Symmetricom XLi User Manual

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XLi Time & Frequency System

Issue 8- June 2008

Manual Part Number: XLi-User Manual

CD Part Number: Xli-Man-CD

XLi Time & Frequency System

XLi-man, Issue 8, 6/17/08, Rev. H

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

User Guide

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Notices

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

Copyright © 2008, Symmetricom, Inc. All rights reserved. Printed in U.S.A. All product names, service marks, trademarks, and registered trademarks used in this document are the property of their respective owners. The manual’s contents do not apply to previously released versions of XLi hardware or software.

ii XLi Time & Frequency System

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Table of Contents

1: Equipment Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

XLi Time and Frequency System Description and Features . . . . . . . . . . . . . . . . . . . 1

Features and Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Clock Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2: System Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Mechanical/Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

AC Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

System Time & Frequency Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

GPS Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Time Code Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Have Quick Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1 PPS Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Aux Ref Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Standard Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Serial I/O Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

NET – Network Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

J1 Input – Time Code or Time Interval - Event Time . . . . . . . . . . . . . . . . . . . . . 9

J2 Output – Rate Out or Programmable Pulse Output . . . . . . . . . . . . . . . . . . . 10

J3 Input – Auxiliary Reference or Frequency Measurement . . . . . . . . . . . . . . 10

1 PPS – Pulse Per Second Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

CODE – Time Code Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

ALARM Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Time Code Output IRIG-B120 w/ IEEE1344 . . . . . . . . . . . . . . . . . . . . . . . . . . 12

OUTPUT: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Time Code Output IRIG-B000 w/ IEEE1344 . . . . . . . . . . . . . . . . . . . . . . . . . . 13

OUTPUT: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Time Code Input IRIG-B120 w/ IEEE1344 . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

INPUT: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Time Code Input IRIG-B000 w/ IEEE1344 . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Manual Leap Second Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

HaveQuick TFOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3: Installation/Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Installing the GPS Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Selecting a GPS Antenna Site Outdoors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Mounting the GPS Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Connecting the Antenna to the Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

GPS Signal Strength Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

GPS-related Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Lightning Arrestor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

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Antenna Splitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

In-Line Antenna Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Making Additional Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Connecting the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Configuring Network Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Configuring the Time Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Using the Command Line Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Connecting to the Serial Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Connecting to the Network Port (TELNET) . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Using the Web Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Installing or Removing Option Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Additional Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Standard XLi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

XLi with a GPS Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

XLi with GPS and Time Code References . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

XLi with two optional GPS receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Installing the Expansion Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Verifying Antenna Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Rack Mounting the XLi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

4: User Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Card Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Alarm Status LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Keypad/Display Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Time Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Status Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Menu Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Keypad Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

Keypad Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Command Line Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Logging In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Operator Login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Guest Login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Logging Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Changing Username and Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Session Time-out and Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Web Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

User Privileges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

Sessions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

User Names and Passwords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Logging In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Navigating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Submitting Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

Logging Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

5: Function Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

Function Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

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F1 – Time Zone Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

F2 – 12/24 Hour Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

F3 – Time & Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

F4 – Serial Port Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

F5 – Time-Quality Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

F6 – Keypad Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

F8 - Continuous Time Once-per-Second . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

F9 - Time On Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

F11 - Time Output Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

F13 – Time Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

F18 – Software Version Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

F27 – FTM III Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

F42 – Multicode Output Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

F44 – N.8 Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

F50 – GPS Receiver LLA/XYZ Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

F51 – GPS Antenna Cable Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

F52 – Distribution Cable Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

F53 – GPS Operation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

F60 – GPS Receiver Satellite List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

F66 – Daylight Saving Time (DST) Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

F67 – Manual Leap Second Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Adding a Leap Second: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Subtracting a leap second: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Setting the manual leap second function to no event: . . . . . . . . . . . . . . . . 88

F69 – Time Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

F71 – Oscillator Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

F72 – Fault Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

F73 – Alarm Control / Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Alarms - General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Clock Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

LPN PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

GPS Primary Receiver and GPS Secondary Receiver . . . . . . . . . . . . . . . . 97

IRIG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Aux Ref . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Primary Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Secondary Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Rubidium Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

First Time Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Time Error and Time Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Alarm LED Blink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Timeout and Timeout Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Power-On Alarm Suppress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

NTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Clear Alarm Latch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

F74 – Clock Source Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

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F77 - PTTI Output Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109

F78 - Parallel BCD Output Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112

F90 – Code Output Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .116

F100 – Network Port Configuration & XLi Firmware . . . . . . . . . . . . . . . . . . . . . .117

F100 EA – Ethernet Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .120

F100 IP – IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .120

F100 SM – Subnet Mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .121

F100 G – Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122

F100 IC – Network Port Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .123

F100 BASET – 10/100 BASE- T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .123

F100 L/LOCK/UNLOCK – Remote Lockout . . . . . . . . . . . . . . . . . . . . . . . . .124

F100 L – Remote Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125

F100 ST – Self Test Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126

F100 BH – Burn Host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .127

F100 BUB – Burn BootLoader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .127

F100 BU – Burn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .128

F100 BF – Burn File System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129

F100 BUFP – Burn FPGA Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130

F100 CONFIG – Configure NTP & SNMP . . . . . . . . . . . . . . . . . . . . . . . . . . .131

F100 J – Factory Mode Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132

F100 K I L L – Reboot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133

F100 P – Change User Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .134

F100 PI – PING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135

F100 PN – Change User Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135

F108 – Oscillator Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .137

F110 – J1 Input (Time Code, TIET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .137

F111 – J2 Output (Rate, PPO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142

F113 – J3 Input (Aux Ref, Freq Meas) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .146

F116 – Display Brightness Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .150

F117 – Factory Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .151

F118 – Option Board Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .152

F119 – GPS Receiver Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .154

F120 - N.1 Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .158

F123 – Have Quick Input/1 PPS Sync Configuration . . . . . . . . . . . . . . . . . . . . . . .161

F126 – Options Key Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .164

F128 – Have Quick Output Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165

6: Option Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .167

Expansion Module (87-8034-1, 87-8034-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .168

IRIG Code Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .168

Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .168

Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .168

Optional Programmable Pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .169

Alarm Relay (87-8034-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .169

Configuring the Expansion Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .169

Multicode Output (87-6002-XL1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .171

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .171

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Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

Adjusting Amplitude and Modulation Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . 172

N.1 Frequency Synthesizer (87-8022) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173

N.8 Frequency Synthesizer (86-708-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174

Low Phase Noise 5 MHz Output (87-8009-5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

Low Phase Noise 10 MHz Output (87-8009-10) . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

1, 5, 10 MHz Sine/MPPS Square Output (86-8008) . . . . . . . . . . . . . . . . . . . . . . . 177

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

Sine Wave Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

Square Wave Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

No Output Or Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Noisy Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Incorrect Frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

T1 Telecom Interface Output (87-6000T1-8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Frame Format Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

T1 AIS Assertion and Output Signal Control on Major Fault . . . . . . . . . . . . . 184

Output Signal Frequency Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Alarm Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

E1 Telecom Interface Output (87-6000E1-6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

Alarm Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

GPS C/A Receiver (87-8028-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192

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Frequency and Time Deviation Monitor (87-8023) . . . . . . . . . . . . . . . . . . . . . . . .192

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .192

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .194

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .195

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .197

Maintenance and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .198

Parallel BCD mSec Output with Time Quality (87-8090) . . . . . . . . . . . . . . . . . . .199

Parallel BCD uSec with Time Quality (87-8090-1) . . . . . . . . . . . . . . . . . . . . . . . .201

Parallel BCD mSec Output with Unlock Status (87-8090-2) . . . . . . . . . . . . . . . . .205

PTTI BCD Output (87-8045) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .207

PTTI 10V 1PPS and 1PPM Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .210

Second Serial Talker or T1 / E1 (87-8047) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .212

HaveQuick/1 PPS Time and Frequency Reference(87-8016-3) . . . . . . . . . . . . . . .216

1PPS Input Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .216

Have Quick Input Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .217

Have Quick Signal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .217

Have Quick Output with selectable TFOM (87-8016-6) . . . . . . . . . . . . . . . . . . . . .219

Have Quick Output Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .219

Have Quick Signal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .219

HaveQuick with selectable TFOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .219

Enhanced Low Phase Noise Module (87-8040) . . . . . . . . . . . . . . . . . . . . . . . . . . .221

Legacy Option Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222

GPS Receiver (86-8013) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222

P7: Oscillators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223

OCXO Oscillator Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223

High Stability OCXO Oscillator Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223

Rubidium Oscillator Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224

High Performance Rubidium Oscillator Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . .224

8: Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .225

Standard 110 VAC Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .225

12 VDC Power Supply Option (87-8012-12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .225

24 VDC Power Input Option (87-8012-24) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .226

48 VDC Power Input Option (87-8012-48) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .226

9: Software Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .227

Symmetricom TimeMonitor Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .227

Logging TIET and Freq Meas Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .227

Other Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .228

10: XLi-Generated Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .231

Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .231

Informational Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .233

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A: Using F100 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

Configuring NTP & SNMP Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

Overview of Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

Set up the FTP Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

Get the IP Address of the FTP Server/Workstation . . . . . . . . . . . . . . . . . . . . 235

Copy the Configuration Files to the FTP Server . . . . . . . . . . . . . . . . . . . . . . . 236

Edit the Configuration Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236

Move the Configuration Files Back to the XLi . . . . . . . . . . . . . . . . . . . . . . . . 237

B: Upgrading System Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239

Overview of Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239

Set up the FTP Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239

Open a Command Line Session on the XLi . . . . . . . . . . . . . . . . . . . . . . . . . . 240

Upgrade the Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243

FAQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244

C: SNMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

SymmetricomTtm-SMIv2.mib . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

xliMainCard-SMIv2.mib . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255

xli-SMIv2.mib . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259

xliSystem-SMIv2.mib . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259

Editing snmp.conf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270

SNMP Private Enterprise MIB Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271

SNMP Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271

New Top Level Structure of Enterprise MIB for XLi . . . . . . . . . . . . . . . . . . . 271

XLi System Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273

The XLi Fault Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274

The XLi System Status Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275

XLi MainCard Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276

XLi Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276

Future Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276

Glossary of SNMP-Related Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

Configuring and Testing SNMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278

Materials Needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278

HP OpenView Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278

XLi Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280

Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280

D: Network Time Protocol (NTP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

Leap Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

Editing ntp.conf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

Editing MD5 keys on the NTP Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284

Editing MD5 keys on the NTP Client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285

E: Time Code Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

IRIG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

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IRIG Code Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .287

IRIG-B Time Quality Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .288

XLi IRIG Time Code Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .288

NASA 36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .289

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .289

NASA 36 Code Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .289

XLi NASA 36 Time Code Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . .289

F: World Map of Time Zones: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .291

G: Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .293

H: Sales and Customer Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .295

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .297

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1: Equipment Overview

XLi Time and Frequency System Description and Features

The XLi provides high-precision time and frequency signals. Its modular design allows customization for a wide range of applications. In its standard configuration, the XLi functions as a Time Code Unit which receives an IRIG time code input, synchronizes its internal oscillator to that input, and produces time code and frequency outputs. When paired with its internal timing-optimized GPS receiver, the XLi

-12

provides 1x10 XLi is available in a 19-inch 1U or 2U chassis with rack mount ears for installation.

This new series of Time and Frequency Clock incorporates a flexible architecture to meet the most demanding clock synchronization requirements. The Model XLi incorporates a dual redundant reference source design that enables high-availability of the clock source. To achieve high-availability, the user configures the XLi with dual independent GPS receivers and antennas, or with one GPS antenna/ receiver and one time code or 1PPS reference. In addition, the 2U chassis, when configured with multiple options, provides dual redundancy and

Optional oscillator upgrades provide enhanced short term stability when locked to a reference source, and improved holdover ‘flywheeling’ when a reference source is unavailable. See “P7: Oscillators” on

page 223 for more information.

frequency output accuracy, and better than 30 nS RMS accuracy to UTC (USNO). The

distribution in a single unit.

Features and Options

Three user interfaces are available for managing the XLi:

• The web interface, available using a browser connected to the network port

• The command line interface, available from the serial port and standard network port (telnet)

• The keypad/display interface, available on the front panel of the XLi

The XLi’s modular design allows customization for a wide range of applications. The following range of features are available in the standard configuration:

• Voltage-controlled temperature-compensated crystal oscillator (VCTCXO)

• 1 PPS Output

• Rate Output 1/10/100 PPS, 1/10/100 kPPS, 1/5/10 MPPS

• Code Output (IRIG-A, B, and NASA 36)

• Alarm Open Collector Output

• Code Input (AM or DC: IRIG-A, B, and NASA 36)

• Auxiliary Reference Frequency Input (1/5/10 MHz)

• Network Port (10/100 Base-T)

• Command Line Interface (Telnet and Port)

• Simple Network Management Protocol (SNMP)

• Web Interface (HTML)

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• RS-232/422 Serial I/O Port

• Vacuum florescent display, 19-button keypad

• 90-264 VAC

In addition, the XLi’s standard features can be expanded with the following optional configurations:

• GPS C/A Receiver References

• Programmable Pulse Output (PPO)

• Network Time Server (NTP)

• Multicode Output Card

• N.1 / N.8 Frequency Synthesizer

• Low Phase Noise 5 MHz Output Card

• Low Phase Noise 10MHz Output Card

• Enhanced Low Phase Noise Module

• T1/E1 Output Card

• Second Serial Talker or T1/E1 Rate Generator

• 1, 5, 10 MHz Sine/MPPS Square Output Card

• Have Quick Input/1 PPS Sync Reference Card

• Have Quick with TFOM Output Card

• PTTI BCD Output

• Parallel BCD mSec Output with Time Quality Card

• Parallel BCD uSec Output with Time Quality Card

• Parallel BCD mSec Output Card

• Oscillator Options: OCXO, Rubidium

• Frequency and Time Deviation Monitor

• Time Interval Event Time Option

• DC Power Supplies for 12, 24, and 48 VDC applications

• Redundant power supplies

• TimeMonitor Software

• Expansion module

See“6: Option Cards” on page 167 for more information. Optional oscillator upgrades provide enhanced short term stability when locked to a reference source, and improved holdover ‘flywheeling’ when a reference source is unavailable. See “P7: Oscillators” on page 223

for more information.

