Hi, I'm trying to use the Alcatel Speedtouch USB modem with 2.5.73. I'm facing a configuration problem and couldn't find a solution using Google. The firmware is loaded and the modem is initialized correctly using the following command : /usr/local/bin/modem_run -v 1 -d /proc/bus/usb/001/002 -f /usr/local/bin/mgmt.o -s -m Gotcha, I found your ADSL ALCATEL SpeedTouch USB modem! best offset 6463 with probability 87% best offset 532634 with probability 100% BLOCK1 : 991 bytes uploaded : OK BLOCK2 : 511 bytes downloaded : OK BLOCK3 : 526187 bytes uploaded : OK BLOCK4 : 511 bytes downloaded : OK Reference : 3EC 18607CDAA 02(see under your modem box) ADSL line is blocked? ADSL line is synchronising ADSL line is synchronising ADSL line is up, downstream at 608 kbit/s, upstream at 160 kbit/s ADSL link goes UP Then, I'm using the following command : pppd call adsl But I'm getting the following message : [root@tigre01 src]# Couldn't get channel number: Input/output error Couldn't get channel number: Input/output error Couldn't set tty to PPP discipline: Invalid argument Couldn't set tty to PPP discipline: Invalid argument Couldn't get channel number: Input/output error Couldn't get channel number: Input/output error Couldn't set tty to PPP discipline: Invalid argument Couldn't set tty to PPP discipline: Invalid argument Couldn't get channel number: Input/output error Couldn't get channel number: Input/output error Couldn't set tty to PPP discipline: Invalid argument Couldn't set tty to PPP discipline: Invalid argument Couldn't set tty to PPP discipline: Invalid argument Couldn't get channel number: Input/output error Couldn't get channel number: Input/output error Couldn't set tty to PPP discipline: Invalid argument Couldn't set tty to PPP discipline: Invalid argument Couldn't get channel number: Input/output error Couldn't get channel number: Input/output error Couldn't set tty to PPP discipline: Invalid argument Couldn't set tty to PPP discipline: Invalid argument Couldn't set tty to PPP discipline: Invalid argument Couldn't get channel number: Input/output error Couldn't get channel number: Input/output error Couldn't set tty to PPP discipline: Invalid argument [root@tigre01 src]# I have the following modules loaded : [root@tigre01 src]# lsmod Module Size Used by n_hdlc 14852 0 3c59x 43944 0 speedtch 21936 0 crc32 8576 1 speedtch usbmouse 9472 0 usbkbd 11264 0 hid 29440 0 uhci_hcd 40968 0 usbcore 124756 7 speedtch,usbmouse,usbkbd,hid,uhci_hcd [root@tigre01 src]# May be, it is a configuration problem. Does anyone has an idea about what is wrong in my configuration? What modules are necessary (ppp-async, n_hdlc, speedtch)? May be something is missing in my modprobe.conf or .config file? Thanks for your help Rémi