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**Chris** · 11-12-2009, 11:23

Once upon a time, a mechanical exchange would just have sent your connection ratcheting its way up the switch, one hop at a time at whatever speed the pulses came at, within reason. That was how the engineers at the exchange could spot someone trying to tap-dial their way around the requirement to put money in a payphone - it was easy enough for their well-attuned ears to pick out the sound of a switch moving at a different speed to all the others.

These days, the exchanges are digital and it's software that recognises the pulses rather than a direct mechanical system. I would imagine the parameters set in NTL's exchange software are a little less tolerant than that used by BT. This probably isn't something the person who refurbished your phone took into account. You may be able to get the mechanism adjusted so it moves a bit faster. Maybe it just needs a little 3-in-1?

11-12-2009, 11:23	#31
Chris Trollsplatter Cable Forum Team Join Date: Jun 2003 Location: North of Watford Services: Humane elimination of all common Internet pests Posts: 38,403	Re: Pulse dialing query Once upon a time, a mechanical exchange would just have sent your connection ratcheting its way up the switch, one hop at a time at whatever speed the pulses came at, within reason. That was how the engineers at the exchange could spot someone trying to tap-dial their way around the requirement to put money in a payphone - it was easy enough for their well-attuned ears to pick out the sound of a switch moving at a different speed to all the others. These days, the exchanges are digital and it's software that recognises the pulses rather than a direct mechanical system. I would imagine the parameters set in NTL's exchange software are a little less tolerant than that used by BT. This probably isn't something the person who refurbished your phone took into account. You may be able to get the mechanism adjusted so it moves a bit faster. Maybe it just needs a little 3-in-1?