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Old 12-03-2001, 02:16 PM   #1
bengele
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Modem issues


I had a 33.6 ISA modem that I wanted to replace with a 56K to try a squeeze a little more performance out of my Internet connection. The main problem what that it seemed as if I could only get one active connection at a time. So if I was say for instance downloading a file and wanted to surf the web at the same time my web browser would keep timing out while trying to connect to a server. I have sense tried three different 56K modems (2 pci and 1 external). All three of these modems have had a problem of randomly disconnecting with a signal of 16 (hang up) and my original problem of only having one connection remains even though my download speeds did increase. I have also tried two different dialers (KPPP and wvdial) and changed my MTU and MTR to 512 each.

Any help or suggestions on what else I could try would be greatly appreciated.
 
Old 12-04-2001, 02:59 PM   #2
doris
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I didn't quite follow you. So point it out if i'm an answering your question.

It seems to me not a problem of the modems. Once the modem is connected, you are able to use multiple network applications. The ftp server may stop service if your network is too slow. I had a modem and it was shared by three computers (linux and windows). It ran ok. But I did have similar time out problems when I was using another ISP.

Is this problem the same when you download from other servers?
 
Old 12-04-2001, 03:46 PM   #3
bengele
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In the example I gave before (FTP download while surfing) I would normaly have problems with the surfing but the download would complete normaly. It's almost as if the FTP takes all of the bandwidth and won't share any with the browser. This is not spacific to FTP and browsing. If I where for example downloading e-mail I would not be able to get a telnet session to open because it would time out. This is on a dual boot (Linux/Windows) machine. I didn't have this problem in Windows with my 33.6 modem but I haven't booted into Windows sence I got a 56K modem though I think I will try that tonight.

As far as the disconnecting goes I didn't have this problem with my 33.6 modem and the same ISP. Could it be possible that my ISP is having problems with only 56k modems? As I mentioned earlier I havn't booted into Windows sence I got a 56K modem so if I get knocked off in Window I will assume it is a problem with my ISP.
 
Old 12-04-2001, 08:37 PM   #4
doris
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I didn't use dual modems. When I use modem and ethernet card, I may run ifconfig to see how many packets go through two external interfaces.

If the timeout problem is consistant, it isn't like an ISP problem.

Doris
 
Old 04-29-2003, 09:56 AM   #5
farhan
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ur analog tel line is ap of 4 khz which is digitized by PCM or any othe tech. using the login of nyquist ,or shannon model is equal to 64kbps ....soif there is a noise or any other problem with the isp RAS then u whould use the old 33.6 modem bcz it hava greater ability to tackle with noise..and i prefer to use 33.6 or 56k isa mdoem hard jumpered on the any pci modem bcz old isa modems have grand power to work with niosed line..they have a good relay for noise handelling...i suggest u all to hear in ur telephone is tehre any noise in it...if yes then pls change the tel wire with out any joints in it. terminate the tel wire directly on the modem and then the remaining to tel-extensions... another thing while using modem if ur modem is v.90 supported then pls remove all tel extensions and only plug tel wire i the modem jack..bcz when ever the handset is lifted up..a great voltage signal loss result...which result in DC if u hold a bit longer

another thing i wana make clear is that y modem r of only 56k y not of 64 k answer to it is ...when the analog sin wave is sampled the modem's modeulation techinques use 7 bits for representation of differnt levels so 2 raise-to-the-power 8 =256 levels and 2 raise-to-the-power7 r 128 which r less levels.. so simply to understand because of useing 1 less bit u got 7 bits and 128 levels which result in 56kmdoem and diff mdoulation tech r used ..so thats the reason u loos 8K because of losign 1 bit
 
  


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