Р¦рёс„сђрѕрірё Рјсѓр»с‚рёрїр»рµрєсѓрѕрё Сѓрёсѓс‚рµрјрё -pdh,sdh.rar [ Windows ]

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.

: To extract a single low-speed signal (like a 2 Mbps E1 line) from a high-speed stream (like a 140 Mbps E4 line), the entire stream must be fully demultiplexed. PDH was the first digital hierarchy standard, designed

: Uses bit-by-bit interleaving . To account for slight timing differences, it employs "bit stuffing," where extra bits are added to align signals. it employs "bit stuffing