108
XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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When a time reference becomes unavailable, the XLi switches to the other time reference, if available.
The configuration of the time reference (e.g., Primary or Secondary) and the settings in
F74 – Clock
Source Control (page 107)
determine if and how switching takes place. If no other time reference is
available, the XLi will use an Aux Ref frequency input on J3 (
“F113 – J3 Input (Aux Ref, Freq Meas)”,
page 146
) as its reference. If references are available, the XLi “freewheels” on its internal oscillator.
Command Line
To display the current settings, enter:
F74<CR>
XLi responds, using the following format:
F74<S><CLK SOURCE><CR><LF>
where:
For example, enter:
F74<CR>
XLi responds (example):
F74 PRI<CR><LF>
To select PRI-SEC-SEC as the new clock source/fail-over pattern, enter:
F74 PRI-SEC-SEC<CR>
XLi responds:
OK<CR><LF >
F
= ASCII character F.
74
= function
number.
<S>
= Space
<CLK SOURCE>
= Clock
Source:
•
PRI
•
SEC
•
PRI-SEC-SEC
•
PRI-SEC-PRI
•
PRI-NSEC-PRI
<CR>
= carriage return character.
<LF>
= line feed character.
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