T-GPS User Manual Version 1.2 | 26
Click "Serial Port Configuration"-> "Open Serial Port", click "Advance Time" to enter the
delay compensation value.
The basic compensation unit is 100ns. For example, when the protection cell to be
synchronised, is 500 meters away from the main control building, the "delay compensation
input board" of the extended clock generally needs to compensate 20 units, that is, 2us.
Because the transmission path delay is 290 meters, the delay is 1us, so for 500 meters, the
delay is approximately 1.7us, the output of the multimode optical signal, the input
photoelectric conversion is 70 - 90ns, so the conversion delay is 140 - 180ns, a total
compensation of 1.8 units. However, as the minimum unit is 100ns, it is more appropriate to
compensate 200ns, which is within the claimed accuracy.
