DSL inside wiring mystery

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 Question by Matthew Klionsky posted 15 Jul 2005
 DSL inside wiring mystery
I've had voice-over SBC/Ameritech DSL for several years, with a stable and unchanged configuration, using Cat5 cable from the DSL jack endpoint to a point inside my basement (a foot away from where the NID is mounted outside). Other wiring is old 4-color solid copper. The wiring configuration is hybrid (house is 100+ years old). There are filters in place for the 6 telephones, and there are a number of wired but un-used jacks.

A couple of days ago, the connection signal failed. I tried disconnecting all the phones and filters, but still got no signal. Ditto when I tried the modem at other phone jacks besides the usual location attached to the cat5 cable. However, when I connect the modem directly to the NID outside, I DO get a DSL signal.

So, I know the modem works. And, I know all my phones work, so the wiring is all at least connected. But, even with nothing plugged into any phone jack EXCEPT for the DSL modem, I'm not getting a DSL signal inside. And, like I said, this is a sudden change - everything worked fine until recently.

Any ideas what could cause this? How can I diagnose it? As mentioned, I already have no-splice, no-tap direct cat 5 cable from my usual DSL modem location to a point as close as possible to my NID.

One thing that I don't think is related, but worth mentioning: Until this problem, my DSL always worked fine EXCEPT when it was raining outside. Rain was commonly associated with loss of the DSL signal. However, even then, if I made a voice call, the DSL signal would almost always re-connect within a minute or so. The present DSL signal failure is during beautiful weather, and making a voice call has no effect.

I'm stumped, and looking for advice!

Please reply to klionsky@ameritech.net
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 Answer by Joseph Golan posted 23 Jul 2005
Dear Matthew,

I think you may have a line grounded or has a high resistance short to ground. To test for this, disconnect all the equipment in the house and separate the line at the NID. Use a Multimeter set to measure DC resistance (ohms) with one lead connected to ta good ground, take the other lead and measure all the open individual leads. Make sure the meter is set to a fairly high scale. The hint you gave me is that the line went bad when raining.

Sincerely,
Joseph Golan, RCDD

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