Customer access is Ethernet,
ranging from 10M to 10G over fiber. Customer locations are usually densely clustered.
The Service Provider owns fiber to most customer locations (but not all) and also the
WAN infrastructure, which is largely comprised of SONET rings.
Here, a Service Provider may consider an Ethernet over WDM (Chapter 8) in the access,
basically to extend and aggregate customers over the same fiber infrastructure,
and then employ Ethernet over SONET (Chapter 11) rings in the MAN/WAN to handoff
the Ethernet stream to the Ethernet over WDM solution on the far end to ultimately
deliver the service. A Service Provider has, of course, other options and may (or may
not) use WDM in the access, but rather use some form of switching and then handoff
to a WDM -based core (instead of SONET). Naturally, these decisions are influenced by
other competitive and economic factors.
If Scenario 3 was augmented to provide an any-to-any connection (i.e., the Ethernet
streams could be sent to different destinations at different times), then an MPLS solution
(Chapter 14) would be very feasible.
7 Assuming that the wavelength scheme is common, i.
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