Symmetricom XLi User Manual

30 XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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1
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:
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
to “PRI-SEC-SEC”.
• Enable the IRIG alarm in F73 – Alarm Control / Status
.
The following table indicates the section to go to for additional information:
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
J1 Time Reference STANDBY
“F110 – J1 Input (Time Code, TIET)” on page 137
GPS Antenna Cable Delay 60 nS delay
“F51 – GPS Antenna Cable Delay” on page 77
GPS Time Reference Bay 1 - Primary
“F119 – GPS Receiver Configuration” on
page 154
GPS Primary Alarm Enabled
“F73 – Alarm Control / Status” on page 94
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
“F74 – Clock Source Control” on page 107
IRIG (alarm) Change from DISABLED to ENABLED
“F73 – Alarm Control / Status” on page 94
Description Setting Function & Cross Reference
GPS Time Reference Bay 1 – PRIMARY
“F119 – GPS Receiver Configuration” on page 154
GPS Time Reference Bay 2 – SECONDARY
“F119 – GPS Receiver Configuration” on page 154
Reference Source PRI – SEC – SEC
“F74 – Clock Source Control” on page 107
GPS PRI (alarm) ENABLED
“F73 – Alarm Control / Status” on page 94
GPS SEC (alarm) ENABLED
“F73 – Alarm Control / Status” on page 94
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Symmetricom XLi Specifications

General

Brand	Symmetricom
Model	XLi
Category	Measuring Instruments
Language	English