What is SDH?

A) Synchronous Digital Hierarchy

B) SDH is Similar Standard to SONET Developed by ITU-T

C) SDH stands for Synchronous Digital Hierarchy and is a similar standard to SONET developed by ITU-T

D) None of the above

Correct Answer : sdh stands for synchronous digital hierarchy and is a similar standard to SONET developed by ITU-T

Explanation : SDH is a standard that allows low bit rates to be combined into high-rate data streams and as it is synchronous, each individual bit stream can be embedded into and extracted from high-rate data streams easily.