Symmetricom GPS Receiver XL GPS User Manual

XL-GPS Time & Frequency System

User Guide

997-01530-01, Rev. C, January 2008

Download from Www.Somanuals.com. All Manuals Search And Download.

Table of Contents

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Limitation of Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Proprietary Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii

Abut this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii

Finding Answers to Product Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii

_{1: Overview of the XL-GPS Time and Frequency Receiver . . . . . . . . . . . . . . 1}2

Product Description and Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2: System Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Time and Frequency Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

GPS Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

AC Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Standard I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

RS-232/RS-422 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Network Port 10/100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

J1 - Optional TI/ET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

J2 - Rate Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

J2 - Optional Programmable Pulse Out (PPO) . . . . . . . . . . . . . . . . . . . . . . . 6

J3 – Optional Frequency Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1 PPS Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Code Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

GPS Time and Frequency Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Expansion Module (87-8034) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

IRIG Code Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Optional Programmable Pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Optional Alarm Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

NTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Oscillators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Standard TCVCXO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Optional OCXO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Calibration Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Volatility Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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3: Installation/Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Installing the GPS Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Selecting a GPS Antenna Site Outdoors . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Mounting the GPS Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

GPS Signal Strength Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Making Additional Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Connecting the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Configuring the Network Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Configuring the Time Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Using the Command Line Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Connecting to the Serial Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Connecting to the Network Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Installing the Expansion Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Configuring the Expansion Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Verifying Antenna Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Rack Mounting the XL-GPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

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

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

keypad Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

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

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

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

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

Keypad Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

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

5: Function Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Function Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

F1 – Time Zone Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

F2 – 12/24 Hour Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

F3 – Time & Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

F4 – Serial Port Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

F5 – Time-Quality Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

F6 – Keypad Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

F8 – Continuous Time Once-per-Second . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

F9 – Time On Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

F11 – Time Output Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

F13 – Time Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

F18 – Software Version Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

F50 – GPS Receiver LLA/XYZ Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

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F51 – GPS Antenna Cable Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

F52 – Distribution Cable Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

F53 – GPS Operation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

F60 – GPS Receiver Satellite List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

F66 – Daylight Saving Time (DST) Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

F69 – Time Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

F71 – Oscillator Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

F72 – Fault Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

F73 – Alarm Control / Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

F90 – Code Output Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

_{F100 – Network Port Configuration & XL-GPS Firmware . . . . . . . . . . . . . . . . . 74}2

F100 EA – Ethernet Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

F100 IP – IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

F100 SM – Subnet Mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

F100 G – Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

F100 IC – Network Port Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

F100 BASET – 10/100 BASE- T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

_{F100 L/LOCK/UNLOCK – Remote Lockout . . . . . . . . . . . . . . . . . . . . . . . . . 80}1

F100 L – Remote Lockout Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

F100 ST – Self Test Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

F100 BH – Burn Host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

F100 BUB – Burn BootLoader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

F100 BU – Burn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

F100 BF – Burn File System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

F100 BUFP – Burn FPGA Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

F100 CONFIG – Configure NTP & SNMP . . . . . . . . . . . . . . . . . . . . . . . . . . 87

F100 J – Factory Mode Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

F100 K I L L – Reboot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

F100 P – Change User Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

F100 PI – PING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

F100 PN – Change User Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

F108 – Oscillator Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

F110 – J1 Input (TIET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

F111 – J2 Output (Rate, PPO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

F113 – J3 Input (Freq Meas) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

F117 – Factory Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

F119 – GPS Receiver Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

F126 – Options Key Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

6: GPS M12 Receiver (87-8028-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

7: XL-GPS-Generated Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Informational Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

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A: Using F100 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114

Configuring NTP & SNMP Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114

Overview of Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114

Set up the FTP Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114

Get the IP Address of the FTP Server/Workstation . . . . . . . . . . . . . . . . . .114

Copy the Configuration Files to the FTP Server . . . . . . . . . . . . . . . . . . . . .115

Edit the Configuration Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .116

Move the Configuration Files Back to the XL-GPS . . . . . . . . . . . . . . . . . . .116

B: Upgrading System Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .118

Overview of Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .118

Set up the FTP Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .118

Open a Command Line Session on the XL-GPS . . . . . . . . . . . . . . . . . . . .118

Upgrade the Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .121

FAQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122

C: SNMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .124

SNMP Private Enterprise MIB Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .124

SNMP Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .124

New Top Level Structure of Enterprise MIB for XL-GPS . . . . . . . . . . . . . .124

XL-GPS System Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126

The XL-GPS Fault Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .127

The XL-GPS System Status Group . . . . . . . . . . . . . . . . . . . . . . . . . . .128

XL-GPS MainCard Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129

XL-GPS Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129

Future Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129

Glossary of SNMP-Related Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130

Configuring and Testing SNMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .131

HP OpenView Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .131

XL-GPS Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133

Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133

D: Network Time Protocol (NTP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135

Editing ntp.conf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135

Editing MD5 keys on the XL-GPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .136

Editing MD5 keys on the NTP Client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .136

E: Time Code Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138

IRIG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138

IRIG Code Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138

IRIG-B Time Quality Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139

Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139

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F: World Map of Time Zones: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

G: Part Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

H: Sales and Customer Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

US Assistance Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Customer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

EMEA Assistance Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Customer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

_{Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143}2

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

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Preface

Limited Warranty

Each new product manufactured by Symmetricom is warranted for defects in material or workmanship

for a period of one year from date of shipment (“Limited Warranty”). Defects in material or workmanship

found within that period will be replaced or repaired, at Symmetricom’s option, without charge for

material or labor, provided the customer returns the equipment, freight prepaid, to the Symmetricom

factory under this limited warranty. Symmetricom will return the repaired equipment, freight prepaid, to

the customer’s facility. This one year Limited Warranty does not apply to any software or to any product

not manufactured by Symmetricom.

If on-site warranty repair or replacement is required, the customer will be charged the then current field

service rate for portal-to-portal travel time plus actual portal-to-portal travel charges. There is no charge

for on-site warranty repair labor.

Products not manufactured by Symmetricom, but included as integral part of a system (e.g., peripherals,

options), are warranted for 90 days, or longer as provided by the original equipment manufacturer, from

date of shipment.

Aside from the Limited Warranty set forth above, Symmetricom makes no other warranties, express or

implied, of merchantability, fitness for purpose or of any other kind or description whatsoever.

By purchasing any product manufactured by Symmetricom, the buyer consents to and agrees with

Symmetricom that as a result of the exclusion of all warranties, expressed or implied, of merchantability,

fitness for purpose, or otherwise, except for the limited one-year warranty for defects in material and

workmanship for products manufactured by Symmetricom, that the Buyer has the sole responsibility to

assess and bear all losses relating to (1) the ability of the product or products purchased to pass without

objection under the contract description among merchants and buyers in the trade; (2) the conformity of

the product or products to fair average quality within its contract description; (3) the fitness of the product

for the ordinary purposes for which such product is used; (4) the consistency of quality and quantity

within each unit of product or products and among all units involved; (5) the adequacy of containers,

packaging and labeling of the product or products; (6) the conformity of the product, promises or

affirmations of fact (if any) made on its label or container; and (7) the conformity of the product to

standards of quality observed by other merchants in the trade with respect to products of similar

description.

Limitation of Liability

By purchasing any product from Symmetricom, the Buyer consents to and agrees that the Buyer’s sole

and exclusive remedy for any damages or losses incurred by the Buyer as a result of Symmetricom’s

breach of its one-year Limited Warranty for defects in materials and workmanship or otherwise in

connection with any claim respecting the product shall be limited to the repair or replacement of the

product or a refund of the sales price of the product. In no event shall the Buyer be entitled to recover

consequential damages or any other damages of any kind or description whatsoever.

997-01530-01, Rev. C-25, Jan 2008

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Proprietary Notice

This document, whether patentable or non-patentable subject matter, embodies proprietary and

confidential information and is the exclusive property of Symmetricom, Inc. It may not be reproduced,

used or disclosed to others for any purpose except that for which it is purchased or loaned.

Abut this Manual

This manual is subject to change without notice. Symmetricom can not be held responsible for any

errors or inaccuracies in this manual. Please notify the Customer Assistance team of any suggested

improvements or corrections.

Finding Answers to Product Questions

For additional information about the products described in this guide, please contact your Symmetricom

representative or your local sales office. You can also contact us on the web at www.symmetricom.com.

viii

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1: Overview of the XL-GPS Time and Frequency

Receiver

Product Description and Features

The XL-GPS Time and Frequency Receiver is high-precision time and frequency system that generates

_{time and frequency outputs from its GPS-disciplined system clock. When locked to Symm}2_etricom’s

timing-optimized GPS receiver, the XL-GPS provides 1x10^-12frequency output accuracy, and better than

30 nS RMS accuracy to UTC.

Two user interfaces are available for managing the XL-GPS:

•

^{command line interface, available from the serial and network ports (using TELNE}1^T)

•

keypad interface, available on the front panel of the XL-GPS

The standard configuration includes:

•

1U chassis

GPS receiver

Vacuum fluorescent display and a 19-button keypad

1 pulse/sec out (via rear panel BNC)

RS-232 or RS-422 (via rear panel 9P D Male)

Network Port 10/100 Base-T for TELNET and SNMP

Rate Out 1/10/100 PPS, 1/10/100 kPPS, 1/5/10 MPPS (1 output via a rear panel BNC)

IRIG B Time Code Out (AM or DC) (via a rear panel BNC)

Alarm Open Collector (via a rear panel BNC)

90-264 VAC

An optional Expansion Module provides four female BNC connectors that are factory-configurable per

the sales order. The output configurations include:

•

IRIG B AM

IRIG B DC

Alarm

1 PPS

1 kPPS

10 kPPS

100 kPPS

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•

1 MPPS

5 MPPS

10 MPPS

Optional Programmable Pulse

Optional Alarm Relay

In addition, the following software-enabled optional features can be purchased and enabled using a

software key at any time:

•

Network Time Server (NTS)

Programmable Pulse Output (PPO)

Time Interval, Event Time (TI/ET)

Frequency Measurement (FREQ MEAS)

The optional OCXO oscillator upgrade provides enhanced short-term stability while locked to GPS, and

improved holdover ‘flywheeling’ when GPS is unavailable.

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2: System Specifications

Chassis

The chassis is a 19-inch rack-mounted 1U chassis.

Size:

1.75 in. x 17.1 in. x 14. in.

8 lbs

Weight:

Standard Hardware:

Optional Hardware:

Standard 19" EIA rack system

Slide rack hardware

Environmental

Operating Temperature:

Storage Temperature:

Humidity:

0° to +50 °C (+32° to +122 °F)

55° to +85 °C (67° to +185 °F)

95%, non-condensing

Vibration - Operating:

GR-CORE-63, 4.5.2/4, locked to 1.0 g

Vibration - Storage Transport: GR-CORE-63.4.4.1 to 1.5g

Time and Frequency Accuracy

GPS Reference

Time and frequency accuracy/stability while locked to a GPS timing reference:

1 PPS Output

+/-30 nS RMS

< 1 x 10^-12@1 day

Frequency Output Accuracy:

1 x 10^-9@ 1 sec

Frequency/Timing Allan

Deviation Stability:

3 x 10^-10@ 10 sec

3 x 10^-10@ 100 sec

2 x 10^-10@ 1000 sec

1 x 10^-12@ 1 day

AM Code Output Accuracy:

10 μS

DC Level Shift Code Output

Accuracy:

1 μS to the 1 PPS

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AC Power Supply

Input

Input connector

IEC 320 type

Input voltage range

Input frequency range

Universal, 90 - 260 VAC / 110-300 VDC

47 Hz - 63 Hz

Standard I/O

The following specifications apply to the connectors on the Main CPU card.

RS-232/RS-422 Interface

The standard serial data port is a bi-directional EIA standard RS 232C interface. The serial data port is

configurable via the Keypad and Network Port.

Interface:

RS-232, RS-422

Data Rates:

Data Bits:

Parity:

1200, 2400, 4800, 9600 and 19200 bps

7 or 8

even, odd or none for Data Bits 8, even or odd for Data Bits 7

Stop Bits:

1 or 2

Connector:

Pin Assignment:

Male 9 pin D subminiature

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 for RS-232 9600,N,8,1

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Network Port 10/100

The Ethernet port interface is:

Type:

Standard RJ-45 8 pin connector, 10 Base-T and 100 Base-T standards.

IEEE 802.3

Frame format:

J1 - Optional TI/ET

The TI/ET configuration is via the Keypad, Serial I/O, and Network port. J1 accepts an external 1 PPS or

Event input signal and measures it against the system-derived time. The a minimum pulse width of the

input signal is 100 nS. The input impedance is selectable at 100 kΩ or 50 Ω. The rising edge of the pulse

is measured with 5 nS resolution relative to the system clock time.

Pulse width:

Active Edge:

High Level:

Low Level:

Impedance:

Resolution:

Accuracy:

Qty:

100 nS, min.

Rising

Logic Hi >1.25 V < 10V

Logic Low < 1.25 V >0V

100 kΩ or 50 Ω

5 nS, single shot

Refer to “Time and Frequency Accuracy” on page 3

Connector:

BNC female

J2 - Rate Out

The Rate output is default 10 MPPS and configuration is via the Keypad, Serial I/O, and Network port.

Rate:

1 PPS, 10 PPS, 100 PPS, 1 kPPS, 10 kPPS, 100 kPPS, 1 MPPS,

5 MPPS, 10 MPPS

Accuracy:

Duty cycle:

Amplitude (TTL):

Qty:

Refer to “Time and Frequency Accuracy” on page 3

60/40%+/-10%

TTL Levels into 50Ω

Connector:

BNC female

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J2 - Optional Programmable Pulse Out (PPO)

The PPO allows generation of a precisely synchronized trigger pulse at an arbitrary time and with

arbitrary pulse width in integer multiples of 1 μS. The rising edge of the trigger output can be

programmed to occur with 1 us resolution.

Pulse width:

On time edge:

Amplitude:

Programmable in 1 μS steps

Rising

TTL Levels into 50 Ω

J3 – Optional Frequency Measurement

The Frequency Measurement (Freq Meas) option: measures an external frequency applied to the J3

input relative to the XL-GPS’ disciplined frequency.

Frequency:

Resolution

1, 5, 10 MHz

120 x 10-12@ 1 Second Interval

12 x 10-12@ 10 Second Interval

1 x 10-12@ 100 Second Interval

Range

1000 x10-6

Impedance:

Factory Configuration:

Accuracy

1 kΩ, 50 Ω

Disabled

Refer to “Time and Frequency Accuracy” on page 3

1 PPS Out

A time-stable 1 PPS (one pulse per second) output is provided. If no reference is available, the 1 PPS

pulse will be as stable as the internal oscillator.

Pulse width:

On time edge:

Accuracy:

Amplitude:

Qty:

20 μS +/-1 μS

Rising

Refer to “Time and Frequency Accuracy” on page 3

TTL Levels into 50 Ω

Connector:

BNC female

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Code Out

The default output is IRIG-B-120 AM. Configuration is via the Keypad, Serial I/O, and Network port.

Format:

IRIG B-120 1 kHz AM -000 DC

Amplitude (AM):

Ratio (AM):

Amplitude (DC):

Qty:

3 Vp-p, into 50 Ω +/-10%

3:1 +/-10%

TTL into 50 Ω

Connector:

Phasing:

BNC female

In phase with carrier ± 10 μS

Accuracy:

Refer to “Time and Frequency Accuracy” on page 3

Five flags are encoded in the control function segment of the IRIG B code. The first flag encoded at

_{element P5+40ms is the LOCK indicator. It is a binary 1 when the reference source has b}1_ecome

unlocked. The second flag encoded at element P5+60ms is a binary 1 when the worst case time error

exceeds threshold 1 element P5+70ms is a binary 1 when the worst case time error exceeds threshold

2. Element P5+80ms encodes a binary 1 when the error exceeds threshold 3 and P5+90ms when the

error exceeds threshold 4.

The time code resets as follows:

Days Reset:

Leap Year:

Resets to day 1 after day 365

Resets to day 1 after day 366

Alarm

Drive:

Open Collector

25 VDC

50 mA

Max. Voltage:

Max. Current:

Qty:

Connector:

BNC female

The open collector alarm output has the following states:

Off

(High Z) Power off

(High Z) Error, major or minor enabled alarm fault.

(Low Z) Normal, no major or minor enabled alarm faults.

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GPS Time and Frequency Reference

GPS Time and Frequency reference configuration is via the Keypad, Serial I/O, and Network port.

Frequency:

1575.42 MHz (L1 signal).

Coarse Acquisition (C/A) code.

Up to 12 satellites.

Code:

Tracking:

Position Accuracy

1 PPS Accuracy:

Time standard:

Antenna input:

Antenna power:

within 10 meters when tracking four (4) satellites.

UTC(USNO) 30 nanoseconds RMS

UTC

BNC female

+12 VDC

Options

Expansion Module (87-8034)

The expansion module provides four independently-configurable outputs. The outputs are configured

using jumper/switch settings on the Expansion Module. These are configured at the factory per the sales

order, and can also be configured by the user in the field.

The available output types are as follows:

•

IRIG B AM

IRIG B DC

Alarm

1 PPS

1 kPPS

10 kPPS

100 kPPS

1 MPPS

5 MPPS

10 MPPS

Optional Programmable Pulse

Optional Alarm Relay

Connector Quantity and Type: Four female BNC

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IRIG Code Out

Format:

IRIG B-120 1 kHz AM, or IRIG B-000 DC

3.0 Vp-p +/-1V, into 50 Ω

3:1 +/- 10%

Amplitude (AM):

Ratio (AM):

Amplitude (DC):

Phasing:

TTL into 50 Ω

In phase with carrier ± 10 μS

Alarm

Off

(High Z) Power off

Off

(High Z) Error, major or minor enabled alarm fault.

(Low Z) Normal, no major or minor enabled alarm faults.

Drive:

Open Collector

25 VDC

Max. Voltage:

Max. Current:

50 mA

Rates

Rate:

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

Duty cycle:

Amplitude (TTL):

60/40% +/- 10%

TTL Levels into 50 Ω

Optional Programmable Pulse

On time edge:

Amplitude:

Rising

TTL Levels into 50 Ω

Optional Alarm Relay

Connection:

Max Voltage:

Max Current:

Terminal strip, COM, NO, NC

48 VAC/VDC

2 A @ 24 VDC

NTP

The standard network interface of the XL-GPS can be optionally enabled at the factory, or by the user in

the field, to become a Network Time Server (NTS) to client clocks over a network. Time is acquired from

the host clock and distributed over the network using the Network Time Protocol (NTP). Initialization of

the NTS option is done via the Serial I/O port, Network Port, or via the front panel keypad.

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Support for version 3.0 of the NTP, RFC 1305 as well as the Simple Network Time Protocol (SNTP),

RFC1361 is available. In addition, the NTS will respond to TIME protocol requests, RFC868.

The NTS will respond to time synchronization requests from hosts using these User Datagram Protocol/

Internet Protocols (UDP/IP):

NTP ver. 3.0

SNTP

UDP Port 123 - RFC1305 (Transmitted Timestamp Accuracy ±10 µS)

UDP Port 123 - RFC1361

TIME

UDP Port 37 - RFC868

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Oscillators

Standard TCVCXO

< 1 x 10^-12@ 1 day when locked to GPS

Accuracy:

1 x 10^-9@ 1 sec

Frequency/Timing Stability

(Allan Deviation)

3 x 10^-10@ 10 sec

3 x 10^-10@ 100 sec

2 x 10^-10@ 1000 sec

1 x 10^-12@ 1 day

5x10^-7, over 0°C to 50°C when not locked to GPS

Temp

Optional OCXO

< 1 x 10^-12@ 1 day when locked to GPS

Accuracy:

1 x 10^-10@ 1 sec

1 x 10^-10@ 1000 sec

1 x 10^-12@ 1 day

Frequency/Timing Stability

(Allan Deviation)

1 x 10^-8, over 0°C to 50°C when not locked to GPS

5 x 10^-9/ Day

Temp

Drift rate

Certification

UL 60950:2000

C-UL

FCC

CAN/CSA-C22.2 No. 60950-00:2000

FCC Part 15, Subpart B

89/336/EEC EMC Directive

EN55022:1998

EN55024:1998

EN61000-3-2:2000

EN61000-3-3:1995

73/23/EEC Low Voltage Safety Directive

EN 60950-1:2001

IEC

IEC 60950-1:2001 Safety of Information Technology Equipment (ITE)

Calibration Statement

This unit does not contain user-serviceable parts and does not require calibration.

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Volatility Statement

Statement of Volatility for the XL-GPS Model 1530-602.

Memory Size Memory Type Volatile/Non-Volatile User Data IC Location

16 Mb

8 Mb

SRAM

Non-Volatile

Volatile

U25

U39

EEROM

Yes

This document only pertains to the XL-GPS main processor board, the 86-8000.

Default parameters are stored one at a time through the function commands. There is no global clear

command to restore default conditions.

Default conditions are listed in the XL-GPS user manual.

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3: Installation/Configuration

Installing the GPS Antenna

For XL-GPS units include a standard GPS receiver, antenna, and antenna cable. Install as described

below.

Selecting a GPS Antenna Site Outdoors

Select a site 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

Avoid...

•

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

Cable runs from the antenna to the receiver that exceed the specified length

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

For test situations, a GPS antenna can be placed in a window. Equatorial-facing (e.g., south-facing for

users in the northern hemisphere) windows provide the best visibility of satellites. However, if the

equatorial-facing window has large obstructions such as trees or buildings, a window facing another

direction with fewer obstructions may be better. Metal window shades and special metallic window

coatings may block GPS signals entirely.

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.

Mounting the GPS Antenna

Mount the GPS antenna on an antenna mast (recommended) or on the peak of a building. The GPS

antenna kit includes special mounting brackets. For the mast, use 2-inch (5.08-cm) diameter water pipe

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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).

Notes:

•

The XL-GPS requires a 12 Volt-compatible antenna. Antennas not rated for 12 V will be

damaged.

Use an antenna splitter to connect a single antenna to multiple receivers. Don’t use a BNC “T”

connector.

The L1 GPS antenna is designed to operate with up to 150 ft. (60.96 m) of RG-59 coax cable. An

optional Down Converter can be used for cable runs of 1,500 ft. (457.2 m) using RG-58 coaxial

cable.

Figure 1: L1 GPS Antenna - methods for cabling and mounting

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GPS Signal Strength Requirements

Refer to Figure 2:The required gain at the GPS receiver’s ANTENNA connector is greater than 20 dB

and less than 36 dB. A standard 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, VSWR, and input impedance also affect system performance. Symmetricom

recommends using the standard antenna and cable provided with the GPS receiver.

