An early form of a modem comprising a device into which a conventional telephone handset can be plugged. The audio tones from the handset can then be encoded for transmission. Alternately, encoded tones can be decoded upon reception.
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An early form of a modem comprising a device into which a conventional telephone handset can be plugged. The audio tones from the handset can then be encoded for transmission. Alternately, encoded tones can be decoded upon reception.