Справочник Пользователя для Symmetricom XLi IEEE 1588
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.
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:
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>