Figure 2: GPS Signal Strength Requirements

Making Additional Connections

Make the following optional connections:

•

ANTENNA: GPS receiver antenna connector with GPS antenna cable. See “GPS Receiver” on

page 133 for more information.

Warning: Use a 12-volt capable GPS antenna.

•

NET: network port with the Cat-5 network cable (supplied) to an Ethernet network. (Needed to

manage the XL-GPS remotely by network, or optionally to distribute NTP time information)

•

SERIAL I/O: with RS-232 null modem cable (supplied) to the serial port on a PC.

For J1, J2, J3, and any other option cards: See also “F110 – J1 Input (TIET)” on page 93, “F111

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– J2 Output (Rate, PPO)” on page 96, “F113 – J3 Input (Freq Meas)” on page 100.

Figure 3: Connectors: ANTENNA, SERIAL I/O, J1, J2, J3, NET, 1 PPS, CODE, ALARM

Connecting the Power Supply

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

current rating is provided when operating/installing the XL-GPS.

Connect the Power Supply it to a power source. The green STATUS light indicates that the XL-GPS is

receiving power.

Notes for optional DC power supplies:

•

Use a 15 amp circuit breaker in series with the DC power source; don’t connect directly to a DC

power source without the breaker.

•

14 gage wire is the minimum recommended for DC power source hookup.

DC Power Supply Only to be used in a restricted access area.

The screw torque range on the Power Terminal Block is 5 to 8 inch pounds.

When connecting to a DC power source, first connect the positive power cable to “+” on the

power supply, then connect the negative power supply cable to “−”.

Upon receiving power, the XL-GPS goes through its startup sequence; displaying “Booting”, Loading”,

and “Starting”. After approximately 40 seconds, the XL-GPS displays the clock status, and user

interfaces (front panel/command line) become available.

Configuring the Network Port

The following additional steps are required to make the XL-GPS operational on a network. Make the XL-

GPS operational on a network if you plan on:

•

Managing the XL-GPS remotely over the network

Distributing timing information from the XL-GPS over the network

Press

ENTER

100

Result

Displays “FUNCTION”

Enters 100 as the function number

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ENTER

1-9…

Displays Function 100’s first screen: “COMPANY 00-A0-69…”

Displays “IP ADDRESS…”

Enter the unit’s IP Address (e.g., 192.168.0.11

Displays “SUBNET MASK…”

ENTER

1-9…

Enter the Subnet Mask (e.g., 255.255.255.000)

Displays “DEFAULT GATEWAY…”

ENTER

1-9…

Enter the Default Gateway’s IP address (e.g., 192.168.0.1)

Displays “10 100 BASE-T – 10”

ENTER

Displays “REMOTE LOCKOUT – UNLOCK” (Leave unchanged)

ENTER (5 times) Displays “SAVE CHANGES – YES”

ENTER

Saves the new network parameters, and reboots the XL-GPS

Notes:

•

To prevent remote network access to the XL-GPS, change Remote Lockout to LOCK. Doing this

shuts down remote access through the XL-GPS’s network port so that the XL-GPS’s functions

are available only through the keypad interface, and through the serial port’s command line

interface.

•

For additional information, consult the relevant topics covering the F100 commands in the XL-

GPS User’s Guide and Reference Manual.

Configuring the Time Display

Configure the XL-GPS to display time correctly. Use the menu-driven keypad interface, to enter the

functions and select the desired settings, as follows:

•

F1 – Time Zone Offset: (“F: World Map of Time Zones:” on page 141) Set the number of hours

difference between your time zone and UTC. For example:

Pacific Standard Time is UTC -08:00

Mountain Standard Time is UTC -07:00

Central Standard Time is UTC -06:00

Eastern Standard Time is UTC -05:00

•

F2 – 12/24-Hour Format: (“F2 – 12/24 Hour Format” on page 35) Select a 12 or 24-hour display

format. By default, the XL-GPS is set to the 24-hour display format (e.g., 6 PM is displayed as

18:00).

F66 – Daylight Saving Time (DST): (“F66 – Daylight Saving Time (DST) Mode” on page 58) If

needed, set when Local time enters and leaves DST.

The factory settings for F66 apply to most users in the continental US: DST begins at 2 am on

the first Sunday of April, and ends at 2 am on the last Sunday of October.

DST is NOT observed in Hawaii, American Samoa, Guam, Puerto Rico, the Virgin Islands,

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the Eastern Time Zone portion of the State of Indiana, and most of Arizona (Navajo Indian

Reservation in observes DST).

Throughout the European Union (EU), Summer Time begins and ends at 1 am UTC. It starts

the last Sunday in March, and ends the last Sunday in October. In the EU, all time zones

change at the same moment.

•

F69 – Time Mode: (“F69 – Time Mode” on page 61) Select the type of time output on the front

panel display, F8, F9, and F90. The four choices are as follows:

UTC (Universal Coordinated Time) differs from GPS Time by the addition of leap-second cor-

rections to compensate for variations in the earth’s rotation.

GPS time is derived directly from the GPS constellation and doesn’t contain any leap-second

adjustments or other GPS-to-UTC corrections.

Standard Time is UTC plus a time zone offset. For example, Pacific Standard Time is UTC

minus 8 hours.

Local Time is UTC with a time zone adjustment and a daylight saving time adjustment.

Using the Command Line Interface

The next two sections show how to connect to the XL-GPS using the serial and network ports. Both

Serial I/O and the network port give the user access to the command line interface. While the keypad

interface provides a simple menu-driven user interface, the command line interface features:

•

Additional functions that aren’t available through the keypad

Remote accessibility over a network through the standard network port

To use the command line interface, refer to the explanations and examples in the ‘Command Line’

subsections for each function in the XL-GPS User’s Guide and Reference Manual.

Connecting to the Serial Port

Complete the following steps to set up and use the Serial Port to communicate with the XL-GPS.

Verify that the XL-GPS’s serial port settings are as follows: (Keypad: ENTER–4–ENTER. Use the UP/

DOWN ARROWs.)

•

Serial Port – RS232

Baud rate – 9600

Data bits – 8

Parity – NONE

Stop bits – 1

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

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Connect a null-modem cable from the PC’s serial port to the XL-GPS’s “SERIAL I/O” port.

If needed, configure your PC’s terminal emulation program to match the serial port settings above (9600,

8, N, 1). Set Flow Control to “None”.

One terminal emulation program, HyperTerminal, is usually found in Microsoft Windows under

Programs – Accessories or Programs – Accessories – Communications.

Initiate a serial port connection between the terminal emulation program and the XL-GPS. (The Serial

Port connection does not require you to log in.)

Once connected, press the Enter key on your keyboard to get a command prompt.

From the command prompt, “>”, you can use the functions described in the “Function Reference” section

of the XL-GPS User’s Guide and Reference Manual. The ‘Command Line’ sub-sections provide

instructions and examples.

_{Troubleshooting Tip: If the terminal emulation software has trouble displaying XL-GPS}1_responses

(looks like the unit doesn’t respond to inputs), add a 1 ms/character delay to the software’s serial port

settings.

Connecting to the Network Port

The network port provides remote access to the XL-GPS’s command line interface. Complete the

following steps to connect to the network port.

Use function F100 – Network Port Configuration & XL-GPS Firmware (page 74), or F100 IP – IP

Address (page 76), to obtain the XL-GPS’s IP address.

Open a telnet session from your PC to the XL-GPS.

In Windows, click Start – Run, enter telnet ###.###.###.###(where the #s are the XL-

GPS’s IP address), and click OK.

Open a telnet session using a program such as HyperTerminal, TeraTerm Pro, or Minicom.

Consult the program’s documentation for instructions.

command prompt.

From the command prompt, “>”, you can use the functions described in the “Function Reference” section

of the XL-GPS User’s Guide and Reference Manual. The ‘Command Line’ sub-sections provide

instructions and examples.

Related topics (Time Error):

•

“F13 – Time Error” on page 48 displays the current time error

“F71 – Oscillator Statistics” on page 62 provides the DAC value

Command Line

To determine if the time quality characters are enabled and what the thresholds are, enter:

F5<CR>

XL-GPS responds:

F5<S><STATE><SEP><FLAG><SEP><FLAG><SEP><FLAG><SEP><FLAG><CR><LF>

where:

= ASCII character F

= function number

<S>

<SEP>

= ASCII space character (one or more)

= one or more separator characters; either space, comma or tab

<STATE> = ENABLE or DISABLE

<FLAG> = one error threshold in nanoseconds, 1 to 11 digits with or without leading zeros

<CR>

<LF>

= carriage return character

= line feed character

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For example, to display the time quality status and flags, enter:

F5<CR>

If F5 is enabled, XL-GPS responds (example):

F5 ENABLE 00000001000 00000010000 00000100000 00001000000<CR><LF>

If F5 is disabled, XL-GPS responds:

F5 DISABLE<CR><LF>

To enable time quality reporting, and change the thresholds of the time quality flags, enter:

F5 ENABLE 2000 20000 200000 2000000<CR>

XL-GPS responds:

OK<CR><LF>

Note: Leading zeros aren’t required when entering new settings. They are displayed in the readouts.

To disable time quality reporting:

F5 DISABLE<CR>

XL-GPS responds:

OK<CR><LF>

F6 – Keypad Lock

F6 – Keypad Lock enables or disables the keypad, preventing accidental changes to the XL-GPS’s

settings. When enabled, the display responds ‘KEYPAD LOCKOUT BY FUNC 6’ when the user attempts

to access any function other than F6. F6 remains available through the keypad at all times. The factory

setting for F6 – Keypad Lock is disabled.

Command Line

To display the Keypad Lock status, send:

F6<CR>

XL-GPS responds:

F6<S><STATE><CR><LF>

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where:

= ASCII character F

= function number

<S>

= ASCII space character (one or more)

<STATE> = ENABLE or DISABLE

<CR>

<LF>

= carriage return character

= line feed character

For example, to display the Keypad Lock status, send:

F6<CR>

XL-GPS responds:

F6 DISABLE<CR><LF>

To enable Keypad Lock, send the following string:

F6 ENABLE<CR>

XL-GPS responds:

OK<CR><LF>

To disable Keypad Lock, send the following string:

F6 DISABLE<CR>

XL-GPS responds:

OK<CR><LF>

F8 – Continuous Time Once-per-Second

Note: This function is available through the command line interface only – it is not available through the

keypad.

F8 generates time-of-year information (e.g., 199:10:41:08) once-per-second over the XL-GPS’s

command line interface, which is available from the standard network port or the serial port. The format

and type of time can be modified using F2, F11, and F69.

If F8 is used following startup, while the XL-GPS is acquiring a reference source, F8’s displays time-of-

year information from the XL-GPS’s unsynchronized system clock. When the system clock acquires a

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reference source and synchronizes with it, F8 displays the new time-of-year information. The transition

looks like this:

365:16:00:14?

365:16:00:15?

365:16:00:16

365:16:00:17

199:13:56:03

199:13:56:04

In the first two lines above, the unsynchronized time is followed by a “?” time quality character. In this

case, the “?” indicates that the XL-GPS is unlocked to a reference source. As the XL-GPS locks to the

reference source, the “?” disappears, and after a couple seconds, the new synchronized time-of-year

information appears.

If the reference source becomes unavailable again, F8 continues generating time-of-year information

based on the synchronized time, and the unlock “?” appears.

199:11:19:31

199:11:19:32

199:11:19:33?

199:11:19:34?

The format of time output can be changed using “F11 – Time Output Format” on page 46. The default

output string format is:

where:

<SOH> = ASCII Start-of-Heading character (e.g., in decimal ASCII code: 001)

<CR> = ASCII Carriage Return character; is output at the 1 PPS mark +/- 1 mS

<LF> = ASCII Line Feed character

DDD

= day-of-year

= hours

= minutes

= seconds

= colon separator.

= time quality character (see the following table)

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The time quality character, “Q”, is one of the following characters:

SPACE = Time error is less than time quality flag 1’s threshold

= Time error has exceeded time quality flag 1’s threshold

= Time error has exceeded time quality flag 2’s threshold

= Time error has exceeded time quality flag 3’s threshold

= Time error has exceeded time quality flag 4’s threshold

A reference source is unavailable

The four time quality thresholds are set by F5 – Time-Quality Setup.

See “F13 – Time Error” on page 48 for more information.

Command Line

For example, to initiate Continuous Time once-per-second, enter

F8<CR>

The XL-GPS replies:

199:11:19:30<CR><LF>

199:11:19:31<CR><LF>

199:11:19:32<CR><LF>

To stop Continuous Time Once-Per-Second, press Ctrl-C on your keyboard to stop it.

F9 – Time On Request

Note: This function is available through the command line interface only – it is not available through the

keypad.

Use function F9 to record the exact time the XL-GPS receives a request from the user.

Enter the command “F9<CR>”to prepare the XL-GPS for the user’s request. At the desired moment,

send the request to the XL-GPS by entering an upper case “T”. The XL-GPS saves the current time-of-

day, accurate to within 1ms, to a buffer, and then outputs it to the command line interface. The XL-GPS

will continue to provide the time-of-day each time it receives a “T” until F9 is cancelled. To cancel this

function, enter Ctrl-C on your keyboard. The command line disregards any input other than SHIFT-T until

it receives a Ctrl-C command.

The time-of-day output is only available on the port, network or serial, that was used to give the F9

command.

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The default output string is as follows:

where:

<SOH> = ASCII Start-of-Heading character

<CR> = ASCII Carriage Return character

<LF> = ASCII Line Feed character

DDD

mmm

= day-of-year.

= hours.

= minutes.

= seconds.

= milliseconds.

= colon separator.

= time quality character (see the following table)

The time quality character, “Q”, is one of the following characters:

SPACE

= Time error is less than time quality flag 1’s threshold

= Time error has exceeded time quality flag 1’s threshold

= Time error has exceeded time quality flag 2’s threshold

= Time error has exceeded time quality flag 3’s threshold

= Time error has exceeded time quality flag 4’s threshold, or a reference source is

unavailable

For example, to prepare Time on Request, enter:

F9<CR>

Then, to request the current time, enter SHIFT-T on your keyboard. (“T” does not appear on the

command line). XL-GPS responds:

To exit F9 press Ctrl-C on your keyboard.

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F11 – Time Output Format

Use function F11 to review or change the format of the time output string used in F8 and F9. The as-

shipped factory setting for F11 format is null, which enables F8’s and F9’s default time output formats.

The default format for F8 – Continuous Time Once-per-Second is:

Note: F8 does not display milliseconds, regardless of the format defined in F11.

The default format for F9 – Time On Request is:

where:

<SOH> = ASCII Start-of-Heading character.

<CR> = ASCII Carriage Return character.

<LF> = ASCII Line Feed character.

DDD

= Day-of-year.

= Hours.

= Minutes.

= Seconds.

= ASCII decimal point.

= Milliseconds.

mmm

= Colon separator.

= Time quality character table below.

The time quality character, “Q”, is one of the following characters:

SPACE = Time error is less than time quality flag 1’s threshold

= Time error has exceeded time quality flag 1’s threshold

= Time error has exceeded time quality flag 2’s threshold

= Time error has exceeded time quality flag 3’s threshold

= Time error has exceeded time quality flag 4’s threshold

A reference source is unavailable

See “F5 – Time-Quality Setup” on page 39 and “F13 – Time Error” on page 48 for more information.

When the unit responds to “F11<CR>” with the current format string (as shown in the following example),

the first character after the “F11” is a blank separator; it is not part of the format string.

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To see the Time Output Format, enter:

F11<CR>

XL-GPS responds:

F11 DDD:HH:MM:SS.mmmQ<CR><LF>

To remove the day, hour, minute, second, microsecond, or a character from the time output format (other

^{than the ASCII <SOH> <CR> or <LF> characters), enter the following string replacing the}2^{character you}

want to remove with an “X”:

F11<SEP>DDD:HH:MM:SS.mmmQ<CR>

F11 does not control the <SOH>, <CR>, or <LF> in the F8 and F9 output strings. <SEP> is only one

character wide, either a space, comma or tab. Any character other than an upper case “X” in a numeric

position does not affect the output of that position. The colons (:) or decimal point (.), however, may be

replaced with any single ASCII character except null (Hex 00), carriage return, or line feed.

For example, to check the current F11 settings, enter:

F11<CR>

XL-GPS replies:

F11 DDD:HH:MM:SS.mmmQ<CR><LF>

Then apply a new time output format by entering, for example:

F11 XXXXXXXMMMSSS.mmmX<CR>

XL-GPS responds:

OK<CR><LF>

With the above settings, F8 displays:

With the above settings, F9 displays:

The new time format above suppresses the days, the first colon, and hours. It replaces the second and

third colons with “M” and “S”, respectively. And it suppresses the time quality character.

If you end the first part of a format string early with a carriage return, the remaining un-typed characters

are enabled and assume their default values. For example, if you enter:

F11<TAB>XXX|<CR>

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XL-GPS responds:

OK<CR>

With the above settings, F8 displays:

With the above settings, F9 displays:

The new time format above suppresses days, and replaces the first colon (:) separator with a vertical

bar. This enables the remaining characters, which assume their default values.

F13 – Time Error

Use function F13 to request the estimated worst-case time error due to oscillator drift during periods of

unlock from a reference source. See “Time and Frequency Accuracy” on page 3 for more information on

time error for different reference sources. Time error begins to accumulate when the receiver loses lock

to a reference source. The XL-GPS calculates the worst-case time error based on the stability of system

clock’s oscillator type, and the time elapsed since loss of lock.

Command Line

The Command line interface will report time error when it receives the following string:

F13<CR>

XL-GPS responds:

F13<S><ERROR><CR><LF>

where:

F13

<S>

= ASCII string for function F13

= ASCII space character

<ERROR> = calculated worst-case error in seconds

<CR>

<LF>

= carriage return character

= line feed

For example, to display the time error, enter:

F13<CR>

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XL-GPS responds (example):

F13 TIME ERROR -0.002932863<CR><LF>

F18 – Software Version Request

Use function F18 to display the current firmware version numbers of the firmware in the XL-GPS:

•

Bootloader

Software (firmware)

File System

Project Rev #

FPGA

Command Line

Use Command Line Function F18 to obtain the system’s firmware version information.For example,

enter:

F18<CR>

XL-GPS responds:

F18 BOOTLOADER 192-8000

SOFTWARE

192-8001

FILE SYSTEM 192-8002v1.80

PROJ REV # 1.80

FPGA #

184-8000V50

F50 – GPS Receiver LLA/XYZ Position

Use function F50 to display the current GPS position. Specifically, Use function F50 to:

•

Select the positional coordinate system, Latitude Longitude Altitude (LLA) or XYZ (Earth-

Centered, Earth-Fixed XYZ coordinates based on WGS 84).

If LLA is selected, Altitude Mode shows the elevation in meters (WGS 84).

Warning: This GPS receiver is optimized for timing versus position accuracy. Therefore,

position information on this unit is not valid for navigation and other critical

applications.

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Keypad

When Position Mode is “LLA”, the position of the antenna is displayed in degrees, minutes, and seconds

using the following format:

<SIGN><DEG><°><MIN>'<SEC>"

where:

<SIGN> = N or S for latitude; E or W for longitude; – for negative altitude and <S> or + for positive altitude.

<DEG>

<MIN>

= two-digit degrees for latitude or three-digit degrees for longitude.

= two-digit minutes.

= ASCII character '

<SEC>

= two-digit seconds plus one-digit 10ths of seconds.

= ASCII character "

For example:

LATITUDE

N38°23’53.2”

LONGITUDE

W122°42’53.0”

Altitude Mode is available in Meters only.

Altitude is displayed in meters above (“+”) or below (“-”) the WGS 84 ellipsoid.

Command Line

Use the following format to display the current settings display the current position for the GPS receiver

in LLA coordinates:

F50<S>LLA<CR>

XL-GPS responds with the coordinate information in the following format:

F50<S><SIGN><S><DEG>d<MIN>'<SEC>"<S><SIGN><S><DEG>d<MIN>'<SEC>"<S><ALT><UNITS><CR><LF

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where:

F50

= Function 50

<S>

= ASCII space character one or more.

= Separator

<SEP>

LLA

= LLA mode

<CR>

<SIGN>

<DEG>

= carriage return character.

^{= N or S for latitude; E or W for longitude; – for negative altitude and <S> or + for pos}2^{itive altitude.}

= two-digit degrees for latitude or three-digit degrees for longitude.

= ASCII character d

<MIN>

= two-digit minutes.

= ASCII character '

<SEC>

= two-digit seconds + 1 digit 10ths of seconds.

= ASCII character "

<ALT>

= altitude in meters

<UNITS> = unit of altitude, “m” for meters

<LF> = line feed character.

For example, to display the LLA coordinates of the antenna, enter:

F50 LLA<CR>

XL-GPS responds (example):

F50 N 38d23'51.3" W 122d42'53.2" 58m<CR><LF>

To display the present antenna position using ECEF XYZ coordinates in meters, use the following

format:

F50<S>XYZ<CR>

XL-GPS responds using the following format:

F50<S><SIGN><S><MX>m<S><SIGN><S><MY>m<S><SIGN><MZ>m<CR><LF>

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where:

= ASCII character F

= function number

<S>

= ASCII space character

<SIGN> = Either + or - for the position of the ECEF XYZ coordinates

<MX>

<MY>

<MZ>

= Antenna X-position in meters to tenths of a meter

= Antenna Y-position in meters to tenths of a meter

= Antenna Z-position in meters to tenths of a meter

= ASCII character m for Meters

<ALT> = altitude in meters

<CR>

<LF>

= carriage return character

= line feed character

For example:

F50 XYZ<CR>

XL-GPS responds (example):

F50 X –4474331m Y 2668899m Z –3668099m<CR><LF>

F51 – GPS Antenna Cable Delay

Use function F51 to display or configure the GPS antenna cable delay. Setting a positive value for F51

compensates for the time the signal takes to travel the length of the cable from the GPS antenna to the

receiver. The factory setting for F51 is +60 nS (50 feet of RG-59). If using an optional Down/Up

Converter, consult that product’s documentation for directions on setting the correct cable delay.

F51 Guidelines:

•

For RG-59: multiply the cable length by 1.24 ns/ft. to get the value for F51.

For RG-58: multiply the cable length by 1.4 ns/ft. to get the value for F51.

Don’t use function F51 to adjust the XL-GPS’s timing outputs; use F52 Distribution Cable Delay

instead.

Command Line

Use the following format to display the current Antenna Cable Delay setting:

F51<CR>

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The XL-GPS responds using the following format:

F51<S><+><DELAY>ns<CR><LF>

where:

= ASCII character F (f or F for input string).

