Dial Tone Generator Device

Quad band gsm fwt with usa dial tone and 3g networks support.

Dial tone generator device.

Compatible with fax machines and modem speeds up to 28 8 kbps precise dial tone switch selectable ring cadence provides cpc breaks after hang up on either port switch selectable audio attenuation can provide 2 seconds of precise dial tone before ringdown provides ringback signal to calling device one or two way ringdown capability. Just put your gsm sim card in and connect to any type of regular land line phone device at your own choice at your home or office. Electronic audio acoustics and equipment testing and setup or informational signals commonly associated with a telephone system in each case electrically generated audio pulses are sent to specific components. This circuit uses inexpensive common components to generate a precise dial tone for phone applications see the figure u1 an intel 82c54 timercounter generates 350 and 440 hz square waves.

It indicates that the exchange is working and is ready to initiate a telephone call the tone stops when the first dialed digit is recognized. If no digits are forthcoming the partial dial procedure is invoked. In the case of audio equipment testing frequency response and sound evaluation are. A tone generator also known as a signal generator can be described in at least two contexts.

Those systems usually send dial tone or a busy signal to the station port after the co line disconnects which keeps the voice mail or other device from hanging up.