May 2014
Beginner
266 pages
11h 32m
English
Content preview from Students' Guide to Information Technology, 2nd Edition
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Communications
Modulated carrier wave
Figure 6.4 Amplitude modulation of
a
digital signal
leaving packets from one signal with those from others. Although
each packet is short, it has
a
broad bandwidth and so carries
a
relatively
large amount of data (see Figure 6.6). At the receiver, the packets are
reassembled to form the original message.
Figure 6.6 compares the use of carrier waves and packets as multi-
plexing methods.
Modems
To transmit digital information from computers over an analogue
communications link such as a telephone line it is necessary to use a
modem. This name is short for
modulator/demodulator,
for the device
modulates th ...
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