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Glossary
NetBlazer
385
SyncE
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 (PRC/PRS) 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.
Содержание FTB-860
Страница 1: ...User Guide FTB 860 880 NetBlazer Series for FTB 1 Ethernet Packet Sync FC Wireless Test Applications...
Страница 7: ...NetBlazer vii B Glossary 371 Acronym List 371 VLAN 379 1588 PTP 380 SyncE 385...
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Страница 382: ...Specifications 370 FTB 860 880 Straight Through Cable 1000 Mbit s Crossover Cable 1000 Mbit s...
Страница 390: ...Glossary 378 FTB 860 880 Acronym List W WAN Wide Area Network WIS WAN Interface Sublayer WWN World Wide Name...