It's quite possible for the house wiring to be incorrect because the electrical contractors who initially install the wiring don't respect the polarity mainly because it "works" either way round for most equipment. I have even seen it reversed from the local exchange. IF you have a volt meter then measuring from ground (earth) to the ring will show -48 volts and the tip should read somewhere around +-1 volt It always a good plan to tighten up connections especially if the de markation point is in one of those small boxes outside.I have come accross very noisy lines that worked fine under certain weather conditions and were completely useless at other times. If you have DSL this is first place to look if you have poor bandwidth or the network keeps dropping out. To wrant on a bit longer, corrosion on telephone connectors causes a build up of copper oxides and sulfer etc. these can turn a simple connection into a zener diode, variable resistor or semi-conductor. When you call Bell repair these faults may not show up on the line testing equipment so you get into the situation where B.C. thinks you are a luntic who keeps imagining things. So, when you break dial-tone on your phone you should not hear any strange noises AT ALL. I can't tell you what to do if your demark connection is causing a problem but it doesn't include calling the telephone repair crew.
-- Henry L.Coleman CEO *VoIP-PBX* 1-866-415-5355 Toronto Ontario Canada Fulko Hew said: > On 3/1/07, Henry L.Coleman <[EMAIL PROTECTED]> wrote: > >> From your demarkation point which I guessing is a 25 pair cable going to >> a >> 66 or BIX block the incoming line is: >> blue/white pair or orange/white pair or green/white pair. >> Your house wiring should always deliver the phone line (Tip and Ring) on >> the Green/red pair > > Your saying that blue/white is delivered to green/red? > > My house was wired that blue/white is delivered to red/green. ;-() > >> so if you have a DSL line you would insert the filter > > ... snip ... > > OK, but DSL isn't part of my equation, strictly POTS. > >> PS. >> The polarity of the line is: >> TIP = Green = usually at ground (0 volts) >> RING = Red = Negative -48v on-hook and approx. 80 volts AC ringing > > This is useful info, since I once had an issue with a modem, where > when the wires > were reversed, a phone would work, but the (Telebit) modem would not. > > So if my house was really wired backwards, maybe thats why I had to > special > wire my modem! I'll check it tonight. > >