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Clock Architecture

The following figures provide a simplified view of the XLi’s clock architecture.

16.384 MHz Osc. PLL

Aux Ref

Aux Ref - 1/5/10 MHz

Phase Measurement

Clock DPLL

DAC Select

DAC

10 MHz Osc.

200 MHz PLL

1 PPS A 1 PPS B

Code Input

1 PPS Timing Select

Time and Clock

Recovery

Code Input

Phase Compare

Clock Machine

Code Generation

Rate Generation

1 PPS Output

Code Output

Rate Output

Figure 1: Functional Timing Block Diagram

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Display Keypad Oscillator Rb Power

Display/Keypad Interface

I/O

Backplane Interface

Power Supply

AC +5 V, +/- 12 V

110/220 AC

Power Supply

DC +5 V, +/- 12 V

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

Figure 2: Interface Architecture Block Diagram

10 MHz Power, Vc

Power I/O Power I/O

T&F CPUOption

User I/O User I/O

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2: System Specifications

Mechanical/Environmental

Operating Temperature: 0 °C to +50 °C (+32 °F to +122 °F)

Maximum Rate of Change: 8 °C per hour

Storage Temperature: -55 °C to +85 °C (-67 °F to +185 °F)

Humidity: To 95% non-condensing

Operating Altitude: Maximum 4 km (2.49 mi. or 13147 ft.)

Front Panel Display: Vacuum Fluorescent Display (VFD) 4.38” x 0.88" (11.13cm x 2.24 cm). 160X16

pixels. Displays startup messages, clock status, time and day of year, and interactive clock functions. The TIME button displays Time and Day of Year (TOD) on one full-height line.

Keypad: 0–9, UP, DOWN, LEFT, RIGHT, ENTER, CLR, TIME, STATUS, MENU

Serial I/O: Full user-selectable RS-232/422 communication protocol up to 19200 baud

AC Power Supply

Input:

Input connector: IEC 320 connector

Input voltage range: UL: 100 – 240 VAC

Universal, 90 – 264 VAC and 110 – 370 VDC

Input freq. range: 47 Hz – 440 Hz

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

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

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

Wattage: 104 watts

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

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

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

AC power applied.

Fan: Exhaust 3-6 CFM

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System Time & Frequency Accuracy

The tables below describe system clock accuracy while locked to the reference source indicated.

GPS Receiver

1 PPS Output: UTC(USNO) 30 nS RMS, 100 nS peak

Frequency Output Accuracy:

Frequency/Timing, Allan Deviation, Stability (with TCXO):

<1 x 10

1 x 10 3 x 10 3 x 10 2 x 10 1 x 10

-12

@ 1 day

-9

@ 1 sec

-10

@ 10 sec

-10

@ 100 sec

-10

@ 1000 sec

-12

@ 1 day

AM Code Output Accuracy: 10 μS to the 1 PPS output

DC Level Shift Code Output

200 nS to the 1 PPS output

Accuracy:

Time to System Lock <20 min. typical

See GPS Signal Strength Requirements (page 21), and GPS C/A Receiver (87-8028-2) (page 191).

Time Code Input

1 PPS Output: 10 μS to the incoming code

Frequency Output Accuracy:

Stability of Frequency/Timing – Allan Deviation:

-10

1x10

5x10

, referenced to 5x10

-9

@ 10 sec, referenced to 3x10

-11

carrier @ 1 day

-11

@ 10 sec carrier

Accuracy of AM Code Output: 10 μS to the incoming code

Accuracy of DC Level Shift

10 μS to the incoming code

Code Output:

See “F110 – J1 Input (Time Code, TIET)” on page 137.

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Have Quick Input

1 PPS Output: 10 μS to the incoming code

Stability of Frequency/Timing – Allan Deviation:

Accuracy of AM Code Output: 10 μS to the incoming code

5x10

-9

@ 10 sec

Accuracy of DC Level Shift Code Output:

See “HaveQuick/1 PPS Time and Frequency Reference(87-8016-3)” on page 216.

10 μS to the incoming code

1 PPS Input

1 PPS Output: 10 μS to the incoming 1 PPS

Stability of Frequency/Timing – Allan Deviation:

Accuracy of AM Code Output: 10 μS to the incoming 1 PPS

Accuracy of DC Level Shift Code Output:

See “HaveQuick/1 PPS Time and Frequency Reference(87-8016-3)” on page 216.

-9

5x10

@ 10 sec

10 μS to the incoming 1 PPS

Aux Ref Input

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

to the reference < 1 x 10

-12

Note: Manually set the time and date, when using 1 PPS or Aux Ref as the primary references. Set the

date (year) when using IRIG A000, A130, B000, B120, or NASA 36 as the primary reference. See F3 – Time & Date (page 50)

Chassis

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

Receiver Size: 1.75 in. x 17.1 in. x 15.35 in.

Weight: Standard configuration, without options ~9.25 lb. Fully loaded ~ 10.95 lb

2U Chassis: Standard 19" EIA Rack System, hardware included

Receiver Size: 3.5 in. x 17.1 in. x 15.35 in.

Weight: Standard configuration, without options ~12.55 lb. Fully loaded ~ 21.00 lb

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Standard Inputs and Outputs

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

Serial I/O Port

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

Interface: RS-232 or RS-422

Data Rates: 1200, 2400, 4800, 9600 and 19200 bps

Data Bits: 7 or 8

Parity: even, odd, or none

Stop Bits: 1 or 2

Connector: Male 9-pin D subminiature

Pin Assignment: 1------N/C

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

Factory settings: 9600, 8, N, 1

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

See “F4 – Serial Port Configuration” on page 52.

NET – Network Port

The Ethernet port interface has a standard RJ-45 connector that provides IEEE 802.3 frame 10/100 Base-T Ethernet. The XLi can optionally be factory configured as a Network Time Protocol (NTP) server, which can be used to synchronize client computer clocks over a network. This function is only available with GPS and IRIG B input. See “F100 – Network Port Configuration & XLi Firmware” on page 117.

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J1 Input – Time Code or Time Interval - Event Time

Time Code Input Specifications - Modulated (AM) and Demodulated (DC):

Format: IRIG-B120, B000, B120 1344, B000 1344

IRIG-A130, A000 NASA 36

Amplitude (AM): 0.5 Vp-p to 10 Vp-p, 100 kΩ to ground

Ratio (AM): 3:1 ±10%

Amplitude (DC):

Logic Low: Logic Hi:

Impedance: 100 kΩ, 50 Ω

Polarity: Positive or negative

Direction: Forward

Quantity: 1

Connector: Female BNC

Related Features

< 1.25V and Min. 300mV > 1.25V and Max 10V

Propagation delay 0-99999 μS. Error bypass. (See F110 on

page 137)

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

Pulse Width 100 nS, min.

Active Edge: Rising

Amplitude (DC):

Logic Low: Logic Hi:

Impedance: 100 kΩ, 50 Ω

< 1.25V and Min. 300mV > 1.25V and Max 10V

Polarity: Positive

Resolution: 5 nS, Single Shot

Accuracy

Refer to

“System Time & Frequency Accuracy” on page 6

See “F110 – J1 Input (Time Code, TIET)” on page 137.

Note: Any stray input capacitance loading will impact TIET measurements

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J2 Output – Rate Out or Programmable Pulse Output

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

MPPS, 10 MPPS, PPO (if PPO option is installed)

Duty cycle: 40-60% ± 10%

Amplitude (TTL): TTL Levels into 50 Ω

Quantity: 1

Connector: Female BNC

Factory Configuration: The Rate Output is default 10 MPPS

The Programmable Pulse Output (PPO) option (part number 87-8024) generates a precisely synchronized trigger pulse at an arbitrary time and with arbitrary pulse width in integer multiples of 1 μS. The start and stop edges of the PPO can be programmed with 1 μS resolution.

Pulse Width: Programmable in 1 μS steps

Start: Rising

Stop: Falling

Amplitude: TTL levels into 50 Ω

Accuracy

Refer to

“System Time & Frequency Accuracy” on page 6

See “F111 – J2 Output (Rate, PPO)” on page 142.

J3 Input – Auxiliary Reference or Frequency Measurement

Auxiliary Reference (Aux Ref):

Frequency: 1, 5, 10 MHz

Amplitude: 1 Vp-p to 10 Vp-p at 1 kΩ to ground

Amplitude: 1 Vp-p to 3 Vp-p at 50 Ω to ground

Impedance: Configurable 1 kΩ or 50 Ω to ground

SNR: >20db

Quantity: 1

Connector: Female BNC

Factory Configuration: Disabled

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The Frequency Measurement (Freq Meas) option: measures an external frequency applied to the J3 input relative to the XLi’s disciplined frequency.

Frequency: 1, 5, 10 MHz

Resolution 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: 1 kΩ, 50 Ω

Factory Configuration: Disabled

Accuracy

See “F113 – J3 Input (Aux Ref, Freq Meas)” on page 146.

Refer to

“System Time & Frequency Accuracy” on page 6

1 PPS – Pulse Per Second Output

Pulse width: 20 μS ±1 μS

On time edge: Rising

Amplitude: TTL Levels into 50 Ω

Quantity: 1

Connector: Female BNC

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

CODE – Time Code Output

Time Code Output Specifications - Modulated (AM) and Demodulated (DC or DCLS)

Format: IRIG-B120, B000, B120 1344, B000 1344

IRIG-A130, A000 NASA 36

Amplitude (AM): 3 Vp-p, into 50Ω ±10%

Ratio (AM): 3:1 ±10%

Amplitude (DC): TTL into 50Ω

Quantity: 1

Connector: Female BNC

Phasing: In phase with carrier ± 10 μS

Default Configuration: IRIG-B 120

Many IRIG reader devices only decode the BCD time-of-year (TOY) portion of the IRIG frame. Reader devices designed to the IRIG-B122, B002, A132, A002 standard should be compatible with the XLi’s time code outputs.

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ALARM Output

High Z: Power off

High Z: Alarm (enabled alarm fault)

Low Z: Normal (no enabled alarm faults)

Drive: Open Collector

Max. Voltage: 25 VDC

Max. Current: 50 mA

Quantity: 1

Connector: Female BNC

Time Code Output IRIG-B120 w/ IEEE1344

The selectable Code output has an additional selection for IRIG-B-120 w/ IEEE1344. Configuration is via the Keypad / Display, RS232/422 and the Network port via telnet and HTML.

IRIG-B-120 IS DEFINED IN IRIG STANDARD 200-04 AS:

• Format B 100 pps

• 1 = Sine wave amplitude modulated

• 2 = 1KHz carrier/1mSec resolution

• 0 = BCD TOY,CF,SBS

IEEE1344 IS DEFINED IN IEEE1344-1995(R2001) ANNEX F AS:

IRIG-B format, <sync>SS:MM:HH:DDD<control bits> <binary seconds>

where

<sync> is the on time marker

SS seconds 00-59 (60 during leap seconds)

MM minutes 00-59

HH hour of day 00-23

DDD day of year 001-366

<control> 27 binary control characters, see Table 1 (reference IEEE1344)

<binary seconds> binary seconds of day

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Table 1:

Binary Time

quality

1111 Initial condition clock unlocked or 10Sec < ETE

1011 Clock unlocked and 1Sec < ETE <= 10Sec

1010 Clock unlocked and 100mSec < ETE <= 1Sec

1001 Clock unlocked and 10mSec < ETE <= 100mSec

1000 Clock unlocked and 1mSec < ETE <= 10mSec

0111 Clock unlocked and 100uSec < ETE <= 1mSec

0110 Clock unlocked and 10uSec < ETE <= 100uSec

0101 Clock unlocked and 1uSec < ETE <= 10uSec

0100 Clock unlocked and 100nSec < ETE <= 1uSec

0011 Clock unlocked and 10nSec < ETE <= 100nSec

0010 Clock unlocked and 1nSec < ETE <= 10nSec

0001 Clock unlocked and ETE <= 1nSec

0000 Clock locked to a reference source

Xli Estimated Time Error (ETE)

OUTPUT:

• Amplitude (AM): 3 Vp-p ±10%, into 50

• Ratio (AM): 3:1 ±10%

•Qty: 1

• Connector: BNC female

• Phasing: In phase with the XLi 1PPS ± 10 us

Time Code Output IRIG-B000 w/ IEEE1344

The selectable Code output has an additional selection for IRIG-B-000 w/ IEEE1344, configuration is via the Keypad / Display, RS232/422 and the Network port via telnet and HTML.

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IRIG-B-000 IS DEFINED IN IRIG STANDARD 200-04 AS:

• Format B 100 pps

• 0 = Pulse width code

• 0 = No carrier/index count interval

• 0 = BCD TOY,CF,SBS

IEEE1344 IS DEFINED IN IEEE1344-1995(R2001) ANNEX F AS:

See above

OUTPUT:

• Amplitude (DC): TTL into

50 Ω

•Qty: 1

• Connector: BNC female

• Phasing: In phase with the XLi 1PPS ± 200ns

Time Code Input IRIG-B120 w/ IEEE1344

The selectable Code input has an additional selection for IRIG-B-127. Configuration is via the Keypad / Display, RS232/422 and the Network port via telnet and HTML.

