Table 86: Synchronous Ethernet Standards - Edge-Core ECS4660-28F Management Manual

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| System Management Commands

Synchronous Ethernet

This command enables SyncE on all ports that support SyncE. Use the no

form to disable SyncE on all ports that support SyncE.

Global Configuration

This command enables SyncE on ports 25-28. It does not configure any

of these port to be the clock source.

SyncE must be enabled on a port before the clock selection method can

be set. Selection options include manual

auto-clock-source-selecting), or forced

clock-source-selecting).

SyncE frequency synchronization uses physical layer Ethernet to

distribute timing information. A synchronization chain is formed by

using a stratum 1 traceable source at one end which is then recovered

at downstream PHYs and retransmitted down the chain. Every node in

the chain must be capable of recovering and re-transmitting frequency

synchronization signals.

SyncE provides timing synchronization through the physical layer, while

(Precision Time

can result in processing delays. However, both SyncE and PTP may be

used in combination to achieve a high level of frequency

synchronization with a common defined time.

SyncE delivers a high level of frequency accuracy, but cannot deliver

time-of-day information (i.e., GMT). Conversely, PTP supports time-of-

day information required by billing and service level agreements.

SyncE implementation guidelines are covered by these standards:

Table 86: Synchronous Ethernet Standards

ITU G.8264/Y.1364

Distribution of timing information through packet networks

ITU G.8261/Y.1361

Timing and synchronization aspects in packet networks

ITU G.8262/Y.1362

Timing characteristics of a synchronous Ethernet equipment slave

(synce ethernet

Protocol) uses a higher level packet protocol which

clock-source),

(synce force-

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