The second reason is the emergence of Carrier
Ethernet, as described in Chapter 1. Service providers wishing to deliver Carrier
Ethernet services require equipment that can support five key attributes: standardized
services, scalability, reliability, quality of service (QoS), and service management.
This has renewed interest in EoS solutions.
In any Carrier Ethernet equipment solution, Ethernet functionality plays the most
critical role. Each of the five Carrier Ethernet attributes depends mainly on what the
network equipment does with the Ethernet frames??”how it forwards them (especially
during periods of network congestion or failure), monitors them, reports them, and associates
them with end user services.
However, the underlying transport technology can also play an important role in the delivery
of Carrier Ethernet services. SONET technology features some fundamental characteristics
that enhance the ability of EoS solutions to support some of the Carrier Ethernet
attributes. Specifically, EoS solutions are particularly strong in the following areas:
?– Reliability Reliability lies at the heart of SONET technology. SONET protection
schemes??”and all the operations and management capabilities required to support
them??”provide failure detection and reporting within 10 ms and restoration within
50 ms.
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