Cambium Networks PTP 820 Series User Manual page 595

Chapter 10: Synchronization
Configuring 1588 Boundary Clock
Note
This section is only relevant for PTP 820G. 1588 Boundary Clock for PTP 820F is planned for future
release.
IEEE-1588v2 Boundary Clock enables the PTP 820 to regenerate phase synchronization via standard Ethernet.
Boundary Clock complies with ITU-T Telecom Profile G.8275.1. This enables PTP 820, with Boundary Clock, to meet
the rigorous synchronization requirements of LTE-Advanced (LTE-A) networks.
The Boundary Clock in PTP 820 supports up to four 1588 slave clock devices.
The Boundary Clock terminates the PTP flow it receives on the slave port, recovers the time and phase, and
regenerates the PTP flow on the master ports.
The Boundary Clock node selects the best synchronization source available in the domain and regenerates PTP
towards the slave clocks. This reduces the processing load from grandmaster clocks and increases the scalability of
the synchronization network, while rigorously maintaining timing accuracy.
The PTP 820 Boundary Clock mechanism requires the use of untagged Ethernet multicast PTP packets.
Note
Boundary Clock and Transparent Clock can be used together in the same PTP 820 node.
Note that in System Release 10.0:
•
1588 BC cannot be configured on interface groups, such as LAG and Multi-Carrier ABC.
•
1588 BC can only be used in a chain or star topology. It cannot be used in a ring topology.
•
1588 BC is not supported when Master-Slave communication is using the IPv6 transport layer.
•
1588 BC is not supported with RMC-A
•
1588 BC cannot be used on 1+1 links.
•
1588 BC is not supported with Frame Cut-Through
Enabling Boundary Clock
Note
Before configuring Boundary Clock, you must configure Transparent Clock. See Configuring 1588
Transparent Clock.
To enable Boundary Clock:
1. Select Sync > 1588 > General Configuration. The 1588 – General Configuration page opens.
2. In the 1588 PTP field, select Enable.
3. Click Apply.
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Configuring 1588 Boundary Clock