Narrowband Modem
In
telecommunication
, a
narrowband modem
is a
modem
whose modulated
output
signal
has an essential
frequency
spectrum that is limited to that which can be wholly contained within, and faithfully transmitted through, a voice
channel
with a nominal 4 kHz
bandwidth
.
Note:
High frequency
(HF) modems are limited to
operation
over a voice channel with a nominal 3 kHz bandwidth. Source: from
Federal Standard 1037C
and from
MIL-STD-188
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