Symmetricom XLi IEEE 1588 manual F51SBNCR, F51SBNSEPSIGNDELAYnsCRLF, Delay, F51 B4CR

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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:

F= ASCII character F (f or F for input string).

51= the function number.

<S> = ASCII space character one or more.

B= ASCII letter to denote Option Bay number follows

<N>	= Option Bay Number of the GPS option card, 1 through 4.
<CR>	=	carriage return character.
<SEP>	= one or more space characters.
<SIGN>	= either + or blank
<DELAY>	= 1 to 6 digit delay from 0 ns to 999999 ns.
ns	= nanoseconds (ns or NS for input string).
<LF>	=	line feed character.

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 XLi IEEE 1588 Clock

997-01510-03, Rev. C, 12/12/2006