Exfo FTB-800 Series for FTB-1 Manual de usuario descargar pdf (Pagina 582)

100

101

Glossary

572 FTB-700G/800 Series

SyncE

Synchronous Ethernet or SyncE enables a traceable network timing

reference frequency to be distributed node-by-node across a chain of

Ethernet devices (SyncE compliant devices only). The network timing

reference is typically hierarchically traceable to a Primary Reference

Source/Clock (PRS/PRC) in a unidirectional flow. Any node in the chain not

compliant to SyncE automatically terminates the synchronization

propagation but this does not impact the flow of traffic.

The Physical Layer carries the clock frequency and the Data Link layer

carries the Quality Level (QL) associated to the transported frequency via

Synchronization Status Messaging (SSM) embedded in the Ethernet

Synchronization Message Channel (ESMC). The QL is transported via

Information and Event PDUs typically transmitted at a rate of 1 frame per

second but this rate can vary between 1 to 10 messages per second to

respect the slow protocol rules. The Information PDU is used as heart-beat

for the channel while one Event PDU is transmitted asynchronously to the

Information PDU upon change of the QL value. Following this change, the

Information PDU is also adjusted to match the new QL.

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Exfo FTB-800 Series for FTB-1 Manual de usuario Pagina 582

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