SDH and relationship to 10 Gigabit Ethernet

Another circuit type amongst data networking equipment is 10 Gigabit Ethernet (10GbE). The Gigabit Ethernet Alliance created two 10 Gigabit Ethernet variants: a local area variant (LAN PHY) with a line rate of 10.3125 Gbps, and a wide area variant (WAN PHY) with the same line rate as OC-192/STM-64 (9,953,280 kbps).

The WAN PHY variant encapsulates Ethernet data using a light-weight SDH/SONET frame so as to be compatible at low level with equipment designed to carry SDH/SONET signals, whereas the LAN PHY variant encapsulates Ethernet data using 64B/66B line coding.

However, 10 Gigabit Ethernet does not explicitly provide any interoperability at the bitstream level with other SDH/SONET systems. This differs from WDM system transponders, including both coarse and dense WDM systems (CWDM, DWDM) that currently support OC-192 SONET signals, which can normally support thin-SONET framed 10 Gigabit Ethernet.

September 20, 2011

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