IRIG-B-120 IS DEFINED IN IRIG STANDARD 200-04 AS:

• Format B 100 pps

• 1 = Sine wave amplitude modulated

• 2 = 1KHz carrier/1mSec resolution

• 0 = BCD TOY,CF,SBS

IEEE1344 IS DEFINED IN IEEE1344-1995(R2001) ANNEX F AS:

See section TIME CODE OUTPUT IRIG-B120 200-04 W/ IEEE1344 for definition

XLI SYNC:

14 XLi Time & Frequency System

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The XLi first synchronizes to IRIG-B-120 w/ IEEE1344 when the Time Quality control bits are = 0000. The XLi remains synchronized (Locked) while the Time Quality control bits are 0000 through 0101 (ETE < 10uSec). The XLi utilizes the IRIG-B-120 BCD TOY, IEEE1344 year, leap second, and leap second pending bit as the UTC epoch. The XLi time format selection remains on the XLi including the Daylight saving time offset.

INPUT:

• Amplitude (AM): 0.5 Vp-p to 10 Vp-p, 100 k

• Ratio (AM): 3:1 ±10%

•Qty: 1

• Connector: BNC female

Ω to ground

Time Code Input IRIG-B000 w/ IEEE1344

The selectable Code input has an additional selection for IRIG-B-000 w/ IEEE1344. Configuration is via the Keypad / Display, RS232/422 and the Network port via telnet and HTML.

IRIG-B-007 IS DEFINED IN IRIG STANDARD 200-04 AS:

• Format B 100 pps

• 0 = Pulse width code

• 0 = No carrier/index count interval

• 0 = BCD TOY,CF,SBS

IEEE1344 IS DEFINED IN IEEE1344-1995(R2001) ANNEX F AS:

See section TIME CODE OUTPUT IRIG-B120 W/ IEEE1344 for definitions

XLI SYNC:

The XLi first synchronizes to IRIG-B-120 w/ IEEE1344 when the Time Quality control bits are = 0000. The XLi remains synchronized (Locked) while the Time Quality control bits are 0000 through 0101 (ETE < 1uSec). The XLi utilizes the IRIG-B-120 BCD TOY, IEEE1344 year, leap second, and leap second pending bit as the UTC epoch. The XLi time format selection remains on the XLi including Daylight saving time offset.

Input:

• Amplitude (DC): Logic Low < 1.25V >0V

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Logic Hi >2.5V < 10V

• Impedance: 100K, or 50

•Qty: 1

• Connector: BNC female

Ω.

Manual Leap Second Entry

The Manual Leap Second Entry is configurable via the Keypad / Display, RS232/422 and the Network port via telnet and HTML. This function allows the user to enter leap second data. This mode of operation will allow the user to maintain UTC with the XLi clock without an external time reference providing leap second data or in a standalone mode (i.e. without a time reference).

Locked reference sources containing leap second data (GPS and IRIG-B w/ IEEE1344) take priority to the manual leap second entry.

Manual leap second data is applied to the XLi UTC TOD when locked to any reference source that does not contain leap second data.

The manual leap second data will be applied to the clock at the end of the current quarter that it was entered at UTC midnight on the last day of March, June, September, or December

The function is selectable by:

1. Enter / Request the current GPS leap second, e.g. 14.

2. Enter / Request the leap second, adding or subtracting in March, June, September, or December

HaveQuick TFOM

The following Time Figure of Merit Code has been added to the HaveQuick output

Table 2:

TFOM code bits Meaning

0 0 0 0 locked

1 1 1 1 unlocked

All others Not used

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Certifications

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

Equipment (ITE)

FCC: FCC Part 15, Subpart B

CE: 89/336/EEC EMC Directive

73/23/EEC Low Voltage Safety Directive IEC 60950 Safety of Information Technology Equipment (ITE)

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3: Installation/Configuration

Installing the GPS Antenna

For units that include the GPS option, install the GPS antenna and cable 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

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 due to 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 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 XLi requires a 12 Volt-compatible antenna. Antennas not rated for 12 V will be damaged.

• Use a splitter to connect a GPS antenna to multiple receivers. Avoid using BNC “T” connectors.

• 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.

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

Connecting the Antenna to the Receiver

Note that the pipe in the left image of Figure 3 does not separate from the antenna as shown. It is shown in this image for conceptual purposes.

The antenna itself is mounted inside the top half of white antenna assembly. In the image above, this part has the Symmetricom logo on it and the dotted line with the TNC signal connector below it. The top half of the antenna housing is sealed and therefore weather-proof.

The lower part of the white antenna housing shown above, below the dotted line, is used for support and for protecting the antenna cable connection. The two halves of the white antenna housing are secured together by four 4-40 UNC captive screws. The two antenna housing halves come together with an O-

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ring and a key tab and groove. Neither the O-ring or key are critical to the antenna operation. The O-ring makes for a more weather proof seal for the antenna connector. The key ensures that the housing always connects in the same orientation.

The pipe that is shown disconnected above, also acts as a protective housing for the optional antenna preamplifier. A preamplifier should be connected to the antenna assembly if the distance between the antenna and receiver is greater than 150 ft. The preamplifier connects to the TNC connector on the antenna housing by a three inch TNC to TNC adapter cable. The open end of the preamplifier is then connected signal cable from the receiver connects to the

A 50 ft cable is provided with each antenna assembly. If the distance between the antenna assembly and receiver is greater than 50 ft, replace the 50 ft cable with a longer cable as opposed to adding an extension to the 50 ft cable.

To connect the antenna cable to the antenna assembly, do the following:

1. Separate the antenna by loosening the four captive antenna housing screws.

2. Pass the TNC end of the receiver signal cable through the support pipe and lower half of

the antenna assembly and connect it to the antenna signal connector.

a. If a preamplifier is to be used, connect the three inch preamplifier adapter cable to

the antenna signal connector.

b. Connect the preamplifier to the adapter cable.

c. Connect the receiver signal cable to the preamplifier.

3. Reconnect the antenna by tightening the four captive antenna housing screws. Make

sure that the O-Ring is correctly sitting in its groove and that the Key tab and groove are engaged.

GPS Signal Strength Requirements

Refer to Figure 4: GPS Signal Strength Requirements.The required external gain at the GPS receiver’s ANTENNA connector is between 20 and 36 dB.

For example, the Symmetricom GPS antenna provides approximately 41 dB of gain. If one subtracts the 16-21 dB loss of the 150 foot RG-59 coax antenna cable supplied by Symmetricom, the external gain reaching the ANTENNA connector is between 20 and 36 dB, which meets the requirement. Abide by the minimum input gain requirements when using other cable types and GPS antennas.

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Other factors, such as radiation, coverage, VSWR, and input impedance also affect system performance. Symmetricom recommends using the standard antenna and cable provided.

Figure 4: GPS Signal Strength Requirements

GPS-related Accessories

The following options can be obtained from Symmetricom to:

• Protect against lightning and field-induced electrical surges.

• Connect multiple GPS receivers to a single antenna.

• Extend the range of the GPS antenna cable.

Lightning Arrestor

Lightning may damage GPS system components and receiving equipment, even without a direct hit, resulting in costly repairs and critical interruption of service. The lightning arrestor is designed to work in conjunction with a low-resistance, low-inductance ground to protect your GPS receiver and elements of the antenna system from lightning discharges and field-induced electrical surges. In-line lightning arrestors are mounted between the antenna and the point where the cable enters the building and require no additional power or wiring except the ground lead.

Antenna Splitter

An antenna splitter may be used to drive multiple GPS receivers using a single antenna. With built-in amplification to overcome splitter losses, the Active Splitters may be conveniently cascaded without adding separate amplifiers and bias-tees between splitters. Power is conveniently obtained from the GPS receiver(s) connected to the amplifier, eliminating the need for a separate dc power supply and wiring.

In-Line Antenna Amplifier

In-line amplifiers overcome signal attenuation in by amplifying the GPS signal. Mounting the amplifier inside the mounting mast helps protect it from moisture and exposure to the elements. Use the in-line amplifier for cable runs of 150 to 300 feet (45 m to 90 m). Please contact a Symmetricom Sales Representative for information on how to extend the distance from the antenna to the receiver.

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Making Additional Connections

Make the following optional connections to the standard input/output connectors on the XLi back panel:

• The ANTENNA connector to a GPS antenna cable. (Note: Use a 12-volt capable GPS antenna.)

• The NET network port (RJ-45) to an ethernet network using Cat 5 cable (supplied). This connection is needed to manage the XLi remotely, or to use the optional NTP function.

• The SERIAL I/O connector to a PC using the supplied RS-232 null modem cable.

• J1, J2, and J3, if needed. See “F110 – J1 Input (Time Code, TIET)” on page 137

Output (Rate, PPO)” on page 142, “F113 – J3 Input (Aux Ref, Freq Meas)” on page 146

, “F111 – J2

Figure 5: Connectors: ANTENNA, SERIAL I/O, J1, J2, J3, NET, 1PPS, 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 XLi.

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

Notes for optional DC power supplies:

• Use a 15 amp circuit breaker in series with the DC power source; avoid connecting 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 XLi goes through its startup sequence; displaying “BOOTING”, “LOADING”, and “STARTING”. After approximately 40 seconds, the XLi displays the clock status, and user interfaces (front panel/command line) become available.

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Configuring Network Settings

The following additional steps are required to make the XLi operational on a network. Make the XLi operational on a network if you plan on managing the XLi remotely over the network or distributing timing

information from the XLi over the network

Press Result

ENTER Displays “FUNCTION”

100 Enters 100 as the function number

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

ENTER Displays “IP ADDRESS…”

1-9… Enter the unit’s IP Address (e.g., 192.168.0.11)

ENTER Displays “SUBNET MASK…”

1-9… Enter the Subnet Mask (e.g., 255.255.255.000)

ENTER Displays “DEFAULT GATEWAY…”

1-9… Enter the Default Gateway’s IP address (e.g., 192.168.0.1)

ENTER 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 XLi

Notes:

• To prevent TELNET and web interface (HTTP) access to the XLi, change Remote Lockout to LOCK. Doing this shuts down TELNET and HTTP access through the XLi’s network port so that the XLi’s functions are available only through the keypad/display interface, and through the serial port command line interface.

• For additional information, consult the relevant topics covering the F100 commands in the XLi User’s Guide and Reference Manual.

Configuring the Time Display

Use the following functions to configure how the XLi to displays time. The keypad button sequences in parentheses provide show how to select these functions and enter the desired settings:

F1 – Time Zone Offset: Enter the difference, in hours, between UTC and the standard time zone of the time display. See “F1 – Time Zone Offset” on page 48 for more information.

and “F: World Map of Time Zones:” on page 291

For example, US Pacific Standard Time is UTC -08:00, while Japan Standard Time is UTC +9. To enter the time zone offset, press the following buttons:

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The user would enter F1 (ENTER, 1, ENTER), set a positive or negative sign (up/down arrow button), and enter the number of hours (0800 or 0900).

F2 – 12/24-Hour Format: Select a 12 or 24-hour display format. The default setting is the 24-hour display format, which represents 6 PM as “18:00”. The user would enter F2 (ENTER, 2, ENTER), See

“F2 – 12/24 Hour Format” on page 49

F3 – Time Date: If you’re using IRIG time code as the primary reference source, verify or update the current year in F3. If you’re using GPS as the primary reference source, you can skip this step. See “F3

– Time & Date” on page 50.

F66 – Daylight Saving Time (DST): If needed, set when Local time enters and leaves DST. See “F66 –

Daylight Saving Time (DST) Mode” on page 84.

F69 – Time Mode: Select the type of time shown on the front panel display and output by functions F8, F9, and F90. See “F69 – Time Mode” on page 89

. The four choices are as follows:

• UTC (Coordinated Universal 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 offset. For example, Pacific Standard Time is UTC minus 8 hours

• Local Time is UTC adjusted by the standard time zone offset and the daylight saving time adjustment (if in effect).

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Using the Command Line Interface

The next two sections show how to connect to the XLi using the serial and network ports. Both the serial port and the network port give the user access to the XLi’s command line interface. While the keypad/

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

• Additional functions that aren’t available through the keypad/display

• Remote access over a network

To use the command line interface, refer to the explanations and examples in the ‘Command Line’ subsections for each function in the XLi 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 XLi.

Verify that the XLi’s serial port settings are as follows: (Keypad: ARROWs.)

• Serial Port – RS232

• Baud rate – 9600

• Data bits – 8

• Parity – NONE

• Stop bits – 1

ENTER–4–ENTER. Use the UP/DOWN

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

Connect a null-modem cable from the PC’s serial port to the XLi’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 XLi. (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 XLi User’s Guide and Reference Manual and examples.

Troubleshooting Tip: If the terminal emulation software has trouble displaying XLi responses (looks like the unit doesn’t respond to inputs), add a 1 ms/character delay to the software’s serial port settings.

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. The ‘Command Line’ sub-sections provide instructions

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Connecting to the Network Port (TELNET)

The network port provides remote access to the XLi’s command line interface. Complete the following steps to connect to the network port.

1. Use function F100 IP – IP Address (page 120)

2. Open a telnet session from your PC to the XLi.

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

3. Log in as user name “operator” and password, “janus”. Press Enter 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 XLi User’s Guide and Reference Manual and examples.

, to obtain the XLi’s IP address.

. The ‘Command Line’ sub-sections provide instructions

Related topics:

• “Configuring Network Settings” on page 24

• “F100 L/LOCK/UNLOCK – Remote Lockout” on page 124

Using the Web Interface

The network port also provides remote access to the XLi’s web interface. To connect to the web interface:

1. Use function F100 – Network Port Configuration & XLi Firmware (page 117) pad or F100 IP – IP Address (page 120)

2. Enter the XLi’s IP address in the address bar of a web browser.

3. At the XLi Home Page, click the Login button, (see note after step 5).

4. Enter the appropriate user name and password. The factory default settings are “operator1” through “operator10” for the user names, and “zeus” for the passwords. Also “user1” through “user10” for the user names, and “ttm” for the passwords. In some cases, older units that have

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on the command line, to obtain the IP address of the XLi.

on the front panel/key-

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been upgraded may have “casey” as the password. Settings are “operator1” through “operator10” for the user names, and “casey” for the passwords. Also “user1” through “user10” for the user names, and “ttm” for the passwords.

