F120 - n.1 frequency synthesizer, F123 - have quick input/1 pps sync configuration, F123 – have quick input/1 pps sync configuration – Symmetricom XLi IEEE 1588 User Manual
Page 122: Xli responds, F119 b1 c pri

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XLi IEEE 1588 Clock
997-01510-03, Rev. C, 12/12/2006
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where:
For example to make it a primary reference source, enter:
F119 B1 C PRI
XLi responds:
OK
F120 - N.1 Frequency Synthesizer
Note: The N.1 card is currently unavailable as an option for the standard XLi IEEE 1588 clock.
F123 – Have Quick Input/1 PPS Sync Configuration
Note: The HaveQuick/1 PPS Sync card is currently unavailable as an option for the standard XLi IEEE 1588
clock.
F
= ASCII character F.
119
= function
number.
= ASCII
space
character.
B
= ASCII letter to denote Option Bay number follows
= Option Bay Number, 1 through 4.
= one or more separator characters; either space, comma or tab.
C
= ASCII letter denotes reference configuration to follow.
= Reference Source Configuration: PRI, SEC or STBY