Ceragon FibeAir IP-20 All-Outdoor Series, User Manual

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User Guide for FibeAir® IP-20 All-Outdoor Products, CeraOS 10.5
Page 367 of 825
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9.4 Configuring 1588 Transparent Clock
IP-20 uses 1588v2-compliant Transparent Clock to counter the effects of delay
variation. Transparent Clock measures and adjusts for delay variation, enabling
the IP-20 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 G10.5:
• 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.
Note: Make sure to enable Transparent Clock on the remote side of the link
before enabling it on the local side.
To configure Transparent Clock:
1 Add the port receiving synchronization from the customer side as a Sync
source, with Sync Interface Priority 1. See Adding a Sync Source .
2 Add a radio interface as a Sync source, with lower priority than the port
receiving synchronization from the customer side. See Adding a Sync Source .
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 Adding a Sync
Source .
4 On the remote side of the radio link, if there is an Ethernet port conveying
synchronization, add this port as a Sync source, with lower priority than the
radio interface. See
Adding a Sync Source .
5 Verify that the Sync Interface Quality Status of the first Sync source is not
Failure. See Viewing the Sync Source Status .