Therefore,
the bandwidth consumed by Pay TV is 350 Mbps ?— 10 connections or 3.5 Gbps out of the
362 Chapter 12
total 10 Gbps available. Each 1 Gbps connection feeding the Gig uplinks will receive
its??™ own individual broadcast TV signal even though it is identical to the broadcast TV
signals simultaneously going to the remaining 9 connections.
The RPR solution is quite different. Since all signals are aggregated and multiplexed
in the RPR device the use of multicasting protocols make more efficient use of the ring
bandwidth. Since the Pay TV signals are identical we only need to send them around
the ring once. Then each node can replicate them out each 1 Gig port to the aggregation
equipment.
With RPR the portion of ring bandwidth used for this service is 350 Mbps or 1/10 of
that required for point-to-point solutions. As Table 12.4 shows this frees an additional
3.15 Gbps of ring bandwidth.
Lower Capex
RPR architecture consolidates network elements resulting in significantly lower
CapEx. Due to the reduction of network elements OpEx is reduced as well. The use of
RPR traffic management and MPLS control plane means fewer network elements in
the metro network.
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