Because these
typically are high capacity, high functionality, and high dollar networks, survivability
is essential. For these reasons, dedicated SONET networks with Ethernet capabilities
provide a large and profitable business for many service providers. Examples include
AT&T Ultravailable Managed OptEring Service and Verizon??™s Enhanced Dedicated
SONET Ring (EDSR).
With dedicated networks, the network is the service. The network elements??”most
often MSPPs??”must provide not only EoS transport, but also all the attributes of
MEF-compliant E-LAN and E-Line services (as well as traditional DS-n private line
services). For this reason, MSPPs in dedicated networks must often support a rich
set of Ethernet functions, including Ethernet switching. Resilient packet ring (RPR)
functions enable Ethernet bridging over SONET rings and often fit well in this application.
The relative complexity of the Ethernet capabilities means that traditional
transport OSSs often cannot manage all the functions of dedicated EoS networks.
This places a higher burden on service providers??™ abilities to integrate these networks
into new OSSs and on vendors??™ abilities to develop capable element management
systems (EMSs).
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