5. Click the Login button with your mouse.

Note: Keep track of the user name and password. There is no command to reset the user name and

password to the factory default settings.

For more information, see “Web Interface” on page 40.

Installing or Removing Option Cards

Warning: Installing and removing option cards can expose dangerous voltages that can cause

electric shock resulting in injury or death. Disconnect all power before installing or removing option cards. Dangerous voltages may be present in option cards and in the unit even when the power is disconnected.

To install an option card:

1. Set the unit up on a clean, safe, stable work surface that provides good visibility and maneuverability to work with screwdriver.

2. On the back panel, select an option bay and unscrew the retaining screws and remove the small aluminum panel from the option bay.

3. Line up the edges of the card with the guide grooves in the option bay and slide it in.

4. When the card is in almost all the way, push it firmly the rest of the way in until the faceplate of the option card is flush with the back panel.

5. Insert and tighten the retaining screws so the option card is secured in place.

To remove an option card, remove the screws, pull the card out, and secure the small aluminum panel in its place with the screws.

Additional Configuration

This section:

• Provides the factory settings of several XLi configurations

• Identifies which functions can be used to change those settings, and a cross-reference to the corresponding page in this manual.

• Provides instructions for changing the settings, if needed.

Note: Unless specified, the settings remain the same as those in the Standard XLi.

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Standard XLi

The standard XLi configuration comes with an AC Power supply and CPU module. The standard XLi does not require

Description Setting Function & Cross Reference

changes to its factory settings, which are as follows:

J1 Configuration IRIG-B (120 AM)

“F110 – J1 Input (Time Code, TIET)” on page 137

J1 Time Reference Primary

“F110 – J1 Input (Time Code, TIET)” on page 137

J2 Rate Out 10 MPPS

J3 Configuration Aux Ref Disabled

“F111 – J2 Output (Rate, PPO)” on page 142

“F113 – J3 Input (Aux Ref, Freq Meas)” on page 146

1 PPS 1 PPS – non configurable Non configurable

Code Output Format IRIG-B (120 AM)

Reference Source PRI

“F90 – Code Output Configuration” on page 116

“F74 – Clock Source Control” on page 107

Additionally, the Standard XLi’s factory settings for F73 are as follows:

Indicator/Parameter Name Factory Setting

PLL Locked Alarm Enabled

Low Phase Noise (LPN) PLL Locked Alarm Enabled

GPS Primary Receiver Alarm Disabled

GPS Secondary Receiver Alarm Disabled

IRIG Fault Alarm Enabled

Aux Ref Fault Alarm Disabled

Primary Power Alarm Enabled

Secondary Power Alarm Disabled

Rubidium oscillator (visible on display when Rb Osc is installed) Alarm Disabled

DAC Alarm Disabled

First Time Lock Alarm Enabled

Time Error Alarm Enabled

Time (Error) Threshold 0000 nS

Alarm LED Blink Alarm Enabled

Timeout Alarm Enabled

Timeout Delay 300 sec.

Power-On Alarm Suppress 300 sec.

NTP Alarm Enabled

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XLi with a GPS Reference

This XLi configuration includes a GPS receiver factory configured as the primary reference source. Except for the following functions, the factory settings are the same as those for the Standard XLi:

Description Setting Function & Cross Reference

J1 Time Reference STANDBY

GPS Antenna Cable Delay 60 nS delay

GPS Time Reference Bay 1 - Primary

“F110 – J1 Input (Time Code, TIET)” on page 137

“F51 – GPS Antenna Cable Delay” on page 77

“F119 – GPS Receiver Configuration” on page 154

GPS Primary Alarm Enabled

“F73 – Alarm Control / Status” on page 94

XLi with GPS and Time Code References

To configure an XLi with a GPS Reference to use a time code input on J1 as a secondary reference source, complete the following additional steps:

• Evaluate the relative quality of the time code source versus GPS to ensure that switching from one to the other is acceptable.

• Set the Time Code as ‘SECONDARY’ using F110 – J1 Input (Time Code, TIET)

•Set F74 – Clock Source Control

• Enable the IRIG alarm in F73 – Alarm Control / Status

to “PRI-SEC-SEC”.

The following table indicates the section to go to for additional information:

Description Setting Function & Cross Reference

J1 Time Reference Change from STANDBY to SECONDARY

“F110 – J1 Input (Time Code, TIET)” on page 137

Reference Source Change from PRI to PRI – SEC – SEC

IRIG (alarm) Change from DISABLED to ENABLED

“F74 – Clock Source Control” on page 107

“F73 – Alarm Control / Status” on page 94

XLi with two optional GPS receivers

In this hardware configuration, the optional GPS receivers are set up as primary and secondary reference sources. No changes required

Description Setting Function & Cross Reference

GPS Time Reference Bay 1 – PRIMARY

GPS Time Reference Bay 2 – SECONDARY

Reference Source PRI – SEC – SEC

GPS PRI (alarm) ENABLED

GPS SEC (alarm) ENABLED

30 XLi Time & Frequency System

“F119 – GPS Receiver Configuration” on page 154

“F74 – Clock Source Control” on page 107

“F73 – Alarm Control / Status” on page 94

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Installing the Expansion Module

Warning: Installing and removing the expansion module can expose dangerous voltages that

can cause electric shock resulting in injury or death. Disconnect all power before installing or removing the option card. Dangerous voltages may be present in the expansion module and in the unit even when the power is disconnected.

To install the optional Expansion Module:

1. Set the unit up on a clean, safe, stable work surface that provides good visibility and maneuverability to work with screwdriver.

2. On the back panel, select an option bay and unscrew the retaining screws and remove the small aluminum panel from the bay.

3. Line up the edges of the module with the guide grooves in the option bay and slide it in.

4. When the card is in almost all the way, push it firmly the rest of the way in until the faceplate of the option card is flush with the back panel.

5. Insert and tighten the retaining screws so the expansion module is secured in place.

To remove the expansion module, remove the screws, pull the card out, and secure the small aluminum panel in its place with the screws.

Verifying Antenna Installation

After completing the above steps, use the keypad/display to verify the following:

•In F119 – GPS Receiver Configuration (page 154) check that GPS STATUS is LOCKED and GPS ANTENNA is OK.

•In F73 – Alarm Control / Status (page 94) ENABLED (the same for GPS SEC, if two GPS receivers are present). Clear any alarm latches if present.

• Press the STATUS key. “LOCKED GPS PRI” should appear on the front panel display without an asterisk. If an asterisk appears, it means that a reference source is not available.

To troubleshoot a problematic Antenna installation, recheck the physical location of the antenna, the cabling, and the configuration settings described in this manual.

, check that the GPS PRI is OK and is ALARM

, after approximately 20 minutes of operation,

Rack Mounting the XLi

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

• 2 mounting brackets

• 4 flat-head, Phillips screws

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Have the following items ready and available:

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

• A #2 size Phillips bit screwdriver

To rack mount the XLi:

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

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

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

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

• Secure the brackets to the rack using rack mount screws.

Note: Ensure that the ambient operating temperature does not exceed +50° C. Install the XLi chassis so that the top and bottom holes are unobstructed and have sufficient clearance to allow 6 cfm of air to pass through the chassis. To maintain recommended operating temperatures, install a rack-cooling fan capable of 100 cfm in heavily loaded racks.

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4: User Interfaces

The XLi features three user interfaces for controlling the XLi’s functions:

• A keypad/display interface

• A command line interface

• A web interface

, available from a browser connected to the XLi’s network port.

There is also an Alarm Status LED

on the front panel of the XLi

, available through the serial and network ports

on the front panel.

Card Positions

In the user interfaces, the card positions are referred to by Option Bay number (see Figure 6).

1 U Chassis:

Power Supply

2 U Chassis:

Opt. Power Supply

Bay 4

Bay 3

Bay 10

Bay 9

Bay 2

Bay 1

Bay 6

Bay 5

XLi CPU Module

Bay 2

Bay 1

Bay 8

Power Supply

Bay 7

Bay 4

XLi CPU Module

Bay 3

Figure 6: Option bay positions as seen from the rear of the XLi 1 U and 2 U chassis.

Alarm Status LED

The Alarm Status LED, located on the front panel, displays the alarm-state of the XLi unit. The LED has four states:

Dark

Green

Amber

Red

= Power is off.

= No F73-related alarms. The current reference source input is locked.

= No F73 Alarms. Time-out Delay is counting down, but hasn’t elapsed. The current reference

source input is unlocked (e.g. broken antenna cable or no GPS signal)

= An indicator in F73 has triggered an alarm. Check F73 to find out what the fault/unlock condition

is and take appropriate action.

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Notes:

• The amber LED can turn green again while the reference source input remains unlocked because:

- F119’s ‘GPS Status’ controls whether

- F73’s ‘Time-out Delay’ controls how long

• The blinking of the LED has no meaning. It is a user preference that can be enabled or disabled using the F73’s ‘LED Blink’ setting. If enabled, the LED blinks when it is green and yellow, but stays unblinking when it is red. If disabled, the LED doesn’t blink.

the LED turns amber.

the LED remains amber.

Keypad/Display Interface

Time Display

Press the TIME button on the keypad to display the time only. Use the TIME button to exit the STATUS, MENU, or function displays. The default time format is DDD:HH:MM:SS.

For example:

200:21:24:09

Where:

DDD = Day of year

HH = Hours

MM = Minutes

SS = Seconds

Time Display related functions:

• Select between the 12 or 24 hour format displayed: “F2 – 12/24 Hour Format” on page 49

• Select between Local, Standard, UTC, and GPS time: “F69 – Time Mode” on page 89

Time related functions:

• “F1 – Time Zone Offset” on page 48

• “F3 – Time & Date” on page 50

• “F66 – Daylight Saving Time (DST) Mode” on page 84

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Status Display

The Status Display comes up automatically when the XLi is rebooted. To manually switch from another display to the Status Display, press STATUS button on the keypad. The display appears with the following format:

<STATUS> <∗> <REF CLK> <TYPE> DDD:HH:MM:SS YYYY

For example:

LOCKED ∗ GPS PRI UTC 200:21:24:09 2002

where:

LOCKED = The System Clock is Locked or Unlocked to the current reference source. See Clock

Status in

* = A reference source input has been configured, but is not available. (Note: When using

GPS, “*” may remain visible for up to 13 minutes) See

Configuration” on page 154

GPS PRI = Shows the reference source type (The function that controls each one is noted below):

Automatic switching between the reference sources listed above is controlled by

Clock Source Control” on page 107.

UTC =

200:21:24:09 2002 =

Time display mode: GPS, UTC, Standard, or Local (

The time, in DDD:HH:MM:SS YYYY format (

“F73 – Alarm Control / Status” on page 94

“F119 – GPS Receiver

• GPS PRI, GPS SEC (

• IRIG A, IRIG-B, NASA 36 (

page 137)

• HQ/PPS PRI, HQ/PPS SEC (“

figuration” on page 161

• AUX REF (“F113 – J3 Input (Aux Ref, Freq Meas)” on page 146)

“F119 – GPS Receiver Configuration” on page 154)

“F110 – J1 Input (Time Code, TIET)” on

“F123 – Have Quick Input/1 PPS Sync Con-

“F69 – Time Mode” on page 89)

See “Time Display” on page 34.)

“F74 –

Menu Display

To use the XLi functions that are available from the keypad, press the MENU button on the keypad.

“Function Summary” on page 45

lists which functions are available from the Menu Display.

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Pressing the MENU key on the front of the XLi displays the first function, F1: TIME ZONE OFFSET:

F1:

TIME ZONE OFFSET

Pressing the UP ARROW key increments to the next function, F2 - 12/24 HOUR FORMAT, and so on. Pressing the DOWN ARROW key skips to the highest available function, F128 – Have Quick Output Configuration (page 165), and from there, decrements through the functions.

The section, “5: Function Reference” on page 45

, provides detailed information on all of the XLi’s

functions.

Keypad Operation

Use XLi’s front panel keypad to operate the menu-driven keypad/display interface.

The following table explains how the individual keys work:

UP ARROW Increase value/Display next choice above

DOWN ARROW Decrease value/Display next choice below

RIGHT ARROW Move cursor right

LEFT ARROW Move cursor left

0-9 Enter numeric values

ENTER Enters currently displayed choice, e.g., a function or yes/confirmation to save changes

CLR Clears the current selection/choice and returns to the last saved value

TIME Displays the current time. Can also be used to exit a function without saving changes.

STATUS Displays the clock status and time. Can be used to exit a function without saving

changes.

MENU Displays first item in function menu. Use UP/DOWN ARROWs to display other functions.

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Keypad Examples

The following examples show how to use the keypad effectively.

To open a function using ENTER:

Press Result

ENTER Displays the “FUNCTION” prompt

2 Enter the function’s number (“2” in this example)

ENTER Displays F2’s first screen, “DISPLAY HOUR FORMAT: 24 HOUR”

To open a function using MENU:

Press

MENU Displays F1 on the front panel display

UP/DOWN ARROW Scrolls through the list of functions

ENTER Opens the function and displays its first screen

To change the settings in a function, and not save them:

Press

MENU Displays “F1: TIME ZONE OFFSET”

ENTER Displays “TIME ZONE OFFSET –08:00”

UP ARROW Changes the minus sign in “– 08:00” to a plus in “+08:00”

RIGHT ARROW Moves the cursor to the right, under “0”.

