October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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Plesiochronous Digital Hierarchy
We have seen the methods of construction of digital signals from an analog
voice signal and the principles of time division multiplexing in the previous
chapters. Let us now have a look at the process through which these sig-
nals are actually used in the practical communication systems to enable the
media to carry a large number of channels.
The 64-kbps digital signal is never used as it is for the communication link,
for the simple reason that it is too costly to use two pairs of copper wires over
long distances for only one channel. Thus, a large number of 64-kbps signals
are multiplexed into one physical ...
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