A look at the cost per subscriber further illustrates this point. The example network
in Figure 11.11 shows five customer locations, A through E. The example assumes that
each EoS transport interface card, EoS/RPR card, and ?µ-MSPP can support up to four
subscribers (a conservative assumption based on the state of vendor implementations).
The network equipment in Table 11.6 can, therefore, support up to four subscribers
per location, or a total of twenty subscribers. Increasing the number of subscribers per
location requires additional MSPP or ?µ-MSPP Ethernet cards.8
Figure 11.12 shows the cost per subscriber for one, four, and eight subscribers at
each of the five customer locations for each of the three deployment scenarios. This
example reinforces the cost benefit of using EoS to deliver Ethernet services when an
MSPP-based SONET network already exists. It also shows that the per-subscriber cost
of using EoS technology to deliver Ethernet services can be quite low, especially as the
number of subscribers per location grows. At these per-subscriber costs, this solution
delivers high-bandwidth, fully protected Carrier Ethernet services, along with the ability
to deliver traditional DS-n and OC-N circuit services.
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