F52 - distribution cable delay, F52 – distribution cable delay, Command line – Symmetricom XLi IEEE 1588 User Manual
Page 65: Xli responds, The xli responds using the following format, F51<s>b<n><s><delay>ns<cr, Ok<cr><lf, F52<cr, F52<sep><sign><delay>ns<cr><lf
XLi IEEE 1588 Clock
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To set the antenna cable delay for an option card, use the following format:
F51<S>B<N><S><DELAY>NS<CR>
For example, to set the antenna cable delay for the GPS card in option bay 4 to 100 ns, enter:
F51 B4 100NS<CR>
XLi responds:
OK<CR><LF>
F52 – Distribution Cable Delay
Use function F52 to display or set the distribution cable delay for the time code and 1 PPS outputs. F52
compensates for the signal’s travel time from the XLi to its point of use. The distribution cable delay
applies uniformly to all output ports. The as-shipped factory setting is +0 ns. The range of possible
values is +999,999 ns to –999,999 ns. Positive values advance the timing signals, while negative values
retard them.
To calculate what the setting should be, multiply the delay/foot by the length of the cable in feet. The
typical delays for the following cable types are:
•
RG-58 – approximately 1.4 ns/foot
•
RG-59 – approximately 1.24 ns/foot
Command Line
To display the current distribution cable delay, enter:
F52<CR>
The XLi responds using the following format:
F52<SEP><SIGN><DELAY>ns<CR><LF>