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 <habibseifzadeh@xxxxxxxxx> 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 > > > > >
