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Subject: Re: FILTER for Computer Phone Line
Date: Mon, 6 Jan 2003 22:47:18 +1300
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
You might find yourself pushing the limits here
Modern modems use the entire bandwidth, if you can hear a click or a pop,
then filtering it out only reduces the amount of bandwidth available.
With 10 miles to the exchange, you could almost make them an offer to run
fiber to your door :-) and go digital.
The best bet is always to find the source of the noise and turn it off.
Sometimes asking the supplier to swap to a different pair in the bundle will
also help as it could be a noisy adjacent pair.. If there are and spares of
and last option ADSL ? if its available, it uses a different part of the
spectrum and might solve your problems or at least give you a 256k modem.
"ddwyer" wrote in message
> In article , Howard Davis
> >Verizon has repeatedly checked the line, and finds nothing wrong. They
> >the noise is within acceptable limits for a voice line, and make no
> >guarantees of useability for a computer. I want to design a passive (LCL)
> >lowpass filter for the line, and need the information requested in my
> >to do so.
> Im on 10 miles of wire from my exchange. The line is noisy, picks up hum
> and clicks from electric fences.
> When I upgraded to the best v92? modem THINGS GOT WORSE.
> Often no connection could be made, 7k was a typical successful
> connection as indicated by windows .
> I spoke severely to my pots provider and stated (honestly) that
> conversation was difficult and I was losing business as customers with
> low signal level could not be understood. Eventually after threats of
> legal action they spent weeks up and down the line improving to where
> the hum was much better and noise level eliminated. finally they
> introduced a hum filter so tha6 the line was near perfect, now I connect
> at 37k on the best days , dropouts could by my pop.
> Already the hum is increasing as ground resistance changes and the line
> balance is upset but still much better.
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