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o BW required for ASK is equal to the baud
rate of the signal
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o
Because the effective
BW of a
telephone line IS
2400 Hz, the
maximum
baud
rate is also 2400
o Baud rate and bit rate are equal for ASK,
so maximum bit rate is also 2400
bps
Modem
Speed-ASK (Full Duplex)
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|
o For
full duplex TX,
only half of
the total bandwidth
cab be used
in either
directions
o Therefore the maximum speed for ASK in
full duplex mode is 1200 bps
o Noise problem makes it impractical for
use in Modems
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¾ Modem Speed-FSK
o BW required for FSK is equal to the baud
rate of the signal plus the frequency
shift
o So maximum baud rate becomes equal to the
BW transmission medium minus
the
frequency shift
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