sekoppenhoef@rose.waterloo.edu (Shawn E. Koppenhoefer) (11/22/89)
>>For most phone lines there are four wires. They are really two pairs of >>wires. Each pair is for a separate phone line. ... >Sometimes yes, sometimes no. There are about ten different ways that a >four-wire modular jack can be hooked up. The usual scheme with one phone I was the author of the latest original question here. The setup that I finally arrived at was to hook a LED_red in series with a 5ohm resistor to the green and yellow lines on my phone. I left the red and black (i think black is ground) alone. This provides *my* end of the phone with a red light when either it or the other phone is off the hook. Unfortunately my light sucks too much power from the line so that the *other* led on the other phone cannot shine RED. I suppose the solution is an op-amp or something but I'm naive in this area. It is ok as it is... At least *I* know when the line is in use... the other phone doesn't though. <sigh> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| _ _ KLEIN BOTTLE for sale... Shawn E. Koppenhoefer | | enquire within. ...watmath!rose!sekoppenhoef | - ~~~~~~~~~~~~~~~~~sekoppenhoef@rose.uwaterloo.ca sekoppenhoef@rose.uwaterloo.edu