FibroLAN Falcon Gen-3 M-Class, User Manual

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Falcon M-Class | User Guide
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4.15 IEEE1588 Precision Time Protocol
PTP is an acronym for P recision T ime P rotocol, a network protocol for synchronizing the clocks of
Network systems. Regarding Ethernet Backhaul, PTP is considered the technology of choice to
deliver clock synchronization to remote telecom base stations.
PTP defines synchronization message used between a Master and Slave clock.
The Master provides the time and the slave synchronizes to the Master
Multiple slaves can synchronize to a single Master
The Master clock provides synchronization message that the slaves use to correct their local clocks
This section allows the user to configure and inspect the current PTP Clock settings
In Synchronous mode of operation, the Synchronous Ethernet interface processes the SSM
(
Synchronization Status Messages) and recovers the clock quality level information.
The ESMC channel is a logical communication channel which transmits SSM information that is the
quality level of the transmitting synchronous Ethernet equipment clock
When a Synchronous Ethernet port is selected, the SSM are transmitted through this port,
indicating the quality level of the clock it is able to drive. The messages are received (if the other
remote unit supports SyncE) with the quality level of the transmitting clock.
The remote end unit receiving the messages on its configured Synchronous Ethernet port extracts
the clock quality level and transmits it to the Clock Master Unit.
The Clock Master Unit receives the SSM data from many Synchronous Ethernet ports and
establishes the clock sources. The device internal state logic (clock selector) monitors all reference
clocks and automatically selects the best available reference clock based on configured priority and
revertive priorities.
There are different synchronization methods as described below
The Auto-Revertive is the default mode of operation. This mode includes two functions: automatic
reference clock selection (the highest priority qualified clock is selected) and the occurrence of the
Revertive function when needed.
The clock selection process supports revertive and non-revertive modes of operation.
If the Auto- revertive mode is enabled: when the clock selection process has selected -a primary
clock, and the active primary clock source has failed o degraded over a period of time and then is
later recovered, this primary clock source becomes again the active clock source.
If Auto non-revertive mode is selected and a secondary clock source is active (due to a previous
degradation of the primary clock source), the primary clock source is not reactivated even after its
quality has been improved.
Note:Refer to “
Fibrolan Falcon Products Matrix”2016
” document to find out which Fibrolan
units support this subject