November 2007
Intermediate to advanced
736 pages
46h 32m
English
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WHY DIGITAL?
What are the advantages of transmitting the telephone voice in digital form? One of the major advantages existed on early teletype links, but when several teletype channels were multiplexed into one voice circuit, the advantage was lost. Now the changing economies are bringing it back. With analog transmission, whenever the signal is amplified, the noise is amplified alongwith it. As the signal passes through its many amplifying stations, the noise is cumulative. With digital transmission, however, each repeater station regenerates the pulses. New, clean pulses are reconstructed and sent on to the next repeater, where yet another cleaning-up process takes place. So the pulse train can travel through a dispersive noisy medium but, ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.