= the function number.

<S>

<CR>

<SEP>

= ASCII space character one or more.

= carriage return character.

= one or more space characters.

<DELAY> = 1 to 6 digit delay from 0 nS to 999999 nS.

= nanoseconds (ns or NS for input string).

= line feed character.

<LF>

Note: Only positive delays are valid.

For example, to see the antenna cable delay, enter:

F51<CR>

XL-GPS responds:

F51 +000060ns<CR><LF>

To set the antenna cable delay, use the following format:

F51<S><DELAY>NS<CR>

For example, to set the antenna cable delay to 100 nS, enter:

F51 100NS<CR>

XL-GPS responds:

OK<CR><LF>

F52 – Distribution Cable Delay

Use function F52 to display or set the distribution cable delay for the standard CODE (time code) and

1 PPS outputs. F52 compensates for the signal’s travel time from the XL-GPS to its point of use. The

distribution cable delay applies uniformly to all output ports. The as-shipped factory setting is +0 ns. The

range of possible values is +999,999 ns to –999,999 ns. Positive values advance the timing signals,

while negative values retard them.

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To calculate what the setting should be, multiply the delay/foot by the length of the cable in feet. The

typical delays for the following cable types are:

•

RG-58 – approximately 1.4 ns/foot

RG-59 – approximately 1.24 ns/foot

Command Line

To display the current distribution cable delay, enter:

F52<CR>

The XL-GPS responds using the following format:

F52<SEP><SIGN><DELAY>ns<CR><LF>

where:

= ASCII character F (f or F for input string).

= the function number.

<S>

= one or more space characters.

<SIGN> = either + or –

<D>

= 1 to 9 digit delay from +999999 nS to –999999 nS

= nanoseconds (ns or NS for input string)

= carriage return character

<CR>

<LF>

= line feed character

For example, to display the current distribution cable delay, enter:

F52<CR>

XL-GPS responds:

F52 +000000ns<CR><LF>

To set the distribution cable delay to 60 nS, enter:

F52 +000060nS<CR>

XL-GPS responds:

OK<CR><LF>

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F53 – GPS Operation Mode

Use function F53 to set the GPS M12 Receiver in Time Mode or Dynamic Mode.

Select “Dynamic Mode” if the position of the receiver is subject to frequent change, or if it is in

continuous motion. For example, use Dynamic Mode when the XL-GPS is used in mobile vehicles such

as ships, land vehicles, or aircraft. With Dynamic Mode selected, the receiver updates the position

information repeatedly to arrive at the best time calculations for a mobile environment.

Select “Time Mode” if the receiver used in a static environment such as a server room. With Time Mode,

_{the receiver averages the position data over time to determine the antenna position and c}2_{alculate the}

time precisely and accurately.

Keypad

While viewing the Status screen on the XL-GPS front panel display, press the following keypad buttons:

ENTER 53 ENTER

If a GPS M12 Receiver is not available, F53 displays:

GPS M12 AVAILABILITY

NOT AVAILABLE

Note: If F53 indicates that M12 is not available, reset M12. If availability is still an issue, call customer

service.

If a GPS M12 Receiver is available, F53 displays:

GPS MODE SELECT

TIME MODE (or DYNAMIC MODE)

_{To change the mode, use the UP/DOWN ARROW buttons and press ENTER. F53 asks:}5

SAVE CHANGES?

YES

To save changes, press ENTER.

Command Line

To request the GPS operation mode of an GPS M12 Receiver (87-8028-2), enter:

F53<CR>

F53 responds using the following format:

F53<SP><SEP><STATUS><CR><LF>

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where:

= ASCII character F (f or F for input string).

= the function number.

<SP>

<SEP>

= ASCII space character one or more.

= one or more space characters.

<STATUS> = DYNAMIC MODE or TIME MODE

<CR>

<LF>

= carriage return character.

= line feed character.

For example, enter:

F53<CR>

Example response:

F53 TIME MODE (or DYNAMIC MODE)<CR><LF>

To set the GPS Operation Mode, enter a command using the following format:

F53<SP><MODE><CR>

where <MODE> equals “DYNAMIC MODE” or “TIME MODE”.

For example, enter:

F53 TIME MODE<CR>

Or:

F53 DYNAMIC MODE<CR>

F53 responds:

OK<CR><LF>

F60 – GPS Receiver Satellite List

Use function F60 to display the identification number and signal strength of tracked or current satellites.

‘Tracked’ means a satellite’s signal is being received and interpreted by the receiver (or that the XL-GPS

has GPS data that suggests this satellite should be visible to the antenna).

GPS satellite are grouped into the following categories:

•

Tracked: the XL-GPS is receiving the GPS signal, but isn’t using it to calculate time and position.

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•

Current: the XL-GPS is using the satellite’s GPS signal to calculate time and position.

Bad: the GPS satellite is transmitting information that it has been removed from service.

•

Rejected: the XL-GPS M12 receiver’s TRAIM feature has detected anomalous signals from this

satellite and has quarantined it from the timing solution for 12 hours.

GPS satellite signal strengths are reported in units of dBW. Signals below -170 dBW (e.g., -171 dBW)

are not usable by the GPS receiver. See “GPS Signal Strength Requirements” on page 15.

If you’re using the keypad interface, use the UP/DOWN ARROWs to scroll through the list of satellites.

Command Line

Use Serial Function F60 to request a list of all, current, and tracked satellites. To display the list, enter a

string using the following format:

F60<S><TYPE><CR>

XL-GPS responds with approximately 32 lines that use the following format:

F60<S>prn<NN><S><STATE> tracked current<LEVEL><CR><LF>

where:

F60

<S>

= ASCII string indicating function F60.

= ASCII space character one or more.

= ASCII letter to denote Option Bay number follows

= Option Bay Number, 1 through 10.

<N>

<SEP>

= One or more separator characters; either space, comma or tab.

<TYPE> = ALL, CURRENT, TRACKED, BAD, or REJECTED.

<CR>

prn

= Carriage return character.

= Pseudo Random Number

<NN>

= 1 through 32 (prn<NN> identifies specific GPS satellites)

<STATE> = Good, Bad, or Unknown

tracked = Either “tracked” or blank

current = Either “current” or blank

<LEVEL> = Satellite signal strength in dBW

<LF>

= Line feed character

For example, to display the complete GPS satellite list, enter:

F60 ALL<CR>

F60 responds:

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F60 prn1 good current -159dBW

F60 prn2 good current -162dBW

F60 prn3 good current -163dBW

F60 prn4 unknown

F60 prn5 unknown

F60 prn6 unknown

F60 prn7 unknown

F60 prn8 good current -161dBW

F60 prn9 unknown

F60 prn10 unknown

F60 prn11 unknown

F60 prn12 unknown

F60 prn13 good current -159dBW

F60 prn14 unknown

F60 prn15 unknown

F60 prn16 unknown

F60 prn17 unknown

F60 prn18 unknown

F60 prn19 unknown

F60 prn20 unknown

F60 prn21 unknown

F60 prn22 bad tracked -164dBW

F60 prn23 unknown

F60 prn24 unknown

F60 prn25 unknown

F60 prn26 unknown

F60 prn27 rejected tracked -156dBW

F60 prn28 unknown

F60 prn29 unknown

F60 prn30 unknown

F60 prn31 unknown

F60 prn32 unknown

Similarly, to display a list of the current, tracked, bad or rejected satellites, enter:

F60 CURRENT<CR>

F60 TRACKED<CR>

F66 – Daylight Saving Time (DST) Mode

Use function F66 to enable or disable Daylight Saving Time (DST), and to schedule when Local time

enters and leaves DST. The factory setting for F66 is Manual (i.e., DST On). The hour for entering/

leaving DST is given in the 24-hour format. Entering/leaving DST can be scheduled for any hour of the

day, any day of the year. However, transitions scheduled within 24 hours of the beginning/end of the year

may not occur at the desired time. This function also works for locations in the southern hemisphere,

where DST spans the new year.

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Command Line

To display the current status of F66, enter a command using the following format:

F66<CR>

F66 responds using the following format:

F66<S><STATE><ENTER/EXIT><CR>

where:

= ASCII character F

= function number

<S>

= ASCII space character one or more.

= Off or Manual.

<STATE>

_{<ENTER/EXIT> = If <STATE> is Manual, <ENTER/EXIT> are the dates it enters and exits DST}1_.

<CR>

<LF>

= carriage return character.

= line feed character.

For example, to disable DST, enter:

F66 Off<CR>

F66 responds:

OK<CR><LF>

To enable DST and set the DST entry and exit times, use the following format:

F66 MANUAL<INHOUR><SEP><INWEEK><SEP><INDAY><SEP><INMONTH><SEP><OUTHOUR>

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where:

<SEP>

= time to enter DST in 24-hour format.

= one or more separator characters, either space comma or tab characters. For output strings

this will be a single space character.

<INDAY>

= which week to enter DST, 1, 2, 3, 4 or 0 (for last).

= day of week to enter DST, 1 through 7 where Sunday is 1.

<INMONTH> = month to enter DST, 1 through 12 where 1 is January.

<OUTHOUR> = hour to exit DST, in 24 hour format.

<OUTWEEK> = which week to exit DST, 1, 2, 3, 4 or 0 (for last).

= day in to exit DST, 1 through 7 where Sunday is 1.

<OUTMONTH> = month to exit DST, 1 through 12 where 1 is January

<CR>

<LF>

= carriage return character.

= line feed character.

For example, enter:

F66 MANUAL 02 1 1 04 02 0 1 10

Meaning:

•

Manual settings are in effect.

The entry time is 02 a.m., week 1 (first), day 1 (Sunday), month 4 (April)

The exit time is 02 a.m., week 0 (last), day 1 (Sunday), month 10 (October).

To leave the value of any item unchanged, insert a semicolon in its place. For example, to change the

week DST begins, enter:

F66 MANUAL ; 0 ; ; ; ; ; ;<CR>

F66 responds to all changes with:

OK<CR><LF>

Meaning that Local time will enter DST on the last week of the month. All other parameters remain

unchanged.

The XL-GPS automatically reboots when the user changes the DST entry/exit times in F66.

If any of the items in an input string are invalid, an error message will be returned.

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F69 – Time Mode

Use function F69 to select the time type displayed by:

•

The XL-GPS’s front panel display

“F8 – Continuous Time Once-per-Second” on page 42

“F9 – Time On Request” on page 44

“F90 – Code Output Configuration” on page 72

Select between the following types of time:

•

UTC (Universal Coordinated Time) differs from GPS Time by the addition of leap-second

corrections to compensate for variations in the earth’s rotation.

GPS Time is derived directly from the GPS constellation and doesn’t contain any leap-second

adjustments or other GPS-to-UTC corrections.

Standard Time is UTC plus a time zone adjustment. For example, Pacific Standard Time is UTC

minus 8 hours

Local Time is UTC plus a time zone and a daylight saving time adjustment.

The factory setting is UTC. Local Time modifies UTC time to include the Time Zone and Daylight Saving

Time adjustments, if enabled by the user.

Related functions:

•

“F1 – Time Zone Offset” on page 34

“F66 – Daylight Saving Time (DST) Mode” on page 58

Command Line

Use the following format to display the time mode currently used:

F69<CR>

F69 responds using the following format:

F69<S><TT><CR><LF>

where:

F69

<S>

= Function number 69

= ASCII space character.

<TT> = Time Type. Either GPS, UTC, LOCAL, or STANDARD.

<CR> = Carriage return character.

<LF> = Line feed character.

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For example, enter:

F69<CR>

XL-GPS gives one of the following responses:

F69 GPS <CR><LF>

F69 UTC <CR><LF>

F69 LOCAL <CR><LF>

F69 STANDARD <CR><LF>

To set the time mode, enter a command using the following format:

F69<S><TT><CR>

where:

= ASCII character F.

= Function number.

<S> = ASCII space character.

<TT> = Time Type. Either GPS, UTC, LOCAL, or STANDARD.

<CR> = carriage return character.

<LF> = line feed character.

For example, to change the time mode to local time, enter:

F69 LOCAL<CR>

Or, to change the time mode to UTC, enter:

F69 UTC<CR>

F69 responds to these changes with:

OK<CR><LF>

RESETTING THE UNIT<CR><LF>

PLEASE WAIT...<CR><LF>

F71 – Oscillator Statistics

Use F71 to display the phase, frequency offset, drift rate, and DAC value of an internal or optional

external oscillator.

Definitions:

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The phase is the instantaneous error in seconds between the oscillator and the control loop zero servo

point. The frequency offset is computed using an averaging time that is equal to the effective averaging

time of the oscillator controller. The oscillator Drift Rate is computed using a 24-hour average and is the

daily Drift Rate of the oscillator. The oscillator DAC value is the signed 16-bit integer that controls the

DAC output voltage. It ranges from 0 to 65536.

Command Line

To display the F71 settings, enter:

F71<CR>

F71 responds using the following format:

F71<S>phase=<SIGN><MULT>E<SIGN><EXP><S>s<S><S>offset=<SIGN><MULT>E<SIGN><EXP><S><S>dr

ift=<SIGN><MULT>E<SIGN><EXP>/DAY<S><S>DAC=<SIGN><INT><CR><LF>

where:

= ASCII string indicating function F71

= ASCII space character one or more.

<S>

<MULT> = multiplier, 4 digits with decimal point.

= ASCII character E for exponent.

= ASCII character s for seconds abbreviation

<SIGN> = - for negative or <S> for positive.

<EXP> = 2 digit exponent.

/DAY

= ASCII characters, units of Drift Rate

<INT> = integer, 5 digits

<CR>

<LF>

= carriage return.

= line feed.

For example, enter

F71<CR>

F71 responds:

F71 PHASE=-5.678E-09 s OFFSET=-1.986E-07 DRIFT= 6.013E-08/DAY DAC=24567<CR><LF>

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F72 – Fault Status

Use function F72 to display the fault status of the clock.

•

Clock PLL – Locked or unlocked

Clock Status – Locked or unlocked

Command Line

To display the status of the fault detectors, enter:

F72<CR>

F72 responds:

F72 CLOCK PLL

CLOCK STATUS

LOCKED

UNLOCKED

where:

CLOCK PLL

= Clock Phase Loop Lock status, LOCKED or UNLOCKED

= Clock Status, LOCKED or UNLOCKED to the reference source shown.

CLOCK STATUS

The LOCKED state is based on the F73 Time Threshold value entered

by the operator. F73 Time Threshold sets the threshold in nS above

which Time Error triggers an alarm. When the oscillator's predicted

worst-case time error (“F13 – Time Error” on page 48) exceeds F73

Time Threshold, Time Error enters a fault state and the CLOCK

STATUS becomes UNLOCKED.

F73 – Alarm Control / Status

Use function F73 to do the following:

•

See the state of an indicator (“Locked/Unlocked” or “OK/Fault”)

Enable or disable the alarm for each indicator

See the state of the Alarm Latch for each indicator

Clear the Alarm Latch for all indicators

Enable or disable blinking of the Alarm Status LED on the front panel while it is green or amber

Set the values for Time Threshold, Timeout Delay, and Power-On Alarm Suppress

The following table summarizes F73’s alarm indicators and parameters, as well as the factory settings

for an XL-GPS without options. The factory settings vary depending on the options included at the XL-

GPS at the time it ships from the factory.

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Upate the alarm settings when adding or removing the expansion module from the XL-GPS.

Indicator/Parameter Name

Status

Factory Setting

(XL-GPS without expansion module)

Clock Status

PLL

Locked/Unlocked

OK/Fault

Always Enabled

Alarm Enabled

Alarm Disabled

GPS

DAC

OK/Fault

1st Time Lock

Time Error

Time Threshold

LED Blink

OK/Fault

Alarm Enabled

OK/Fault

Alarm Enabled

(Range 0 to 99,999 nS) 0000 nS

n/a

Enabled

Timeout

OK/Fault

Alarm Enabled

Timeout Delay

Power-On Alarm Suppress

NTP

(Range 0 to 86,400 sec.) 300 sec.

OK/Fault

Yes/No

Alarm Enabled

Clear Alarm Latch

Alarms - General Information

With Alarm Disabled, an F73 indicator does not trigger and alarm when it enters an Unlocked or Fault

state.

With Alarm Enabled, an F73 indicator triggers an alarm when it enters an Unlocked or Fault state, and

the following events take place:

•

The Alarm Status LED changes color from green to amber or red (See “Alarm Status LED” on

page 25.)

•

The ALARM output on the rear panel changes from low Z to high Z (impedance).

If configured, SNMP sends a trap out over the network port. (See “C: SNMP” on page 124.)

The following items may delay an unlocked or fault state from triggering an alarm immediately:

•

Timeout and Timeout Delay postpone Time Error alarms for a user-configured interval. See

“Timeout and Timeout Delay” on page 67.

Power-on Alarm Suppress prevents alarms from being triggered for a user-configured interval

after the XL-GPS boots and starts. See “Power On Alarm Suppress” on page 67.

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Alarm Definitions

Clock Status

Locked: The XL-GPS clock is locked to the GPS reference source and is operating within the F73 Time

Error Threshold.

Unlocked: Check the other alarm indicators to determine the cause of the problem.

PLL

Locked: The clock PLL is locked and operating nominally.

Unlocked: The clock PLL is malfunctioning. Return to Symmetricom for service. See “H: Sales and

Customer Assistance” on page 143.

GPS

Locked: The GPS receiver is receiving a sufficient number of valid GPS satellite signals and is

generating a valid timing solution.

Unlocked: The GPS receiver is not providing a valid timing solution due to one of the following causes:

•

Insufficient visibility of GPS satellites at the antenna location.

Poor GPS satellite signal strength

A poorly positioned GPS antenna

A broken or disconnected antenna cable

An absent or non-functioning GPS receiver card

See “Installing the GPS Antenna” on page 13 for GPS antenna installation guidelines.

DAC

Locked: The DAC, which disciplines the clock oscillator to the reference source, is operating nominally.

Unlocked: The DAC is operating out of specifications. Return to Symmetricom for service. See “H: Sales

and Customer Assistance” on page 143.

1st Time Lock

Time Error and Time Threshold

Time Error issues an alarm when the worst case time error (“F13 – Time Error” on page 48) of the XL-

GPS system clock exceeds the user-set Time Threshold.

Note: With Time Threshold set to zero, the unit applies a default value of 150 nS.

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LED Blink

When LED Blink is enabled, the Alarm Status LED on the front panel blinks when it is green or amber.

The LED does not blink when it is red, even if LED Blink is enabled. Some users disable LED Blink to

ensure that the LED’s color (state) is displayed without interruption.

Timeout and Timeout Delay

Timeout and Timeout Delay can be used to prevent short-term Time Error faults from triggering Time

Error alarms.

Timeout Disabled: All Time Error faults trigger an alarm, regardless of duration.

Timeout Enabled: Only Time Error faults that last longer than the Timeout Delay (measured in seconds)

trigger an alarm. If a Time Error fault clears and returns to an OK state before the Timeout Delay has

elapsed, the ‘countdown’ stops and no alarms are triggered. All Time Error faults start the Timeout Delay

‘countdown’ from the beginning (i.e., Timeout Delay does not keep a countdown tally for multiple Time

Error faults).

Power On Alarm Suppress

Power On Alarm Suppress prevents all F73 alarms from occurring for a specified interval after the unit

starts up. The factory default setting is 300 seconds (five minutes). When that interval ends, current and

new alarms are reported normally.

NTS

OK: NTS is operating nominally.

Fault: NTS is not operating correctly. Contact Symmetricom Customer service. See “H: Sales and

Customer Assistance” on page 143.

Clear Alarm Latch

Use Clear Alarm Latch after troubleshooting or fixing the cause of an alarm so new alarms can be

distinguished from previous ones.

About Alarm Latch: The Alarm Latch shows if an indicator has triggered an alarm at any time since the

last time the Alarm Latch was cleared, even if the indicator is presently “Locked” or “OK”. This feature is

useful for finding and troubleshooting transient alarms. F73 indicators must be enabled in order for

alarms to occur and be latched. The alarm latch does not record the occurrence of a fault or unlocked

state if the indicator is disabled. The Alarm Latch is visible as an asterisk (“*”) when viewing F73 on the

front panel display. For example:

GPS OK

∗

ALARM ENABLED

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Save Changes

Yes: Applies all user-entered changes to the F73 configuration.

No: Clears all user-entered changes and exits the function.

Keypad

Note: The Alarm Latch asterisk is not the same as the “reference source unavailable” asterisk that can

sometimes be seen on the STATUS display.

Command Line

To query the status of F73, enter:

F73<CR>

F73 responds:

F73<SP>S<STATUS>P<SP><123456789ABCD><CR><LF>

where:

= ASCII character F

<SP>

= function number.

= ASCII space character.

= ASCII character S, Status delimiter

<STATUS> = 'L' Locked

'U' Unlocked

= ASCII character ‘P’ - static character, does not indicate status.

= '-' PLL Synthesizer Locked

'C' PLL Synthesizer Unlocked

= '-' not used

= '-' GPS OK

'P' GPS Fault

= '-' not used

= '-' Rb osc OK or not installed

'R' Rb osc Fault

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= '-' DAC OK

'X' DAC Fault

= '-' First time lock OK

'a' Clock has locked since power on but still within the user defined power on time out

'A' Clock has not locked since power on

= '-' Time error OK

'U' Time error Fault

= '-' Timeout OK

'T' Timeout Fault

= '-' NTP OK or option not enabled

'N' NTP Fault

= '-' Future Use

To display the latched faults, enter:

F73 LATCH

The XL-GPS responds in the following format:

F73<SP>LATCH<SEP><123456789ABCDEFGHIJ><CR><LF>

^{The values in <123456789ABCDEFGHIJ> field indicate the latched faults, if any, which h}5^{ave occurred}

since the last time Alarm Latch was cleared.

To clear the Alarm Latch, enter:

F73 CLEAR ALARM LATCH<CR><LF>

The XL-GPS clears Alarm Latches and responds:

OK<CR><LF>

The user can enable or disable the alarm indicators using the MASK command. To display the current

mask, enter:

F73 MASK

The XL-GPS responds in the following format:

F73<SP>MASK<SEP><123456789ABCDEFGHIJ><CR><LF>

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Where the value of each character in <123456789ABCDEFGHIJ> field is either 'E' or 'D'. 'E' means the

corresponding indicator is enabled, and can trigger an alarm if it enters a fault state. 'D' means the

indicator is disabled (or not available) and will not trigger an alarm if it enters a fault state.

