On 5/7/2011 4:03 PM, Jim Thompson wrote:
Question for your guys experienced in telephone circuits...

Every 30 minutes it looks like my on-hook voltage drops from 50VDC to
ZERO for a fraction of a second.

It happens so fast I can't get an accurate read on it... but the
auto-ranging DVM drops from "V" to "mV"

What is this all about?

...Jim Thompson

Some one may be working at the CO.

Moving a rack or something.

It was like this when I got DSL.

My Caller ID box went berserk over this for days, then it stopped.

hamilton