The Service Provider infrastructure is comprised
of fiber connectivity to most but not all of the potential customer buildings.
A Service Provider can simply offer this transparent LAN connectivity between multiple
locations using an Ethernet over Bridging/Switching solution (Chapter 13) in
the metro, basically deployed in its POPs, as shown in Figure 16.3. It may also use an
Ethernet over WDM solution (Chapter 8) to optimize some of its fiber infrastructure,
especially in densely served, high-growth areas.
NOTES The Ethernet over WDM may, alternatively, be integrated into the switching
solution (i.e., the switches themselves may have WDM blades or modules). The
wavelength solution would also work well7 when the Service Provider can only lease a
wavelength from another Service Provider (rather than dark fiber) to reach an off-net
customer (i.e., a customer not physically connected to its network).
An FSO (Chapter 9) solution may also be employed to connect the off-net customers
as well.
Scenario 3
A Service Provider targets offering a nationwide Ethernet WAN service, basically an
Ethernet pipe between any two locations in the country.
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