SDH - Synchronous Digital Hierarchy (Part 2) Compensation of frequency synchronization error The pointer can not only fulfill a fixed phase shift and mismatch clock multiplexer clocked device, from which the user data is receiv…

SDH - Synchronous Digital Hierarchy (Part 1) Specific technologies PDH deficiencies have been addressed and overcome technology developers synchronous optical networks (Synchronous Optical NET, SONET), the first version of the standard whi…

PDH - plesiochronous digital hierarchy PDH technology was developed in the late 60s by AT & T to address the problem of large communication switches, telephone networks among themselves. Communication links the FDM, applied previ…