration of the XLi.

Serial I/O Port

The standard serial data port is a bi-directional EIA standard RS-232C interface. The serial data port is configured via the Keypad / Display and Standard network port.

Interface: RS-232 or RS-422 Data Rates: 1200, 2400, 4800, 9600 and 19200 bps Data Bits: 7 or 8 Parity: even, odd, or none Stop Bits: 1 or 2 Connector: Male 9-pin D subminiature Pin Assignment: 1------N/C

2------Rx (RS-232) 3------Tx (RS-232) 4------N/C 5------GND 6------Rx- (RS-422) 7------Rx+ (RS-422) 8------Tx- (RS-422) 9------Tx+ (RS-422)

Factory settings: 9600, 8, N, 1

Note: Parity - NONE is only available/valid when Data Bits is set to 8.

See “

F4 – Serial Port Configuration” on page 42.

NET – Network Port

The Ethernet port interface has a standard RJ-45 connector that provides IEEE 802.3 frame 10/100 Base-T Ethernet. See “

XLi IEEE 1588 Clock 11 997-01510-03, Rev. C, 12/12/2006

F100 – Network Port Configuration & XLi Firmware” on page 80.

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J1 Input – Time Interval - Event Time

The Time Interval - Event Time (TIET) option measures a 1 PPS or Event input signal on J1 against the XLi derived time. The rising edge of the pulse is measured against XLi time with 5 ns resolution.

Pulse Width 100 ns, min. Active Edge: Rising Amplitude (DC):

Logic Low: < 1.25V and Min. 300mV

Logic Hi: >1.25V and Max 10V Impedance: 100 k Resolution: 5 ns, Single Shot Accuracy

F110 – J1 Input (TIET)” on page 99.

See “

Ω, 50 Ω

Refer to

“System Time & Frequency Accuracy” on page 10

Note: Any stray input capacitance loading will impact TIET measurements Note: Configuring J1 as the input for a time code reference source is not supported.

J2 Output – Rate Out

Rate: 1 PPS, 10 PPS, 100 PPS, 1 kPPS, 10 kPPS, 100 kPPS, 1 MPPS, 5

MPPS, 10 MPPS Duty cycle: 40-60% Amplitude (TTL): TTL Levels into 50 Quantity: 1 Connector: Female BNC

± 10%

Factory setting: 10 MPPS

See “F111 – J2 Output (Rate)” on page 102.

Note: Configuring J2 as a Programmable Pulse Output (PPO) is not supported.

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J3 Input – Auxiliary Reference

Auxiliary Reference (Aux Ref):

Frequency: 1, 5, 10 MHz Amplitude: 1 Vp-p to 10 Vp-p at 1 k Amplitude: 1 Vp-p to 3 Vp-p at 50 Impedance: Configurable 1 k SNR: >20db Quantity: 1 Connector: Female BNC Factory Configuration: Disabled

F113 – J3 Input Configuration (Aux Ref)” on page 104.

See “

Ω or 50 Ω to ground

1 PPS – Pulse Per Second Output

Pulse width: 20 On time edge: Rising Amplitude: TTL Levels into 50 Quantity: 1 Connector: Female BNC

μS ±1 μS

Ω to ground

If a time reference is unavailable, 1 PPS is as stable as the frequency reference (e.g., OCXO, Aux Ref).

CODE – Time Code Output

Format: IRIG-B 000, IRIG-B 120, IRIG-A 003, IRIG-A 133, and NASA 36 Amplitude (AM): 3 Vp-p, into 50 Ratio (AM): 3:1 Amplitude (DC): TTL into 50 Quantity: 1 Connector: Female BNC Phasing: In phase with carrier Factory setting: IRIG-B 120

Many IRIG devices only look at the BCD portion of the IRIG frame. Devices that use IRIG A002, B002 and B122 should be able to synchronize with the XLi’s time code outputs.

XLi IEEE 1588 Clock 13

±10%

Ω ±10%

± 10 μS

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ALARM Output

High Z: Power off High Z: Alarm (enabled alarm fault)

Low Z: Normal (no enabled alarm faults) Drive: Open Collector Max. Voltage: 25 VDC Max. Current: 50 mA Quantity: 1 Connector: Female BNC

Certifications

UL, C-UL: UL 1950/CSA 22.2 950, Sta ndard for Safety, Information Technology

Equipment (ITE) FCC: FCC Part 15, Subpart B CE: 89/336/EEC EMC Directive

73/23/EEC Low Voltage Safety Directive

IEC 60950 Safety of Information Technology Equipment (ITE)

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3: Installation and Set-up

In a nutshell:

• Install the GPS antenna outdoors, run the cable, and connect it to the XLi’s GPS receiver.

