Re: Can a microfilterless phone disrupt your ADSL signal?

DTC <no_spam@xxxxxxxxxxxxxxxxxxxxx> wrote in part:
Franc Zabkar wrote:
FWIW, I used to have two phone lines, one for a dialup modem and one
for voice. I once tested my setup by disabling my modem's error
correction and connecting to my ISP via a comms app (HyperTerminal). I
then rang my voice line. During the ringing, the crosstalk between the
two wire pairs was serious enough to flood the terminal window with
dozens of spurious characters.

The telephone company uses twisted pairs with hundreds of
pairs in a bundle in the aerial and buried plant without
any problems at all with millivolt level voice signals
running directly adjacent to 90 volt AC ringing.

Fully agreed. 5-15 thousand feet of tight bundle run to the
typical phone. The pairs are carefully twisted and allocated..
Crosstalk happens when pairs are split.


Some possibilities to explain the cross-talk on your installation are:

1) You home has been wired with the old JK inside wire (known
as "Jake" to telephone installers) which is untwisted pairs.

Sure. But quad isn't so horrible for crosstalk if the pairs
are allocated on the diagonal.


2) You are using a lot of 20 or 40 ft flat silver satin
non-twisted station cords around your place.

Flat silver satin isn't great for crosstalk, and very much
worse if the pairs are not nested USOC.

3) Grunge in you wall outlets.

Unlikely. But poor (hi resistance) connections might generate
noise with ringing current.

4) You might have low quality multi-line KSUless phones.

Quite possible. Unplug to check.


-- Robert

.

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