Andy said:
Thanks.
I don't have an ISP, I use a wireless receiver that uses my apt. account for internet.
I know that I was using hyper terminal at one time with AT commands.
You don't they they broke it ? Just kidding.
My telco is coming out in 2 weeks to check my line.
I can fax fine, but would like some proof of the poor line quality.
I have already check the internal wiring.
The telco gives instruction on how to verify if the static is internal or external by plugging into the outside box.
When I checked, it was inaccessible.
In addition to phone wires, there were cable lines going into the box, so no telling "what's in that box."
There may be a lizard or gecko remains in there partially shorting out the phone lines.
When squirrels in my "hood" venture on to the power lines, a transformer trips.
Take care.
For ADSL, there is "DMT". This is the equivalent of
one of those Hayes AT tests. You can only do this sort
of thing, right at the modem.
http://www.kitz.co.uk/routers/DMTv8.htm
With ADSL, it's the same kind of concept as dialup, only the signals
are arranged above voice band. There are more frequency bins.
(Which is why microfilters are used for a typical home installation,
to separate ADSL high frequency noises, from the voice band for a
POTS phone.)
This picture shows the frequency bins, as read out
of an ADSL modem interface. The modem records these in
real time, but it took a third party developer to write
a nice piece of software so we could actually look at them.
The modem makers won't help us with this stuff. Some modem
firmware upgrades, even break this function.
http://www.kitz.co.uk/routers/images/DMT4.gif
*******
When it comes to static, hum, clicks or other impairments,
you'd be surprised how many times it is actually the
house wiring. Back home, our problem was just "too many
goofy devices" )exceeded loading limit) connected to the
phone wiring (including a strobe light box, that flashed
when the phone would ring, for the basement area). And no,
I didn't add that crap. Other family members did.
In my own home, corrosion on the baseboard RJ-11 connector
boxes, resulted in my old dialup modem dropping to
only 33Kbit/sec operation. Disconnecting the house internal
wires, at the demarcation point, and running a brand new cable
and box to the upstairs, got the dialup modem back to 46K again
(of 53K max).
A friend had a similar issue, and for him, it was where the
cable went through the foundation of his house.
Our telco here, occasionally evaluates line quality. They set
up a table and patio umbrella a couple weeks ago, while
running tests from the CO to our remote box. They don't test
all that often, but we just had it done - they need high quality
lines for their expensive "bundled service packages" - they weren't
doing this to make my analog phone work better :-( They only
do the work, to help them make more money off premium services.
Paul