To enable ('E'), disable (‘D’), or leave the indicator unchanged (‘-’), enter 'E', 'D', or '-' for each character

in <123456789ABCDEFGHIJ> when you enter the following string:

F73<SP>MASK<SEP><123456789ABCDEFGHIJ><CR>

The XL-GPS will sets the new alarm mask and responds:

OK<CR><LF>

The following summarizes the fault alarm mask setting in the <123456789ABCDEFGHIJ> field:

1 = 'E' PLL Synthesizer Alarm Enabled

'D' PLL Synthesizer Alarm Disabled

2 = 'D' not used

3 = 'E' GPS Alarm Enabled

'D' GPS Alarm Disabled

4 = 'D' not used

5 = 'D' not used

6 = 'D' not used

7 = 'D' not used

8 = 'D' not used

9 = ''D' not used

A = 'E' DAC Alarm Enabled

'D' DAC Alarm Disabled

B = 'E' First time lock Alarm Enabled

'D' First time lock Alarm Disabled

C = 'E' Time error Alarm Enabled

'D' Time error Alarm Disabled

D = 'E' Time out Alarm Enabled

'D' Time out Alarm Disabled

E = 'E' NTP Alarm Enabled

'D' NTP Alarm Disabled (Default if NTP Option not enabled)

Query or set Time Error Threshold using the THRESHOLD command. To query the Time Error

Threshold setting, enter:

F73<SP>THRESHOLD<CR><LF>

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The XL-GPS responds:

F73<SP>THRESHOLD<SP><nanoseconds><SP>ns<CR><LF>

where <nanoseconds>is the time error threshold in nanoseconds, between 0 and 9999.

To set Time Error Threshold, enter a string the following format:

F73<SP>THRESHOLD<SEP><nanoseconds><CR>

The XL-GPS will set the new time error threshold and returns the following string if the command is

successful.

OK<CR><LF>

Set or query Timeout Delay using the TIMEOUT command. To query the current setting, enter:

F73<SP>TIMEOUT<CR><LF>

The XL-GPS responds:

F73<SP>TIMEOUT<SEP><seconds><SP>s<CR><LF>

where <seconds>is the timeout in seconds, between 0 and 86400.

To set Timeout Delay, enter a command string in the following format:

F73<SP>TIMEOUT<SEP><seconds><CR><LF>

The XL-GPS will set the new timeout delay and responds:

OK<CR><LF>

Led blinking can be ENABLED or DISABLED using the BLINK command. To enable LED blinking, enter:

F73<SP>BLINK<SEP>ENABLE<CR>

The XL-GPS responds:

OK<CR><LF>

To disable LED blinking, enter:

F73<SP>BLINK<SEP>DISABLE<CR>

The XL-GPS responds:

OK<CR><LF>

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Use the SUPPRESS command to suppress all F73 faults from triggering alarms for a specified duration

after the XL-GPS power is turned on. To check the SUPPRESS status, enter:

F73<SP>SUPPRESS<CR>

The XL-GPS responds in the following format:

F73<SP>POWER-ON<SEP>MINOR<SEP>ALARM<SEP>SUPPRESS<SEP> <seconds><CR><LF>

where:

= ASCII character F.

= function number.

<seconds> = seconds from 0 to 86400.

<SP>

<SEP>

<CR>

<LF>

= ASCII space character.

= one or more space characters, either comma, space, or tab.

= Carriage Return.

= Line Feed.

To set the SUPPRESS enter a command using the following format:

F73<SP>SUPPRESS<SEP><seconds><CR>

The seconds can be set to any value from 0 to 86400. The XL-GPS responds:

OK<CR><LF>

F90 – Code Output Configuration

Use function F90 to select AM or DC modulation of the IRIG-B time code on the following outputs:

•

the CODE output on the Main CPU card

the J1 through J3 outputs on the Expansion Module

The factory configuration for F90 is IRIG-B AM.

Note: For the Expansion Module, the IRIG-B modulation type is controlled by a hardware jumper setting

and by F90. The four “JP2 - Output Header” jumpers located on the Expansion Module individually set

the modulation types on J1, J2, J3, and J4. The modulation is AM when the jumper is set to AM,

regardless of the software setting in F90. If the jumper is set to DC, F90 can be used set the output to

either AM or DC. In other words, the F90 setting applies to all outputs, unless the jumper setting is AM.

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Although the factory configuration outputs UTC time in 24-hour format, the following can be used to

modify the code output of F90 for non-standard applications:

•

“F2 – 12/24 Hour Format” on page 35 selects between a 12 or 24-hour time format.

“F69 – Time Mode” on page 61 selects between the following timescales: Local, Standard, GPS,

UTC, and TAI.

Command Line

To display the current settings, enter:

F90<CR>

XL-GPS responds using the following format:

F90<S>IRIG-B<S><TYPE><CR>

where:

= ASCII character F.

= function number.

= Space

<S>

IRIG-B = ASCII string indicating that the time code output is IRIG-B

<TYPE> = AM, DC

<CR>

<LF>

= carriage return character.

= line feed character.

For example, enter:

F90<CR>

XL-GPS responds (example):

F90 IRIG-B AM<CR><LF>

To change the Code Output to DC enter:

F90 IRIG-B DC<CR>

To change the Code Output back to AM enter:

F90 IRIG-B DC<CR>

XL-GPS responds:

OK<CR><LF>

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F100 – Network Port Configuration & XL-GPS Firmware

F100 provides two groups of commands:

•

Group 1, available through the keypad and the command line, provides access to network port

settings and hardware/Firmware status information.

Group 2, available through the command line only, provides commands for changing system

firmware, changing NTP & SNMP parameters, changing the user name/password, resetting the

unit, and pinging other network devices.

Warning: The F100 commands have the capacity to remove the XL-GPS from the network and disable

the XL-GPS’s system firmware. Use judiciously.

Reboot Warning: Saving changes to any F100 parameter using the keypad will reboot the XL-GPS.

Some of the F100 command line commands also reboot the XL-GPS. These are identified in the

following documentation.

Group 1

You can use both the keypad and the command line interface to access the following parameters:

•

Ethernet address: XL-GPS contains a unique Ethernet or Media Access Control (MAC) address

comprised of a unique number assigned to the manufacturer, and a unique number assigned to

the unit. This is factory set and cannot be changed.

•

IP Address: Sets a static Internet Protocol (IP) address for the unit.

Subnet Mask: Sets a valid subnet-mask used in IP addressing. Subnetting allows for the more

efficient allocation of network addresses and management of network traffic.

•

Default Gateway: The address of the router that handles packets addressed to IP devices outside

the local-area network.

•

10 100 BASE-T: View network port setting: 10 or AUTO.

Remote Lockout: Enables or disables remote access through the XL-GPS’s standard network

port. Enabling Remote Lockout limits users to the front-panel keypad or Serial I/O port.

•

Flash CRC: Status - Passed or failed.

RAM: Status - Passed or failed.

Serial: Status - Passed or failed.

Version Test: Status - Passed or failed

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The following table gives the command line equivalents for each of the preceding parameters:

Description

“F100” followed by:

Comments

Ethernet address

(MAC address)

Displays information

IP Address

Displays, configures and reboots

Displays several IP parameters

Subnet Mask

Default Gateway

IP Address, Subnet Mask, IC

and Default Gateway

10 100 BASE-T

Remote Lockout

Flash CRC

RAM

BASET

Displays network port setting

L (for status), LOCK, UNLOCK Displays and configures

Displays information

Serial

Version Test

(NVRAM Ver)

Group 2

The following expanded command set is available through the command line interface:

Description

“F100” followed by: Comments

Burn Host

Configure

Burn

Commit action

Move files

Burn Bootloader

Burn Filesystem

BUB

Configure NTP & SNMP Parameters CONFIG

Factory Mode Jumper

Reboot

Display only

K I L L

Commit action – reboot the XL-

GPS

Change User Password

Ping

Configure

Commit action

Change User Name

You can reconfigure two or more network parameters in a single entry by sending the F100 command

and entering new values. Leading zeros may be omitted when entering IP Address, Subnet Mask, and

Default Gateway. Any field may be omitted and order is not significant. Blanks are allowed on either side

of a colon. The unit reboots after any network parameter is changed.

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F100 EA – Ethernet Address

Use function F100 EA to display the Ethernet Address (MAC Address) (Note: An Ethernet or MAC

Address is not the same thing as an IP Address), a fixed, six-byte, hexadecimal value specific to the

unit’s standard network port. The first three bytes are registered to Symmetricom Inc.; the last three

bytes are the hex value identifying the network port.

To display the Ethernet address of the unit standard network port, enter:

F100 EA<CR>

XL-GPS responds:

F100 EA:00-A0-69-xx-xx-xx<CR><LF>

where “00-A0-69” is the portion of the address assigned to the manufacturer, and “xx-xx-xx” is unit’s

unique address (in hexadecimal).

An example of the response is:

F100 EA:00-A0-69-99-00-37

Attempts to set this field will be rejected with a syntax error message.

F100 IP – IP Address

Use function F100 IP to display or change the unit’s IP Address.

Use the following format to display the IP address:

F100<S>IP<CR>

Use the following format to set the IP address and restart the unit, enter:

F100<S>IP<S><nnn.nnn.nnn.nnn><CR>

where:

= ASCII character F

= unit function number

= space

100

<S>

= specify IP command

<nnn.nnn.nnn.nnn> = dotted decimal address (0 to 255)

<CR> = input line terminator

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For example, enter:

F100 IP 206.54.0.21<CR>

XL-GPS responds:

OK<CR><LF>

RESETING THE UNIT<CR><LF>

PLEASE WAIT…<CR><LF>

To obtain the IP address of the unit Standard network port, enter:

F100 IP<CR>

XL-GPS responds (example):

F100 IP 206.54.0.21<CR><LF>

The three commands, F100 IP, F100 SM, and F100 G, can be concatenated to set all three values

simultaneously. To do so use the following format:

F100<S>IP<S><nnn.nnn.nnn.nnn><S>SM<S><nnn.nnn.nnn.nnn><S>G<S><nnn.nnn.nnn.nnn><CR>

Note: The three commands (i.e., IP, SM, G) can be used in any order relative to each other. A colon

separator “:” can be used instead of <S> following IP, SM, and G (e.g., IP:192.168.46.150)

For example, using appropriate values for your network, enter something similar to:

F100 IP 192.169.46.150 SM:255.255.255.0 G 192.168.46.1<CR>

XL-GPS responds:

OK<CR><LF>

RESETING THE UNIT<CR><LF>

PLEASE WAIT…<CR><LF>

F100 SM – Subnet Mask

Note: F100 SM can be used concurrently with F100 IP and F100 G. See the last example provided in

the F100 IP – IP Address section, directly above this one.

Use function F100 SM to display or configure the Subnet Mask. To set the Subnet Mask and restart the

unit, enter:

F100<S>SM<S><nnn.nnn.nnn.nnn><CR>

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where:

= ASCII character F

100

<S>

= unit function number

= space

= specify IP command

<nnn.nnn.nnn.nnn> = dotted decimal address (0 to 255)

<CR>

= input line terminator

For example, enter:

F100 SM 255.255.255.240<CR>

XL-GPS responds:

OK<CR><LF>

RESETING THE UNIT<CR><LF>

PLEASE WAIT…<CR><LF>

To obtain the Subnet Mask of the unit Standard network port, enter:

F100 SM<CR>

XL-GPS responds:

F100 SM <nnn.nnn.nnn.nnn><CR><LF>

where “<nnn.nnn.nnn.nnn>” is the dotted decimal address notation.

An example of the response is:

F100 SM:255.255.255.125<CR><LF>

F100 G – Gateway

Note: F100 G can be used concurrently with F100 IP and F100 SM. See the last example provided in

the F100 IP – IP Address section, which starts on page 76.

Use function F100 G to display or configure the Default Gateway. To set the Default Gateway and restart

the unit, enter:

F100<S>G<S><nnn.nnn.nnn.nnn><CR>

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where:

= ASCII character F

100

<S>

= unit function number

= space

= specify IP command

<nnn.nnn.nnn.nnn> = dotted decimal address (0 to 255)

<CR>

= input line terminator

For example, enter:

F100 G 206.54.0.17<CR>

XL-GPS responds:

OK<CR><LF>

RESETING THE UNIT<CR><LF>

PLEASE WAIT…<CR><LF>

To obtain the Default Gateway of the unit Standard network port, enter:

F100 G<CR>

XL-GPS responds:

F100 G <nnn.nnn.nnn.nnn><CR><LF>

where “<nnn.nnn.nnn.nnn>” is the dotted decimal address notation.

An example of the response is:

F100 G:206.54.0.1<CR><LF>

F100 IC – Network Port Settings

Use function F100 IC to review the entire configuration of the standard network port, enter:

F100<S>IC<CR>

An example of the response is:

F100 IP:206.54.0.21 SM:255.255.255.240 G:206.54.0.17<CR><LF>

F100 BASET – 10/100 BASE- T

The BASET command displays the data rate of the Ethernet port. On the current version of the Main

CPU card (87-8000) running the current system software version, the user also has the option of

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selecting between 10 Base-T and Auto. If you have questions about your unit, contact H: Sales and

Customer Assistance (page 143).

To display the current Base-T setting, enter:

F100<S>BASET<CR>

where

= ASCII character F

= unit function number

= Space

100

<S>

BASET = specify Base-T command

<CR> = input line terminator

XL-GPS responds:

F100 BASET 10T<CR><LF>

To set the Ethernet port to automatically negotiate the maximum connection speed, enter:

F100<SP>BASET<SP>AUTO<Enter>

To set the Ethernet port’s connection speed to 10Base-T, enter:

F100<SP>BASET<SP>10<Enter>

XL-GPS responds:

OK <CR><LF>

RESETING THE UNIT<CR><LF>

PLEASE WAIT…<CR><LF>

F100 L/LOCK/UNLOCK – Remote Lockout

Use function F100 LOCK or UNLOCK to enable/disable remote access to the command line interface

through the network port. Use function F100 L to display the status of Remote Lockout. Remote Lockout

can also be set using F100 on the keypad interface. The factory setting is “Unlocked”. To unlock remote

lockout, use the keypad or the serial port’s command line interface (The network port is not available

because it has been locked).

Warning: F100 L and F100 LOCK terminates any active network sessions and prevents future

network sessions. To unlock F100 L or F100 LOCK, use the serial port command line

interface or the keypad display.

To lock the unit from a remote location, enter:

F100 LOCK<CR>

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where:

= ASCII character F

100 = unit function number

<S> = space

LOCK = specify LOCK command

<CR> = input line terminator

For example, enter:

F100 LOCK<CR>

To users on the serial port, XL-GPS responds:

OK<CR><LF>

Or, to users on the network port, XL-GPS gives the following response and then closes the port:

GOODBYE.<CR><LF>

To unlock remote lockout, use the command line interface on the serial port to enter:

F100 UNLOCK<CR>

Or use the keypad’s F100.

F100 L – Remote Lockout Status

Command Line Only – Not available in keypad.

Use function F100 L to display the status of the remote lock. For more information, see F100 LOCK

above.

To view the lock setting for remote access, enter:

F100 L<CR>

where:

= ASCII character F

100 = unit function number

<S> = space

= specify L command

<CR> = input line terminator

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XL-GPS responds:

F100 L LOCKED<CR><LF>

F100 L UNLOCKED<CR><LF>

F100 ST – Self Test Status

Use function F100 ST to display whether the Self Test Status parameters passed or failed. The

parameters include: flash-memory checksum test, nonvolatile (NV) RAM, Serial Port, and version check.

To query the self-test status, enter:

F100<S>ST<CR>

where:

= ASCII character F

100 = unit function number

<S> = space

= specify ST command

<CR> = input line terminator

XL-GPS responds:

F100<S>ST<S>FLASH/CRC:<S><STATUS>,<S>RAM:<S><STATUS>,<S>SERIAL:<S><STATUS>,

<S>NVRAM<S>VER:<S><STATUS><CR><LF>

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where:

= ASCII character F

100

<S>

= Unit function number

= Space

= Specify ST command

FLASH/CRC: = Specify flash checksum result

RAM:

= Specify RAM test result

SERIAL:

= Specify Serial Port test result.

NVRAM VER: = Specify version test result. This test compares the version of the code against the version

recorded in Non-Volatile memory

= Is either ASCII PASS or FAIL

= ASCII comma

= ASCII colon

= Output line terminator

An example of the response is:

F100 ST FLASH/CRC : PASS, RAM : PASS, SERIAL : PASS, NVRAM VER : PASS<CR><LF>

F100 BH – Burn Host

Use function F100 BH, when upgrading firmware, to select the FTP host and the file to be transferred.

To select the FTP host and file for upgrading, enter:

F100 BH <FTP HOST IP ADDRESS><S><UPGRADE FILE PATH>/<FILE NAME><CR>

Use UNIX style forward slashes ‘/’ in path and do not describe the drive (for example, ‘C’) in the path.

For example:

F100 BH 10.1.7.20 symmetricom/XL-GPS/192-8001.bin<CR>

XL-GPS responds:

BURN HOST IS READY!!!<CR><LF>

F100 BUB – Burn BootLoader

Note: See “B: Upgrading System Firmware” on page 118.

When upgrading the system firmware, use function F100 BUB to burn the BootLoader, to write the

BootLoader to flash memory.

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To write the BootLoader to the flash, send the F100 BH command with the FTP host, file path and name,

and then enter:

F100 BUB<CR>

XL-GPS responds:

OK<CR><LF>

For example:

>f100 bub

BURNING FILE 192-8000.bt WITH SIZE 452164 TO PARTITION:0 SECTOR:0

SEC: 0 RE: 0

SEC: 1 RE: 0

SEC: 2 RE: 0

SEC: 3 RE: 0

SEC: 4 RE: 0

SEC: 5 RE: 0

SEC: 6 RE: 0

FLASH SUCCESSFULLY PROGRAMMED CRC32 = 0x9EFBE60A

If more than ten flash sectors are written during this process, then an error has occurred in the burn. You

must rewrite both the bootloader sectors (0 to 9) and the program binary sectors (10 to 93).

F100 BU – Burn

Note: See “B: Upgrading System Firmware” on page 118.

Use function F100 BH when upgrading firmware, to write the file selected with F100 BH to the flash

memory. Flash memory is checked to ensure that the correct file is used.

To write the file to the flash, send the F100 BH command with the FTP host, file path and name, and then

enter:

F100 BU<CR>

XL-GPS responds:

OK<CR><LF>

And, for example, displays the following text:

>f100 bu

BURNING FILE 192-8001.bin WITH SIZE 803016 TO PARTITION:1 SECTOR:16

SEC: 16 RE: 0

SEC: 17 RE: 0

SEC: 18 RE: 0

SEC: 19 RE: 0

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SEC: 20 RE: 0

SEC: 21 RE: 0

SEC: 22 RE: 0

SEC: 23 RE: 0

SEC: 24 RE: 0

SEC: 25 RE: 0

SEC: 26 RE: 0

SEC: 27 RE: 0

SEC: 28 RE: 0

FLASH SUCCESSFULLY PROGRAMMED CRC32 = 0x2D9A260A

F100 BF – Burn File System

Note: See “B: Upgrading System Firmware” on page 118.

Use function F100 BF to burn file system when upgrading firmware, to write a file system to the flash

memory.

To write the file system to the flash, send the F100 BH command with the FTP host, file path and name,

and then enter:

F100<S>BF<CR>

XL-GPS responds:

OK<CR><LF>

For example:

>f100 bf

BURNING FILE 192-8002.fs WITH SIZE 524288

SEC: 94

SEC: 95

SEC: 96

SEC: 97

SEC: 98

SEC: 99

SEC: 100

SEC: 101

SEC: 102

F100 BUFP – Burn FPGA Firmware

Note: See “B: Upgrading System Firmware” on page 118.

F100 BUFP - Burn FPGA firmware from host to target flash

Use Serial/Network port F100 BUFP when upgrading FPGA firmware - to write the FPGA program file

selected with F100 BH to the flash memory. Prior to issuing the F100 BUFP command, the host

computer must be setup as an FTP server with the new FPGA program file stored on the FTP server.

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The existence of the FPGA program file on the FTP server and an Ethernet connection is checked when

the command is issued.

To write the FPGA program to the flash, send the F100 BH command with the FTP host, file path and

name, and then send the following command:

F100 BUFP<Enter>

This command is only valid for XL-GPS with an 86-8000 Rev. G or higher Main CPU card. If the Main

CPU card is of the wrong version, an error message "ERROR: INVALID COMMAND!" will be displayed.

This command is valid only via the command line interface in the following scenarios: (1) the terminal is

communicating to the XL-GPS directly via the serial port, or (2) the terminal is connected to the XL-GPS

network port and the user is logged in as an "operator". If the terminal is connected to the XL-GPS

network port and the user is logged in as a "guest", this command will be deemed invalid and an error

message, "ERROR: ACCESS DENIED!" will be displayed.

Prior to burning the FPGA program to the target flash, another error checking step is performed. The

new FPGA program size is checked against the designated memory sector in the target flash. If the

memory sector is not big enough to store the FPGA program, the command will be aborted, an error

message, "FILE FN, EXT (yyy BYTES) TOO LARGE FOR PARTITIONING (zzz BYTES), LOAD

ABORTED" will be displayed, and the new program will not be loaded to the flash.

After all the requirements for burning the FPGA program are met, XL-GPS will proceed to burn the

FPGA program from the FTP host computer to the target flash by responding with the following output

string.

OK<CR><LF>

Then, during the file burning process, output strings will be displayed on the terminal to provide status to

the operator. The following is an example of a successful F100 BUFP command execution.

BURNING FILE 182-9004V001.bin TO PARTITION: 3, SECTOR: 10

FILE: 166792 BYTES, PARTITION: 262132 BYTES (63% USED)

SEC: 10 RE: 0

SEC: 11 RE: 0

SEC: 12 RE: 0

SEC: 13 RE: 0

SEC: 14 RE: 0

SEC: 15 RE: 0

SEC: 16 RE: 0

FLASH SUCCESSFULLY PROGRAMMED

To load the FPGA program from the target flash to the FPGA, a reboot of the XL-GPS is required for the

new FPGA program to take effect. The XL-GPS can be rebooted via power cycle or by issuing the F100

K I L L command on the serial port interface.

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F100 CONFIG – Configure NTP & SNMP

Notes:

•

See “A: Using F100 Configuration” on page 114.

NTP is an optional feature. If purchased at the same time as the XL-GPS, it comes enabled on

the system. To purchase this option after you have purchased the XL-GPS, contact

Symmetricom Sales. See “H: Sales and Customer Assistance” on page 143.

