Zte ZXR10 5900E Product Description page 68

ZXR10 5900E Product Description
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Support GPS interface service and provide 1PPS +TOD signal. Realize 1-line GPS
input and 1-line GPS output.
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Support synchronous Ethernet interface service.
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Support the delivery of SSM information. As per SSM information, the clock unit
realizes clock synchronization in the entire network. It supports automatic
high-priority clock selection and avoids the formation of ring on a regular basis.
3.2.33.2 Synchronous Ethernet Clock
ZXR10 5900E is capable of implementing synchronous Ethernet clock in the physical
layer, which goes in line with G.8261.
The synchronous Ethernet extracts the clock via the serial bit traffic in the physical layer,
so that it can realize SDH-similar clock precise. Although it can realize network clock
synchronization at the same time, this method can not realize precise time
synchronization. The precision of the synchronous Ethernet clock which is irrelevant to
the load and packet forwarding latency of Ethernet link layer is guaranteed by the
physical layer.
3.2.33.3 IEEE 1588v2 Clock
ZXR10 5900E supports IEEE 1588 v2 to implement clock and time synchronization.
IEEE 1588v2 is a kind of precise time synchronization protocol, which is PTP in short
form. It is a main/standby synchronization system. In system synchronization process,
main/standby clock releases PTP time synchronization prootocl and time information
regularly. It receives time stamp sent by main clock port. The system reckons out
main/standby line time delay and main/standby difference, and adjust the local time to
make the standby device keeps the same frequency and phase with the main device.
The medium-end switch 5928E and 5928E-FI supports:
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IEEE 1588 v2 L2 and L3 multicast
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IEEE 1588 v2 L3 unicast
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