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Cisco Systems, Inc. has developed the OC-48c/STM-16c DPT line card. DPT rings are dual, counter-rotating fiber rings. Both fibers are concurrently utilized to transport both data and control traffic as depicted in.
Spatial Reuse Protocol (SRP) is the media-independent Media Access Control (MAC)-layer protocol that enables DPT functionality in ring configurations. The SRP MAC provides the base functionality for addressing, packet stripping, bandwidth control, and control message propagation on the packet ring.
DPT rings run on a variety of transport technology, including Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH), wave-division multiplexing (WDM), and dark fiber. DPT provides carriers with the flexibility to operate packet rings over their embedded fiber transport infrastructure as well as an evolution path to packet-optimized transport for high-bandwidth IP networks. An OC-48c/STM-16c DPT node consists of two line cards. The line cards are connected via the MATE interface. Using two inter-connected line cards, the dual working fiber rings will maximize the bandwidth of both rings. Each DPT line card also provides the choice of single mode short- or long-reach optics to meet application requirements.