F100 CONFIG GET instructs the XL-GPS unit to transfer its NTP and SNMP configuration files to an

_{FTP server. After editing the NTP and SNMP configuration files on the FTP server, the us}2_{er transfers}

them back to the XL-GPS using the F100 CONFIG SET command.

Open a Telnet session with the XL-GPS and enter the commands below. Replace <IP Address> with that

of the workstation/FTP Server. Leave <subdir> blank (unless you have a specific reason for placing the

files in a subdirectory of the anonymous user’s home directory).

To get the NTP config files, type:

>f100 config ntp get host:<IP Address> dir:<subdir><CR>

To get the SNMP config file, type:

>f100 config snmp get host:<IP Address> dir:<subdir><CR>

To get both the SNMP and NTP config files, type:

>f100 config ntp snmp get host:<IP Address> dir:<subdir><CR>

Here’s an example of a successful SNMP and NTP config file transfer:

>f100 config ntp snmp get host:192.168.0.1 dir:

Host config ip 192.168.0.1 already configured

Source file /config/snmp.conf bytes read: 1275

Dest file snmp.conf bytes written: 1275

Source file /etc/ntp.conf bytes read: 1166

Dest file ntp.conf bytes written: 1166

Source file /etc/ntp.keys bytes read: 44

Dest file ntp.keys bytes written: 44

Configuration files transferred successfully!

Note: The following steps cause the XL-GPS to reboot.

Using the command line, enter the commands, replacing <IP Address> with the workstation/FTP

server’s IP address.

To move the NTP config files back onto the XL-GPS, type:

>f100 config ntp set host:<IP Address> dir:<subdir><CR>

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To move the SNMP config file back onto the XL-GPS, type:

>f100 config snmp set host:<IP Address> dir:<subdir><CR>

To move the NTP and SNMP config files back onto the XL-GPS, type:

>f100 config ntp snmp set host:<IP Address> dir:<subdir>

Here’s an example of a successful SNMP and NTP config file transfer:

>>f100 config set ntp snmp host:192.168.0.1 dir:

Host config ip 192.168.0.1 already configured

Are you sure(y/N)?y

Source file snmp.conf bytes read: 1275

Dest file /config/snmp.conf bytes written: 1275

Source file ntp.conf bytes read: 1166

Dest file /etc/ntp.conf bytes written: 1166

Source file ntp.keys bytes read: 44

Dest file /etc/ntp.keys bytes written: 44

Configuration files transferred successfully!

Resetting...

After XL-GPS receives the configuration files, it reboots, and goes through the normal startup process.

F100 J – Factory Mode Jumper

Use function F100 J command to test the state of the ‘factory mode’ jumper. A value of 1 means the

jumper is installed and a value of 0 means the jumper is not. The factory mode jumper can be identified

because it is the only three-prong jumper on the Main CPU card, and is labelled “J3”.

Units are shipped to the customer with no jumper installed. The jumper is used by Symmetricom

technicians to test and configure the unit. With this jumper installed, the operation and integrity of the XL-

GPS are compromised.

Warning: Do not run the XL-GPS with the jumper, unless specifically directed to do so by a

qualified Symmetricom technician.

To test the state of the factory mode jumper:

F100<S>J<CR>

where:

= ASCII character F

100 = unit function number

<S> = space

= specify User Name command

<CR> = input line terminator

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XL-GPS responds:

F100 J FACTORY MODE=1<CR><LF>

F100 J FACTORY MODE=0<CR><LF>

F100 K I L L – Reboot

Use function F100 K I L L to reboot the unit. Use F100 K I L L after upgrading the system firmware.

K I L L is a case-sensitive command. When entering this command, use all capital letters and put

spaces between each letter.

To reboot the unit, enter:

F100 K<S>I<S>L<S>L<CR>

For example:

F100 K I L L<CR>

XL-GPS responds:

OK <CR><LF>

RESETING THE UNIT<CR><LF>

PLEASE WAIT…<CR><LF>

In a network port session, rebooting the XL-GPS terminates the network port session; open a new

network port session when the XL-GPS has finished rebooting. In a serial port session, the XL-GPS

displays text similar to the following example when the XL-GPS has finished rebooting and is ready to

receive additional commands:

>SYSTEM POWER ON SELF TEST RESULTS:

SERIAL LOOPBACK TEST PASSED.

RAM TEST PASSED.

PROG CRC TEST PASSED

NETWORK INTERFACE 192-8001

FLASH FILE SYSTEM MOUNTED.

SOURCE FILE /config/symmetricom.conf BYTES READ: 1210

FILE SYSTEM REV # 1.80

SCAN_FOR_OPT_CARD BEGINS.

FOUND @ ADDR 30004000H, ID NUM= 87H

SCAN_FOR_OPT_CARD ENDS.

INSTALL_SMART_OPTIONS BEGINS.

FOUND GPS CARD; QTY=1, ID#=8028-2H.

INSTALL_SMART_OPTIONS ENDS.

QUERYING FOR SYMMETRICOM DEVICE. PLEASE WAIT...

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SYMMETRICOM GPS DEVICE.

XL-GPS

INITIALIZATION SUCCESSFULLY COMPLETED.

F100 P – Change User Password

Use function F100 P to change a user password. In a network port session, F100 P changes the

password of the user you logged in as; operator or guest. In a serial port session, F100 P changes the

password of the operator user. See “Command Line Interface” on page 29.

Valid password size is from no characters to 64 characters. If more than 64 characters are entered,

F100 P truncates the string to 64 characters. When selecting a password, use appropriate levels

password security for the XL-GPS’s operating environment. Examples include:

•

Mixing random alpha and numeric characters

Avoiding words or word combinations that can be found in a dictionary

To change the user password, enter:

F100<S>P<CR>

where:

= ASCII character F

100 = unit function number

<S> = space

= specify Password command

<CR> = input line terminator

XL-GPS responds:

ENTER NEW USER PASSWORD:

When you enter the new password, XL-GPS responds:

CONFIRM NEW USER PASSWORD:

Enter the same new password again, to confirm the spelling. If the same new password has been

entered twice, XL-GPS responds:

OK<CR><LF>

In this case, the new password will be used for the next login. However, if the new password is entered

differently the second time, XL-GPS responds:

ERROR: PASSWORDS DO NOT MATCH. NEW PASSWORD REJECTED.

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F100 PI – PING

Use function F100 PI to ping a remote host to see if it is reachable. If no IP Address is provided, F100 PI

uses the XL-GPS’s own IP Address, and tests whether the XL-GPS’s network port has a good network

connection.

To ping a known host, enter:

F100 PI<S><IP Address><CR>

For example:

F100 PI 206.254.000.021<CR>

The unit responds (example):

PING 206.254.000.021: REMOTE HOST FOUND.<CR><LF>

PING 206.254.000.021 : REMOTE HOST NOT FOUND.<CR><LF>

To test if the XL-GPS’s network port has a good connection, enter the following using in a serial port

session:

>f100 PI<CR>

XL-GPS responds:

PING : REMOTE HOST FOUND.<CR><LF>

or it responds:

PING : REMOTE HOST NOT FOUND.<CR><LF>

F100 PN – Change User Name

Use function F100 PN to change a user name. In a network port session, F100 PN changes the name of

the user you logged in as; operator or guest. In a serial port session, F100 PN changes the name of the

operator user. See “Command Line Interface” on page 29.

To change the user name, enter:

F100<S>PN<CR>

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where:

= ASCII character F

100 = unit function number

<S> = space

= specify User Name command

<CR> = input line terminator

XL-GPS responds:

ENTER NEW USER NAME:

When you enter a new user name, XL-GPS responds:

CONFIRM NEW USER NAME:

Enter the same new user name again, to confirm the spelling. If the same new user name has been

entered twice, XL-GPS responds:

OK<CR><LF>

In this case, the new user name will be used for the next login using the command line interface.

However, if the new user name is entered differently the second time, XL-GPS responds:

ERROR: USER NAMES DO NOT MATCH. NEW USERNAME REJECTED!<CR><LF>

In this case, the old user name will be used for the next login using the command line interface.

If you have forgotten the operator or guest user name and/or password, use “Bootloader Mode” to

change them. In Bootloader Mode, log in using the default user names (“operator” and ”guest”) and

passwords (See “Using the Command Line Interface” on page 18.). Then use F100 PN and F100P to set

the new user names and passwords. Once this has been completed, reboot the unit and log in using the

new username or password. See “F100 P – Change User Password” on page 90.

Bootloader Mode

To enter Bootloader Mode when resetting a forgotten user name (F100 PN) or password (F100 P):

•

Reboot the XL-GPS using the F100 K I L L – Reboot command.

Immediately press the MENU key on the keypad and hold down while the XL-GPS is rebooting.

The XL-GPS will display will ‘hang’ while displaying “BOOTING”.

•

After a few moments, release the MENU key.

Open a command line session with the XL-GPS.

Use the F100 PN or F100 P commands as needed and then reboot the XL-GPS again.

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F108 – Oscillator Configuration

Use function F108 to display the type of oscillator being used:

•

TCXO

OCXO

For oscillator specifications, see “Oscillators” on page 11.

Command Line

The oscillator type is defined by the hardware configuration of the clock, and is not configurable through

the command line or keypad user interfaces. To request the oscillator configuration, enter:

F108<S><CR>

XL-GPS responds:

F108<S>OSCILLATOR<S>CONFIG<S><OSC><CR><LF>

where:

= ASCII character F

108

<S>

= Function number

= ASCII space character one or more

<CR> = Carriage Return, equivalent to pressing the Enter key on a keyboard

<OSC> = Oscillator type: TCXO, OCXO

For example, enter the following string:

F108<CR>

XL-GPS responds (example):

F108 OSCILLATOR CONFIG TCVCXO<CR><LF> (or OCXO)

F110 – J1 Input (TIET)

Note: Time Interval - Event Time (TIET) is an optional feature. If purchased at the same time as the XL-

GPS, it comes enabled on the system. To purchase this option after you have purchased the XL-

GPS, contact Symmetricom Sales. See H: Sales and Customer Assistance (page 143)

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F110 performs two separate functions:

•

Configure the J1 input port for a TIET signal

Display TIET information.

Keypad

•

J1 Input Config: Displays “DISABLE” if the function has not been purchased and installed.

Displays “TIET” if the TIET option has been purchased and installed.

•

J1 Select Function: If TIET is enabled, select DISPLAY TIET MEAS to display TIET information

such as Time Interval or Event Time, or select J1 INPUT CONFIG to configure the J1 for a TIET

input signal.

•

Select TIET Measurement: If DISPLAY TIET MEAS was selected, select whether to display

TIME INTERVAL or EVENT TIMING on the front panel.

J1 Input Impedance: For short runs (<200 ft.), select 100 kΩ. For long runs (>200 ft.), select

50Ω.

Input Polarity: Positive only.

Upon changing the settings, the last display prompt asks:

Save Changes?: (Yes, No) Yes applies the changes. No cancels the changes.

•

For J1 specifications, see “1 PPS Out” on page 6.

Notes: Stray capacitance loading on the J1 input adversely impacts TIET measurements.

Command Line

Use F110 to query or configure the J1 TIET input, or to query TIET information.

To request the J1 Input Configuration, enter:

F110<CR>

The port responds with the ASCII character string:

F110<S>TIET<S><Impedance><S><Sign><CR><LF>

(when TIET option is enabled and J1 has a TIET input)

Where the F110 entry and request formats are defined as:

= ASCII character F.

110

TIET

<S>

= function number.

= ASCII character string "TIET" for configuring J1 for TIET measurement

= ASCII space character one or more

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= ASCII character F.

<Impedance> = 100K, 50

= line terminator, either a carriage return and line feed for output strings or a

carriage return only for input strings.

Sample request:

F110<CR>

XL-GPS responds (example):

F110 TIET 50 POSITIVE<CR><LF>

To the configure TIET input with a different impedance value, enter (example):

F110 TIET 100K POSITIVE<CR>

XL-GPS responds:

OK<CR><LF>

To obtain TIET measurement from J1, enter:

F110 TIET TIME<CR>

XL-GPS responds:

OK<CR><LF>

.xxxxxxxxx<CR><LF>

(Time Interval (display continues until function termination with Ctrl+C)

Or, (example):

F110 TIET EVENT<CR>

XL-GPS responds:

OK<CR><LF>

ddd:hh:mm:ss.xxxxxxxxx<CR><LF>

(Event Timing display continues until function termination with Ctrl+C)

F110 responds "F110 TIET OPTION IS NOT ENABLED" to any of the commands above if the TIET

option has not been enabled by the operator using the F126 Options Key Entry command.

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F111 – J2 Output (Rate, PPO)

Use function F111 to configure the J2 Output to generate one of several rates or, optionally, a

Programmable Pulse Output (PPO). F111 selects from one of the following rates: 1 PPS, 10 PPS,

100 PPS, 1 kPPS, 10 kPPS, 1 MPPS, 5 MPPS, 10 MPPS, or PPO. The default factory setting is

10 MPPS.

Note: PPO is an optional feature. If purchased at the same time as the XL-GPS, it comes enabled on

the system. To purchase this option after you have purchased the XL-GPS, contact Symmetri-

com Sales. See “H: Sales and Customer Assistance” on page 143.

For J2 specifications, see “J2 - Rate Out” on page 5 or “J2 - Optional Programmable Pulse Out (PPO)”

on page 6.

Notes on F111 PPO:

•

PPO can provide a single pulse output or repetitive pulse outputs.

PPO can start and stop the pulse at any time in the year, with a resolution of one microsecond.

The repetition rates from PPO are based on "wildcards". See “Repetitive PPO pulse outputs” on

page 98 regarding usage of "wildcards" to specify PPO repetition rates.

•

PPO can provide the following sub-second repetition rates: 100 kPPS, 10 kPPS, 1 kPPS, 100

PPS, and 10 PPS.

If PPO only specifies one time, it is the start time. The stop time is automatically set for one

microsecond later.

Keypad

Selecting one of the Standard Rates: Using the keypad, press the ENTER, 111, ENTER buttons.

Select one of the standard rates using the up/down arrow buttons and press the ENTER button again.

When prompted “Save changes? Yes”, press the ENTER button one more time.

Programming the PPO option: If available, “PPO” appears as the first option when you enter F111.

Press the ENTER button to start programming PPO (Otherwise, use the up/down arrow buttons to select

one of the standard rates). The display shows the “PULSE START TIME” followed by the Time of Year

and Time of Day fields. Program the PPO option as explained in the Command Line section, below. Use

the CLR key to enter the “X” wildcards, if needed.

Command Line

Requesting the Current Configuration

To request the J2 Output Configuration, enter the following:

F111<CR>

XL-GPS responds in the following format:

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F111<S><RATE><CR><LF>

F111<S>PPO<S><START><S><STOP><CR><LF>

Where:

= ASCII character F

= Function number

111

PPO

<S>

<RATE>

= ASCII character string "PPO"

= ASCII space character one or more

= Output rate or type, RATE 1 PPS, RATE 10 PPS, RATE 100 PPS, RATE 1 kPPS, RATE

10 kPPS, RATE 100 kPPS, RATE 1 MPPS, RATE 5 MPPS, RATE 10 MPPS

<START> & <STOP> = Time-of-year with microsecond resolution in the format of yyy:hh:mm:ss.uuuuuu.

Range: [001:00:00:00.000000, 366:23:59:59.999999] Note: Wildcard character: 'X' or

'x' can also be entered. See the section regarding time string with wildcard character.

Colon separators (“:”) are required

= Line terminator: a carriage return and line feed for output strings, or a carriage return

for input strings

Sample request:

F111<CR>

The XL-GPS displays a fixed 10 PPS rate output (example):

F111 RATE 10PPS<CR><LF>

. Or, displays the PPO settings (example):

F111 PPO 120:22:56:12.000000 120:22:56:12.000003<CR><LF>

Setting the J2 Output Configuration

To set the J2 Output Configuration, send a character string with the previously defined F111 entry format

to the Serial/Network port. Only valid values are accepted. The J2 Output Configuration can be set to

specify one of several predetermined rates, a single PPO pulse outputs, and repetitive PPO pulse

outputs. The following sections provide examples (and some explanations) for each.

Predetermined RATE output

For example, to produce a fixed 100 kPPS rate output, enter:

F111 RATE 100KPPS<CR>

XL-GPS responds:

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OK<CR><LF>

Single PPO pulse output

For example, to produce a a single pulse with duration of 1 second on January 1, enter:

F111 PPO 001:00:00:00.000000 001:00:00:01.000000 <CR>

XL-GPS responds:

OK<CR><LF>

Or, for example, to produce a single pulse with duration of 1 microsecond on January 1, enter:

F111 PPO 001:00:00:00.000000<CR>

XL-GPS responds:

OK<CR><LF>

Repetitive PPO pulse outputs

Repetitive PPO pulse output function can be used to produce repetitive pulses from once per year up to

100,000 per second.

To issue repetitive pulses using PPO, "wildcards" are utilized in the Start Time (and Stop Time) fields.

Through the command line interface, the user may place 'X' (or 'x') in the time fields of the F111

command. The 'X' (or 'x') character is referred to as the "wildcard" in the PPO time fields. The most

significant non-wildcard-digit in the time field is used to specify the Start (or Stop) Time of the repetitive

pulses, which in turn specifies the pulse width of the repetitive pulses. The least significant "wildcard"

character (the one to the immediate left of the most significant non-wildcard-digit) specifies the period of

repetition.

When specifying repetitive rates, the Start Time must include the same number of significant digits as the

Stop Time or an ambiguous output may occur.

Any time the clock reads a new time that matches the specified least significant digits, a pulse either

starts or stops. For example, the following string produces a pulse at midnight every day with a “1” in the

least significant digit:

F111 PPO XX1:00:00:00.000000 XX1:00:00:01.000000<CR>

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Clock Reading

Pulse

001:00:00:00.000000 Start

001:00:00:00.000001 No Change

001:00:00:01.000000 Stop

001:01:00:00.000000 No Change

001:00:00:00.000000 Start (etc...)

For example, to produce a repetitive 5 microsecond pulse occurring every 10 microseconds (i.e.,

repetitive pulses with 100 kPPS frequency with the start time or rising-edge on-time and the stop time or

falling-edge at 5 μS- or 10 μS pulse period with 5 μS pulse width), enter:

F111 PPO XXX:XX:XX:XX.XXXXX0 XXX:XX:XX:XX.XXXXX5<CR>

XL-GPS responds:

OK<CR><LF>

Or, for example, to produce a repetitive 50-microsecond pulse occurring every 100 microseconds (i.e.,

repetitive pulses with 10 kPPS frequency with the start time or rising-edge at 5 μS and the stop time or

falling-edge at 55 μS - or 100 μS pulse period with 50 μS pulse width), enter:

F111 PPO XXX:XX:XX:XX.XXXX05 XXX:XX:XX:XX.XXXX55<CR>

XL-GPS responds:

OK<CR><LF>

Or, for example, to produce a repetitive 50-microsecond pulse occurring every 100 milliseconds (i.e.,

_{repetitive pulses with 10 PPS frequency with the start time or rising-edge at 5 μS and the}5_{stop time or}

falling-edge at 55 μS - or 100ms pulse period with 50 μS pulse width), enter:

F111 PPO XXX:XX:XX:XX.X00005 XXX:XX:XX:XX.X00055<CR>

XL-GPS responds:

OK<CR><LF>

Or, for example, to produce a repetitive one-minute pulse occurring every hour, enter:

F111 PPO XXX:XX:10:00.000000 XXX:XX:11:00.000000<CR>

XL-GPS responds:

OK<CR><LF>

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Or, for example, to produce a repetitive one-microsecond pulse occurring on every hour, enter:

F111 PPO XXX:XX:10:00.000000<CR>

XL-GPS responds:

OK<CR><LF>

F113 – J3 Input (Freq Meas)

Note: Frequency Measurement is an optional feature. If purchased at the same time as the XL-GPS, it

comes enabled on the system. To purchase this option after you have purchased the XL-GPS,

contact Symmetricom Sales. See “H: Sales and Customer Assistance” on page 143.

Use function F113 to configure J3 for a Frequency Measurement (Freq Meas) input, to display

Frequency Measurement information, or to disable J3 inputs.

F113 offers the following keypad settings:

•

J3 Input Configuration: (FREQ MEAS, DISABLED) Displays “Disabled” if the Frequency

Measurement option has not been installed. Displays “Freq Meas” if it has.

J3 Select Function: (DISPLAY FREQ MEAS, J3 INPUT CONFIG) Select to display the Freq Meas

information of to configure the Freq Meas input on J3.

•

J3 Input Frequency: 1 MHz, 5 MHz, 10 MHz (Select the Freq Meas input frequency)

J3 Input Impedance: 1kΩ, 50 Ω (Select the input impedance)

Freq Meas Interval: 1 to 99999 seconds

The factory settings are 10 MHz, and 1kΩ.

Frequency Measurement (Freq Meas) Input

The Frequency Measurement (Freq Meas) option measures an external frequency applied to the J3

input relative to the disciplined XL-GPS oscillator.

Operation: Measurements are displayed on the front panel display and on the command line at the

specified measurement interval. The front panel displays the measured frequency offset (FREQ

OFFSET) and a countdown (COUNT) to completion of the measurement interval. The command line

states the measurement interval (e.g.,“Interval is 1 seconds”) on the first line, and then starts displaying

each measurements; each one on a new line.

Limitations: Note that the accuracy of the frequency measurement is based on the accuracy and stability

of the disciplined XL-GPS oscillator over the measurement interval. Short interval measurements of

external very high stability oscillators (e.g., Cesium) tend to measure the XL-GPS oscillator instead.

Refer to “Time and Frequency Accuracy” on page 3, and to “Oscillators” on page 11 for more information

for the specifications of disciplined oscillators (while locked to a GPS reference source).

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Theory of Operation: Freq Meas uses a heterodyne phase error multiplier to achieve high resolution at

short sample periods. Using its internal disciplined frequency, the XL-GPS records or timestamps the

zero crossing of the J3 input frequency once per measurement cycle with 240 picosecond resolution.

The number of zero crossings between successive measurement intervals is also recorded.

When the measurement interval elapses, the previous measurement timestamp is subtracted from the

current one and the difference is divided by the number of zero crossings between the two timestamps.

The result is the average period of the external frequency over the interval. The reciprocal of this period

is compared to the nominal frequency to determine the fractional frequency offset. The timestamp

reported with the resulting measurement is the ending timestamp of the two phase readings used to

make the measurement. Since this ending timestamp is now the beginning timestamp for the next

measurement, there is no “dead time” in the measurements.

