Indeed SONET/SDH is topologically a ring but the configuration requires
creation of individual point-to-point circuits.
The manpower and operational expense required for these activities is difficult to quantify,
although from the foregoing discussion it is logical that they should be lower in RPR
networks. However, CapEx is more straightforward. The following model demonstrates
that equipment expenses as well as OpEx are reduced in the RPR-based ring network.
More Bandwidth
As an illustration let??™s examine a Pay TV service that offers 100 channels over an RPR
ring verses a point-to-point approach. These 100 broadcast channels, in aggregate, will
consume approximately 350 Mbps of bandwidth from the servers to the nodes. Each
customer receives identical feeds simultaneously.
For this illustration let??™s compare a 10 Gbps RPR ring with a point-to-point solution.
Each of the ten 1 Gbps connections is discreet. Therefore, each connects the head end
with only one of the Gig E uplinks from the aggregation equipment either over WDM
or SONET/SDH equipment. This means that the 350 Mbps worth of feeds from the
100 Pay TV channels must be sent on each lambda or connection individually.
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