Specifically, EoS (and the MSPP) best fit in access networks where
?– Carrier Ethernet services must be supported. As the previous section discusses, EoS
technology can play a key role in enabling Carrier Ethernet services, especially
those that require dedicated bandwidth.
?– The service bandwidth requires optical access. Because many Ethernet services
operate at rates up to 1Gbps, optical access is often necessary.
?– The customer location requires a mix of Ethernet and traditional circuit services.
This requires a multi-service access platform. Since SONET is the de facto method
to deliver DS-n and OC-N services over optical access networks, the MSPP is an
ideal tool here.
?– The Ethernet service requires highly fault-tolerant access. The SONET standard
supports ring topologies (i.e., physical diversity) and restoration in less than 60 ms
following a fiber or node failure.
?– The access network requires a high degree of operational integrity. Ethernet OAM
capabilities are emerging (e.g., in standards such as IEEE 802.1ag [12]) and will
SONET/MSPP 311
provide valuable capabilities at the Ethernet layer. Meanwhile, SONET provides a set
of underlying operational capabilities that no other transport technology can rival.
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