UP ARROW Changes “0” to “1”, making “+18:00”

ENTER XLi asks “SAVE CHANGES? YES”

UP ARROW Changes “YES” to “NO”

ENTER Abandons the changes and displays the Status Display

Result

Other ways to abandon new settings in a function:

Press

CLR Abandons all changes and displays to the first screen in the function

TIME Abandons all changes, exits the function, and displays the Time Display

STATUS Abandons all changes, exits the function, and displays the Status Display

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To enter numeric values in a function:

Press Result

ENTER Displays the “FUNCTION” prompt

3 Enters “3” as the function number

ENTER Opens Function 3, displays the first screen, “TIME MODE – LOCAL”

ENTER Displays the second parameter, “DATE-TIME…<mm>/<dd>/<yyyy>”

05152002 Enters May 15, 2002 as today’s date. (replace)

ENTER Displays “DATE-TIME”

ENTER XLi asks “SAVE CHANGES? YES”

ENTER Selects “YES”, saves the changes, and displays the Status Display

Command Line Interface

To open a command line session, connect to the serial or network port using a terminal or a terminal emulation program on a PC.

Consult “5: Function Reference” on page 45

for information on the function commands.

Logging In

Two user names are available for logging in to the network port’s command line interface: “operator” and “guest”. The serial port’s command line interface does not require the user to log in.

Operator Login

The Operator has full privileges to change the settings in all the XLi’s functions and to perform firmware updates. As shipped, you can log in as Operator using:

User Name: operator Password: janus

To maintain security, change the Operator password at installation. If you are logged in as “operator”, the only command line interface function you cannot perform is changing the Guest password.

Guest Login

Use the guest login to view function settings. As shipped, you can log in as guest using:

User Name: guest Password: ttm

To maintain security, change the Guest password at installation. If you try to use a function that is not accessible from the guest login, you will see a message such as “Access denied” or “Command canceled”.

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Logging Out

You can log out using any of the following commands:

logout logoff exit quit

Changing Username and Password

To change the user name and password, use the following commands:

•

“F100 P – Change User Password” on page 134

• “F100 PN – Change User Name” on page 135

To reset a lost or forgotten operator username/password, use F100 P and F100 PN commands from the command line interface on the serial port.

Session Time-out and Priority

The XLi’s system firmware closes inactive command line sessions on the network port after 15 minutes. The XLi does not terminate inactive command line sessions on the serial port.

The user can open a network port session and a serial ports session concurrently, provided the other session is inactive

Second). The XLi does not allow two or more concurrent network port sessions.

A network port session can be active while an inactive serial port session is open. However, if the serial port session receives user input at this point, it takes control away from the network port and does not yield control to the network port again. The network port will show a prompt, but won’t accept additional commands after the serial port has taken control. Attempting to close the network port session and open a new one will fail; a network port connection cannot be re-established until the serial port has been closed. The following transcripts shows a ‘contest’ between a serial and a network port session:

(i.e., not actively performing a function such as F8 - Continuous Time Once-per-

Serial port session:

>f100 ic f100 IP:192.168.46.150 SM:255.255.255.0 G:192.168.46.1

>NOTICE: A NEW TELNET SESSION HAS BEEN STARTED ON THE INTERNET PORT!

>f100 ic NOTICE: THERE IS ALREADY A TELNET SESSION ON THE INTERNET PORT! NOTICE: YOU HAVE TAKEN CONTROL AWAY FROM THE TELNET SESSION! f100 IP:192.168.46.150 SM:255.255.255.0 G:192.168.46.1

>f100 ic f100 IP:192.168.46.150 SM:255.255.255.0 G:192.168.46.1 >

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Network port session:

WELCOME TO SYMMETRICOM NETWORK INTERFACE! USER NAME: operator

>f100 ic f100 IP:192.168.46.150 SM:255.255.255.0 G:192.168.46.1

>NOTICE: UTILITY MONITOR SESSION HAS TAKEN PRIORITY FROM THIS TELNET SESSION!

>f100 ic NOTICE: CANNOT RESPOND TO COMMAND BECAUSE UTILITY PORT SESSION HAS PRIORITY!

Web Interface

The web interface presents most of the XLi’s functions in a convenient and easy-to-use way.

Figure 7. The web interface showing the XLi Admin Homepage

User Privileges

Administrative users can view status information and change the XLi’s configuration. Non-administrative users can view status information, but cannot change the XLi’s configuration.

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The web interface manages this distinction by providing two sets of web pages. Pages available from the XLi Admin Homepage display status information and let the user change the XLi’s configuration settings. Pages available from the XLi User Homepage only display status information.

Administrative users (e.g., operator1) have access to both the XLi Admin Homepage and the XLi User

Homepage sets of pages. Non-administrative users (e.g., user1) only have access to the XLi User Homepage set of pages.

Sessions

Only one user can be logged into the web interface at a time. The web interface does not support concurrent web sessions. If a second user tries to log in, the browser displays a "503 Web Page Server Busy" message.

The XLi supports concurrent user sessions on the web and command line interfaces (on the network or serial port). However, Symmetricom recommends avoiding concurrent administrative user sessions.

The XLi’s web server automatically closes inactive web sessions after 30 minutes of inactivity.

User Names and Passwords

The ten administrative user names, “operator1” through “operator10”, have “zeus” as the default password. Some older units, when upgraded, may have “casey” as the default password.

The ten non-administrative user names, “user1” through “user10”, have “ttm” as the default password.

Only administrative users can change the user names and passwords. User names and passwords must have 1 to 15 characters, and are limited to upper/lower case alphanumeric and underscore (“_”) characters. No “special” characters.

Logging In

To log in, enter the IP address of the XLi’s “NET” network port into the web browser’s address field. At the XLi Home Page, click the Login button. Enter the appropriate user name and password and click the Login button with your mouse. The browser displays the XLi Admin Homepage or XLi User Homepage.

Navigating

Several notes about using the web interface:

• The home page presents an image of the XLi’s front panel to assist with identification, should the user need to find it on a rack.

• The images of the 1U and 2U chassis show the position of the options bays as seen from the

rear of the unit.

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The links on the left navigation bar provide access to three different aspects of the XLi:

• General - the general status and configuration of the XLi system (e.g., user accounts, clock settings, alarms, SNMP, and NTP).

• System I/O - the status and configuration of the input and output connectors on the rear of the main CPU card (e.g., communication settings, code out, J1, J2, and J3).

• Subsystem - configuration of the option cards located in the option bays

Under Subsystem, the XLi names CPU-aware option cards to the right of the option bay where they are located. Cards that are not CPU-aware can be present and fully operational in an option bay, but are not shown in the web interface. For more information, see F118 – Option Board Configuration (page 152)

Please note that whether the XLi is a 1U or a 2U high model, the web interface shows links for ten option bays in the left navigation bar. Only option bays with CPU-aware option cards will have active links. Clicking the link of an unpopulated or non-existent option bay simply refreshes the web page.

When clicking on links, allow each page to load before clicking another link. Clicking links too quickly may cause the Login page to appear.

Submitting Changes

When submitting changes, only click the Submit Changes button once. Wait for the web page to load before navigating away from the page or submitting another change.

Logging Out

To log out, click the Logout button located in the upper left corner of the page. If the user closes the browser without logging out, a new session will not be available until the XLi closes the inactive session after 30 minutes.

Notes

Notes for specific pages in the web interface:

• Units equipped with the GPS C/A Receiver (87-8028-2): When the user changes theGPS Mode setting and applies the changes, the GPS receiver goes through several states before attaining the user-specified mode.

• Change Login Page: To change the Operator name, but not the password, leave the password field blank and submit the change.

• The navigation bar on the left side of the page provides links to the following CPU-aware cards (see F118 – Option Board Configuration (page 152)

- N.1 Frequency Synthesizer (87-8022)

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

- Frequency and Time Deviation Monitor (87-8023)

HaveQuick/1 PPS Time and Frequency Reference(87-8016-3)

- Have Quick Output with selectable TFOM (87-8016-6)

- PTTI BCD Output (87-8045)

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- Parallel BCD mSec Output with Time Quality (87-8090)

- Parallel BCD uSec with Time Quality (87-8090-1)

- Parallel BCD mSec Output with Unlock Status (87-8090-2)

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5: Function Reference

Function Summary

The following summary lists all the XLi functions, identifies the user interfaces from which each one is available, and provides a brief description of the function.

Available from: K = keypad, N = Network Port (Telnet), S = Serial Port, W = Web

Function

Available From

Description

“F1 – Time Zone Offset”, page 48

“F2 – 12/24 Hour Format”, page 49

“F3 – Time & Date”, page 50

“F4 – Serial Port Configuration”, page 52

“F5 – Time-Quality Setup”, page 53

“F6 – Keypad Lock”, page 55

“F8 - Continuous Time Once-perSecond”, page 56

“F9 - Time On Request”, page 58

“F11 - Time Output Format”, page 59

“F13 – Time Error”, page 61

“F18 – Software Version Request”, page 62

“F27 – FTM III Configuration”, page 63

K,N,S,W Set the time offset for Standard and Local time

K,N,S,W Apply a 12 or 24-hour format to the Front Panel Display, to

F8, F9, and F90.

K,N,S,W Set the time and date (when not already provided by a

reference source)

K,N,W Configure the main serial port settings

K,N,S,W Set the thresholds for each of the four time quality flags

K*,N,S Lock keypad access to the XLi’s functions. (When locked,

F6 is the only function available from the keypad.)

N,S Output the time once-per-second (to the command line)

N,S Output the time when triggered (to the command line)

N,S Change the format of the time output by F8 and F9

K,N,S,W View the current estimated worst case time error

K,N,S,W View the XLi’s software version information

K,N,S,W Manage the Frequency and Time Deviation Monitor card

“F42 – Multicode Output Configuration”, page 69

“F44 – N.8 Frequency Synthesizer”, page 73

“F50 – GPS Receiver LLA/XYZ Position”, page 75

“F51 – GPS Antenna Cable Delay”, page 77

“F52 – Distribution Cable Delay”, page 78

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K,N,S,W Set the time code type and time reference for specific ports

on the optional Multicode Output card(s)

K,N,S,W Set the frequencies generated by specific ports on the

optional N.8 Frequency Synthesizer card(s)

K,N,S,W View the Latitude/Longitude/Altitude or geocentric X/Y/Z

coordinates of one or more GPS antennas.

K,N,S,W Compensate for the delay caused by the length of the GPS

antenna cable. (Use F52 to adjust timing outputs.)

K,N,S,W Compensate for the length of the distribution cable on J2.

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“F53 – GPS Operation Mode”, page 80

“F60 – GPS Receiver Satellite List”, page 81

“F66 – Daylight Saving Time (DST) Mode”, page 84

“F67 - Manual Leap Second Entry”

“F69 – Time Mode”, page 89

“F71 – Oscillator Statistics”, page 91

“F72 – Fault Status”, page 92

“F73 – Alarm Control / Status”, page 94

“F74 – Clock Source Control”, page 107

“F77 - PTTI Output”

“F78 - Parallel BCD Output”

K,N,S,W Operate specific GPS receivers in Auto Mode for static

applications, or in Dynamic Mode for mobile applications.

K,N,S,W View a list of current and tracked satellites.

K,N,S,W Schedule when DST starts and ends (Local time only)

K,N,S,W Manually schedule in section of leap seconds.

K,N,S,W Set the type of time (GPS, UTC, Standard, Local) displayed

on the front panel of the XLi

K,N,S,W Display the XLi oscillator’s phase, offset, drift, and DAC

values

K,N,S,W View clock and power supply fault status

K,N,S,W View the status of all the alarm indicators. Enable/disable

alarms for each indicator. Set alarm thresholds. Enable or disable LED blink

K,N,S,W Select the pattern of switching between reference sources

K,N,S,W Configure and display status of PTTI card.

K,N,S,W Configure and display status of Parallel BCD Output board.

“F90 – Code Output Configuration”, page 116

“F100 – Network Port Configuration & XLi Firmware”, page 117

F100 EA – Ethernet Address

F100 IP – IP Address

F100 SM – Subnet Mask

F100 G – Gateway

F100 IC – Network Port Settings

F100 BASET – 10/100 BASE- T

F100 L/LOCK/UNLOCK – Remote Lockout

F100 L – Remote Lockout

F100 ST – Self Test Status

F100 BH – Burn Host

F100 BUB – Burn BootLoader

K,N,S,W Configure settings for CODE – time code output

K,N,S,W Configure the standard network port settings

K,N,S,W Display the Ethernet (MAC) address

K,N,S,W Configure the IP address

K,N,S,W Configure the subnet mask

K,N,S,W Configure the default gateway

K,N,S,W Display all the standard network port’s settings

K, N, S View network port setting

K,N,S Lock remote access to the XLi’s standard network port

K,N*,S Display the status of F100 LOCK

*Locked through the network port, serial port, and keypad. Can be unlocked only through the keypad or serial port.

K,N,S Display the XLi’s self test results for Flash CRC, RAM,

Serial Port, and NVRAM

N,S*

Upgrading system firmware: select the FTP host, path, and filename of the system firmware

Upgrading system firmware: ‘burn’ the bootloader file (*.bt) selected using F100 BH to flash memory

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F100 BU – Burn

F100 BF – Burn File System

F100 BUFP – Burn FPGA Firmware

F100 CONFIG – Configure NTP & SNMP

N,S*

N,S,W*

Upgrading system firmware: ‘burn’ the system firmware file (*.bin) selected using F100 BH to flash memory

Upgrading system firmware: ‘burn’ the file system file (*.fs) selected using F100 BH to flash memory

Upgrading system firmware: burn the FPGA program file (*.bin) selected using F100 BH to the flash memory

Transfer the NTP and SNMP configuration files between the XLi and an FTP server for editing

F100 J – Factory Mode Jumper

F100 K I L L – Reboot

F100 P – Change User Password

F100 PI – PING

F100 PN – Change User Name

F108 – Oscillator Configuration

F110 – J1 Input (Time Code, TIET)

F111 – J2 Output (Rate, PPO)

F113 – J3 Input (Aux Ref, Freq Meas)

F116 – Display Brightness Level

F117 – Factory Configuration

F118 – Option Board Configuration

F119 – GPS Receiver Configuration

F120 - N.1 Frequency Synthesizer

N,S View the status of the factory mode jumper, which is used

by factory technicians. Not of interest to most end users.

