fax switch

fax switch

A device that tests a phone line for a fax signal and routes the call to the fax machine. When a fax machine dials a number and the line answers, it emits an 1100Hz signal (CNG tone) to identify itself. Some devices handle voice, fax and data modem switching and may require keying in an extension number to switch to the modem. See CNG tone.
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inventor and patent holder of the original fax switch, has released the ASAP TF 555 switch, which is capable of automatically transferring an incoming call to the phone, a fax, an answering machine, or a computer.
If the capability is not built into the machine, it's possible to obtain a separate device, called an autoswitch or FAX switch, which can route each incoming call to the intended answering device.