Telecom Dictionary - Definitions of terms
Narrowband Modem - Definition and Use
Narrowband Modem - 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.
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