October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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Operations and Maintenance in SDH
A very strong set of operations and maintenance features is one of the big-
gest advantages of the SDH over its predecessor technologies, second only to
the huge capacity that it provides.
One of the most beautiful features of the digital technology is the ease of
signaling. If we recall the kind of signaling associated with the analog tech-
nologies, the signaling functions were, by and large, restricted to the call
setup and release, such as detecting the “on hook” and “off hook” conditions,
extending the dial tone, seizure of trunk line, call terminations, etc. Adding
any extra features to si ...
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