Future Transport Network Architectures
نویسندگان
چکیده
The architecture of today's long distance transmission networks, which we call the baseline architecture, is a complex and multi-layered hierarchy of Time-Division Multiplexing (TDM) circuits. One premise of the baseline architecture is that restoration from network failures is provided mostly by SONET/SDH rings. This paper presents an alternative architecture that uses ATM and Optical Layer Cross-connect (OLXC) technology for TDM services. Using a sophisticated set of network design tools developed at AT&T Labs-Research, we show that the alternative architecture offers dramatic capital savings and improved network efficiency over the baseline architecture. Most of this savings can be attributed to use of OLXC mesh-network restoration, which makes more efficient use of capacity than SONET/SDH rings, and use of ATM switching for transport of TDM circuits, which consolidates the numerous TDM equipment layers inherent to the baseline architecture. In addition, motivated by the rapid growth of IP services, we analyze in the alternative architecture whether to provide restoration for IP services in the IP layer itself, by rerouting packets over pre-calculated restoration paths with Multi-Protocol Labeled Switching (MPLS), or to alternatively provide restoration of failed IP layer links in the OLXC layer. One potential advantage of IP layer restoration is that network operators may choose to only restore a fraction of the services, in particular the “priority” services, affected by a network failure. This paper gives some methodology of how to determine this fraction at which IP layer restoration is cost-competitive with OLXC restoration.
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تاریخ انتشار 1999