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XLi IEEE 1588 Clock 105
997-01510-03, Rev. C, 12/12/2006
2
5
1
SSSSSSSSSSSS SSSSSSSSSS SSSSSSS S SSS S SSSSS S
When the XLi reacquires a time reference source and is steering its own internal oscillator, it stops using
Aux Ref as its frequency reference.
For Aux Ref to work:
• The Aux Ref frequency source must be connected to the J3 input.
• F113 Input Configuration must be set to Aux Ref
• F113 Input Frequency must be set to the correct frequency
• F113 Input Impedance must be set to the correct impedance
Command Line
To display the J3 Input Configuration, enter:
F113<CR>
The XLi responds using the following formats:
F113<S>DISABLE<CR><LF>
Or:
F113<S>AUX REF<S><FREQ><S><IMP><CR><LF>
Where the F113 entry and request formats are defined as:
For example, enter:
F113<CR>
The XLi displays the current configuration (example):
F = ASCII character F.
113 = function number.
SHOW = ASCII character string “SHOW” for displaying frequency measurements.
DISABLE = ASCII character string “DISABLE” to disable J3 as input port
AUX REF = ASCII character string “AUX REF” to set J3 to take auxiliary reference input
<S> = ASCII space character one or more.
<FREQ> = AUX REF Input Frequency: 1MHZ, 5MHZ, 10MHZ
<IMP> = Input Impedance: 1K or 50
<INT> = Frequency Measurement Interval. This is the gate time of the measurement. Range: [000001,
999999] in seconds.
<CR><LF> = line terminator, either a carriage return and line feed for output strings or a carriage return only for
input strings.