Habib, The V32, V90, V92 specify different compression protocols. Evidently your IPs V92 is not fully Linux compatible, so you have to fall back to V34 or V90. These ha ve worked in the past with +MS=34 or +MS=90 Thus it is surprizing that you needed the +MS=V34 Please recheck. There is nothing else I'm aware of which could increase speed. You might read /etc/ppp/options or $ man pppd about adjusting the MTU (tranfer unit size), but I have no intuition whether it will help. MarvS On Thu, Nov 20, 2008 at 8:46 AM, Habib Seifzadeh <habibseifzadeh@xxxxxxxxx> wrote: > Hello again Marvin, > Thanks for your kindness > > Although the init string which you sent works properly, but the Internet speed has been become slow. Is there any way to bring speed and not > disconnecting together? Is there any site which explains how I can tune > my connection by AT commands? > > Sincerely, > Habib Seifzadeh > > > ----- Original Message ---- >> From: Marvin Stodolsky <marvin.stodolsky@xxxxxxxxx> >> To: Habib Seifzadeh <habibseifzadeh@xxxxxxxxx> >> Cc: discuss@xxxxxxxxxxxxx >> Sent: Thursday, November 20, 2008 3:08:27 AM >> Subject: Re: What's the best init string for noisy lines? >> >> Habib >> >> If V90 also works, transmission will be faster, try >> Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +MS=V90 >> >> MarvS >> >> On Wed, Nov 19, 2008 at 2:07 PM, Habib Seifzadeh >> wrote: >> > >> > >> > 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 >> >> To: Habib Seifzadeh >> >> 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 >> >> > >> >> > >> >> > >> >> > >> >> > >> > >> > >> > >> > >> > > > > > >
