Talk:Pulse dialing

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[edit] Decoding the pulse train

How are pulses decoded at the telephone exchange? Any volunteers? Thanks in advance!193.251.135.125 20:52, 25 July 2005 (UTC)

No idea how a modern exchange converts them into something sensible, but a crossbar or Strowger exchange literally thwocked the mechanical compenents of the switch around for each pulse, and then dropped onto the next number after a sufficient pause.
This was the time when transatlantic "phonecalls" were done by longwave radio... so it may sound stupidly crude, but thats pretty much how it worked. --Kiand 06:53, 4 January 2006 (UTC)

I don't exactly remember how the pulse relays worked in a crossbar exchange, but I just now briefly described the workings of digit receivers 1ESS switch from the 1970s. Perhaps others will want to ask more detailed questions and jog my memory a little more. Jim.henderson 03:17, 30 March 2007 (UTC)

[edit] Expansion

Good info. I would say this article needs a lot of expansion, showing both classic and modern methods. (added stub status) mrh 20:22, 22 May 2006 (UTC)

[edit] "Tapping" (abuse)

I added this section which I removed from the Rotary phone article because it has a lot more to do with the technology of pulse dialing than it does to do with rotary phones. Cornlad 19:45, 9 August 2006 (UTC)

[edit] question

Which one is good and fast, pulse or tone dialling? Why do phones still have a pulse option? It seems to me that it only prolongs the dialing process, what practical purpose does it serve?

[edit] I think this part is incorrect....

"In rotary systems this" (The need to pause between numbers so the numbers don't bleed together) "is taken care of by having the user wait for the rotor to revolve back to the start position before the next digit can be dialed."

This is not so. The pause is taken care of by the user putting his or her finger in the dial rotor and turning it to dial the next number. When the user releases the rotor, it will switch the line on and off the correct number of times [b]as the rotor returns [/b] to the resting position (waiting for the next number to be dialed).

I used to tap-dial telephones all the time... tore a few rotary phones apart to see how they worked.

Eyknough 03:26, 29 March 2007 (UTC)

It looks correct to me. After the last pulse is sent the dial continues to rotate without sending pulses until it reaches the resting position. The next digit can be dialed immediately the dial stops rotating. -- Nick 16:47, 31 March 2007 (UTC)
I agree; what you say sounds correct. But there only needs to be a very short pause between pulses for the numbers to be distinguished. The article seemed to say that the pulses are sent as you rotate the dial, then the long pause waiting for the dial to return to resting postition is what is necessary to distinguish between numbers. It takes about 1/4 second pause between numbers to work effectively. This is long enough for one to dial the next number, no matter how quickly it is dialed. Eyknough 20:14, 3 April 2007 (UTC)
Recoil spring is explained in rotary dial. Perhaps the matter should be clarified here, or the articles merged. Probably the former, explaining dial pulse operation from the receiver point of view. Jim.henderson 17:17, 31 March 2007 (UTC)

[edit] Tapping

It is said: "(But see above if you are in Sweden, New Zealand or Oslo.)" - nothing to be found "above". —The preceding unsigned comment was added by 85.216.23.182 (talk) 12:24, 13 May 2007 (UTC).

That would be paragraph 3, "Two exceptions to this are New Zealand, with [...] and Sweden, with [...]". No idea about Oslo, though. Sabik (talk) 12:44, 19 November 2007 (UTC)

[edit] Incorrect date?

RE: (These were phased out between 1958 and 1994 as subscriber trunk dialling was introduced.)

The push button A and B phones were phased out in the 1960s bar perhaps one or two in the Highlands. This is presumably a typo.

86.132.164.67 22:16, 2 September 2007 (UTC) Peter Thurston