N,S Reboot the XLi

N,S,W Change the XLi password

N,S Ping from the XLi to another host on the network

N,S,W Change the User Name

K,N,S,W View the oscillator type

K,N,S,W Configure the J1 input connector

K,N,S,W Configure the J2 output connector

K,N,S,W Configure the J3 input connector

K Set the brightness of the display on the XLi’s front panel

K,N,S,W View some of the factory settings such as the serial

number or NTP state

K,N,S,W View the contents of each option bay. Only recognizes

certain cards

K,N,S,W Configure and display status for GPS Receivers

K,N,S,W Configure and display status of the N.1 card

F123 – Have Quick Input/1 PPS Sync Configuration

F126 – Options Key Entry

F128 – Have Quick Output Configuration

a.The web interface makes it convenient to edit the SNMP and NTP configuration files directly in the browser. Symmetricom recommends this approach versus the more complicated approach of transferring configuration files to an FTP server. b. The web interface makes it convenient to upgrade system firmware directly from the web browser. Symmetricom recommends this approach versus the serial/network command line method.

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K,N,S,W Configure and display status of Have Quick/1 PPS card

K,N,S Enable an XLi option by entering a software key

K,N,S,W Configure and display status of Have Quick Output board.

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F1 – Time Zone Offset

Use function F1 to display and set the time zone offset between your Standard Time zone and Universal Time Coordinated (UTC). Refer to “F: World Map of Time Zones:” on page 291

Standard Time and Local Time used by F69. For an expanded explanation of Local, Standard, UTC, and GPS time, see “F69 – Time Mode” on page 89

For example, to set the time zone for Pacific Standard Time (UTC –8 hours), set the value in F1 to – 08:00. Do not include the 1-hour Daylight Saving Time (DST) offset in this value. DST is handled separately by “F66 – Daylight Saving Time (DST) Mode” on page 84

Because the front panel display and Multicode Output card can be configured to display/distribute Local or Standard time, we recommended configuring F1 as described in the “3: Installation/Configuration” on

page 19.

The factory setting for F1 is UTC –8:00 hours (Pacific Standard Time).

Related topics (Time Error):

• “F13 – Time Error” on page 61

• “F71 – Oscillator Statistics” on page 91

displays the current time error

provides the DAC value

Command Line

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

F5<CR>

XLi responds The XLi responds:

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

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where:

F = ASCII character F

05 = function number

<S> = ASCII space character (one or more)

<SEP> = 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> = carriage return character

<LF> = line feed character

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

F5<CR>

XLi responds:

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

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

F5 ENABLE 2000 20000 200000 2000000<CR>

XLi responds:

OK<CR><LF>

Note: Leading zeros aren’t required for to enter new settings, but are included in readouts of the settings.

F6 – Keypad Lock

F6 – Keypad Lock enables or disables the keypad, preventing accidental changes to the XLi’s settings. When enabled, the display responds ‘KEYPAD LOCKOUT BY FUNC 6’ when the user attempts to access any function other than F6 setting for F6 – Keypad Lock is disabled.

. F6 remains available through the keypad at all times. The factory

Command Line

To display the Keypad Lock status, send:

F6<CR>

XLi responds:

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

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where:

F = ASCII character F

6 = function number

<S> = ASCII space character (one or more)

<STATE> = ENABLE or DISABLE

<CR> = carriage return character

<LF> = line feed character

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

F6<CR>

XLi responds:

F6 DISABLE<CR><LF>

To enable Keypad Lock, send the following string:

F6 ENABLE<CR>

XLi responds:

OK<CR><LF>

To disable Keypad Lock, send the following string:

F6 DISABLE<CR>

XLi responds:

OK<CR><LF>

F8 - Continuous Time Once-per-Second

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 XLi's command line interface (available from the serial or network ports). The format and type of time can be modified using F2, F11, and F69.

The command line (standard out) outputs the <CR> character at the end of the time-of-year string at the 1 PPS mark, +/- 1 millisecond.

If F8 is used following startup, while the XLi is acquiring a reference source, F8's displays time-of-year information from the XLi's unsynchronized system clock. When the system clock acquires a reference source and synchronizes with it, F8 displays the new time-of-year information. The transition looks like this:

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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 XLi system clock is not locked to a reference source. As the XLi locks to the reference source, the "?" disappears. After a couple seconds, the new synchronized time-of-year

information appears.

If the reference source becomes unavailable, F8 continues generating time-of-year information based on the synchronized time, and the character for the first time quality flag typically appears as the time error starts increasing.

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" (described in the XLi manual). The default output string format is:

where:

<SOH> = ASCII Start-of-Heading character

<CR> = ASCII Carriage Return character

<LF> = ASCII Line Feed character

DDD = day-of-year.

HH = hours.

MM = minutes.

SS = seconds.

mmm = milliseconds.

: = colon separator.

Q = 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

or a reference source is unavailable

The four time quality thresholds are set by F5 - Time-Quality Setup. See "F13 - Time Error" in the standard XLi User Guide for more information.

Command Line

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

F8<CR>

The XLi replies:

199:11:19:30<CR><LF> 199:11:19:31<CR><LF> 199:11:19:32<CR><LF>

To stop F8 Continuous Time Once-Per-Second, press Ctrl-C on your keyboard (hex 03).

F9 - Time On Request

This function is available through the command line interface only. It is not available from the keypad.

Use function F9 to record the exact time the XLi receives a request from the user.

Enter the command "F9<CR>" to prepare the XLi for the user's request. At the desired moment, send the request to the XLi by entering an upper case "T". The XLi saves the current time-of-day, accurate to within 1μS, to a buffer, and then outputs it to the command line interface. The XLi continues to provide the time-of-day each time it receives a "T" until F9 is cancelled. To cancel F9, enter Ctrl-C on your keyboard. The command line disregards all input other than SHIFT-T and Ctrl-C (hex 03).

The time-of-day output is only available on the network or serial port used to give the F9 command.

F9’s default output string is as follows:

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where:

<SOH> = ASCII Start-of-Heading character

<CR> = ASCII Carriage Return character

<LF> = ASCII Line Feed character

YYYY = year

DDD = day-of-year.

HH = hours.

MM = minutes.

SS = seconds.

mmm = milliseconds.

: = colon separator.

Q = 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). XLi responds:

To exit F9 press Ctrl-C on your keyboard.

F11 - Time Output Format

Use function F11 to change the format of the F8 and F9 time output strings. The factory setting for F11 format is null, which enables the default time output formats for F8 and F9:

<SOH>DDD:HH:MM:SSQ<CR><LF> (for F8) <SOH>DDD:HH:MM:SS.mmmQ<CR><LF> (for F9)

To display the default format for F11, enter:

F11

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F11 responds:

F11 DDD:HH:MM:SS.mmmQ

where:

<SOH> = ASCII Start-of-Heading character

<CR> = ASCII Carriage Return character

<LF> = ASCII Line Feed character

DDD = day-of-year.

HH = hours.

MM = minutes.

SS = seconds.

mmm = milliseconds.

: = colon separator.

Q = 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

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

Suppress the “DDD”, “HH”, “MM”, “SS”, “mmm”, and “Q” segments of F11 by placing an “X” (Shift-X) in the leading position of any segment, followed by any placeholder characters, and the following separator. For example, to suppress “DDD”, enter:

F11 X--:

To see the resulting change to F11, enter:

F11

F11, with “DDD” suppressed, responds:

F11 XDD:HH:MM:SS.mmmQ

With “DDD” suppressed, the output of F8 would look like this example:

:16:23:32*

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Ending a format string early (no “:” or “.” separator at the end) with a carriage return, enables the remaining un-typed characters. This makes it easy to restore the default F11 formatting.

To return F11 to its default format, enter:

F11 D

To display the restored defaults, enter “F11” again. F11 responds:

F11 DDD:HH:MM:SS.mmmQ

The “DDD”, “HH”, “MM”, “SS”, “mmm”, and “Q” segments can not be replaced with characters, they can only be suppressed.

The “:” and “.” separators can be replaced with ASCII characters or suppressed using “X”. For example, to replace the separators with characters, enter:

F11 ---D--H--M--S

When you check the results by entering “F11”, F11 responds:

F11 DDDDHHHMMMSSSmmmQ

With the new formatting, F8 displays:

128D16H41M27*

And F9 displays:

365D16H45M22S680*

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 “System Time & Frequency Accuracy” on page 6 information on time error for different reference sources. Time error begins to accumulate when the receiver loses lock to a reference source. The XLi 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>

The XLi responds:

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

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where:

F13 = ASCII string for function F13

<S> = ASCII space character

<ERROR> = calculated worst-case error in seconds

<CR> = carriage return character

<LF> = line feed

For example, to display the time error, enter:

F13<CR>

XLi 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 XLi:

• 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>

The XLi responds:

F18 BOOTLOADER 192-8000 SOFTWARE 192-8001 FILE SYSTEM 192-8002v1.80 PROJ REV # 2-1 FPGA # 184-8000V50

Note: The values will be different from this example representing the current values.

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F27 – FTM III Configuration

Use F27 to manage the Frequency and Time Deviation Monitor (87-8023) option card (page 192).

Keypad

The UP ARROW DOWN ARROW keys are used to scroll between the selections, and the ENTER key is used to access the currently displayed selection (numeric keys are placed in <> brackets for clarity).

After accessing a particular selection, information can be entered by scrolling to a desired value via UP ARROW and DOWN ARROW keys or by directly entering the desired value. The specific data entry method is dependent upon the particular selection.

Pressing the TIME or STATUS keys aborts the keypad function without affecting the current entry value.

Operation of Keypad F27 is detailed in the following paragraphs.

Press ENTER <2> <7> to access the FTM. The front panel 2-line VFD displays the following title.

FTM Availability OPTION BAY <N>

Use UP ARROW and DOWN ARROW to select an FTM, and press ENTER.

Time and Frequency Deviation Display

This display is only informational. ENTER to continue to the next display or CLR to begin again.

Time Deviation Offset Entry

This display shows the current preset value for time deviation offset. This value is set by the user and does not change until changed by the user. Press UP to edit the value and/or reset the accumulated time deviation.

UP followed by ENTER does not change the time deviation offset, but resets the accumulated time deviation to that value. The four arrow keys and the numeric keys are used to edit the time deviation offset entry. ENTER exits this display and steps to the next.

•Time Deviation

•Entry

• Front Panel

• VFD Setup

• Front Panel

• Display Port

• RS-422 Setup

• Display Port

• Data Addr Setup

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• Continue With Current Setup

If the ENTER key is pressed at this time, the FTM will begin displaying information using the current user configuration.

Line Frequency Entry

Pressing ENTER at this point allows the user to scroll between 50 or 60 Hz for the Line Frequency to be measured. The selection process is performed by pressing the UP ARROW or DOWN ARROW until the desired frequency is displayed. At that time, pressing the ENTER key selects the displayed frequency and returns to the Line Frequency Entry display.

Time Deviation Entry

Pressing ENTER at this display allows the user to input a Time Deviation Preset value. The range is +99.999 to -99.999 s. The number keys are used to enter the desired value, the LEFT ARROW and RIGHT ARROW keys may be used to move the cursor, and the UP ARROW and DOWN ARROW keys are used to change the sign of the value. Pressing the ENTER key will load the displayed Time Deviation Preset into the FTM and reset the accumulated Time Deviation to the newly entered value. THIS FUNCTION PERFORMS A RESET OF ACCUMULATED TIME DEVIATION. If this function has been entered in error, simply press the TIME or STATUS buttons to exit the function without changing the preset value.

Front Panel Display Setup

Pressing ENTER at this display allows the user to select which data is to be displayed on the XLi’s front panel display. The three selections are Time and Frequency Deviation, System Frequency, and Local Time. Scroll to display the desired data then press ENTER to select.

FTM RS-422 Display Port Setup

Press ENTER at this display to configure the FTM RS-422 display port. The factory default values are:

• Baud Rate - 9600

•Data Bits - 8

• Parity - none

•Stop Bits - 1

The default values on subsequent power-ups will be those in use prior to the previous power-down. Using the UP ARROW and DOWN ARROW keys, scroll to the desired setting then press the ENTER key to accept the currently displayed setting. When all parameters are entered, the display returns to FTM RS-422 Display Port Setup.

NOTE: Stop Bits is 1 when data bits is 8 and parity is selected.

Display Port Data Address Setup

Pressing ENTER at this display allows the user to set data addresses for all five data values transmitted out the FTM Display Port.

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At each data value prompt, enter the desired address for that data value. A negative sign preceding the address indicates that the data value is not to be transmitted.

Disabling data transmission is a useful feature if a non-addressable display is connected to the display port. By placing a minus (-) sign in front of 4 of the 5 data value addresses, only one data value will be transmitted, thus allowing the user to select a value to be displayed on the non-addressable display.

