UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Pulse (Loop Disconnect) to Tone (DTMF) Converter?

Biggles · 22nd Feb 2007, 1:33 pm

The device would have to count the pulses then activate a DTMF tone. I am not sure what time interval window between DTMF tones is acceptable to the PSTN. In other words, if you dialled a nine, this would create quite a delay while the circuit counted the pulses then generated the DTMF tone. I'm just guessing about this, and have never tried it though. I have seen DTMF tone chips and pulse dial chips but never a pulse to DTMF conversion chip. Maybe someone with direct experience of BT networks would be able to help.

Biggles.

22nd Feb 2007, 1:33 pm	#2
Biggles Rest in Peace Join Date: Feb 2004 Location: Hexham, Northumberland, UK. Posts: 2,234	Re: Pulse (Loop Disconnect) to Tone (DTMF) Converter? The device would have to count the pulses then activate a DTMF tone. I am not sure what time interval window between DTMF tones is acceptable to the PSTN. In other words, if you dialled a nine, this would create quite a delay while the circuit counted the pulses then generated the DTMF tone. I'm just guessing about this, and have never tried it though. I have seen DTMF tone chips and pulse dial chips but never a pulse to DTMF conversion chip. Maybe someone with direct experience of BT networks would be able to help. Biggles.