METRO EDGE SERVICE INTELLIGENCE

摘要

In traditional networks the access technology dictated what transport technology to use and services offered. Hence T1/E1, DS3/E3 based access technology drove the emergence of synchronous SONET/SDH transport to multiplex and aggregate asynchronous PDH signals. Primary service was voice and then the infrastructure was adapted to support private lines and Frame Relay for data services. Hence the transport of data was overlaid over the existing access and transport network. The data traffic has far outstripped the voice traffic. As the margins from voice services shrink, the service providers have opportunity to offer newer emerging data and other digital services. This means that the services should drive choice of access and transport technologies. The response to this undergoing paradigm shift has resulted in technologies such as RPR, enhancements to SONET/SDH to transport packet based traffic like RPR and Ethernet, definition of Ethernet services and their interoperability, GMPS for network signaling and MPLS for end-to-end multiprotocol and multiservice encapsulation. All this is transforming the metro edge to provide multiple services over same infrastructure. This requires edge equipment to be service intelligent to be able to support multiple services. Service intelligence at the metro edge allows management of conflicting requirements of different services over a common network infrastructure.