This is due to the fact that current CMTS product offerings,
as well as the DOCSIS MAC layer itself, are optimized for efficient sharing of the
link (particularly the upstream link) by a number of users and would introduce unneeded
overhead and complexity in the case of point-to-point communications. Further, if coexistence
with video services is not required, then the adherence to legacy video spectrum
allocations, channel formats, and coaxial cabling would be an unnecessary limitation.
From the Carrier Ethernet customer??™s perspective, DOCSIS technology might not
currently make sense when data rates approaching or exceeding 1 Gbps are required.
Benefits and Shortcomings
Due to the volume deployment of DOCSIS equipment for residential broadband service,
scale economics have made DOCSIS a very cost-effective solution for delivery of
Ethernet service to a wide variety of customers. The rich quality of service controls and
support for E-Line and E-LAN types of services make it well suited to providing Carrier
Ethernet to business customers.
On the other hand, current DOCSIS equipment cannot achieve upstream data rates
in excess of 38.
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