Symmetricom XLi IEEE 1588 User Manual page 64

S S S S S S S S S
59 GPS antenna cable supplied with the XLi. If the GPS antenna is connected using a different antenna
length, calculate the new value using the multiple given below and adjust the value of F51. If using an
optional Down/Up Converter, consult that product's documentation for directions on setting the correct
cable delay.
F51 Guidelines:
• For RG-59: multiply the cable length by 1.24 ns/ft. to get the value for F51.
• For RG-58: multiply the cable length by 1.4 ns/ft. to get the value for F51.
• Don't use function F51 to adjust the XLi's timing outputs; use F52 Distribution Cable Delay
instead.
Command Line
Use the following format to display the current Antenna Cable Delay setting:
F51<S>B<N><CR>
The XLi responds using the following format:
F51<S>B<N><SEP><SIGN><DELAY>ns<CR><LF>
where:
= ASCII character F (f or F for input string).
F
= the function number.
51
= ASCII space character one or more.
<S>
= ASCII letter to denote Option Bay number follows
B
= Option Bay Number of the GPS option card, 1 through 4.
<N>
= carriage return character.
<CR>
= one or more space characters.
<SEP>
= either + or blank
<SIGN>
<DELAY> = 1 to 6 digit delay from 0 ns to 999999 ns.
= nanoseconds (ns or NS for input string).
ns
= line feed character.
<LF>
For example, to see the antenna cable delay for the GPS card in option bay 4, enter:
F51 B4<CR>
XLi responds:
F51 B4 +000060ns<CR><LF>
56
S S S S S S S S S S S S S S S S S S S S S S S S S S S
XLi IEEE 1588 Clock
997-01510-03, Rev. C, 12/12/2006
S S S S