Circuit bonding is created by using the current
GFP/VC/LCAS standards.
Even if a building has fiber access, Multi-Service Access (MSA) platforms are not optimal
for providing Ethernet transport. A fundamental issue related to MSAs is that
these platforms are either TDM- or IP-centric. A TDM-centric MSA strands bandwidth
when transporting IP since this type of MSA must use static multiplexing based on
SONET STS boundaries. Because the IP-centric MSA generally does not have the resiliency
of SONET to transport TDM traffic, optimal transparent transport of Ethernet
services has not been fully realized. In most circumstances, bandwidth and transparency
are traded off for the proper connectivity.
Traditional Ethernet access solutions use transport bandwidth inefficiently; therefore,
the following issues need to be addressed when providing Ethernet transport services
in the access network:
?– Transparent transport of FE/GbE over available copper/SONET infrastructure.
?– Efficient concatenation of available bandwidth.
268 Chapter 10
?– Solutions must be payload agnostic??”independent of data/ TDM client formats.
?– Solutions must be independent of fiber availability.
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