Symmetricom XLi User manual

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Instra

XLi Time & Frequency System
XLi-man, Issue 8, 6/17/08, Rev. H
XLi Time & Frequency System
User Guide
Issue 8- June 2008
Manual Part Number: XLi-User Manual
CD Part Number: Xli-Man-CD
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

ii XLi Time & Frequency System
XLi-man, Issue 8, 6/17/08, Rev H
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.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

XLi Time & Frequency System iii
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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
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

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

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

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

XLi Time & Frequency System vii
XLi-man, Issue 8, 6/17/2008, Rev. H
2
5
1
SSSSSSSSSSSS SSSSSSSSSS SSSSSSS S SSS S SSSSS S
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
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

viii XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
SSSSSSSSSSSS SSSSSSSSSS SSSSSSS S SSS S SSSSS S
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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
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

XLi Time & Frequency System ix
XLi-man, Issue 8, 6/17/2008, Rev. H
2
5
1
SSSSSSSSSSSS SSSSSSSSSS SSSSSSS S SSS S SSSSS S
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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x XLi Time & Frequency System
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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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XLi Time & Frequency System 1
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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
provides 1x10-12 frequency output accuracy, and better than 30 nS RMS accuracy to UTC (USNO). The
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 distribution in a single unit.
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.
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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2 XLi Time & Frequency System
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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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XLi Time & Frequency System 3
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Clock Architecture
The following figures provide a simplified view of the XLi’s clock architecture.
Figure 1: Functional Timing Block Diagram
Aux Ref - 1/5/10 MHz
Rate Generation
Code Generation
Clock Machine
Phase Compare
200 MHz PLL
10 MHz Osc.
DAC
DAC Select
Clock DPLL
Phase Measurement
16.384 MHz Osc. PLL
1 PPS Timing Select
Time and Clock
Recovery
Code Input
1 PPS Output
Code Output
Rate Output
Aux Ref
1 PPS A
1 PPS B
Code Input
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4 XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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Figure 2: Interface Architecture Block Diagram
Display Keypad Oscillator Rb Power
Display/Keypad Interface
Backplane Interface
Power Supply
AC +5 V, +/- 12 V
Power Supply
DC +5 V, +/- 12 V T&F CPUOption
10 MHz Power, Vc
I/O
Power I/O Power I/O
110/220 AC
9-18 VDC
18-36 VDC
36-72 VDC
User I/O User I/O
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XLi Time & Frequency System 5
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2: System Specifications
Mechanical/Environmental
AC Power Supply
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
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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6 XLi Time & Frequency System
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System Time & Frequency Accuracy
The tables below describe system clock accuracy while locked to the reference source indicated.
GPS Receiver
See GPS Signal Strength Requirements (page 21), and GPS C/A Receiver (87-8028-2) (page 191).
Time Code Input
See “F110 – J1 Input (Time Code, TIET)” on page 137.
1 PPS Output: UTC(USNO) 30 nS RMS, 100 nS peak
Frequency Output Accuracy: <1 x 10-12 @ 1 day
Frequency/Timing, Allan
Deviation, Stability (with
TCXO):
1 x 10-9 @ 1 sec
3 x 10-10 @ 10 sec
3 x 10-10 @ 100 sec
2 x 10-10 @ 1000 sec
1 x 10-12 @ 1 day
AM Code Output Accuracy: 10 μS to the 1 PPS output
DC Level Shift Code Output
Accuracy:
200 nS to the 1 PPS output
Time to System Lock <20 min. typical
1 PPS Output: 10 μS to the incoming code
Frequency Output Accuracy: 1x10-10, referenced to 5x10-11 carrier @ 1 day
Stability of Frequency/Timing –
Allan Deviation: 5x10-9 @ 10 sec, referenced to 3x10-11 @ 10 sec carrier
Accuracy of AM Code Output: 10 μS to the incoming code
Accuracy of DC Level Shift
Code Output:
10 μS to the incoming code
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XLi Time & Frequency System 7
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Have Quick Input
See “HaveQuick/1 PPS Time and Frequency Reference(87-8016-3)” on page 216.
1 PPS Input
See “HaveQuick/1 PPS Time and Frequency Reference(87-8016-3)” on page 216.
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
1 PPS Output: 10 μS to the incoming code
Stability of Frequency/Timing –
Allan Deviation: 5x10-9 @ 10 sec
Accuracy of AM Code Output: 10 μS to the incoming code
Accuracy of DC Level Shift
Code Output:
10 μS to the incoming code
1 PPS Output: 10 μS to the incoming 1 PPS
Stability of Frequency/Timing –
Allan Deviation: 5x10-9 @ 10 sec
Accuracy of AM Code Output: 10 μS to the incoming 1 PPS
Accuracy of DC Level Shift
Code Output:
10 μS to the incoming 1 PPS
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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8 XLi Time & Frequency System
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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.
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.
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
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XLi Time & Frequency System 9
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J1 Input – Time Code or Time Interval - Event Time
Time Code Input Specifications - Modulated (AM) and Demodulated (DC):
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.
See “F110 – J1 Input (Time Code, TIET)” on page 137.
Note: Any stray input capacitance loading will impact TIET measurements
Format: IRIG-B120, B000, B120 1344, B000 1344
IRIG-A130, A000
NASA 36
Amplitude (AM): 0.5 Vp-p to 10 Vp-p, 100 kΩto ground
Ratio (AM): 3:1 ±10%
Amplitude (DC):
Logic Low:
Logic Hi:
< 1.25V and Min. 300mV
> 1.25V and Max 10V
Impedance: 100 kΩ, 50 Ω
Polarity: Positive or negative
Direction: Forward
Quantity: 1
Connector: Female BNC
Related Features Propagation delay 0-99999 μS. Error bypass. (See F110 on page 137)
Pulse Width 100 nS, min.
Active Edge: Rising
Amplitude (DC):
Logic Low:
Logic Hi:
< 1.25V and Min. 300mV
> 1.25V and Max 10V
Impedance: 100 kΩ, 50 Ω
Polarity: Positive
Resolution: 5 nS, Single Shot
Accuracy Refer to “System Time & Frequency Accuracy” on page 6
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