The reported timestamp resolution is sufficient to allow integrating the fractional frequency offset

measurements to fully recover the relative phase of the external frequency source being measured

versus the disciplined XL-GPS internal or external oscillator.

Display: Freq Meas appears as follows in the front panel display/keypad:

FREQ OFFSET

+x.xxxxxx-xx

COUNT

xxxxxx

Where FREQ OFFSET +x.xxxxxx-xxis the fractional frequency offset measurement divided by the

COUNT xxxxxxxmeasurement interval. These measurements are displayed until a new F113

configuration is selected, or another function performed.

Command Line

To display the J3 Input Configuration, enter:

F113<CR>

XL-GPS responds as follows if the Freq Meas option has not been installed:

F113<S>DISABLE<CR><LF>

When the Frequency Measurement option is enabled, F113 responds:

F113<S>FREQ MEAS<S><FREQ><S><IMP><S><INT><CR><LF>

Where the F113 entry and request formats are defined as:

= ASCII character F.

113

= function number.

SHOW

DISABLE

= ASCII character string "SHOW" for displaying frequency measurements.

= ASCII character string "DISABLE" to disable J3 as input port

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= ASCII character F.

FREQ MEAS = ASCII character string "FREQ MEAS" to set J3 to make frequency measurements

<S>

= ASCII space character one or more.

= FREQ MEAS Input Frequency: 1MHZ, 5MHZ, 10MHZ

= Input Impedance: 1K or 50

<FREQ>

<IMP>

<INT>

= Frequency Measurement Interval. This is the gate time of the measurement. Range: [000001,

999999] in seconds.

<CR><LF> = line terminator, either a carriage return and line feed for output strings or a carriage return only for

input strings.

For example, enter:

F113<CR>

The XL-GPS displays the current configuration (example):

F113 DISABLE<CR><LF>

F113 FREQ MEAS 1MHZ 50 000001<CR><LF>

To set the J3 Input Configuration, enter a character string using the same formats as the preceding

XL-GPS responses. Only valid values are accepted.

To disable F113, enter:

F113 DISABLE<CR>

Or, to enable Freq Meas of a 1 MHz input with a 50 Ω input impedance every 1 seconds, enter:

F113 FREQ MEAS 1MHZ 50 1<CR>

To all three of the above examples, XL-GPS responds:

OK<CR><LF>

If enabling Freq Meas, display the Freq Meas measurements using the following format:

F113<S>SHOW<CR>

XL-GPS responds using the following format:

Interval<S>is<S><INT><S>seconds<CR><LF>

+#.######e-##<CR><LF>

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Where

Interval is = ASCII character string “Interval is”

<S>

= ASCII space character or separator.

= Frequency Measurement Interval

= ASCII character string “seconds”

<INT>

seconds

= ASCII plus “+” or minus “-” character

= ASCII integer from 0 to 9

= ASCII characters “e-”

= line terminator, either a carriage return and line feed for output strings or a carriage return

only for input strings

For example, enter:

F113 SHOW<CR>

XL-GPS responds (example):

Interval is 1 seconds<CR><LF>

+9.600000e-10<CR><LF>

+1.080000e-09<CR><LF>

+1.560000e-09<CR><LF>

To stop Freq Meas, enter Ctrl+C on the command line.

Note: Freq Meas remains active while the function is displayed on the front panel or command line.

Changing the function on the front panel or command line terminates Freq Meas.

F117 – Factory Configuration

Use function F117 to display the XL-GPS factory Serial Number and the availability optional software

features. Send the string:

F117<CR>

XL-GPS responds:

F117<S>SN<S><SERIAL#><CR><LF>

NTP <STATE><CR><LF>

FREQ MEAS <STATE><CR><LF>

TIET <STATE><CR><LF>

PPO <STATE><CR><LF>

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where:

= ASCII character F.

= function number.

117

<S>

NTP

= ASCII space character one or more.

= NTP option

FREQ MEAS = FREQ MEAS option

TIET

= TIET option

PPO

= PPO option

<CR>

<STATE>

<LF>

= carriage return.

= ENABLE or DISABLE

= line feed.

For example, enter:

F117<CR>

XL-GPS responds:

F117 SN 31234<CR><LF>

NTP ENABLE<CR><LF>

FREQ MEAS ENABLE<CR><LF>

TIET ENABLE<CR><LF>

PPO ENABLE<CR><LF>

F119 – GPS Receiver Configuration

Summary

Use function F119 to query and configure the 6: GPS M12 Receiver (87-8028-2) (page 109).

F119 provides the following GPS receiver information:

•

Available/Not Available

Part Number

Software Version

FPGA Number

F119 provides the following GPS receiver status:

•

GPS Status (Locked or Unlocked)

GPS Antenna (Ok or Open)

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•

GPS Acquisition State - (Dynamic Mode, Stop Site Survey, Stop TRAIM, Start Site Survey, Start

TRAIM, Survey Position, Position Hold, TRAIM Active)

Operation

Each of F119’s information, status, and configuration items are explained below. Because F119 and the

GPS receiver are important elements of the XL-GPS Time and Frequency System, this section explains

interactions and behavior of the F119, the GPS receiver, and other system functions in some detail.

Part Number, Software Version, and FPGA Number

This information may be useful for identifying the GPS receiver to Symmetricom technical support.

GPS Status (Locked or Unlocked)

During normal operation, “Locked” means the receiver has its current position and the current GPS time.

“Unlocked” means the receiver doesn’t have its current position yet, or that no “good current” satellites

^{are available to provide the current GPS time. For additional information on “good current}1^{” GPS}

satellites, see “F60 – GPS Receiver Satellite List” on page 56.

Note: GPS status can be “Locked” before the GPS receiver is a valid time reference. This is explained

below.

The GPS receiver serves as a UTC time reference for the XL-GPS system clock. To be a valid time

reference, the receiver requires the following information:

•

The GPS time (at least one “good current” GPS satellite)

The current position of the receiver

The UTC leap-second offset

Following power-up and initialization, the receiver requires at least four concurrent “good current”

satellites () to resolve its current position. In rare cases, when a pair of “good current” satellites are on

intersecting paths, the receiver requires additional “good current” satellites or waits for the intersecting

satellites to diverge before resolving the current position. Once resolved, the current position information

is saved.

For additional information on GPS position information, see “F50 – GPS Receiver LLA/XYZ Position” on

page 49.

While resolving its current position, the GPS receiver also listens for the UTC leap-second offset

periodically transmitted by GPS satellites along with GPS time and position information. Up to thirteen

minutes may elapse from the time the receiver acquires its first “good current” satellite to the time it

receives the UTC leap-second offset. Once received, the UTC leap-second offset is saved.

When the receiver has the current position, the UTC leap-second value, and the current GPS time, it

starts providing valid time to the XL-GPS system clock. When the system clock is locked to the GPS time

reference and is operating within specifications, the system status is locked. The interval from

initialization to system status lock is typically under twenty minutes, under nominal conditions. This

transition is illustrated below.

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Following initialization, the front panel display of an XL-GPS with only one GPS receiver (GPS Status:

Unlocked) would show the following:

UNLOCKED

LOCAL

* GPS PRI

365:16:01:05 1969

With the GPS receiver as a valid time reference, the following changes would take place:

•

The asterisk (“*”) indicating the absence of a valid reference would disappear

The system status would change to locked

The front panel status display would look like this:

LOCKED

LOCAL

GPS PRI

233:18:21:29 2005

Once the GPS receiver is a valid time reference, it requires at least one “good current” satellite to remain

a valid time reference. If “good current” GPS satellites become temporarily unavailable, GPS status

changes to unlocked and the XL-GPS stops using the receiver as a valid time reference.

Typically, when a “good current” satellite becomes available again, GPS status locks and the receiver

becomes a valid time reference almost immediately. Typically, the receiver it does not need extra time to

resolve its current position unless it is being used in a very mobile/dynamic environment such as an

aircraft.

If the unit is powered-cycled, the receiver repeats the complete position and leap-second acquisition

process before GPS status locks.

Note: GPS satellite visibility and signal strength affect the ability of the GPS receiver to lock and provide

valid time to the XL-GPS. Therefore, it is very important to select the best possible antenna site

and follow the recommendations in sections “Installing the GPS Antenna” on page 13, and.

GPS Antenna (OK or Open)

The GPS antenna is powered by a 12-volt current from the ANTENNA connector on the rear of the XL-

GPS. If this circuit is complete (e.g., connected to an antenna) GPS Antenna status is OK. If the circuit is

incomplete (e.g., no antenna, a cable break, or a splitter) the GPS Antenna status is Open. If circuit

detects a short, the receiver opens a relay to disconnect power from the circuit, and the GPS Antenna

status is Open.

GPS Acquisition State

In Time Mode: The system has been instructed by the user that its position will remain in a static location

and has set the GPS mode to Time Mode. See “F53 – GPS Operation Mode” on page 55.

•

Start Site Survey: The receiver is checking for changes in its saved static position (occurs after

boot).

•

Survey Position: If the save static position is determined to be invalid, the receiver begins to

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reestablish its current most accurate position.

•

Position Hold: The receiver has determined its most accurate position, and is using this static

position to calculate its most accurate time solution.

•

Start TRAIM: (for Time Receiver Autonomous Integrity Monitoring) The receiver is in Position

Hold and is monitoring the integrity of the time solution using redundant satellite measurements

in order to eliminate unreliable signal information.

TRAIM Active: The TRAIM mode is active and working.

In Dynamic Mode: The system has been instructed by the user that its position could change and has set

the GPS mode to Dynamic Mode (see “F53 – GPS Operation Mode” on page 55):

•

Stop Site Survey: The receiver has finished checking for changes in its static position.

Stop TRAIM: The receiver has completed TRAIM monitoring.

Dynamic Mode: The position is being resolved on an ongoing basis.

Command Line

To obtain the status of the GPS Receiver, enter:

F119<S>S<CR>

For example, enter:

F119 S<CR>

XL-GPS responds (example):

F119 :<CR><LF>

GPS PART NUMBER 87-8028-2<CR><LF>

SOFTWARE 230-01510-04v1.9<CR><LF>

FPGA

GPS STATUS LOCKED<CR><LF> (or UNLOCKED)

GPS ANTENNA OPEN<CR><LF> (or SHORT or OK)

230-01510-01<CR><LF>

GPS ACQUISITION STATE: POSITION HOLD (or one of the following:

DYNAMIC MODE,

STOP SITE SURVEY,

STOP TRAIM,

START SITE SURVEY,

SURVEY POSITION,

POSITION HOLD,

TRAIM ACTIVE)

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where:

= ASCII character F.

= function number.

119

<S>

= ASCII space character one or more.

<CR><LF> = line terminator, either a carriage return and line feed for output strings or a carriage return only for

input strings.

XL-GPS responds:

OK<CR><LF>

F126 – Options Key Entry

Use function F126 to enter the Options Key, which enables certain functions (e.g., PPO, TIET, NTP,

FREQ MEAS) if the correct key is entered. To check the status of these XL-GPS options, see “F117 –

Factory Configuration” on page 103. After entering the key code using F126, reboot the XL-GPS.

To set the Options Key code, enter the following:

F126<S><KC><CR><LF>

where:

= ASCII character F (f or F for input string).

126 = the function number

<S> = ASCII space character one or more

<KC> = Key Code, 0 to 999999999999999. A value of all nines will clear all Option enable flags.

<CR> = carriage return character

<LF> = line feed character

For example, enter:

F126<S>5674397586090<CR>

XL-GPS responds:

OK<CR><LF>

Use function F117 to verify that the correct code was entered. Then reboot the unit to activate the

option.

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6: GPS M12 Receiver (87-8028-2)

Introduction

The optional GPS M12 Receiver acts as a Stratum 0 timing reference source to the XL-GPS Time and

Frequency System. It tracks up to 12 L1 GPS satellites, decodes their signals for time and position, and

feeds this data to the XL-GPS through the internal backplane. When available and enabled, the GPS

M12 Receiver card provides superior time and frequency accuracy on the XL-GPS (See “Time and

Frequency Accuracy” on page 3). The GPS M12 Receiver card comes with an L1 GPS antenna, cabling,

and mounting hardware unless otherwise specified at the time of purchase.

The GPS M12 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.

For more information about the M12 receiver, visit http://www.motorola.com/ies/GPS/

products_positioning.html.

See “Installing the GPS Antenna” on page 13 for information on selecting an antenna site, mounting the

antenna, and signal strength requirements.

The GPS M12 Receiver card can be managed and configured using F53 – GPS Operation

Mode (page 55) and F119 – GPS Receiver Configuration (page 104).

Specifications

Frequency

Code

1575.42 MHz (L1 signal)

Coarse Acquisition (C/A) code

Up to 12 satellites with TRAIM

Tracking

Position Accuracy Typically < 10m when tracking four (4) satellites

TRAIM Mask

1 μS

1 PPS Accuracy

Time standard:

Antenna input

Antenna Power

UTC-USNO ±30 nS RMS 100 nS Peak

UTC or GPS

Female BNC

20 mA – 220 mA, +12 V

Related topics:

•

“Installing the GPS Antenna” on page 13

“Verifying Antenna Installation” on page 22

“F50 – GPS Receiver LLA/XYZ Position” on page 49

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•

“F51 – GPS Antenna Cable Delay” on page 52

“F60 – GPS Receiver Satellite List” on page 56

“F69 – Time Mode” on page 61

“F73 – Alarm Control / Status” on page 64

“F90 – Code Output Configuration” on page 72

“F119 – GPS Receiver Configuration” on page 104

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7: XL-GPS-Generated Messages

Error Messages

ERROR 01 VALUE OUT OF RANGE

You entered a command using the correct format that contained a value, probably numeric, that was

outside the range of acceptable values.

Recovery Action: Re-enter the command using an acceptable value.

ERROR 02 SYNTAX

You entered a valid command, but using the wrong format.

Recovery Action: Re-enter the command, using the correct format.

ERROR 03 BAD/MISSING FIELD

You entered a command that lacks a required field.

Recovery Action: Re-enter the command, using the required fields.

ERROR 04 - BAD DATA/TIMEOUT CONDITION

The GPS option card did not respond to the XL-GPS soon enough.

Recovery Action: Re-enter the command, using the required fields.

ERROR: Invalid Command

You have entered an invalid command.

Recovery Action: Consult the manual for the correct command and re-enter.

ERROR: Can’t create netdevice <NAME>

The XL-GPS can not create the device needed to map the host to a drive.

Recovery Action: Restart the Unit. If this error message persists, contact Symmetricom Technical

Customer Service.

ERROR: Can’t set host <NAME> ip <ADDRESS>

You have incorrectly entered a parameter, or there is no room currently in the Host table for another IP

Address.

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Recovery Action: Verify correct parameter values. If correct, restart the XL-GPS. If this error message

persists, contact Symmetricom Technical Customer Service.

ERROR: Action (get or set) is not specified

You have omitted the “get” or “set” parameter from the F100 NTP Configuration command.

Recovery Action: Re-enter the command, specifying the desired action.

ERROR: Can’t open source file <NAME>

The file containing the needed data is unavailable.

Recovery Action: Check file location and directory names to verify the path is accurate, then re-enter the

command.

ERROR: Can’t open dest file <NAME>

The destination file is unavailable.

Recovery Action: Check file location and directory names to verify the path is accurate, then re-enter the

command.

ERROR: Can’t write file <NAME>

Data from the source file cannot be copied to the destination file.

Recovery Action: Check file location and directory names to verify the path is accurate, then re-enter the

command.

ERROR: Configuration failed.

Your attempt to configure new parameters was unsuccessful.

Recovery Action: Verify parameter values, then re-enter the command.

ERROR: Configuration type is not specified

You did not specify the file type.

Recovery Action: Re-enter the command, specifying SNMP and/or NTP.

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Informational Messages

Messages in this section inform you of an event and do not require any action on your part.

Deleted previously set IP host address

Your last action deleted the previously set IP host address.

^{NOTICE: Cannot respond to command because Utility Port session}2^has

priority.

A Utility Port session has started and takes precedence. Wait until it is over before logging in or

expecting a response to an entered Telnet command.

Host <NAME> ip <ADDRESS> configured successfully!

Host configuration was successful.

Source file <NAME> bytes read: <NUMBER>

Source file was successfully read.

Dest file <NAME> bytes written: <NUMBER>

Configuration files transferred successfully!

Information was successfully transferred to the destination file.

Restarting the Unit

Please wait…

A command has just been executed that requires a soft restart of the XL-GPS. The restart happens

immediately after this message is sent.

Command accepted and processed as specified.

Goodbye.

The XL-GPS has just terminated a session.

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A: Using F100 Configuration

Configuring NTP & SNMP Parameters

F100 CONFIG instructs the XL-GPS unit to transfer its NTP and SNMP configuration files to an FTP

server so the user can edit them. When finished editing, the user transfers the config files back to the

XL-GPS using the F100 CONFIG command.

Overview of Steps

•

Set up an FTP server on your workstation.

•

Using the XL-GPS’s command line interface, enter the F100 CONFIG getcommand. The XL-

GPS transfers copies of its configuration files over the network to the FTP on your PC.

•

Edit the configuration files.

Give the XL-GPS a new command, F100 CONFIG set. The XL-GPS retrieves copies of the

edited configuration files from the FTP and overwrites it’s current config files with the newly edited

ones.

Set up the FTP Server

To save time and trouble, download a pre-configured FTP server from http://www.ntp-systems.com/zip/

warftpd1.zip and extract it to the C:\ drive on your workstation. Otherwise, customize your existing FTP

server setup as described in this section.

When performing these operations, the user issues command line instructions to the XL-GPS. The XL-

GPS responds to those commands by connecting to the FTP server and transferring files to and from the

FTP. The XL-GPS gives the FTP server ‘Anonymous’ as its user name, and uses a null password (e.g.,

the equivalent of pressing the Enter key on your keyboard instead of entering text). The FTP server must

be configured as follows:

•

Anonymous log-ins are enabled

The password for Anonymous is disabled, or allows a null password

Anonymous has read/write privileges to Anonymous’s home directory.

Get the IP Address of the FTP Server/Workstation

If the FTP server is running on your Windows workstation, open a DOS command line window on the

workstation:

•

Click Start, Run, and type cmd, or

Click Start, Programs, (and Accessories in some cases), and select Command prompt or DOS

prompt.

•

At the command line, type ipconfig

Make note of the IP Address.

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For other operating systems and configurations, consult the appropriate documentation for obtaining the

FTP server’s IP address.

Copy the Configuration Files to the FTP Server

Telnet to the XL-GPS or open a terminal session to it over the serial port.

Using the command line, enter the commands below. Replace <IP Address>with that of the

workstation/FTP Server. Leave <subdir>blank - the FTP server will save the files in anonymous’s

home directory.

Note: See “Using the Command Line Interface” on page 18 if you need instructions for connecting to the

command line interface

To get the NTP config files, type:

>f100 config ntp get host:<IP Address> dir:<subdir>

To get the SNMP config file, type:

>f100 config snmp get host:<IP Address> dir:<subdir>

To get the SNMP and NTP config files, type:

>f100 config ntp snmp get host:<IP Address> dir:<subdir>

Here’s an example of a successful SNMP and NTP config file transfer:

>f100 config ntp snmp get host:192.168.0.1 dir:

Host config ip 192.168.0.1 already configured

Source file /config/snmp.conf bytes read: 1275

Dest file snmp.conf bytes written: 1275

Source file /etc/ntp.conf bytes read: 1166

Dest file ntp.conf bytes written: 1166

Source file /etc/ntp.keys bytes read: 44

Dest file ntp.keys bytes written: 44

Configuration files transferred successfully!

If you get “Error: Can’t write file” when you enter the get command, verify the following FTP

server items:

•

FTP server is running.

Anonymous has a home directory.

The home directory for Anonymous has read, write, and delete enabled (make sure to apply

changes).

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Edit the Configuration Files

In Windows, edit the configuration files using a text editor such as Notepad or Wordpad. For more

information, see “D: Network Time Protocol (NTP)” on page 135.

If using the preconfigured FTP server (downloaded from http://www.ntp-systems.com/zip/warftpd1.zip),

the FTP places the configuration files in C:\Symmetricom, the default or home directory of “anonymous”.

Note: Follow these guidelines when editing the configuration files:

•

If the editor displays odd 'box' characters or the lines of text don't wrap properly, close the file

without saving changes and switch to a different text editor.

•

Don't rename or save the configuration files as a new file type.

Some text editors encode end-of-line carriage returns that cause errors when XL-GPS refers to

the file. Notepad, WordPad, Microsoft Word, and Vim don't seem to have this problem.

•

The configuration files are automatically transferred to/from the FTP server in binary format.

They retain the DOS or UNIX file conventions of the editor. XL-GPS works with either format.

Move the Configuration Files Back to the XL-GPS

Reboot Warning: The following steps cause the XL-GPS to reboot.

Using the XL-GPS’s command line, enter one of the commands below, replacing

<IP Address> with the IP address of your workstation/FTP server.

To move the NTP config files, type:

>f100 config ntp set host:<IP Address> dir:<subdir>

To move the SNMP config file, type:

>f100 config snmp set host:<IP Address> dir:<subdir>

To move the NTP and SNMP config files, type:

>f100 config ntp snmp set host:<IP Address> dir:<subdir>

Here’s an example of a successful SNMP and NTP config file transfer:

>>f100 config set ntp snmp host:192.168.0.1 dir:

Host config ip 192.168.0.1 already configured

Are you sure(y/N)?y

Source file snmp.conf bytes read: 1275

Dest file /config/snmp.conf bytes written: 1275

Source file ntp.conf bytes read: 1166

Dest file /etc/ntp.conf bytes written: 1166

Source file ntp.keys bytes read: 44

Dest file /etc/ntp.keys bytes written: 44

Configuration files transferred successfully!

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Resetting...

If you get “Error: Can’t open source file”, verify that the FTP server’s <<Local Server>> is

running.

After XL-GPS receives the configuration files, it reboots, and goes through the normal startup process.

End of Procedure

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B: Upgrading System Firmware

Caution: Consideration must be given to the firmware and the hardware version numbers of the XL-GPS and it’s optional

components. Consult with Symmetricom’s Customer Service department before performing upgrades.

This section explains how to completely upgrade the system firmware. This is done using the F100 BH,

F100 BUB, F100 BU, and F100 BF commands.

Overview of Procedure

•

Set up a network connection between your XL-GPS and the FTP server.

Set up an FTP Server with the firmware upgrade files.

Open a command line session to the XL-GPS.

Install the firmware version 8 files.

Reboot the XL-GPS.

