October 2007
Intermediate to advanced
368 pages
10h 55m
English
Content preview from Passive Optical Networks
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6.2.5 Single or Multiple Failures
Most of the existing efforts in network protection focus on the scenarios of a
single failure at a time. In most cases, the occurrence of failure in a fiber link or a
piece of network equipment is statistically independent in a network. Moreover,
the mean time between failures is generally much longer than the mean time to
repair a single failure. However, a single failure, such as a fiber cut, may some-
times lead to failure in multiple logical connections. Recently, there are also some
research efforts on studying network protection under multiple failures.
6.2.6 Automatic Protection Switching
Automatic protection switching (APS) can be realized by either centralized or
distributed control. In centralized control, ...
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