Wideband modem

In telecommunication, the term wideband modem has the following meanings:

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.
A modem whose bandwidth capability is greater than that of a narrowband modem.

References

This article incorporates public domain material from the General Services Administration document: "Federal Standard 1037C". (in support of MIL-STD-188)

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