SolStd17 - CHAPTER 17 SONET/SDH Solutions to Odd-Numbered...

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1 CHAPTER 17 SONET/SDH Solutions to Odd-Numbered Review Questions and Exercises Review Questions 1. The ANSI standard is called SONET and the ITU-T standard is called SDH . The standards are nearly identical. 3. STS multiplexers/demultiplexers mark the beginning points and endpoints of a SONET link. An STS multiplexer multiplexes signals from multiple electrical sources and creates the corresponding optical signal. An STS demultiplexer demultiplexes an optical signal into corresponding electric signals. Add/drop mul- tiplexers allow insertion and extraction of signals in an STS. An add/drop multi- plexer can add an electrical signals into a given path or can remove a desired signal from a path. 5. Pointers are used to show the offset of the SPE in the frame or for justification . SONET uses two pointers show the position of an SPE with respect to an STS. SONET use the third pointer for rate adjustment between SPE and STS. 7. A regenerator takes a received optical signal and regenerates it. The SONET regenerator also replaces some of the existing overhead information with new information.
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This note was uploaded on 09/16/2010 for the course SETAS ETEC301 taught by Professor Multiple during the Winter '09 term at Centennial College.

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SolStd17 - CHAPTER 17 SONET/SDH Solutions to Odd-Numbered...

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