The UP ARROW or DOWN ARROW key is used to change the sign of the address. The LEFT ARROW and RIGHT ARROW keys may be used to move the cursor. Prior to accepting the displayed value, if the originally displayed value was the correct value, pressing the CLR button will restore it. Pressing the ENTER button accepts the displayed value. The next data value address is then displayed until all five addresses have been entered. The address range is from 0 to 255. Placing a (+) in front of the address enables the data for transmission, while placing a (-) in front of the address inhibits the data from being transmitted.

The settings should be set as follows:

PORT DATA ADDR CONFIG TIME DEVIATION ADDR +022

PORT DATA ADDR CONFIG FREQ DEVIATION ADDR +021

PORT DATA ADDR CONFIG SUYSTEM FREQUENCY ADDR +020

PORT DATA ADDR CONFIG LOCAL TIME ADDR +024

PORT DATA ADDR CONFIG SYSTEM TIMEADDR +023

Command Line

The FTM can output the following data once-per-second or on demand:

• Local Time

•Time Deviation

• Frequency Deviation

• System Frequency

•System Time

Additionally, the user can configure which data is included in the once-per-second output.

In the following paragraphs <cr><lf> represents the carriage return and linefeed characters, and single ' and double " quotes are used to delimit character strings. The single ' and double " quotes are for text clarity and are not to be sent to the FTM F27.

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To exit once-per-second or Time On Demand Output, a <^C> (Ctrl+C) character must be sent to the command line. All other commands automatically exit after completion.

The command line (standard out) outputs the <CR> character at the end of the once-per-second string at the 1 PPS mark, +/- 1 millisecond.

Serial Port Commands:

F27 B<N> <cr><lf> User formatted once-per-second output

F27 B<N> FS<cr><lf> Request user format string

F27 B<N> FS X,X,X,X,X<cr><lf> Set user format string

F27 B<N> TD<cr><lf> FTM data on demand output

F27 B<N> PS<cr><lf> Request Time Deviation Preset value

F27 B<N> PS +99.999<cr><lf> Set Time Deviation Preset value

Where: B<N> is the option Bay Number where the FTM card is installed.

F27 B<N> <cr><lf> User formatted once-per-second output

When the XLi receives the "F27 B<N> <cr><lf>" string, the FTM card begins sending user selected data at a once-per-second rate. The rising edge of the start bit of the last <CR> in the string is sent on time. If all information is enabled for transmission, the formatted string is as follows:

DDD:HH:MM:SSQTsDS.thmFsU.thmSFDU.thmSTHH:MM:SS.thm<CR><LF>

For example:

068:12:17:55?T-01.537F+0.123SF+60.095ST12:17:53.463<CR><LF>

where:

DDD:HH:MM:SS Local Time of Day through seconds

Q XLi Time Quality Indicator

TsDS.thm Time Deviation Through milliseconds.’T' begins the accumulated Time Deviation in

seconds.

FsU.thm Frequency Deviation through millihertz. ‘F’ begins Frequency Deviation in Hz from

nominal, where a positive (+) value represents a frequency higher than nominal.

SFDU.thm System Frequency through millihertz. ‘SF’ begins the System Frequency, Hz. System

frequency is measured over a 1 second period.

STHH:MM:SS.thm System Time through milliseconds. ‘ST’ begins System Time, Day of Year through

milliseconds, the time a clock would display if the line voltage were used as its timing reference.

<CR><LF> End of line carriage return at 1 PPS mark, +/- 1 millisecond.

To exit F27 once-per-second mode, transmit a <^C> (Ctrl+C) character to the XLi.

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F27 B<N> FS<cr><lf> FORMAT SELECT once-per-second DATA

The data that is transmitted once-per-second via the "F27 B<N> <cr><lf>" command can be selected by the user. Using this command, all FTM-II and FTM-I formatted strings can be emulated.

Data transmitted out the serial port is in the following order: Local Time, Time Deviation, Frequency Deviation, System Frequency, and System Time. Each datum can be deselected for output using the format string (X,X,X,X,X). e.g.,

Local Time

X,X,X,X,X

Entering an "F27 B<N> FS<cr><lf>" requests the current format string in use by the FTM serial port. The serial port responds with the current format string. An example follows:

The X's represent data enabled for output. A format string with Local Time and System Time deselected would be ",X,X,X,". Note the absence of X's in those positions.

To deselect all but Time Deviation and Frequency Deviation, the following command line and FTM card response is as follows:

The commas are necessary placeholders and the X's are in the Time Deviation and Frequency Deviation positions.

Time Deviation

F27 B<N> FS<cr><lf>user entry (requests current format)

F27 B<N> FS X,X,X,X,X<cr><lf>FTM response

"F27 B<N> FS ,X,X,<cr><lf>"

"F27 B<N> OK<cr><lf>"

Frequency Deviation

System Frequency

System Time

Subsequently, when "F27 B<N> <cr><lf>" is sent requesting the once-per-second Mode, only Time Deviation and Frequency Deviation is transmitted once-per-second.

T-00.432F-0.003<cr><lf> T-00.432F-0.003<cr><lf>

F27 B<N> PS<cr><lf> REQUEST TIME DEVIATION PRESET VALUE

To request accumulated Time Deviation, enter:

F27 B<N> PS<cr><lf>

F27 B<N> PS +99.999<cr><lf> SET TIME DEVIATION PRESET VALUE

Accumulated Time Deviation can be preset to a given value in the range of +99.999 to -99.999 seconds. When executed, this command presets the accumulated Time Deviation value to the entered value. All previously accumulated Time Deviation is lost. Example sessions follow:

Preset accumulated Time Deviation to -1.0 seconds. Enter:

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F27 B<N> PS -1.00<cr><lf>

Response:

OK<cr><lf>

Request current Time Deviation Preset Value. Enter:

F27 B<N> PS <cr><lf>

Response:

F27 B<N> PS= -1.00<cr><lf>

Preset accumulated Time Deviation to 0.0 seconds. Enter:

F27 B<N> PS 0<cr><lf>

Response:

OK<cr><lf>

Preset accumulated Time Deviation to 100.0 seconds. Enter:

F27 B<N> PS 100<cr><lf>

Response:

ERROR 01 VALUE OUT OF RANGE<cr><lf>

F27 B<N> TD<cr><lf> DATA ON DEMAND OUTPUT

The Data On Demand Output allows the user to request a single measurement by sending an upper case "T<cr><lf>" while in the "F27 B<N> TD" mode. Subsequent receipts of the letter T (without the carriage return linefeed combination) are responded to with the current data values.

Local Time of receipt of the 'T' to the millisecond is recorded, System Time is calculated from the recorded Local Time, and the complete FTM data string is transmitted back to the user. An example session follows:

F27 B<N> TD<cr><lf> T 069:15:25:27.545QT+00.477F-0.011SF+59.989ST15:25:28.022 T 069:15:25:31.932QT+00.477F-0.013SF+59.987ST15:25:32.409 T 069:15:25:32.524QT+00.476F-0.012SF+59.988ST15:25:33.000 ^C OK<cr><lf>

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SSSSSSSSSSSS SSSSSSSSSS SSSSSSS S SSS S SSSSS S

The Time On Demand string contains an additional four characters representing the decimal point and milliseconds of the Local Time at the time of receipt of the 'T'.

Exit F27 B<N> TD mode by entering a ^C or Ctrl+C.

F42 – Multicode Output Configuration

Use function F42 to view or set up the time-code outputs of the Multicode Output (87-6002-

XL1) (page 171).

• Board #: Identifies the card to which the following settings will apply. (Select between multiple cards using the UP/DOWN ARROWs buttons on the keypad). The card number is determined by the position of DIP switches on the Multicode card. Each card must have a unique number. (See “Installation” on page 171)

• Output #: Identifies the output to which the settings apply (e.g., J1 through J4)

• Code: The time code output by the port. The note below provides a complete list of all the time code types available.

• Time Reference: The type of time (e.g., UTC, Standard, Local, GPS) output by all ports on the card. Even though this setting is shown for a specific output, it sets the type of time for all ports.

Notes:

• The code output types include: IRIG-A 130, IRIG-A 133, IRIG-B 120, IRIG-B 123, IRIG-E 111, IRIG-E 112, IRIG-E 121, IRIG-E 122, IRIG-G 141, IRIG-G 142, IRIG-H 111, IRIG-H 112, IRIG-H 121, IRIG-H 122, 2137, XR3, NASA 36.

• If IRIG-A 130 or IRIG-A 133 is selected as the output type for a specific port, all other ports set for IRIG-A will be ‘bumped’ to the same type (130 vs. 133). Ports set to other time code types (e.g., IRIG-B) are not affected.

• The same is true for IRIG-G. If IRIG-G 141 or IRIG-G 142 is selected as the output type, all the other ports set for IRIG-G will be ‘bumped’ to the same type (141 vs. 142). Ports set to other time code types (e.g., IRIG-B) are not affected.

• For more information on the code output types, see “E: Time Code Formats” on page 287.

• For Time Reference, the following is a summary explanation of the different types of time:

- UTC (Coordinated Universal 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. It doesn’t contain 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. See “F: World Map of Time Zones:” on page 291

- Local time is UTC plus a time zone adjustment and a Daylight Saving Time adjustment.

•See “F69 – Time Mode” on page 89 Note, however, that F69 does not affect F42 or the Multicode Output card.

for an expanded explanation of the different types of time.

for more information.

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Command Line

Requesting the board number of installed cards

Use F42 to set up the output on the Multicode Output card(s). Use the following format to request the board number(s) of the installed card(s):

F42<CR><LF>

The XLi responds using the following format:

F42<S>B<S><N><CR><LF> (one board installed)

F42<S>B<S><N><S><N>...<CR><LF> (two or more boards installed)

where:

F42 = ASCII string representing the Function Number

<CR> = carriage return character.

<LF> = line feed character.

<S> = space character

B = ASCII character B

N = the board number of a multi code card, 1 to 10

... = Multiple occurrences of <S><N> corresponding to the

number of boards present

For example, enter:

F42<CR>

The XLi responds that one board, board 2 in this case, is present:

F42 B 2<CR><LF>

Or, that multiple boards, boards 2 and 4 in this case, are present:

F42 B 2 4<CR><LF>

Or, that no boards are present:

NO MULTICODE BOARDS

Requesting the time code settings of a specific output port

Use the following format to request the time code settings of a specific output on a specific card:

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F42<S>B<N>O<S><C><CR>

where

F42 = ASCII string representing the Function Number

<S> = one or more separator characters, space, tab or comma

B = ASCII character indicating board number to follow

<N> = the board number, 1 to 10

O = ASCII letter “ohh” indicating output port (not zero)

<C> = output number, 1 to 4

<CR> = carriage return

For example, to request the time code on board 1, output 1, enter:

F42 B1O 1<CR>

Or, optionally:

F42 B1 O1<CR>

The XLi responds with the time code of the output:

F42 B1 1 IRIG-B 120<CR><LF>

If the time code is IRIG-A or IRIG-G, the response includes a parenthetical reminder that all outputs set to that time code (e.g., IRIG G) are also set to the same time code type (e.g., 141):

F42 B1 1 IRIG-G 141(ALL "G" PORTS)

Setting the time code of a specific output port

Use the following format to set the time code for a specific output port:

F42<S>B<N><S>O<S><C><S><CODE><CR>

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where:

F42 = string representing the Function Number

<S> = separator

B = ASCII letter indicating board number follows

<N> = board number, 1 to 10

O = ASCII letter indicating output port

<C> = channel number, 1 to 4

<CODE> = IRIG-A 130, IRIG-A 133, IRIG-B 120, IRIG-B 123, IRIG-E 111, IRIG-E 112, IRIG-E 121, IRIG-E

122, IRIG-G 141, IRIG-G 142, IRIG-H 111, IRIG-H 112, IRIG-H 121, IRIG-H 122, 2137, XR3, NASA 36 Note: A dash is required when entering IRIG types. NASA 36 is entered without a dash. 2137 and XR3 have no dashes or spaces when entered.

<CR> = Carriage Return

For example, to set board 1, output 1, to IRIG-B 123, enter:

F42 B1 O 1 IRIG-B 123<CR>

The XLi responds:

OK<CR><LF>

Setting a port to IRIG-A switches all output ports set to IRIG-A to the same IRIG-A type (e.g., IRIG-A

133). The same is true for IRIG-G. Therefore the following example would set all of board 1’s IRIG-A outputs, not just output 1, to IRIG-A 133 time code:

F42 B1 O 1 IRIG-A 133<CR>

The XLi responds:

OK<CR><LF>

Requesting the time reference of a specific board

Use the following format to request the Time Reference of a specific board:

F42<S>B<N>T<CR>

where

<N> = board number, 1 to 10.

<S> = ASCII space character.

T = ASCII letter requesting Time Reference.

The XLi responds with the Time Reference for the selected board.

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For example, to requests the time reference from board 1, enter:

F42 B1 T<CR>

The XLi responds:

F42 B1 UTC<CR><LF>

Setting the time reference of a specific board

Use the following format to set the type of time output by the boards (For an explanation of the different types, see “F69 – Time Mode” on page 89

F42<S>B<N><S>T<S><TREF><CR>

where

F42 = string representing the Function Number

B = ASCII character indicating board number to follow.

<N> = the board number, 1 to 10

<S> = one or more separator characters, space, tab or comma.

<TREF> = Time Reference, UTC, LOCAL, STANDARD, or GPS

For example, to have board 1 (all ports) output local time instead of UTC, enter:

F42 B1 T LOCAL<CR>

The XLi responds:

OK<CR><LF>

F44 – N.8 Frequency Synthesizer

Use function F44 to select the N.8 rate for a specific output port on a specific N.8 Frequency Synthesizer

(86-708-1) (page 174). The N.8 output frequencies range from 8 kPPS to 8192 kPPS.

