T-GPS User Manual Version 1.2 | 24
4.19
PTP Signal Output Module
Each PTP output can provide up to four PTP optical signals. Each
signal requires two physical interfaces, one transmitting (TX) and
one receiving (RX). The output interface is a multi-mode ST
interface with a maximum transmission distance of 2Km. The
PTP output signal can be connected directly to the PTP client or
through a dedicated PTP switch.
The PTP output board complies with the content requirements
of IEEE1588 v2, the message format is IEEE802.3, and the delay
measurement mechanism is peer to peer mode. The timing
accuracy can reach 1μs, and the time jitter is ≤200ns.
4.20
Delay Compensation Module
This function requires two modules (input and output) and is
used where there is a large distance (>300m) between the main
clock and subsidiary clocks. Due to the length of the
transmission path, a delay occurs, such that the 1µs accuracy
cannot be guaranteed. Using the Delay Compensation modules
allows this accuracy to be maintained. Additionally, it can be
used to directly synchronise equipment located a long distance
from the clock.
Each delay compensation input module provides an input for
one IRIG-B optical signal and gives a compensation range of -
400ms to + 200ms. It uses an ST port pigtail interface.
The IRIG-B light flashes following the input of an IRIG-B signal, it has a blinking frequency of
100Hz / s.
The RUN lamp indicates whether the input IRIG-B optical signal is operating normally, in
which case it starts blinking at a frequency of 1Hz/s
