October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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Synchronous Digital Hierarchy
When the PDH hierarchy was developed, it was considered to have enough
capacity, which was then good enough for the requirement of voice and data
trafc. However, as time passed and the demand for the services grew, the
need for higher rates of transmission emerged very fast, largely because of
the boom in data trafc and a steep growth in the consumer base of mobile
telephones. Designing still higher rates in PDH was highly complex and
uneconomical—uneconomical because more stages of multiplexing would
have to be added to achieve a higher data rate, and consequently, a similar
number of stages of ...
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