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FSK MODEMs use variation in what parameter to represent data?

William Cain

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Brandon Scott on September 2, 2019

Frequency . FSK means Frequency Shift keying. FSK Modems use 4 frequencies at the lower end of the audio range: . 1070 Hz (Space - originating MODEM) . 1270 Hz (Mark of originating MODEM) . 2025 Hz (Space - MODEM response) . 2225 Hz (Mark - MODEM response) These frequencies were selected by AT&T to all fit in the 3000Hz bandwidth of a standard long distance voice telephone line andallow both sides to send data at the same time, withoutinterfering with each other.


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