Command Line

Use the following format to enter the F44 command. In response, the XLi displays the card addresses of the installed N8 cards:

F44<CR>

XLi responds with the card numbers in using the following format:

F44<S><N><S><N><CR><LF>

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where

F44 = ASCII string indicating function 44

<S> = space or separator

<N> = the card numbers of one or more N.8 cards separated by spaces

<CR> = Carriage return

<LF> = Line feed

For example, enter:

F44<CR>

XLi responds with the card numbers:

F44 02 04<CR><LF>

To see the frequency settings of all port settings on a specific card, enter:

F44 B3<CR>

XLi responds (card #3 –- example settings):

F44 B3 1 2048 2 1000 3 0512 4 0008<CR><LF>

To display the frequency of a specific output ports (card #3, port #4), enter:

F44 B3 4<CR>

XLi responds:

F44 B3 4 0008<CR><LF>

To set the frequency of one of the output ports use the following format:

F44<S>B<N><SEP><C><SEP><FREQ><CR>

where

<S> = ASCII space character one or more

B = ASCII “B” character

<N> = The card number

<SEP> = Space separator

<C> = The port number

<FREQ> = The N.8 frequency (from 8 to 8192 kPPS in 8 kPPS steps)

<CR> = Carriage Return

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To set the frequency of one of the output ports (card #2 port #1 to 8 kPPS), enter:

F44 B2 1 8<CR>

XLi responds:

OK<CR><LF>

To set all four ports on a card with one serial string, enter:

F44 B1 1 1000 2 2000 3 2048 4 16<CR>

This sets the ports on card #1 as follows:

• Port #1 to 1000 kPPS

• Port #2 to 2000 kPPS,

• Port #3 to 2048 kPPS,

• Port #4 to 16 kPPS.

F50 – GPS Receiver LLA/XYZ Position

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

• Display the option bay location of the GPS receiver(s). If multiple GPS receivers are available, use the UP/DOWN ARROW keys to select a receiver.

• Select the positional coordinate system, Latitude Longitude Altitude (LLA) or XYZ (EarthCentered, Earth-Fixed XYZ coordinates).

• If LLA is selected, Altitude Mode shows the elevation in given meters.

Command Line

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

in LLA coordinates:

F50<S>B<N><SEP>LLA<CR>

XLi responds with the coordinate information in the following format:

F50<S>B<N><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.

B = ASCII letter to denote Option Bay number follows

<N> = Option Bay Number, 1 through 10.

<SEP> = Separator

LLA = LLA mode

<CR> = carriage return character.

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

<DEG> = two-digit degrees for latitude or three-digit degrees for longitude.

d = 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 connected to card #2, enter:

F50 B2 LLA<CR>

XLi responds:

F50 B2 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>B<N><SEP>XYZ<CR>

XLi responds using the following format:

F50B<N><S><SIGN><S><MX>m<S><SIGN><S><MY>m<S><SIGN><MZ>m<CR><LF>

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where:

F = ASCII character F

50 = function number

<S> = ASCII space character

B = ASCII letter to denote Option Bay number follows

<N> = Option Bay Number, 1 through 10.

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

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

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

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

m = ASCII character m for Meters

<ALT> = altitude in meters

<CR> = carriage return character

<LF> = line feed character

For example:

F50 B2 XYZ<CR>

XLi responds:

F50 B2 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. When multiple GPS receivers are installed, a separate value can be set for each unique 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.

• Avoid using function F51 to adjust the XLi’s timing outputs; use F52 Distribution Cable Delay instead.

Command Line

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

F51<S>B<N><CR>

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The XLi responds using the following format:

F51<S>B<N><SEP><SIGN><DELAY>ns<CR><LF>

where:

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

51 = the function number.

<S> = ASCII space character one or more.

B = ASCII letter to denote Option Bay number follows

<N> = Option Bay Number of the GPS option card, 1 through 10.

<CR> = carriage return character.

<SEP> = one or more space characters.

<SIGN> = either + or blank

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

ns = nanoseconds (ns or NS for input string).

<LF> = line feed character.

For example, to see the antenna cable delay for the GPS card in option bay 4, enter:

F51 B4<CR>

XLi responds:

F51 B4 +000060ns<CR><LF>

To set the antenna cable delay for an option card, use the following format:

F51<S>B<N><S><DELAY>NS<CR>

For example, to set the antenna cable delay for the GPS card in option bay 4 to 100 nS, enter:

F51 B4 100NS<CR>

XLi responds:

OK<CR><LF>

F52 – Distribution Cable Delay

Use function F52 to display or set the distribution cable delay for the time code and 1 PPS outputs. F52 compensates for the signal’s travel time from the XLi 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 XLi responds using the following format:

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

where:

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

52 = the function number.

<S> = one or more space characters.

<SIGN> = either + or –

<D> = 1 to 6 digit delay from +999999 nS to –999999 nS

ns = nanoseconds (ns or NS for input string)

<CR> = carriage return character

<LF> = line feed character

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

F52<CR>

XLi responds:

F52 +000000ns<CR><LF>

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

F52 +000060nS<CR>

XLi responds:

OK<CR><LF>

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F53 – GPS Operation Mode

Use function F53 to set the operation mode for all receiver types except the 86-8013, which doesn’t have modes. (If the 86-8013 is the only receiver available, F53 reports “GPS Availability, Not Available”.)

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

• 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 XLi 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 calculate the time precisely and accurately. TRAIM is also supported in Time Mode only.

Keypad

While viewing the Status screen on the XLi front panel display, press the following keypad buttons:

ENTER 53 ENTER

has two modes:

If an GPS C/A Receiver (87-8028-2) is available, F53 displays:

GPS C/A AVAILABILITY OPTION BAY #

Where # is the option bay number the card is located in. (If no GPS is available, F53 displays “GPS AVAILABILTY, NOT AVAILABLE”). If more than one GPS is present, use the UP/DOWN ARROW buttons to select the option bay location of a specific card.

To view the mode the GPS is in, press ENTER again, and F53 displays the current mode:

GPS MODE SELECT AUTO MODE (or DYNAMIC MODE)

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

SAVE CHANGES? YES

To save changes, press ENTER.

Command Line

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

F53 B<N>

F53 responds using the following format:

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

where:

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

53 = the function number.

<SP> = ASCII space character one or more.

B = ASCII letter to denote Option Bay number follows

<N> = Option Bay Number, 1 through 10.

<SEP> = one or more space characters.

<STATUS> = DYNAMIC MODE or AUTO MODE

<CR> = carriage return character.

<LF> = line feed character.

For example, enter:

F53 B1

Example response:

F53 B1 AUTO MODE (or DYNAMIC MODE)

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

F53<SP>B<N><SEP><MODE><CR><LF>

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

For example, enter:

F53 B1 DYNAMIC MODE

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

GPS satellite are grouped into the following categories:

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

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

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

• Rejected: the XLi GPS 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 21.

If multiple GPS receivers are installed in the XLi, F60 identifies the GPS receiver by the option bay number in which it is located. For a diagram of option bay numbers, see “F118 – Option Board

Configuration” on page 152.

If you’re using the keypad/display 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>B<N><SEP><TYPE><CR>

XLi responds with approximately 32 lines that use the following format:

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

where:

F60 = ASCII string indicating function F60.

<S> = ASCII space character one or more.

B = ASCII letter to denote Option Bay number follows

<N> = Option Bay Number, 1 through 10.

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

<TYPE> = ALL, CURRENT, or TRACKED.

<CR> = Carriage return character.

prn = 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:

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F60 B1 ALL<CR>

XLi responds:

F60 B1 prn1 good current -159dBW F60 B1 prn2 good current -162dBW F60 B1 prn3 good current -163dBW F60 B1 prn4 unknown F60 B1 prn5 unknown F60 B1 prn6 unknown F60 B1 prn7 unknown F60 B1 prn8 good current -161dBW F60 B1 prn9 unknown F60 B1 prn10 unknown F60 B1 prn11 unknown F60 B1 prn12 unknown F60 B1 prn13 good current -159dBW F60 B1 prn14 unknown F60 B1 prn15 unknown F60 B1 prn16 unknown F60 B1 prn17 unknown F60 B1 prn18 unknown F60 B1 prn19 unknown F60 B1 prn20 unknown F60 B1 prn21 unknown F60 B1 prn22 good current -164dBW F60 B1 prn23 unknown F60 B1 prn24 unknown F60 B1 prn25 unknown F60 B1 prn26 unknown F60 B1 prn27 good current -156dBW F60 B1 prn28 unknown F60 B1 prn29 unknown F60 B1 prn30 unknown F60 B1 prn31 unknown F60 B1 prn32 unknown

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

F60 B1 CURRENT<CR>

F60 B1 TRACKED<CR>

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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 the DST period span the New Year.

Command Line

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

F66<CR>

XLi responds using the following format:

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

where:

F = ASCII character F

66 = function number

<S> = ASCII space character one or more.

<STATE> = Off or Manual.

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

<CR> = carriage return character.

<LF> = line feed character.

For example, to disable DST, enter:

F66 Off<CR>

XLi 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><OUTHOUR> <SEP> <OUTWEEK><SEP><OUTDAY><SEP><OUTMONTH><CR>

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where:

<INHOUR> = time to enter DST in 24-hour format.

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

this will be a single space character.

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

<INDAY> = 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).

<OUTDAY> = 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> = carriage return character.

<LF> = line feed character.

For example, enter:

F66 MANUAL 02 2 1 03 02 1 1 11

Meaning:

• Manual settings are in effect.

• The entry time is 02 a.m., week 2 (second), day 1 (Sunday), month 3 (March)

• The exit time is 02 a.m., week 1 (first), day 1 (Sunday), month 11 (November).

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>

XLi 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 XLi 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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F67 – Manual Leap Second Entry

Use Serial/Network Function F67 to manually enable a leap second insertion into the XLi clock time structure. To request the present status of the manual leap seconds settings, send F67<CR> to the

Serial/Network port. The port will respond with the ASCII character string:

F67<SP><LS><SP><SELECT><SP><DATE><CR><LF>

where:

F = ASCII character F.

67 = function number

<SP> = ASCII space character one or more.

<LS> = current leap seconds value in seconds, for GPS Epoch / TAI Epoch

<SELECT> = NONE, ADD or SUB.

<DATE> = Date of next leap second insertion, or blank if <SELECT> is NONE.

<CR> = carriage return character.

<LF> = line feed character.

If the Manual Leap Second function is set with leap second event values, the port will respond with the string described below.

Sample request: F67 <CR>

Response: F67 -14/-33 ADD 12/31/2007 <CR><LF>

To set the current leap second value for UTC / GPS , enter a continuous string of the form:

F67 <SEP>GPSLS<SEP><-nn>

where:

GPSLS= ASCII string indicating a GPS Epoch leap second value will be entered.

<-nn> = Leap second valued entered, -00 to –30.

Sample entry: F67 GPSLS -14<CR>

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Response: OK<CR><LF>

To set the current leap second value for UTC / TAI , enter a continuous string of the form:

F67 <SEP>TAILS<SEP><-nn>

where:

TAILS = ASCII string indicating a TAI Epoch leap second value will be entered.

<-nn> = Leap second valued entered, -19 to –49.

Sample entry: F67 TAILS -33<CR>

Response: OK<CR><LF>

Adding a Leap Second:

To set the next leap second insertion time for adding a leap second, enter a continuous string of the form:

F67 <SEP>ADD<SEP><MONTH><SEP><YEAR>

where:

ADD = ASCII string indicating a leap second will be added.

<MONTH> = Month number that the leap second will be added, on the last day of the

month, MAR, JUN, SEP, DEC or NONE.

<YEAR> = Year that the leap second will be subtracted, 2000 to 2030 or NONE.

Subtracting a leap second:

To set the next leap second insertion time for subtracting a leap second, enter a continuous string of the form:

F67 <SEP>SUB<SEP><MONTH><SEP><YEAR><CR>

where:

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SUB = ASCII string indicating a leap second will be subtracted.

<MONTH> = Month number that the leap second will be subtracted, on the last day of the

month MAR, JUN, SEP, DEC or NONE.

<YEAR> = Year that the leap second will be subtracted, 2001 to 2030 or NONE.

Sample entry: F67 SUB DEC 2007<CR>

Response: OK<CR><LF>

Setting the manual leap second function to no event:

To select no leap second insertion event, enter a continuous string of the form:

F67 <SEP>NONE<CR>

where:

NONE = ASCII string indicating a manual leap second insertion function will be disabled.

The Serial/Network port will respond with the message “ERROR 01 VALUE OUT OF RANGE” if the input string was in the correct format but contained a value, probably numeric, that was out of the range of acceptable values.

The Serial/Network port will respond with the message “ERROR 02 SYNTAX” if it receives a string in an incorrect format, for example the second field should be ADD, SUB or NONE.

The Serial/Network port will respond with the message “ERROR 03 BAD/MISSING FIELD” if the input string lacks a required field.

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F69 – Time Mode

Use function F69 to select the time type displayed by:

• The XLi’s front panel display

• “F8 - Continuous Time Once-per-Second” on page 56

“F9 - Time On Request” on page 58

•

• “F90 – Code Output Configuration” on page 116

Select between the following types of time:

• UTC (Coordinated Universal 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.

Note: A time error can be created when switching to GPS time when the reference is Time Code (non

IRIG 1344). IRIG 1344 resolves this problem.

Related functions:

•

“F1 – Time Zone Offset” on page 48

• “F66 – Daylight Saving Time (DST) Mode” on page 84

• “F8 - Continuous Time Once-per-Second” on page 56

• “F9 - Time On Request” on page 58

Command Line

Local Time modifies UTC time to include the Time Zone and Daylight Saving Time adjustments, if enabled by the user.

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

F69<CR>

The XLi responds using the following format:

F69<SEP><TT><CR><LF>

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