October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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SDH Architecture and Protection Mechanism
One of the main advantages of SDH/SONET over PDH is the “resilience”
provided in the SDH networks, besides the direct drop/insert facility and
enhanced OAM features. Resilience means that the networks are tolerant
to faults, and the customer trafc is not affected by system breakdowns.
Although it is never possible to provide a 100% fault tolerant design for
any type of network, SDH provides for fault tolerance to a great extent.
The electronics of today are by and large very reliable, thanks to the large-
scale integrated circuits and much improved manufacturing facilities,
with much harder spe
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