Zte ZXR10 8900E series, Product Description

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ZXR10 8900E series Core Switch Product Description
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Figure 3-13 IEEE 1588 synchronization
ZXR10 8900E supports 1588 v2 protocol and the following working modes:

Ordinary clock: Only one port supports 1588v2 protocol. The clock works as
grandmaster or slave.

Boundary clock: Several ports support 1588v2 protocol. The clock can connect
several ordinary clocks or transparent clock.

Transparent clock: The node does not run 1588v2 protocol, but needs to modify
time stamp. It is required in forwarding time message to fill in the time, when the
node processes the message, in the modification location. Both E2E and P2P
modes are included.
3.6.4 Clock protection
1. Port selection protection
ZXR10 8900E fulfills automatic protection switching of clock link based on SSM protocol
and BMC optimal clock algorithm to reliably transmit the clock. It select an algorithm
according to clock path to calculate the best synchronization path of clock and time
information to avoid clock loop. When a fault occurs to the network, the system makes
the protection switching of clock and time information according to clock path algorithm,
and provide synchronization locking, hold-over and free-run of clock and time
information.
2. Active/standby Main Control Module protection