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In article <1992Sep3.191324.14987@cco.caltech.edu> sergeb@cco.caltech.edu (Serge J. Belongie) writes:
>From: sergeb@cco.caltech.edu (Serge J. Belongie)
>Subject: Need phone line sp
>Date: Thu, 3 Sep 1992 19:13:24 GMT

>Hello,
> 
>I need to know some of the specifications for phone line levels, namely:

>Vac, Vdc for:   Phone Onhook
>                Phone Offhook (dialtone)
>                Phone Offhook (button pressed)
>                Phone Onhook (ring incoming at ??hz)

>I have made some rather crude measurements myself with a multimeter,
>but they seem to change each time I measure them.  I tried checking
>the CCITT standards ftp sites, but they seem to have all disappeared.
>Any help with this information would be greatly appreciated.

>Serge

This is the spec in Norway! I guess it is international but I'm not quite 
sure. 
      Phone onhook/offhook 48 Vdc. (no ac)
      Phone onhook ring incoming  about 90 Vac (about 10-30Hz)

The impedance is set to 600 ohms, so that's why you get those strange
values when you measure. It depends on the internal impedance in each phone 
and on the line.

Sverre H. Stendal