Synchronous Ethernet (Synce); Overview - FibroLAN Falcon-RX/812/G/A User Manual

Falcon R-Class | User Guide

4.13 Synchronous Ethernet (SyncE)

Overview

This section allows the user to inspect and configure the current SyncE port settings. SyncE is used
to make an Ethernet network 'clock frequency' synchronized. Mobile network operators have started
to deploy 4G/LTE networks. Ethernet has become the logical choice for mobile backhaul. These
operators would like to deploy voice over Ethernet. Ethernet networks must provide timing and
synchronization to enable proper operation of the mobile services. The Falcon-RX devices are
offered with complete precision timing support based on Synchronous Ethernet and 1588-2008 (PTP)
for LTE mobile backhaul applications.
The aim of Synchronous Ethernet is to provide a synchronous signal to network resources that may
need such frequency synchronization signal. SyncE was standardized by the ITU-T and supports the
following recommendations:
ITU-T G8261 standard that defines aspects regarding the architecture and performance of SyncE
networks.
ITU-T G8262 standard which specifies SyncE slave clocks.
ITU-T G8264 standard that describes the specifications of Ethernet Synchronization Messaging
Channel (ESMC)
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 can 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.
176