LIB-4400/4424 Installation Guide
| MANUAL Page 15 of 65
Synchronous Ethernet (Sync-E)
Recommendation ITU-T G.8262/Y.1362 outlines requirements for timing devices used in
synchronizing network equipment using synchronous Ethernet. This Recommendation defines the
requirements for clocks (e.g., bandwidth, frequency accuracy, pull-in, hold-in, and pull-out ranges,
noise generation, noise tolerance, noise transfer, transient response, holdover performance, etc.).
Synchronous Ethernet (Sync-E) as defined by ITU-T G.8261 allows for the transfer of high-quality
network timing from a traceable reference, to all network elements. Because this is a physical layer
process, the timing quality does not vary due to network load. Sync-E builds on the existing Ethernet
standards and is backward compatible with IEEE 802.3.
IEEE 1588 PTP
IEEE 1588 Precision Time Protocol (PTP) support can be used simultaneously with Sync-E in hybrid
networks.
Note: 1588 PTP is not supported when a port is operating in 1000X or SGMII mode.
Loopback Features
These Loopbacks are available:
Ethernet port loopback - this would be service impacting
Per EVC loopback
Per VLAN loopback
Figure 1: Loopback Types
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