• Make the following connections to the XLi (all cables supplied):

- From the network to the NET port (for access to the command line and web interfaces).

- From an AC outlet to the XLi’s AC power supply.

• Configure the network settings of the XLi’s standard network port.

• Configure the network settings of the XLi’s IEEE 1588 network port.

Installing the GPS Antenna

Precise Time Protocol (P TP) grandmasters are typically synchronized to International Atomic T ime (TAI). To accomplish this, the user sets up the GPS antenna, connects it to the GPS receiver in the XLi IEEE 1588 Clock, and configures GPS as its primary reference source. When the XLi IEEE 1588 Clock locks to the GPS reference source, it computes TAI and synchronizes the PTP grandmaster (the IEEE 1588 card). When the PTP grandmaster is synchronized to the XLi IEEE 1588 clock it starts operating, sending out PTP Sync and Follow_Up messages and responding to PTP requests.

Selecting a GPS Antenna Site

Select a site outdoors that...

• Is the highest point available

• Offers a full 360° view horizontally, to within 10° vertically of the horizon

• Is higher than neighboring buildings/obstructions

• Is protected from strong radio frequency (RF) and microwave transmissions

• Is set away from RF-reflective surfaces that cause multipath interference

• Is set 3 ft. (1 m) away from other GPS antennas

• Is within the maximum GPS antenna cable length from the XLi Typically, this site is on the roof of the building. Avoid...

• Mounting the antenna between tall buildings or next to walls and equipment

• Exceeding the maximum cable-lengths specified for a particular cabling arrangement.

• Patching multiple cables together to make a single cable run

• Running the cable through bulkheads and along side high-energy cables

• Crimping or damaging the cable

• Mounting within 15 meters/yards of lightning rods, tower, or structures that attract lightning

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Blocked signals and multipath cancellation significantly increase GPS acquisition time. Multipath cancellation is caused by reflected signals that reach the antenna out of phase with the direct signal. Multipath cancellation and blocked signals are typically caused by vertical reflective objects positioned to the side and above the antenna. To solve these problems, mast mount the antenna at least 1 meter away from and above the reflecting surface.

Verifying the Site

Verify that the length of cable from the GPS antenna site to the XLi does not exceed the maximum GPS antenna lengths recommended to meet the GPS signal strength requirements. When calculating the total antenna cable length, include cable that is needed to meet safety and regulatory requirements, such as lightning arrestors and building code requirements for running coaxial cable from the exterior to the interior of a building.

If possible, test the GPS signal reception of a particular site before mounting the antenna and running the cable indoors. Some sites may turn out to be unsuitable due to interference.

Notes:

• The XLi requires a 12-volt compatible antenna. Antennas not rated for 12 V will be damaged.

• Use a splitter, not a BNC “T” connector, when connecting an antenna to multiple receivers.

• The L1 GPS antenna is designed to operate with up to 150 ft. (45.72 m) of RG-59 coax cable.

•A line amplifier is available for cable runs between 150 - 300 ft. (46 - 91 m) in length (RG-59).

•A down-converter kit is available for cable runs of 1,500 ft. (457.2 m) in length (RG-58).

Mounting the GPS Antenna

Mount the GPS antenna on an antenna mast (recommended) or on the peak of a building. For the mast, use 2-inch (5.08-cm) diameter PVC pipe or conduit that is rigid enough to withstand high winds without flexing. Use guy wires to stabilize masts longer than 10 ft. (3.048 m). Avoid mounting the antenna on a tower, which requires a specialist to maintain.

16 XLi IEEE 1588 Clock

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Figure 3: L1 GPS Antenna - methods for cabling and mounting

GPS Signal Strength Requirements

Refer to Figure 4:The required gain at the GPS receiver’s ANTENNA connector is greater than 20 dB and less than 36 dB. A 150 foot length of RG-59 coax cable of has a loss of 16-21 dB, which meets this requirement. Abide by the minimum input gain requirements if using other cable types. Additionally, if changing the antenna, abide by the 41 dB gain requirement. Other factors, such as radiation, coverage ,

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VSWR, and input impedance also affect system performance. Symmetricom recommends using the standard 12-volt capable antenna and cable provided with the GPS receiver.

Figure 4: GPS Signal Strength Requirements

Connect the GPS antenna cable to the GPS receiver’s ANTENNA connector at the rear of the XLi.

Note: Use a 12-volt capable GPS antenna.

