May 2014
Beginner
266 pages
11h 32m
English
Content preview from Students' Guide to Information Technology, 2nd Edition
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Student's
Guide to Information
Technology
Fibre optics
Digital communications, using laser light pulses travelling along thin
optic fibres, are much more efficient than wire communications, for
they allow a very broad bandwidth. This means that they can carry a
large number of telephone calls simultaneously, as well as video
signals and high-volume computer communications.
So to cope with the ever-increasing volume of data communica-
tions of all types, British Telecom is laying optic fibres across the
country to link exchanges. These are strands of
glass,
about 0.1 mm
thick, with walls able to reflect the laser pulses and so prevent them
escaping ...
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