October 2018
Intermediate to advanced
555 pages
17h 33m
English
Content preview from Principles of Synchronous Digital Hierarchy
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Data Over SDH
The telecommunication started with voice or speech of one person reaching
another person at a distance that was beyond the range of the direct sound.
The point-to-point local telephone was invented by Alexander Graham
Bell in 1876. The need to talk to more people gave birth to manual tele-
phone exchange, and subsequently, to automatic telephone exchanges, and
our need to talk tothe people in other cities gave birth to the long-distance
communication.
Long-distance communication technologies have since made a long
journey, from carrier communication of a few channels to the enor-
mous c
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