12.4 ESMC SSM
Overview
Ethernet Synchronization Message Channel (ESMC) Synchronization Status Messages (SSM) are supported by both SDH and
Ethernet networks. SDH is supported by the transport overhead channel and is unidirectional, Ethernet is defined as Organization
Specific Slow Protocol (OSSP).
SSM represents the quality level of the system clocks located in the network. Background (or heartbeat) is sent once per second
as keep alive. (ESMC information PDU) Event message is sent immediately in case the clock quality level has changed. (ESMC
event PDU) Failure condition is declared if no message is received in 5 seconds.
ESMC PDU Format
Event flag: This bit distinguishes the critical time-sensitive behavior of the ESMC event PDU from the ESMC information PDU. A
value of 1 indicates an event PDU and a value of 0 indicates an information PDU.
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