Cambium Networks PTP 820 Series, User Manual

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Chapter 22: Synchronization (CLI) Configuring 1588 Transparent Clock (CLI)
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Configuring 1588 Transparent Clock (CLI)
Note
This section is only relevant for PTP 820G. 1588 Transparent Clock for PTP 820F is planned for future
release.
PTP 820G uses 1588v2-compliant Transparent Clock to counter the effects of delay variation. Transparent Clock
measures and adjusts for delay variation, enabling the PTP 820G to guarantee ultra-low PDV.
A Transparent Clock node resides between a master and a slave node, and updates the timestamps of PTP packets
passing from the master to the slave to compensate for delay, enabling the terminating clock in the slave node to
remove the delay accrued in the Transparent Clock node. The Transparent Clock node is itself neither a master nor
a slave node, but rather, serves as a bridge between master and slave nodes.
Note that in release 10.0:
•
1588 TC is not supported when Master-Slave communication is using the IPv6 transport layer.
•
1588 TC cannot be used on 1+1 HSB links.
•
1588 TC is not supported with Frame Cut-Through.
•
1588 TC is supported with IPv4 UDP encapsulation only.
•
Multicast PTP packets are only supported with Point-to-Point services. Unicast PTP packets are supported with
both Point-to-Point and Multipoint services.
Before configuring Transparent Clock:
1. Add the port receiving synchronization from the customer side as a Sync source with Sync Interface
Priority 1. See
Configuring an Ethernet Interface as a Synchronization Source (CLI) .
2. Add a radio interface as a second Sync source with lower priority than the port receiving synchronization
from the customer side. See
Configuring a Radio Interface as a Synchronization Source (CLI) .
3. On the remote side of the radio link, add the radio interface facing the local device as a Sync source, with
Sync Interface Priority 1. See
Configuring a Radio Interface as a Synchronization Source (CLI) .
4. Add the port receiving synchronization from the customer side as a Sync source, with Sync Interface
Priority 1. See
Configuring a Radio Interface as a Synchronization Source (CLI) .
5. Verify that the Sync Interface Quality Status of the first Sync source is not Failure. See Displaying
Synchronization Status and Parameters (CLI) .
Note
Make sure to enable Transparent Clock on the remote side of the link before enabling it on the local
side.
To enable Transparent Clock, enter the following command in root view to enable:
root> platform sync ptp-tc set admin enable
To disable Transparent Clock, enter the following command in root view :
root> platform sync ptp-tc set admin disable