The MSPP is connected to the service provider
network by optical fiber, which once again limits its deployment. MSPPs are typically
deployed with SONET/SDH ring architectures, as shown in Figure 10.10c. New equipment
build-outs by service providers will use MSPP devices. However, it is expensive to
replace existing SONET/SDH equipment with MSPP devices. If the goal is to provide
Ethernet connectivity, and capacity is available in the existing transport infrastructure,
an overlay network of MSPPs will be very costly compared to using the existing
network to support the service.
Each of the Ethernet connectivity solutions described here may be perfectly acceptable,
or even ideal, for certain applications and deployments. In order for Ethernet
transport to reach its full potential, however, service providers must be able to reach all
customers, whether connected by copper or fiber, with the desired bandwidth. Solving
this problem is the initial focus of a transport solution using circuit bonding.
Transport Solution Using Circuit Bonding
Although several types of Ethernet services have been described, circuit bonding provides
reliable delivery of Ethernet frames across facilities where directly connecting
Ethernet ports is not otherwise possible.
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