: Regional differences (E-carrier vs. T-carrier) make it difficult to interconnect systems from different countries or vendors.
: Operates on two primary regional standards: the European E-carrier (30 channels) and the North American/Japanese T-carrier (24 channels). Limitations : : Regional differences (E-carrier vs
: 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
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) : Regional differences (E-carrier vs