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Narrowband modem

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This is an old revision of this page, as edited by 213.253.40.156 (talk) at 15:51, 25 February 2002 (from Federal Standard 1037C). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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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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