Note: If your system’s NTP and SNMP configuration files (ntp.conf, ntp.keys, snmp.conf) have been

customized, make backup copies and later re-install those configuration files. See “A: Using

F100 Configuration” on page 114.

Set up the FTP Server

To save time and trouble, download a preconfigured FTP server from http://www.ntp-systems.com/zip/

warftpd1.zip and extract it to the C:\ drive on your workstation. Otherwise, customize your existing FTP

server setup as described in this section.

When performing these operations, the user issues command line instructions to the XL-GPS. The XL-

GPS responds to those commands by connecting to the FTP server and burning the software to system

memory. The XL-GPS gives the FTP server ‘Anonymous’ as its user name, and uses a null password

(e.g., the equivalent of pressing the Enter key on your keyboard instead of entering text). The FTP

server must be configured as follows:

•

Anonymous log-ins are enabled

The password for Anonymous is disabled, or allows a null password

Anonymous has read/write privileges to Anonymous’s home directory.

Obtain the current system firmware files (E.g., 192-8001.bin, 192-8000.bt, 192-8002.fs) from

Symmetricom’s customer support website.

Place the system firmware upgrade files in home directory of the ‘anonymous’ user. If you’re using the

preconfigured FTP server, C:\Symmetricom is the default or home directory.

Open a Command Line Session on the XL-GPS

Note: The XL-GPS and FTP server need to be connected by a TCP/IP network. Ideally they should be

on an isolated subnet. Connecting them over a network with multiple ‘hops’ or one with heavy

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network traffic raises the possibility that the system software files could be corrupted, yielding the

XL-GPS inoperable.

Telnet to the XL-GPS over the network. For example, at your workstations command line, type “telnet

192.168.46.10”.

When prompted, log in to the unit using the operator’s username and password; the user name and

password are usually “operator” and “janus”.

Upgrade the Firmware

Command Format

When issuing the firmware upgrade commands, use the following format:

F100 <command> <ftp_server_ip_address> <relative_path>/<file.ext>

If the FTP server is on your workstation, <ftp_server_ip_address>is the IP address of your

workstation.

<relative_path>is a subdirectory inside the anonymous user’s home directory on the FTP server. If

there is no subdirectory (i.e., if the upgrade files are sitting in anonymous user’s home directory), drop

<relative_path>from the command line.

For example, if c:/ftpworkfiles is the anonymous user’s home directory, and the upgrade files are in c:/

ftpworkfiles/XL-GPS/, you would enter the command as follows:

F100 bh 192.168.49.120 XL-GPS/192-8000.bt

On the other hand, if the files are in c:/ftpworkfiles, the anonymous user’s home directory, you would

drop the <relative_path>and enter the command as follows:

F100 bh 192.168.49.120 /192-8000.bt

Issuing the Upgrade Commands

Adapt the following examples as needed to match your system, such as differences in IP address,

path, and filename).

Enter the following command:

F100 bh <IP_address> <relative_path>/<file.bt>

For example:

F100 bh 192.168.49.120 /192-8000.bt

XL-GPS responds:

BURN HOST IS READY<CR><LF>

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Then ‘burn’ the bootloader to the XL-GPS’s flash memory by entering:

F100 bub

XL-GPS responds:

BURNING FILE 192-8000.bt WITH SIZE 452164 TO PARTITION:0 SECTOR:0

SEC: 0 RE: 0

SEC: 1 RE: 0

SEC: 2 RE: 0

SEC: 3 RE: 0

SEC: 4 RE: 0

SEC: 5 RE: 0

SEC: 6 RE: 0

FLASH SUCCESSFULLY PROGRAMMED CRC32 = 0x9EFBE60A

Do the same for the ‘firmware’ (.bin) file:

F100 bh <IP_address> <relative_path>/<file.bin>

For example:

F100 bh 192.168.49.120 /192-8001.bin

XL-GPS responds:

BURN HOST IS READY<CR><LF>

Then enter:

F100 bu

XL-GPS responds:

BURNING FILE 192-8001.bin WITH SIZE 803016 TO PARTITION:1 SECTOR:10

SEC: 16 RE: 0

SEC: 17 RE: 0

SEC: 18 RE: 0

SEC: 19 RE: 0

SEC: 20 RE: 0

SEC: 21 RE: 0

SEC: 22 RE: 0

SEC: 23 RE: 0

SEC: 24 RE: 0

SEC: 25 RE: 0

SEC: 26 RE: 0

SEC: 27 RE: 0

SEC: 28 RE: 0

FLASH SUCCESSFULLY PROGRAMMED CRC32 = 0x2D9A260A

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Then do the same for the ‘file system’ (.fs) file:

F100 bh <IP_address> <relative_path>/<file.fs>

For example:

F100 bh 192.168.49.120 /192-8002.fs

XL-GPS responds:

BURN HOST IS READY<CR><LF>

Then enter:

F100 bf

XL-GPS responds:

BURNING FILE 192-8002.fs WITH SIZE 524288

SEC: 94

SEC: 95

SEC: 96

SEC: 97

SEC: 98

SEC: 99

SEC: 100

SEC: 101

SEC: 102

Then enter “K (space) I (space) L (space) L” as shown here:

F100 K I L L

The “K I L L” command reboots your unit. You have completed the firmware upgrade procedure

Troubleshooting

Most problems upgrading the firmware are due to problems with the configuration of the FTP server,

such as:

•

setting the server to accept a null password

configuring the anonymous home directory

setting the correct access rights

entering the correct relative file path

The following error messages may provide some indication of the underlying problem:

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Message: >Can't set the burn host - wrong IP address

Cause: The IP address entered for the FTP server is incorrect. Check that you've entered the IP address

of the FTP server (not the XL-GPS) and re-enter if necessary.

Message: >Can't open file: 192-####.##

Cause: There's a problem with the FTP server that is preventing access to the file. Verify the following:

•

The FTP server is correctly configured.

The anonymous user account is enabled.

The anonymous user account password is "guest".

The anonymous user account has read access to the ftpworkfiles directory.

The ftpworkfiles directory located in the anonymous user's home directory.

The FTP server is running.

There aren’t any other ‘anonymous’ users logged into the FTP server.

Try connecting to the FTP server as ‘anonymous’ using an FTP client. You should automatically see the

product name directory (e.g., “XL-GPS”) you created inside the anonymous users home directory (e.g.,

“c:\ftpworkfiles\”). Open the product name directory. You should see the firmware upgrade files you put

there. If either the product name directory or the firmware upgrade files aren’t visible, there’s a problem

with the FTP configuration.

Message: >Wrong File type

You may be using the wrong firmware files for the product being upgraded. This may be due to the

incorrect files being place in the upgrade directory. It may also be that the wrong directory was entered

(one for another product) in the path information on the F100 command line. ‘Wrong file type’ is also

associated with ‘Can’t open file’ errors - see the preceding message.

Message: Unit hangs on “Burning Boot” message.

Check that your IP Address, Subnet Mask, and Default Gateway of the XL-GPS are correctly configured.

FAQ

How does one check the unit’s firmware version number?

Log on to the XL-GPS and enter the following command:

> F100 VER

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An example XL-GPS response is:

F100 VER

BOOTLOADER

SOFTWARE

192-8000

192-8001

FILE SYSTEM 192-8002v1.80

NVRAM VER

PROJ REV

#1.80

The “PROJ REV” number is the firmware version number. The “v” number in “FILE SYSTEM” is the file

system version number, which may not be the same as the firmware version number.

How does one check the IP address, subnet mask, and default gateway of the

XL-GPS?

Log on to the XL-GPS and enter the following command:

> F100 IC

F100 IP:192.168.47.156 SM:255.255.255.0 G:192.168.47.1

Is the null modem cable necessary? What if I’m upgrading a XL-GPS

remotely?

The null-modem cable is optional. If you decide to Telnet to the XL-GPS over TCP/IP network, you don’t

need the null modem cable.

I’m using a null modem cable to connect to the XL-GPS from my laptop and

the XL-GPS keeps rebooting?

An ungrounded voltage level on one of the pins in the null modem cable causes the unit to reset. Use

one of the following work-arounds:

•

Connect the laptop to a grounded power supply, if it has one, or ground the laptop’s chassis.

Do away with the null modem cable. Telnet to the unit over the network.

Use a regular PC instead of the laptop. The PC is connected to a grounded power supply and doesn’t

cause this problem.

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C: SNMP

The mibs for this product are available on the product CD.

Key:

MIB=/config/ttmib.o, Don’t touch. This is a factory setting.

GenTraps=YES,

Global enable/disable setting for all SNMP traps. YES, the default setting,

enables all traps. NO disables all traps. This setting overrides all the other TRAP

parameter settings.

NAME =

VIND =

The community name password. This should be the same as the community

name being used by the administrators.

View Index. This is a reserved term that has no effect and is currently unused in

SNMP. This parameter should be set to “1”.

TRAP =

YES enables/NO disables SNMP traps for a particular community.

ACCESS =

Read and write privileges to members of a community. R sets read only

privileges, and W sets read and write privileges.

IP =

Provide the IP address of the SNMP management stations within that

community. These addresses are required in order for the management station

to receive SNMP traps and to communicate with the XL-GPS system using

SNMP.

Note: A special address of 255.255.255.255 grants any IP addressed unit

access to the Enterprise MIB variables.

SNMP Private Enterprise MIB Structure

This section describes the top level structure & design of the XL-GPS SNMP Private Enterprise MIB.

SNMP Addressing

SNMP addressing is structured as a very large tree database. A root node address is an integer value

that ranges from 0 to some very large number. Conceptually, there are no limits to the numbers of sub

nodes either. SNMP addressing is written in “doted decimal” notation. For example the address of

Symmetricom’s ntpInPkts Enterprise MIB variable is “1.3.6.1.4.1..1896.6.1.2.1.1.0”. The address

fragment 1.3.6.1.4.1 is fixed by the IANA (Internet Assigned Number Authority) and is the address of the

SNMP Private Enterprise MIB’s. The 1896 is the address assigned by IANA to Symmetricom for our

Enterprise MIB’s. Symmetricom assigns the addresses after that at our discretion and design.

New Top Level Structure of Enterprise MIB for XL-GPS

The former address structure of Symmetricom’s Enterprise MIB is as follows:

Symmetricom = 1896

TrapMsg = 1

ntp = 2

ntsControl = 3

gps = 4

acts = 5

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For the XL-GPS, groups 1, 2, 3, 4 and 5 have been deprecated and a new group 6, products, has been

added. For the XL-GPS and future Symmetricom products, groups 1 through 5 will be absent from the

XL-GPS Enterprise MIB definition supplied with the unit. The top structure for the XL-GPS is:

TrueTimeEnt

= 1896

products

= 6

Additional

Products

xli

= 1

xliSystem

= 1

xliTrap

= 0

xliMainCard

= 2

xliOptionCards

= 3

Additional

Option

systemFault

= 1

ntp

= 1

systemStatus

Cards

systemStatus

General

= 1

systemAlarmData

= 1

systemFault

Config

systemStatus

Detail

= 2

systemFault

History

= 3

Note: For the figures in this chapter, substitute “xlgps” for “xli”.

The level under the XL-GPS group is divided into three groups; the first two of which will be explained

later. The optionCardGroup has all the available option cards under it.

The current traps message group is located under the fault. The ntp group is under the xlGpsMainCard

group as an option, and is related only to NTP on the standard network port on the XL-GPS’s Main CPU

card.

This MIB structure also provides a useful definition for the system object ID. SNMP managers may use

the system object ID to identify the class of object being accessed. With this structure, the system object

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ID is defined as Symmetricom.products.xlGps for the XL-GPS product and Symmetricom.products.xxx

for all subsequent products.

XL-GPS System Group

The xlGpsSystem system group contains the systemFault and the systemStatus groups. These groups

contain information describing the operation of the XL-GPS system as a whole. The systemFault group

contains information concerning system faults that have occurred, as well as configuration parameters

for the generation of system alarms, called traps in SNMP, resulting from those faults. The systemStatus

provides two different views of the operational system. The first is a general view specifying if the clock is

operational. The second is a detailed view containing the current status of each system component. The

systemFault and systemStatus groups are described below.

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The XL-GPS Fault Group

xliS ystem

= 1

system S tatus

= 2

system F ault

= 1

system F ault

H istory

= 3

system A larm D ata

= 1

faultP llS ynthesizer

faultLpnP ll

faultP rim aryG P S

faultS econdaryG P S

faultIR IG

= 1

= 2

= 3

= 4

= 5

= 6

= 7

= 8

= 9

alarm D ataIpA ddr

alarm D ataT im eS tam p

alarm D ataC ode

alarm D ataS tatus -

D escriptor

= 1

= 2

= 3

= 4

faultA uxR ef

faultP rim aryP ow er

faultS econdaryP ow er

faultR bO sc

faultT im eE rrorT hreshold = 10

faultC lockLockS tatus

faultO scillatorT uning

system F ault

C onfig

= 11

= 12

= 2

system F ault

C onfigD ata

= 1

system F ault

C onfigM asks

= 2

configD ataLatch

= 1

m askP llS ynthesizer

m askLpnP ll

m askP rim aryG P S

m askS econdaryG P S

m askIR IG

= 1

= 2

= 3

= 4

= 5

= 6

= 7

= 8

= 9

configD ataLatchC lear

configD ataT hreshold

configD ataT im eout

configD ataP ow erO n -

S uppress

= 2

= 3

= 4

= 5

m askA uxR ef

m askP rim aryP ow er

m askS econdaryP ow er

m askR bO sc

m askT im eE rrorT hreshold = 10

m askC lockLockS tatus

m askO scillatorT uning

= 11

= 12

Note: For the figures in this chapter, substitute “xlgps” for “xli”.

The XL-GPS systemAlarmData group defines SNMP traps and cannot be directly retrieved by the SNMP

manager. When a system alarm event occurs an SNMP trap alarmSystemNotification is sent to the

SNMP managers previously configured to receive traps. Included in the trap message are the variables

contained in the systemAlarmData group: IP address, timestamp, alarm code, and the F73 status string.

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The systemFaultConfig sub-group contains parameters to control the generation of system alarms. The

timeout, threshold and power on suppress values are contained in the systemFaultConfigData group.

Also in this group is a method object configDataLatchClear. By setting this object the user clears all

latched faults. Reading the configDataLatchClear object has no effect and its value is not defined. The

systemFaultConfigMasks group contains masks for each possible system alarm event. When the status

changes, for example if the primary GPS becomes unlocked, the associated mask is checked. Only if

the mask is enabled will a system alarm be generated.

The systemFaultHistory group contains latched status indicators for each of the system alarm events. If

a system alarm event goes into fault status, even if this status is transient, then the associated entry in

the systemFaultHistory group will maintain a record of that fault occurrence until the latch is cleared,

using the configDataLatchClear object, resetting all systemFaultHistory entries.

The XL-GPS System Status Group

xliSystem

= 1

systemFault

= 1

systemStatus

= 2

systemStatus

General

= 1

systemStatus

Detail

= 2

statusClockCurrent

statusClockSource

statusDescriptorStr

= 1

= 2

= 3

statusPllSynthesizer

statusLpnPll

statusPrimaryGPS

statusSecondaryGPS

statusIRIG

= 1

= 2

= 3

= 4

= 5

= 6

= 7

statusAuxRef

statusPrimaryPower

statusSecondaryPower = 8

statusRbOsc = 9

statusTimeErrorThreshold= 10

statusClockLockStatus

statusOscillatorTuning

= 11

= 12

Note: For the figures in this chapter, substitute “xlgps” for “xli”.

The XL-GPS systemStatus group is used to provide a current operational view of the system. The

systemStatusGeneralGroup gives on overview of the system status, including the status of the clock and

the reference clock source. The systemStatusGeneralGroup also contains the statusDescriptorStr object

that returns a text string identical to the output of the F73 command on the command line interface. The

systemStatusDetail group contains objects describing the current status of each system object. See the

graph above and refer to the xlGpsSystem-SMIv2.mib MIB for a complete description of each object.

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XL-GPS MainCard Group

xliM ainCard

= 2

ntp

= 1

ntpInP kts

ntpO utP kts

= 1

= 2

ntpInE rrors

= 3

ntpA uthFail

= 4

ntpDesiredAcc

ntpE stE rr

= 5

= 6

ntpS ysLeap

= 7

ntpS ysHostM ode

ntpS ysS tratum

ntpS ysP recision

ntpS ysRootDelay

ntpS ysRootDisp

= 9

= 10

= 11

= 12

= 13

ntpS ysRefClockIdent = 14

Note: For the figures in this chapter, substitute “xlgps” for “xli”.

At present the xlGpsMainCard group contains only the NTP subgroup as shown above. Refer to the

xlGpsMainCard-SMIv2.mib MIB definitions for a description of each of the NTP statistics.

XL-GPS Traps

The trap for the XL-GPS product are defined under Symmetricom.products.xlGps.xlGpsTrap. This is

required to maintain compatibility with MIBS defined using the Structure of Management Information

version 2 definitions.

The XL-GPS SNMP agent will send SNMP version 1 traps. This is done to maintain compatibility with

SNMPv1 managers.

The trap presently defined is: alarmSystemNotification

The alarmSystemNotification trap is sent when the state of an object in the systemStatusDetail group

changes and the corresponding mask object in the configDataMasks group is enabled.

Future Expansion

This section outlines the possibilities for future expansion of the Symmetricom Enterprise MIB. The

general overview is that new objects may be added to any location. Existing objects may not be altered

in order to maintain backward compatibility. There are two varieties of expansions to consider: additional

products and additional features within an existing product.

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This model makes adding additional products and maintaining compatibility a straightforward process.

Each additional product will be given a branch in the tree under enterprises.SymmetricomTtm.products.

For now, we have only enterprises.SymmetricomTtm.products.xlGps and

enterprises.SymmetricomTtm.products.nic56k.

Future products will take the form enterprises.SymmetricomTtm.products.product.XXX. Each product

will use enterprises.SymmetricomTtm.products.product.XXX as its system object identifier. Each product

will also define an enterprises.SymmetricomTtm.products.product.XXX.xxxTrap subgroup for the

definition of all enterprise specific traps that can be generated by that product.

Making additions to the XL-GPS product MIB is also a straightforward task with several caveats. The first

is that additions may be made but the object identifier and the semantics of existing objects may not be

altered. A likely place for additions is under the systemStatusDetail group as addition system objects are

defined.

Glossary of SNMP-Related Terms

Depreciation: In SNMP when an SNMP variable or group of variables is no longer recommended for

use, they are listed as deprecated in the formal definition of the MIB. Users are often times still allowed

to use this data, but the MIB’s authors for one reason or another no longer recommend it.

Enterprise MIB: See Private Enterprise MIB.

IANA - Internet Assigned Number Authority: This is the group at IETF that is in charge of assigning

Internet related numbers like Ethernet addresses, TCP/UDP port numbers and SNMP Private Enterprise

MIB numbers.

IETF – Internet Engineering Task Force: The group responsible for standardizing numerous Internet

communication protocols.

Management agent: An Internet connected remote host that accumulates the raw data that is entered

into the MIB and Enterprise MIB for that host. This data is at some point transmitted to a Management

station. In other network applications this would be called a network server of the SNMP protocol.

Management station: An Internet connected remote host that consumes SNMP data provided by a

Management agent for the display of human network managers. In other network applications this would

be called a client of the SNMP protocol.

MIB – Management Information Base: This is the data structure for the SNMP protocol. The current

version of this standard, that is in general use, is MIB II defined by RFC’s 1213 and 1212.

NTP – Network Time Protocol: A network time distribution protocol developed at the University of

Delaware under the direction of Dr. Mills. NTP is a client / server based protocol where the server is the

supplier of time and the client is the consumer of the time information.

Private Enterprise MIB: SNMP allows private organizations to define their own MIB extensions. The

IANA of the IETF issues, for a fee, a unique number to an organization that is an address entry point

from the MIB II into the private data for that organization. Only one Enterprise address is assigned to an

organization. The Enterprise address for Symmetricom is 1896. This address space has grown to over

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12,000 private addresses and Symmetricom is by comparison one of the earlier adopters of SNMP with

an Enterprise MIB!

RFC – Request for Comments: A document reviewed and released by the IANA that defines the formal

definitions of various Internet communication protocols and related information.

SNMP – Simple Network Management Protocol: This Internet communications protocol is used for

the status and control of remote network devices. Numerous IANA standards committees starting in

1990 and continuing to day define this protocol.

Trap or Trap Message: A packet issued from an SNMP Management agent to an SNMP Management

station. The message is intended to relay and important even that occurred within the agent that requires

attention or notification.

Configuring and Testing SNMP

This section outlines the procedure to perform verification tests on the SNMP component of the XL-GPS

product.

Prerequisite: XL-GPS unit, PC with HP OpenView installed, located on the same subnet.

HP OpenView Configuration

Create the Network Map

Power on the XL-GPS unit.

Log on to the PC with HP OpenView installed as the “Administrator” user.

Start the HP OpenView Network Node Manager application.

Select the menu item Map->New

In the “Name” field, enter “xlGpsTestMap”

Click the <Next> button 3 times and the <Finish> button 1 time to complete the Map definition and

open the Map.

Load the Symmetricom Enterprise MIBs

Select the menu item Options−>Load/Unload MIBs: SNMP. A dialog box titled “Load/Unload

MIBs:SNMP” will pop up.

In the dialog box click the <Load> button to load the MIBS: symmetricomTtm-SMIv2.mib, xlGps-

SMIv2.mib, xlGpsMainCard-SMIv2.mib, and xlGpsSystem-SMIv2.mib.

When xlGpsSystem-SMIv2.mib is loaded a dialog box with the title “Load Trap-Type/Notification-

Type macro?” will appear. Click the <OK> button to add the trap definition into the OpenView event

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system. Click the <OK> button again to confirm the action.

Click the <Close> button to exit the “Load/Unload MIBs:SNMP” dialogue box.

Configure Traps

Select the menu item “OptionsEvent Configuration”. A pop window titled “Event Configuration” will

appear.

In the “Event Configuration” window, scroll through the “Enterprises” list to the bottom and select

“XL-GPS”.

In the “Events for Enterprise XL-GPS” select the “alarmSystemNotification” entry. Then select the

menu item “Edit->Events->Modify…”. A popup titled “Modify Events” will appear.

In the “Modify Events” popup click the “Event Message” tab. Under “Actions” select the “Log and

display in category”. In the “Event Log Message” field, enter “XL-GPS System Trap: $*”. Do not en-

ter the quotation marks.

Select the menu item “Options->MIB Application Builder: SNMP”. A popup titled “MIB Application

Builder: SNMP” will appear.

