92 XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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1
F72 – Fault Status
Use function F72 to display the fault status of the clock.
• Clock PLL
(Phase Locked Loop) – Locked or unlocked
• Clock Status – Locked or unlocked, followed by the clock reference source
• Primary power supply – OK or failed
• Secondary power supply – OK or failed
• Rubidium oscillator, if installed – OK or fault
Command Line
To display the status of the fault detectors, enter:
F72<CR>
The XLi responds:
F72<SP>PLL: <CLK PLL ><S
P> CLK: <CLK STATUS><SP><CLK REF:><SP> PWR1:
<PWR1 STATUS><SP>
PWR2: <PWR2 STATUS><SP>OSC: <OSC STATUS> <CR><LF>
where:
* Please note:
• Clock Status in F72 and F73 function similarly, but use different thresholds to determine whether
the status is LOCKED or UNLOCKED.
- F72 Clock Status uses the F73 Time Threshold value.
- F73 Clock Status uses 150 nS when the reference source is GPS, and 15 uS when the refer-
F = ASCII character F
72 = function number
<SP> = ASCII space character one or more.
<CLK PLL> = Clock PLL (Phase Loop Lock) status, LOCKED or UNLOCKED
<CLK STATUS> = Clock Status, LOCKED or UNLOCKED to the reference source shown. When
the value of the oscillator's predicted worst-case time error ("F13 - Time Error"
on page 51) exceeds the user-configurable value for F73 Time Threshold, F72
CLOCK STATUS becomes UNLOCKED. Otherwise the F72 CLOCK STATUS
remains LOCKED. *
<CLK REF> = Clock reference source GPS PRI, GPS SEC, IRIG A, IRIG B, NASA 36, AUX
REF, HQ/PPS PRI or HQ/PPS SEC.
<PWR1 STATUS> = Primary Power Supply status, OK or FAILED
<PWR2 STATUS> = Secondary Power Supply status, OK or FAILED
<OSC STATUS> = Rubidium oscillator status, OK or FAILED (if installed)
<CR><LF> = output line terminator
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