Network Synchronization; Figure 9: Conventional Network Timing Architecture (North American Nomenclature) - Alcatel-Lucent 7710 SR Configuration Manual

Network Synchronization

This section describes a synchronization capabilities available on SR and ESS product platforms.
These capabilities involve multiple approaches to network timing; namely Synchronous Ethernet
and a Precision Time Protocol (PTP) IEEE 1588v2. These features address barriers to entry by:
•
•
Network synchronization is commonly distributed in a hierarchical master-slave topology at the
physical layer as shown in
Stratum 1 Stratum 1
Gateway Gateway
Class 1 or 2 CO Class 1 or 2 CO
Stratum 2 Stratum 2
Class 2 or 3 Class 2 or 3
Central Office Central Office
Stratum 3 Stratum 3
Class 4 or 5 Class 4 or 5
Toll/End Office Toll/End Office
Stratum 4 Stratum 4
Customer Prem Customer Prem
Primary Reference Primary Reference
Secondary Reference Secondary Reference

Figure 9: Conventional Network Timing Architecture (North American Nomenclature)

The architecture shown in
•
7710 SR OS Basic System Configuration Guide
Providing synchronization quality required by the mobile space; such as radio operations
and circuit emulation services (CES) transport.
Augmenting and potentially replacing the existing (SONET/SDH) timing infrastructure
and deliver high quality network timing for time sensitive applications in the wireline
space.
Figure
ST 2 ST 2 ST 2 ST 2
ST 3 ST 3 ST 3 ST 3 ST 3 ST 3 ST 3 ST 3
ST 4 ST 4 ST 4 ST 4 ST 4 ST 4 ST 4 ST 4
Figure 9
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.
9.
Primary Reference Clock Primary Reference Clock
ST 3 ST 3 ST 3 ST 3
ST 4 ST 4 ST 4 ST 4 ST 4 ST 4 ST 4 ST 4 ST 4 ST 4 ST 4 ST 4
provides the following benefits:
System Management
ST 2 ST 2 ST 2 ST 2
ST 3 ST 3 ST 3 ST 3 ST 3 ST 3 ST 3 ST 3
ST 4 ST 4 ST 4 ST 4 ST 4 ST 4 ST 4 ST 4
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