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From: Ed Michaels <edmic..._at_comcast.net>
Date: Tue, 6 Dec 2011 21:11:43 -0500

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From: "teimat" <MTri..._at_TrinidadEngineering.com>
To: "TSCM-L Professionals List" <TSCM-..._at_googlegroups.com>
Subject: secure dsl & phone lines
Date: Wed, 28 Mar 2007 09:49:37 -0700
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Had a recent post on bridge taps on a dsl line. It turned out to be
true. We also had bridge taps on our phone line and on the spare pair
in the cable.

My question is; How can you be sure if everything is clear on the
line when you can't legally inspect the lines?

The test details follow;

DSL line still has a deep negative spike at the boot but not as bad as
when the bridge tap was connected. Had the tech open the lines at the
C.O. and did a resistance test with a fluke 87 V. Reading bounced
between OL (open) and some Mohm reading but the Mohm reading did not
stay on the screen long enough to read. The capacitance was 0.24
which is about 15,000 feet and this seems to agreed with the phone
company's estimate from the C.O. When the line was open, our tdr
didn't measure the open distance to the C.0. The unit is a dynatel
965DSP and is capable of measuring 30,000 feet and finding a bridge
tap at 18,000 feet on a 20,000 foot line.

I am still concerned attachments and/or bad connections exist. When I
questioned the phone company tech about the deep neg on the tdr at
the boot he didn't seem to have an answer. He also did not bring out
a tdr on site to locate the problem.

P.S.

I talked to Jim A. about this and he suggested I go through our DSL
provider and they inturn would go through the phone company. I was
not impressed with the DSL provider's equipment because it didn't find
the charateristic negative pulse you see on a bridge tap but it
obviously was there. I was also surprized the phone company didn't
bring out a tdr to find the tap and relied on "the customer" to tell
them where it was???
Received on Sat Mar 02 2024 - 00:57:27 CST