On Fri, 13 Jul 2007 19:45:44 +0100, "Ron Jones" <[EMAIL PROTECTED]> wrote:
> >50V IIRC. Also with Broadband the bell wire (No.3) is superfluous. The >lines coming in from BT, go to 2 and 5. In the master scocket there's a bit >of circuitry to make the bell signal on line 3. The microfilter does not >use line 3 at all. Each one has it's own "No.3 generator" for the phone >outlet socket built into it. So if you have your extensions wired up with >lines 2, 3, and 5 - then you actually add more noise to the line as the >third wire acts like an aerial. I disconnected line 3 and got a 30% speed >increase. > Oh dear - going back many years now - but yes about 50V - but constant current source ?? I was more telegraphy rather than telephony - and on our telegraphy circuits we used 20mA loops with + and - 50 Volts for the telex circuits - and then we converted it to radio to communicate with overseas, ships and oil rigs. (:-)) Almost back on topic !!! -- Malcolm
