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PDH was the first digital hierarchy standard, designed primarily for transporting voice channels. The term "plesiochronous" means "almost synchronous," as network elements operate at nearly the same clock frequency but are not perfectly aligned.

Digital multiplexing systems are the backbone of telecommunications, used to combine multiple low-speed data streams into a single high-speed link. The transition from to Synchronous Digital Hierarchy (SDH) represented a major evolution in network efficiency and standardization. Plesiochronous Digital Hierarchy (PDH) PDH was the first digital hierarchy standard, designed

: Lacks built-in facilities for automatic management and routing. Synchronous Digital Hierarchy (SDH) SDH vs PDH | Difference between PDH and SDH - Baudcom PDH was the first digital hierarchy standard, designed