System Management
258
Basic System Configuration Guide
3HE 11010 AAAC TQZZA Edition: 01
Synchronous Ethernet works at Layer 1 and is concerned only with the precision of
the timing of signal transitions to relay and recover accurate frequencies. It is not
impacted by traffic load and is therefore not affected by packet loss or PDV that
occurs with timing methods that use higher layers of the networking technology.
Synchronous Ethernet is automatically enabled on ports and SFPs that support
synchronous Ethernet. The operator can select an Ethernet SFP port as a candidate
timing reference. The recovered timing from this port is distributed to the nodes in the
network over the physical layer of the Ethernet link. This allows the operator to
ensure that any of the system outputs are locked to a stable, traceable frequency
source. The transmit timing of all SFP ports with SFPs that support synchronous
Ethernet is then derived from the node’s SSU.
Synchronous Ethernet can only be used for end-to-end network synchronization
when all intermediate switching nodes in the network have hardware and software
support for synchronous Ethernet.
Synchronous Ethernet is supported on the following cards and platforms:
• 8-port Ethernet Adapter card (ports 7 and 8), version 2
• 6-port Ethernet 10Gbps Adapter card
• 8-port Gigabit Ethernet Adapter card
• 2-port 10GigE (Ethernet) Adapter card
• 2-port 10GigE (Ethernet) module
• 10-port 1GigE/1-port 10GigE X-Adapter card
• Packet Microwave Adapter card
• 6-port SAR-M Ethernet module
• 7705 SAR-M (all variants) (on all Ethernet ports)
• 7705 SAR-Hc (on all Ethernet ports)
• 7705 SAR-W (on all Ethernet ports)
• 7705 SAR-Wx (all variants) (on all Ethernet ports)
• 7705 SAR-H (on all Ethernet ports)
• 4-port SAR-H Fast Ethernet module
• 7705 SAR-A (both variants) (supported on the XOR ports (1 to 4), configured as
either RJ-45 ports or SFP ports, and on SFP ports 5 to 8. Ports 9 to 12 do not
support synchronous Ethernet.)
• 7705 SAR-Ax (on all Ethernet ports)
• 7705 SAR-X (on all Ethernet ports)
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