?– Limited OSS support The strong operational capabilities of SONET forge a
double-edged sword. As discussed previously, these capabilities are so strong and
so entrenched in carriers??™ OSSs that adding new functionality, such as EoS, can be
complex and expensive. Generally more Ethernet functionality means more cost
and complexity. Equipment vendors and service providers must walk a fine line so
that they integrate enough Ethernet functionality to lower network deployment
costs, but not so much that the networks cannot be managed cost-effectively.
Table 11.3 summarizes where EoS and MSPP solutions best fit??”and do not fit??”in
service provider access networks.
Where EoS and MSPPs Best Fit Where EoS and MSPPs Do Not Fit
Carrier Ethernet services are required.
The service bandwidth requires optical access.
The customer location requires a mix of Ethernet and
traditional TDM services.
The Ethernet service requires highly fault-tolerant access.
The access network requires a high degree of operational
integrity.
The SONET access network already exists.
Access networks where none of the ???best fi t???
criteria hold.
Access networks that require a high degree of
Ethernet switching capability.
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