In the “MIB Application Builder: SNMP” popup select the menu item “Edit->New…” A popup titled

“New MIB Application” will appear.

Enter “xlGpsStatus” in the “Application ID:” field and the “Application Title:” field. Leave “Application

Type:” as “Form”. Click the “Next” button.

The title of the popup will now be “New Application Builder – Display Fields”. Click the “Add” button.

A popup titled “New Application Builder / Add MIB Objects will appear”.

In the “New Application Builder / Add MIB Objects will appear” popup descend the MIB tree by click-

ing on the plus symbol next to the entries “iso -> org -> dod -> private -> enterprises -> symmetri-

comEnt -> products -> xlGps -> xlGpsSystem -> systemStatus -> systemStatusGeneral”. Select all

items under “systemStatusGeneral”. Do this by clicking on the first item and then holding the “shift”

key while clicking on the last item. Then click the “Add” button. Back up to “xlGps -> xlGpsSystem

-> systemStatus -> systemStatusDetail”. Select all items under “systemStatusDetail” and then click

the “Add” button. Then click the “Close” button.

10. In the “New Application Builder – Display Fields” popup click the “Next” button. In the “Menu Path”

field enter “xlGps->Status”. Click the “Finish” button.

11. Repeat steps 6 – 10 using the “Application ID:” of xlGpsConfig selecting all items under “iso -> org

-> dod -> private -> enterprises -> symmetricomTtm -> products -> xlGps -> xlGpsSystem -> sys-

temFault -> systemFaultConfig” and using the “Menu Path” of “xlGps->Configuration”.

12. Repeat steps 6 – 10 using the “Application ID:” of xlGpsFault selecting all items under ““iso -> org

-> dod -> private -> enterprises -> symmetricomTtm -> products -> xlGps -> xlGpsSystem -> sys-

temFault -> systemFaultHistory” and using the “Menu Path” of “xlGps->Fault History”.

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Additional OpenView configuration

Select the menu item “Options->SNMP Configuration”. A popup titled “SNMP Configuration” will ap-

pear.

In the “SNMP Configuration” popup: set the “Community” field to “public” the “Set Community” field

to “private” and the “Retries” field to 0.

XL-GPS Configuration

SNMP Configuration

Follow the manual to load the snmp.conf configuration file into the XL-GPS. The IP address of the HP

OpenView PC must be in both the public and private communities.

Test Procedure

Testing “Get”

From the Network Node Manager root level double click the icon “Internet”. Select the icon corre-

sponding to your test subnet, e.g. “192.168.11”, and double click. Double click the “Segment1” icon.

Select the icon labeled “NIC” by single clicking with the mouse.

Select the menu item “xlGps->Status”, “xlGps->Configuration”, then “xlGps->Faults”. Verify the val-

ues by comparing with the output of the keypad display.

Testing “Set”

Follow “Get Testing” procedure steps 1-2.

Select the menu item “Tools->SNMP MIB Browser”. A popup titled “Browse MIB” will appear.

In the “Browse MIB” popup descend the MIB tree to “iso -> org -> dod -> private -> enterprises ->

symmetricomTtm -> products -> xlGps -> xlGpsSystem -> systemFault -> systemFaultConfig ->

systemFaultConfigMasks” by clicking the “+” symbol next to each entry.

In the “Browse MIB” popup select the “maskPllSynthesizer” entry. In the “MIB Instance” field type 0.

In the “SNMP set value” field type 1. Click the “Set” button.

Verify that a popup appears saying “Set has completed successfully”.

Select the menu item “xlGps->Configuration”. In the popup “xlGpsconfig” verify that the “maskPll-

Synthesizer” entry is set to “disabled”.

In the “Browse MIB” popup select the “maskPllSynthesizer” entry. In the “MIB Instance” field type 0.

In the “SNMP set value” field type 2. Click the “Set” button.

Verify that a popup appears saying “Set has completed successfully”.

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Select the menu item “xlGps->Configuration”. In the popup “xlGpsconfig” verify that the “maskPll-

Synthesizer” entry is set to “enabled”.

10. Repeat steps 4-9 in turn for each additional entry under systemFaultConfigMasks.

Trap Testing

1. Perform an action to generate a trap.

2. Select the menu item “Fault->Alarms”.

3. Verify in the “All Alarms” popup that there is an entry of the form:

Normal Thu Mar 21: 14:30.09 192.168.11.218 XL-GPS system trap:

[1] private.enterprises.symmetricomTtm.products.xlGps.alarmDataIpAddr.0 (IpAddress)

192.168.11.218

[2] private.enterprises.symmetricomTtm.products.xlGps.alarmDataTimeStamp.0

(OctetString): HH:MM:Ss UTC

[3] private.enterprises.symmetricomTtm.products.xlGps.alarmDataCode.0 (Integer):

alarmPrimaryPower

[4] private.enterprises.symmetricomTtm.products.xlGps.alarmDataDescriptorStr.0

(OctetString): F73 S LP LL----PSR---

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D: Network Time Protocol (NTP)

As an option, Symmetricom can factory configure the XL-GPS to function as a Stratum 1 network time

server. Network time servers use Network Time Protocol (NTP) to synchronize computer clocks across a

network. Alternatively, customers can upgrade a XL-GPS unit in the field by purchasing the NTS option

and installing a key to enable it.

Support for version 4.0 of the NTP, RFC 1305 as well as the Simple Network Time Protocol (SNTP),

RFC2030 is available. In addition, the XL-GPS responds to TIME protocol requests, RFC868.

The Network Time Server responds to time synchronization requests from hosts using these User

Datagram Protocol/Internet Protocols (UDP/IP):

Type/Protocol

Port Number

RFC

NTP ver. 4.0:

SNTP:

UDP Port 123

UDP Port 37

RFC1305

RFC2030

RFC868

TIME:

NTP Packet Transmitted Timestamp Accuracy ±10 milliseconds.

Editing ntp.conf

Note: The XL-GPS is a Stratum 1 NTP server. Therefore, it does not support NTP peering, in which a

time server gets time information by sending an NTP query to another time server. Entering valid

IP addresses for the ‘server’ parameters (e.g., “server 216.210.169.40”) in ntp.conf does not

enable peering in the XL-GPS.

The current text of “ntp.conf” is as follows:

# X L - G P S N T P . C O N F

# Load this version into the XL-GPS NTP Server for NTP MD5 and NTP broadcast

# The line below to enables NTP broadcast mode using MD5 key 1.

broadcast

192.168.47.255

key 1

# Trust and accept NTP packets using MD5 keys 1 or 2.

# The MD5 keys and key ID specified in the XL-GPS's NTP.KEYS file must match the

# same ones in the UNIX/Linux client NTP.KEYS file. The same keys for both

# units must be specified as trusted by the line below.

trustedkey

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Editing MD5 keys on the XL-GPS

NTP keys are needed if you are using NTP in broadcast mode with MD5 authentication. This (and the

following) section provide configuration guidelines. For additional information, consult Dr. Mills NTP site

at: http://www.ntp.org

Broadcast mode adjusts its periodicity according to feedback from its broadcast client. The periodicity

will typically settle-out to about every 2 minutes. This activity is not adjustable.

MD5 private keys have to be edited on both the NTP server and the NTP client. The private keys are

defined in the “ntp.keys” file.

The NTP client “ntp.keys”file is identical to the one on the NTP server. For the specific keys

used by the NTP server, the NTP client must have the identical line in its version of the file. You’ll want to

use your own hard-to-guess key names, using random letters. The critical lines of the “ntp.keys” file are:

M symmetricom

M TTXL-GPS

where:

•

“1” and “2” are the key identifiers

“M” specifies MD5 authentication, the only type available

“symmetricom” and “TTXL-GPS” are the arbitrarily chosen keys

The first column is the key identification number, which may range in whole positive numbers from 1 to

65,535. The second column is the type of key, which is always set to the letter M when using MD5

authentication. The third column is the private key that is ASCII text from 1 to 32 characters in length.

Up to eight MD5 can be established.

Editing MD5 keys on the NTP Client

For NTP client authentication, the line trustedkey 1 2in the “ntp.conf” file is required to enable the

private keys 1 and 2 from the “ntp.keys” file. The line bclientis required for broadcast time packets to

be processed by the NTP client. In this case, sample information from a client “ntp.conf” file might look

like:

trustedkey

bclient

Network Time Protocol (NTP) does not permit comments in the ntp.keys files. Inserting comments will

prevent the ntp.keys files from being parsed correctly and turns off authentication at initialization.

Sample information in a client “ntp.keys” file might look like:

symmetricom

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TTXL-GPS

When you invoke the NTP client at the command line, use the following options:

–

to turn on broadcast reception

–

k /etc/ntp.keys

to specify the name and location of the keys file

–

for debugging.

An example command line might look like:

ntpd –d –d –d –b –k /etc/ntp.keys

Important lines in the ntp.conf file of the ntp client (not server) are:

trusted key

If you do not use MD5 authentication, remove # from “#disable auth”.

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E: Time Code Formats

The following section provides a summary description of the three time code types used by the XL-GPS.

The definitive IRIG time code specification, the Range Commanders Council’s IRIG Serial Time Code

Formats, IRIG Standard 200-98, is available on the Web at http://jcs.mil/RCC/manuals/200/

Overview

Please refer to the Input and Output specifications in the front of the manual for details regarding the

voltage amplitudes / modulation ratios of the following time codes provided or used by the Model XL-

GPS.

IRIG

Introduction

The document 200 95 "IRIG STANDARD TIME FORMATS" by the Telecommunications Working Group,

Inter range Instrumentation Group, Range Commanders Council describes IRIG-B time code.

The standard time formats of IRIG codes were designed for use in missile, satellite and space research

programs. Use of these codes facilitates efficient interchange of test data. These formats are suitable

for recording on magnetic tape, oscillographs, film and for real time transmission in both automatic and

manual data reduction. IRIG-B from the Model XL-GPS is suitable for remote display driving, magnetic

tape recording and many other uses. IRIG codes, in the strict sense, encode Universal Coordinated

Time (UTC) in 24 hour format and not local time. Nonetheless, this instrument can encode UTC or local

time in either 24 or 12 hour formats.

IRIG Code Format

Reference “IRIG Standard Format A” on page 140. The level shifted, pulse width modulated, serial

formats of IRIG-B are divided into three segments. The first segment encodes time of year in binary

coded decimal (BCD) notation. The second segment encodes control functions. This segment is

generally available for data of the user's choice. In the IRIG-B code output of Model XL-GPS, this

segment encodes worst case time error flags as explained below. The third segment sometimes

encodes time of day in straight binary seconds (SBS) notation. Both IRIG-B encodes SBS on the Model

XL-GPS.

The three code segments are contained within one "frame". The frame length for IRIG-B is 1 second

long and contains 100 "elements" (pulses) each of which start every 10 milliseconds.

An element may represent either a binary zero, a binary one, a reference marker or a position identifier.

A zero is 0.2 of the duration of an element, a one is 0.5 of the duration of an element and a position

identifier or reference marker is 0.8 of the duration of an element. A reference marker locates the

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beginning of each frame and a position identifier marks the end of every ten elements. IRIG-B has ten

position identifiers per frame.

The elements prior to position identifier P5 comprise the time of year segment. The first ten elements

encode the seconds, the second ten elements encode the minutes and so on through days. Each

element is a digit in a binary number with a place value sequence 1 2 4 8.

IRIG-B Time Quality Flags

Five flags are encoded in the control function segment of the IRIG-B code. The first flag encoded at

element P5+40ms is the LOCK indicator. It is a binary 1 when the XL-GPS is not locked to a reference.

The second flag encoded at element P5+60ms is a binary 1 when the worst case time error exceeds

threshold 1 (refer to "Function 5 -- Time Quality Enable/Setup"). Element P5+70ms is a binary 1 when

the worst case time error exceeds threshold 2. Element P5+80ms encodes a binary 1 when the error

exceeds threshold 3 and P5+90ms when the error exceeds threshold 4.

Output

The XL-GPS provides the following IRIG time code outputs (refer to IRIG Standard 200-95):

IRIG-B: B120

B000

1 kHz sine wave amplitude modulated with BCD, CF, SBS

DC level shift, width coded with BCD, CF, SBS

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Figure 4: IRIG Standard Format A

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F: World Map of Time Zones:

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G: Part Names

Standard Chassis

•

Model XL-GPS 1UChassis w. Main CPU Card

Software-Key Enabled Options

•

Network Time Protocol on Standard Network Port

Time Interval - Event Time (TIET) on Main CPU Card’s J1 connector

Programmable Pulse Output (PPO) on Main CPU Card’s J2 connector

Frequency Measurement (Freq Meas) on Main CPU Card’s J3 connector

Options

•

Expansion Module

Alarm Relay

(must be used in conjunction with the expansion module)

•

OCXO Oscillator

Rack Mount Kit

•

2 mounting brackets for 1 U chassis

4 flat-head Phillips screws

Slide Mount Kit

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H: Sales and Customer Assistance

Symmetricom's Sales and Customer Assistance Centers are a centralized resource to handle all your

customer needs. Our Centers are staffed with logistics personnel to handle product quotes, order status

and scheduling as well as technical personnel for technical support, installations or service quotes.

Technical support is operated as a fee-based service, either under contract or on an hourly basis. Visa,

Mastercard are accepted as well as Purchase Orders from established customers.

Worldwide Telephone: 1-978-232-1477

US Assistance Center

For the United States, Canada, Latin America, Caribbean, and the Pacific Rim (including Asia, Australia

and New Zealand) call:

Tel +1 888 367 7966 (+1 888 FOR SYMM) or +1 408 428 7907 (Worldwide)

Customer Service

For product quotes, service quotes, installations, order status and scheduling

7:00 am to 5:00 pm Pacific Time, Monday through Friday, excluding U.S. Holidays.

Technical Support

For technical support 24 hours a day, 7 days a week, every day of the year contact us at:

[email protected]

EMEA Assistance Center

For Europe, Middle East, and Africa, call:

Tel +44 (0) 1189 699 799 or +1 408 428 7907 (Worldwide)

Customer Service

For product quotes, service quotes, installations, order status and scheduling

8:00 am to 5:00 pm UTC, Monday through Friday, excluding UK Holidays.

Technical Support

For technical support 24 hours a day, 7 days a week, every day of the year, contact us at:

[email protected]

Comments, complaints and suggestions are always gladly accepted:

[email protected]

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Index

Numerics

10/100 BASE- T 79

12/24 Hour Format 35

87-8028-2 109

Accuracy 3

Alarm 25

Alarm Control / Status 64

Alarm Status

LED 25

Alarm Status LED 25, 64

Antenna

Cable Delay 52

Aux Ref 6

J3 Input 100

BASE- T 79

BF 85

BH 83

BootLoader 83

Bootloader Mode 92

BU 84

BUB 83

BUFP 85

Burn 84

Burn BootLoader 83

Burn File System 85

Burn FPGA Firmware 85

Burn Host 83

Cable Delay

Distribution 53

GPS 52

Calibration Statement 11

Certifications 11

Change User Name 91

Change User Password 90

Code Output 72

Code Output Configuration

Configuration 72

Command Line Interface 18, 29

Using 18

CONFIG 87, 114

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CONFIG Parameters 87

Configuration

Factory 103

GPS Receiver 104

Oscillator 93

Configure NTP & SNMP Parameters 87, 114

Continuous Time Once-per-Second 42

Customer Service 143

Daylight Saving Time (DST) Mode 58

Deleted previously set IP host address 113

Dest file bytes written

Configuration files transferred successfully! 113

Display

Configuring Time 17

Distribution Cable Delay 53

DST Mode 58

EA 76

Editing MD5 keys on the NTP Client 136

Editing ntp.conf 135

EMEA Assistance Center 143

ERROR

01 VALUE OUT OF RANGE 111

02 SYNTAX 111

03 BAD/MISSING FIELD 111

Action (get or set) is not specified 112

Can’t create netdevice 111

Can’t open dest file 112

Can’t open source file 112

Can’t set host ip 111

Can’t write file 112

Configuration failed. 112

Configuration type is not specified 112

Invalid Command 111

Error

Time 48

Error Messages 111

Ethernet Address 76

Expansion Module

configuring 20

installing 20

Expansion Module (87-8034) 8

F1 – Time Zone 17, 34

F100 – Network Port & XL-GPS Software 74

F100 BASET – 10/100 BASE- T 79

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F100 BF – Burn File System 85

F100 BH – Burn Host 83

F100 BU – Burn 84

F100 BUB – Burn BootLoader 83

F100 BUFP – Burn FPGA Firmware 85

F100 CONFIG – Configure NTP & SNMP 87

F100 CONFIG – Configure NTP & SNMP Parameters 87, 114

F100 EA – Ethernet Address 76

F100 G – Gateway 78

F100 IC – Network Port Settings 79

F100 IP –IP Address 76

F100 J – Factory Mode Jumper 88

F100 K I L L – Reboot 89

F100 L – Remote Lock Status 81

F100 LOCK/UNLOCK – Remote Lockout 80

F100 P – Change User Password 90

F100 PI – PING 91

F100 PN – Change User Name 91

F100 SM – Subnet Mask 77

F100 ST –Self Test Status 82

F108 – Oscillator Configuration 93

F11 – Time Output Format 46

F110 – J1 Input (Time Code) 93

F111 – J2 Output (Rate) 96

F113 – J3 Input (Aux Ref) 100

F117 – Factory Configuration 103

F119 – GPS Receiver Configuration 104

F126 – Options Key Entry 108

F13 – Time Error 48

F18 – Software Version 49

F2 – 12/24 Hour Format 35

F3 – Time & Date 37

F4 – Serial Port Configuration 38

F5 – Time-Quality Setup 39

F50 – GPS Receiver LLA/XYZ Position 49

F51 – GPS Antenna Cable Delay 52

F52 – Distribution Cable Delay 53

F53 – GPS Operation Mode 55

F6 – Keypad Lock 41

F60 – GPS Satellite List 56

F66 – Daylight Saving Time (DST) 17

F66 – Daylight Saving Time (DST) Mode 58

F69 – Time Mode 18, 61

F71 – Oscillator Statistics 62

F72 – Fault Status 64

F73 – Alarm Control / Status 64

F8 – Continuous Time Once-per-Second 42, 46

F9 – Time On Request 44, 46

F90 – Code Output Configuration 72

Factory Configuration 103

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Factory Mode Jumper 88

Fault Status 64

Firmware 74

Firmware Upgrade 118

Format

Time Output 46

Freq Meas 6, 100

Frequency Measurement 6, 100

Function Reference 32

Function Summary 32

Future Expansion 129

G 78

Gateway 78

Goodbye. 113

GPS

Antenna Cable Delay 52

M12 Receiver 109

Operation Mode 55

Receiver Configuration 104

Satellite List 56

Signal Strength Requirements 15

GPS Receiver LLA/XYZ Position 49

Guest Login

User Name

Password 29

Host ip configured successfully! 113

HP OpenView Configuration 131

IC 79

Informational Messages 113

Installation/Configuration 13

installations 143

IP 76

IP Address 76

IRIG-B 73

J 88

J1 Input (Time Code) 93

J2 Output (Rate) 96

J3 – Auxiliary Reference Input 6

J3 Input (Aux Ref) 100

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K I L L 89

Keypad

Examples 27

Operation 27

Keypad Lock 41

Keypad/Display Interface 25

L 81

Latitude, Longitude, and Altitude 49

LED 25

Alarm Status 25

LLA/XYZ Position 49

Lock Keypad 41

LOCK/UNLOCK 80

Logging In 29

Logging out 30

MD5 136

Measure Frequency Input 100

Menu Display 26

Messages

Informational 113

XL-GPS-Generated 111

MIB Structure 124

Mounting the GPS Antenna 13

Network

Configuring 16

Network Port

Connecting to 19

Connecting to... 19

Network Port & XL-GPS Software 74

Network Port Settings 79

NOTICE

Cannot respond to command because Utility Port session has priority. 113

NTP 9, 135

Configure 87

Configure Parameters 114

ntp.conf

editing 135

OK 113

Operator Login 29

Options 8

Expansion Module (87-8034) 8

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NTP 9

Options Key Entry 108

order status 143

order status and scheduling 143

Oscillator

Statistics 62

Oscillator Configuration 93

P 90

Part Names 142

Password 29

Change 90

Changing 30

PI 91

PING 91

Position 49

Power Supply 16

PPO 96

Private Enterprise MIB Structure 124

product quotes 143

Programmable Pulse Output 96

quotes 143

Rack Mounting 23

Rate Output

J2 96

Reboot 89

Remote Lock Status 81

Remote Lockout 80

Restarting the Unit Please wait… 113

Satellite List 56

Self Test Status 82

Serial Port

Configuration 38

Connecting to 18

Connecting to... 18

service quotes 143

Session Priority 30

Session Timeout 30

Signal Strength Requirements

GPS 15

SM 77

SNMP 74, 75, 87, 88, 112, 114, 115, 116, 124, 125, 126, 127, 129, 130, 131, 132, 133

Configure Parameters 87, 114

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Configuring and Testing 131

Glossary of Related Terms 130

SNMP Addressing 124

SNMP Private Enterprise MIB Structure 124

Software

System Firmware (upgrading) 118

Software Version 49

Source file bytes read

113

Specifications 3

AC Power Supply 4

Chassis 3

Code Out 7

Environmental 3

GPS Reference 3

GPS Time and Frequency Referenc 8

J1 - Optional TI/ET 5, 6

J2 - Optional Programmable Pulse Out (PPO) 6

J2 - Rate Out 5

J3 – Optional Frequency Measurement 6

Network Port 10/100 5

RS-232/RS-422 Interface 4

Standard I/O 4

Time and Frequency 3

ST 82

Statistics

Oscillator 62

Status

Alarm Control 64

Fault 64

Self Test 82

Status Display 26, 28, 29

Subnet Mask 77

Technical Support 143

Test Procedure 133

TIET 93

Time & Date 37

Time Code

J1 Input 93

Time Display 25, 28

Configuring 17

Time Error 48

Time Interval-Event Time 93

Time Mode 61

Time On Request 44

Time Output Format 46

Time Zone 34, 141

Time Zones 141

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Time-Quality Setup 39

Upgrading 74

System Firmware 118

US Assistance Center 143

User Interfaces 25

User Name 29

Change 91

Username

Changing 30

Using F100 Config 114

Version

Software 49

Volatility Statement 12

XL-GPS

Configuration 133

MainCard Group 129

Overview 1

Product Description and Features 1

Rack Mounting 23

Software 74

System Group 126

System Status Group 128

Traps 129

XL-GPS-Generated Messages 111

XYZ coordinates 49

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