Xli With A Gps Reference; Xli With Gps And Time Code References; Xli With Two Optional Gps Receivers - Symmetricom XLi User Manual

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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:
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Description
J1 Time Reference
GPS Antenna Cable Delay 60 nS delay
GPS Time Reference
GPS Primary Alarm

XLi with GPS and Time Code References

To configure an XLi with a GPS 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
• Set F74 – Clock Source Control
• Enable the IRIG alarm in
The following table indicates the section to go to for additional information:
Description
J1 Time Reference Change from STANDBY to SECONDARY
Reference Source
IRIG (alarm)

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
GPS Time Reference Bay 1 – PRIMARY
GPS Time Reference Bay 2 – SECONDARY
Reference Source
GPS PRI (alarm)
GPS SEC (alarm)
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Setting
STANDBY
Bay 1 - Primary
Enabled
to "PRI-SEC-SEC".
F73 – Alarm Control /
Setting
Change from PRI to PRI – SEC – SEC
Change from DISABLED to ENABLED
Setting
PRI – SEC – SEC
ENABLED
ENABLED
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Function & Cross Reference
"F110 – J1 Input (Time Code, TIET)" on page 137
"F51 – GPS Antenna Cable Delay" on page 77
"F119 – GPS Receiver Configuration" on
page 154
"F73 – Alarm Control / Status" on page 94
to use a time code input on J1 as a secondary reference
F110 – J1 Input (Time Code,
Status.
Function & Cross Reference
"F110 – J1 Input (Time Code, TIET)" on
page 137
"F74 – Clock Source Control" on page 107
"F73 – Alarm Control / Status" on page 94
Function & Cross Reference
"F119 – GPS Receiver Configuration" on page 154
"F119 – GPS Receiver Configuration" on page 154
"F74 – Clock Source Control" on page 107
"F73 – Alarm Control / Status" on page 94
"F73 – Alarm Control / Status" on page 94
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TIET).
XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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