October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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389SDH Architecture and Protection Mechanism
which has to be used by the operator for exchanging the working and protec-
tion capacities.
When NUT has to be used, it has to be properly dened in all the nodes,
such that the working channels, protection channels, and NUT channels are
separately maintained by the system without any intermixing.
Note that the NUT is very different from extra trafc, which is a part of
protection capacity and used only when protection is not in use.
12.10.9 DXC Byte Commands
Although most of the requirement of commands for protection switching is
taken care of by the K1 and K2 bytes, some commands are executed through ...
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