7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
Configuration Guide
System Management
Edition: 01 3HE 16132 AAAB TQZZA 269
Network synchronization is commonly distributed in a hierarchical master-slave
topology at the physical layer, as shown in Figure 23.
Figure 23 Conventional Network Timing Architecture (North American Nomenclature)
The architecture shown in Figure 23 provides the following benefits.
• It limits the need for high quality clocks at each network element and only
requires that they reliably replicate input to remain traceable to its reference.
• It uses reliable physical media to provide transport of the timing signal. It does
not consume any bandwidth and requires limited additional processing.
Note: Synchronous Ethernet and IEEE1588v2 PTP are not supported on virtual chassis
(VCs).
OSSG287
ST 2
ST 3 ST 3 ST 3 ST 3 ST 3
ST 2
Primary Reference Clock
Stratum 1
Gateway
Class 1 or 2 CO
ST 4 ST 4 ST 4ST 4 ST 4 ST 4 ST 4
Stratum 2
Class 2 or 3
Central Office
Stratum 3
Class 4 or 5
Toll/End Office
Stratum 4
Customer
Prem
Primary Reference
Secondary Reference
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