?– The SONET access network already exists. One network typically costs less than two.
When Does This Solution Not Fit?
Clearly these criteria cover a wide range of service provider applications and deployment
scenarios and make EoS-enabled MSPPs an excellent general-purpose solution
for the delivery of Carrier Ethernet services over optical access networks. Still, EoS
does not fit everywhere. Some scenarios where EoS and MSPPs may not provide the
optimal solution include the following:
?– Access networks where none of the above criteria hold The benefits of
EoS show up in many??”but not all??”service provider applications. Some Ethernet
access applications have no TDM component and require little or no redundancy.
Some Ethernet services are ???best-effort??? and don??™t require Carrier Ethernet attributes.
Some low-bandwidth access applications may be best served with other
technologies, such as Ethernet over copper.
?– Access networks that require a high degree of Ethernet switching
capability For reasons discussed previously, most of today??™s MSPP implementations
support Ethernet switching functionality, but typically at lower interface
densities and higher cost points than ???pure??? Ethernet solutions, such as Native
Ethernet or Virtual Private LAN Service (VPLS)??“based solutions.
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