4/4/2023 0 Comments Mw dwdm sdhSDH was created to replace the PDH system for interoperability between equipment from various vendors. PDH and SDH/SONET are optimized to deal with bulk voice circuits with maximum uptime, minimal delay and guaranteed service continuity. TDM-based networks of PDH (Plesiochronous Digital Hierarchy) and SDH/SONET have long served as standard transport platforms for cellular traffic. The other rates OC-3,OC-12,OC-18,OC-24,OC-36,OC-48,OC-96 and OC-192 are derived from this basic rate. The basic unit of SONET is Optical Carrier level-1(OC-1). The basic unit of SDH is synchronous transmission module level-1(STM-1). Since their emergence from standards bodies around 1990, SDH and its variant SONET (used in North America), have tremendously enhanced the performance of telecommunications networks based on optical fibers. It refers to a group of fiber optic transmission rates that can transport digital signals with different capacities. SONET/SDH is the dominant technology deployed in most metro and long distance networks.
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