October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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294 Principles of Synchronous Digital Hierarchy
interpreted and stored. The average frequency of the incoming clock is com-
pared with that of the local clock. If both the clocks have the same average
frequency, no change in the pointer value is carried out. However, if there is
a difference in the clock frequencies of the recovered clock with respect to
the local clock, the pointer value is changed. The new pointer is then inserted
into the VC-4, SOH is added, and the STM-1 is retransmitted, all using local
clock. The pointer adjustment procedure and the role of H1, H2, and H3
bytes are as follows.
The H3 bytes generally contain
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