Making Additional Connections and Powering Up

Make the following connections to the XLi (all cables supplied):

1. For access to the web and command line interfaces, connect NET network po rt (on the Main CPU Card, 87-8000) to the LAN using the Cat 5 network cable (supplied).

For local access to the command line interface only, connect the SERIAL I/O port (on the Main CPU Card, 87-8000) to the to the PC’s serial port using a null modem cable.

2. Connect the 1588 network port to the timing network.

3. Connect the AC Power Supply it to a power source. The green STATUS light on the power supply indicates that the XLi is receiving power.

Upon receiving power, the XLi goes through its startup sequence; displaying “BOOTING”, “LOADING”, and “ST ARTING”. After approxima tely 40 seconds, the XLi displays the clock status, and user interfaces (front panel/command line) become available. The IEEE 1588 card requires an additional 2 minutes to complete its startup sequence before it is available from the user interfaces.

Warning: Ensure that a disconnect device, such as a switch, with the appropriate voltage/

current rating is provided when operating/installing the XLi.

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Configuring Network Settings

The following steps are required to make the XLi’s Main CPU card operational on a network. Do this if you plan on using the command line or web interface to manage the XLi over the network.

Using the front panel keypad/display configure the network port settings as follows:

Press Result

ENTER Displays “FUNCTION” 100 Enters 100 as the function number

ENTER Displays Function 100’s first screen: “ ENTER Displays “ 1-9… Enter the unit’s IP Address (e.g., 192.168.0.11 ENTER Displays “ 1-9… Enter the Subnet Mask (e.g., 255.255.255.000) ENTER Displays “ 1-9… Enter the Default Gateway’s IP address (e.g., 192.168.0.1) ENTER Displays “ ENTER Displays “ ENTER (5 times) Displays “ ENTER Saves the new network parameters, and reboots the XLi

IP ADDRESS…”

SUBNET MASK…”

DEFAULT GATEWAY…”

10-100 BASE-T (CURR BW 10) - AUTO” REMOTE LOCKOUT – UNLOCK” (Leave unchanged) SAVE CHANGES – YES”

COMPANY 00-A0-69…”

Configuring the XLi

Enter the XLi’s IP address as the address in a browser and log on to the XLi’ s web interface. The factory set user name is “operator1” and the password is “zeus”. If this XLi was field-upgraded for IEEE 1588 operation, the password may also be “casey”.

• Click the Admin Home link and then the Accounts Admin link. Change the factory set user names and passwords.

• Click the Admin Home link and then the Option Bay # GPS M12 RECEIVER link.

- Verify that the Antenna Cable Delay is correct. For the standard 50 foot (15.24 m) coaxial

cable supplied with the GPS antenna, the Antenna Cable Delay is 60 ns. To compute the correct value for other antenna cable lengths, see “

page 55.

- Leave GPS Operation Mode as “Dynamic” and Time Reference as “Primary”.

• Click the GPS Config & Status link. After approximately 20 minutes of operation, check that GPS Clock Status is locked and GPS Antenna is OK.

- If GPS Antenna is OK and GPS Clock Status is unlocked, click the GPS Satellite List link.

The Tracked Satellite List should list four or more “current” GPS satellites. It may take significantly longer than 20 minutes for four or more “current” GPS satellites to appear if the GPS

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antenna is not in an optimal site or there is a problem with the antenna cable connections. If this delay is unexpected, consider relocating the GPS antenna to a better site or troubleshooting the GPS antenna cable.

• Press the ST ATUS key on the front panel. The display should show “LOCKED GPS PRI” without

an asterisk (“*”). If an asterisk appears, it means that the GPS receiver is currently unlocked from the GPS satellites, this may indicate a problem with GPS satellite visibility or signal strength.

Configuring the IEEE 1588 Card(s)

Two versions of the XLi IEEE 1588 clock are currently available: The first version has:

• An IEEE 1588 card configured as a PTP master in Option Bay 4

• A GPS receiver in Option Bay 1

The second version has:

• An IEEE 1588 card configured as a PTP master in Option Bay 4

• An IEEE 1588 card configured as a PTP slave in Option Bay 2

• A GPS receiver in Option Bay 1

Note: With two IEEE cards, be mindful of the Option Bay number when changing the settings.

PTP Master

Note: The IEEE 1588 card requires 5 minutes from power up to initialize. Until then, the card does not

appear in the user interfaces, or is reported as "NOT AVAILABLE".

