This simple solution could be employed in a book-ended
fashion, as depicted in Figure 16.3, and handoff an Ethernet connection to the router
at the POP.
NOTES If the target customers are served through (physically) different POPs and
the single gateway router/switch (Chapter 13) resides at another POP (i.e., it is not
the serving POP), as shown in Figure 16.3 for customers of POP 2, then a switching/
routing solution may be necessary to interconnect the different POPs. Furthermore,
these switches/routers can be interconnected over a SONET and/or WDM infrastructure
as well (Chapters 11 and 8, respectively), or alternatively, employ a wireless
meshed FSO solution (Chapter 9).
If the Service Provider is a Cable/MSO with an HFC infrastructure, then it could
use this as an access to a central (head-end) location where the gateway router/switch
would usually be located. If it has a fiber infrastructure, it could also use a PON
(Chapter 7) solution. If the Service Provider has a Copper access infrastructure,
it could also employ Ethernet over First Mile (EFM) Copper (Chapter 5) solution in
the access.
Figure 16.3 A typical scenario offering Carrier Ethernet services
Bonded T-1s/E-1s
Bonded T-1s/E-1s
POP 3
POP 2
SONET/
WDM
Gateway
Router/Switch
Ethernet handoff
Ethernet handoff
POP 1
Service provider network
Internet
Evolution of Carrier Ethernet Solutions 515
Scenario 2
A Service Provider wishes to offer an any-to-any connectivity between 10 and 100M
to its business customers; typically, these customers each have multiple locations in a
metro area and want their LANs to be interconnected at these locations, creating in essence
a larger LAN across the metro.
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