October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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357Operations and Maintenance in SDH
39. What is “automatic protection switching?” Which are the bytes re -
served for this application?
40. What is SSM? How is it worked?
41. What is the role of media-dependent bytes and bytes reserved for
national use?
42. What is “embedded control channel?” How is it implemented and
what purpose does it serve?
43. What is the role of NMS in SDH? Which bytes provide a channel for
NMS at regenerator and multiples levels?
44. Draw a schematic diagram of hierarchical NMS as suggested by ITU-T.
45. Discuss in brief the features of “distributed control,” “distributed
authorization,” and “customer manag ...
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