What is SDH?(a) sdh is similar standard to SONET developed by ITU-T(b) synchronous digital hierarchy(c) sdh stands for synchronous digital hierarchy and is a similar standard to SONET developed by ITU-T(d) none of the mentionedI got this question in a job interview.Asked question is from SONET topic in chapter Wireless LAN’s, Electronic Mail and File Transfer of Computer Network

What is SDH?(a) sdh is similar standard to SONET developed by ITU-T(b)

1.	What is SDH?(a) sdh is similar standard to SONET developed by ITU-T(b) synchronous digital hierarchy(c) sdh stands for synchronous digital hierarchy and is a similar standard to SONET developed by ITU-T(d) none of the mentionedI got this question in a job interview.Asked question is from SONET topic in chapter Wireless LAN’s, Electronic Mail and File Transfer of Computer Network
Answer» Correct answer is (c) sdh STANDS for SYNCHRONOUS digital hierarchy and is a SIMILAR standard to SONET developed by ITU-T To explain I would say: 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.

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