Wideband modem
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In telecommunication, the term wideband modem has the following meanings:
1. A modem whose modulated output signal can have an essential frequency spectrum that is broader than that which can be wholly contained within, and faithfully transmitted through, a voice channel with a nominal 4 kHz bandwidth.
2. A modem whose bandwidth capability is greater than that of a narrowband modem.
Source: From Federal Standard 1037C and from MIL-STD-188