Phone voltage should be 48v off hook.  On hook (when you pick up and get a
dial tone) is -48v.  Ring voltage is 98v.  Variances can be + or - 6v.
Beyond that, you will have problems detecting loop current properly.
Putting a voltage meter on the line should result in -48v being read.

Good luck!

Kyle Elmblade
Distinct Computer Solutions
Sales - Upgrades - Training - Consulting
[log in to unmask]
"A closed mouth gathers no foot"


From: "Eric Johnson" <[log in to unmask]>
Sent: Wednesday, January 09, 2002 6:59 AM
Subject: [PCBUILD] Telephone line question


> Any telephone experts out there? We're having a connection
> problem that I suspect has more to do with the telephone cabling in
> our house than the machine itself. We live in a new developement
> where there is no "official" phone hookups yet - things are not
> always clean and neat here in Mexico ;)  We have cabled in a
> connection from a nearby area where there are real phone
> connections. The total cable length is probably 400 to 500 meters
> (1,300 to 1,600 ft. for you gringos). The cable we're using is the
> black two strand copper telephone wire and there are a number of
> telephones (4 I think) sharing this connection.
>
> At the computer we have a converter that makes the wall connection
> into 2 connections and we have a telephone connected there too.
> Untill recently, we had to disconnect the phone to be able to connect
> with the modem. Now the modem doesn't seem to get a dial tone to
> be able to dial at all. The whole thing has been rather mysterious in
> that sometimes it acts up and other times is doesn't. The phone has
> always worked fine though.
>
> Could we be having a problem with low voltage as a result of the
> distance or perhaps there's a loose connection somewhere along
> the line? Anybody know the correct voltage so I can check it? Any
> suggestions greatly appreciated.
>
> Thanks,
> Eric

                         PCBUILD's List Owners:
                      Bob Wright<[log in to unmask]>
                       Drew Dunn<[log in to unmask]>