First of all, thanks so much guys, especially Marvin and John, Right now, I'm writing this email from my linux box without any disconnecting :-) According to John reply, setting lcp-echo-interval and lcp-echo-failure didn't solve the problem..... Anyway, thanks again, John. Regarding Marvin response, it solved my problem, but the line "Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +MS=34" should be changed to "Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +MS=V34" for my modem. Sincerely, Habib Seifzadeh ----- Original Message ---- > From: Marvin Stodolsky <marvin.stodolsky@xxxxxxxxx> > To: Habib Seifzadeh <habibseifzadeh@xxxxxxxxx> > Cc: discuss@xxxxxxxxxxxxx > Sent: Wednesday, November 19, 2008 2:48:05 AM > Subject: Re: What's the best init string for noisy lines? > > Habib, > > At http://linmodems.technion.ac.il, there is a Post Install Howto > which may be useful. One potential fix is to reduce the default V92 > compression (+MS=92) which is poorly implemented at some IPs. Try > first V34 compression with: > Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +MS=34 > > If that allows your staying on line longer, try V90 with > Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +MS=90 > > MarvS > > On Tue, Nov 18, 2008 at 9:32 AM, Habib Seifzadeh > wrote: > > > > > > Hi all, > > > > Discussing the problem, I have three modems in my home; two of them are based > on Conexant chipset which work properly by linuxant driver and the other one is > > Smartlink which works with sl-modem-daemon. So, I don't have any > > problem with installing the drivers. All of them connect to ISP and > > transmit info. Also, the OS is Ubuntu 8.10 > > > > The problem is that > > all of them disconnect from ISP frequently (About every 2 or 3 minutes) > > when I'm in linux but none of them have such problem in Windows XP! I think > the reason is my noisy phone line but Windows XP knows how to recover from > noises. > > > > I > > changed some settings like lcp-echo-failure and lcp-echo-interval from > > /etc/ppp/options file. By increasing value of them, modem doesn't > > disconnect but no information is transferred 2 or 3 minutes after > > connecting and therefore I'm forced to disconnect manually. So, they > > can't solve the main problem.... > > > > I > > guess the issue is solved by changing initial strings in dialing > > program configuaration files (e.g. /etc/wvdial.conf). After surfing the > > net, I figured out that thare are some AT Commands in modems for > > recovering from noise. I think that Windows XP uses these commands so > > that the modem doesn't disconnect at all. There are some pages which > > describe AT Commanands but I couldn't find any one which solve the > > problem cleanly. Does anyone have any information about these AT > > Commands? > > > > By the way, I browsed the .inf file of one of my > > conexant modem's driver. I found this line: > > AT&FE0V1S0=0L3&C1&D2+MR=2;+DR=1;+ER=1;W2. When I use this > > command in wvdial.conf, the modem responds "Ok" but the problem still > > remains... :-( > > > > Any help would be appreciated. > > Habib Seifzadeh > > > > > > > > > >