Function F131 is available for configuring IEEE 1588 cards. The IEEE 1588 card located in Option Bay 4 is preconfigured as a PTP master, as shown here:

• PTP AVAILABILITY - OPTION BAY 4

• PTP IP ADDRESS (STATIC) - 010.048.000.103

• PTP SUBNET MASK (STATIC) - 255.255.000.000

• PTP DEFAULT GATEWAY (STATIC) - 010.024.000.001

• PTP DHCP - ENABLE

• PTP SYNC INTERVAL - 2 SECONDS

• PTP BURST MODE - DISABLE

• PTP PORT STATE - ENABLE

• PTP SUBDOMAIN NAME - _DFLT

• PTP RESET TO FACTORY DFLT? - NO

• PTP INIT TO USER SETTINGS? - NO

• PTP CLOCK CONFIG, BAY 1 - MASTER

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• SLAVE SYNC THRESHOLD - 5 microsec

• PTP PREFERRED MASTER - DISABLE

Note: When two IEEE 1588 cards are present, use the up/down arrow keys to select the PTP master in

Option Bay 4 before making changes.

Using the familiar keypad display interface, modify the following F131 settings:

• If a DHCP server is not available on the timing network, disable DHCP and set static values for the PTP IP ADDRES, SUBNET MASK, and DEFAULT GATEWAY.

• Configure the following settings on so that the PTP master and PTP slaves match each other:

- PTP SYNC INTERVAL - The rate at which synchronization packets are sent out. The factory

setting, 2 seconds, is the recommended value.

- PTP BURST MODE - Enables quick and accurate synchronization. Generates additional net-

work traffic.

- PTP SUBDOMAIN - Defines the PTP master as a member of a logical timing network.

• (Recommended) Enable PTP PREFERRED MASTER to have P TP slaves on the timing network favor the PTP grandmaster over other potential masters.

IMPORTANT: If one of the PTP slaves on the timing network is a Symmetricom IEEE 1588 card, the interval for all PTP masters and PTP slaves must be set to 2 SECONDS.

PTP Slave

To reconfigure the IEEE 1588 card from being a PTP master to being a PTP slave, complete the following steps:

1. Having logged in to the web interface, from the Admin Homepage, click the link Option Bay 4 IEEE 1588 Master. The new 1588 web page takes approximately 5 seconds to load.

2. Set Clock Configuration to Slave Primary.

3. Try operating with Slave Synchronization Threshold at 5 microseconds. Timing networks with bursty or heavy traffic, routers, or many layers of hubs and switches may nee d the hig her 1000 microsecond setting.

4. Click the Submit Changes button.

5. The front panel display should show "LOCKED PTP PRI" soon after.

The IEEE 1588 card is now operating as a PTP slave and is also functioning as the primary reference source to the PTP master. The GPS receiver, which was previously operating as the primary reference source to the IEEE 1588 clock, is now a STANDBY reference source.

1. After saving changes, if DHCP is enabled and a DHCP server is available, F131 displays the DHCP-assigned settings following the PTP DHCP ENABLE screen.

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Note: The IEEE 1588 card configured as a PTP slave relies on TAI as the time scale of the PTP master.

Distributing non-TAI time over PTP while the PTP slave is a reference source will have a predictable effect on the XLi’s system time.

Note: Later on, when reconfiguring the IEEE 1588 card as a PTP master, use F119 to set the GPS

receiver as the PRIMARY reference source. (In F119: Set GPS TIME REFERENCE, BAY 1 to PRIMARY.)

Note: For XLi IEEE 1588 Clocks with the second IEEE 1588 card in Option Bay 2 (preconfigured a PTP

slave, configure the network settings, PTP SYNC INTERVAL, PTP BURST MODE, and PTP SUBDOMAIN. The factory settings are the same as for the PTP master, except the static IP Address is 010.048.000.105 and Clock Configuration is Slave Primary.

Rack Mounting the XLi

The XLi comes with the following parts needed to mount the XLi securely in any EIA standard 19-inch (48.26-cm) rack:

• 2 mounting brackets

• 4 flat-head, Phillips screws

Have the following items ready and available:

• The appropriate AC source to connect to the XLi’s power supply.

• A #2 size Phillips bit screwdriver

To rack mount the XLi:

• Unscrew the four phillips-head screws from the front end of the side panels.

• Use the same screws to attach the rack mount brackets, as shown.

• Tighten the screws using a #2 size Phillips screwdriver.

• Position the XLi in any EIA Standard 19-inch (48.26 cm) rack system, and line up holes in the brackets with the holes in the rack.

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+ 186 hidden pages

Symmetricom XLi IEEE 1588 Clock User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual