Conclusion
This appendix has presented the basics of SONET/SDH framing and explained how the SONET/SDH technology is being adapted via the use of standard and virtual concatenation to meet the challenging needs of emerging data over SONET/SDH networks in the metro. The emergence of L2 metro services will challenge the legacy SONET/SDH network deployments and will drive the emergence of multiservice provisioning platforms (MSPPs) that will efficiently transport Ethernet, Frame Relay, ATM, and other data services over SONET/SDH.
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