Teledat USB 2 a/b Blocks the Phone Line

Support knowledgebase (thallma_usb_teledat)
Applies to

SuSE Linux: Versions up to (including) 7.2
This article refers to an older version of SuSE Linux. Therefore some of the informations given in this article may be outdated or the article may contain stale links.

Symptom

After you start SuSE Linux, you are not able to use your phone, and the LED display of your Teledat USB 2 a/b unit indicates an ongoing communication flow between your PC and the telephone system.

Cause

The USB drivers in Linux try to initialize all connected devices according to the USB standard. Teledat USB 2 a/b does not seem to be able to handle this initialization, which results in an endless loop.

Solution

Since the (German) Telecom does not offer any drivers for this device, and the Capi4Linux driver from AVM is not suitable for this device, it is impossible to provide support. However, an adapted Capi4Linux driver that was modified for Teledat USB 2 a/b is available at the following URL:

http://www.h07.org/index.php

Please note that we do not provide installation support for this driver. Furthermore, this Web page does not offer precompiled modules for all kernel versions.

If you can not get this module to work or no precompiled module is available for your kernel version, there are two ways to circumvent problems with Teledat USB 2 a/b:

a) Detach your telephone system from the USB bus.
b) Deactivate the USB support in Linux. This can be done as follows:

Edit /etc/rc.config using the following menu in YaST1:

Set the parameter START_USB to no. In addition, the module usbcore must be removed from the parameter INITRD_MODULES.

After these modifications, enter the following commands as administrator root:

mk_initrd
lilo

Now disable the following line in the file /etc/modules.conf (using a #):

alias usb-hostadapter usb-uhci
or
alias usb-hostadapter usb-ohci

At the next system boot, USB support will no longer be active.

See also:
o ISDN Terminaladapter

Keywords: USB, TELEDAT, TELEFON

Categories: ISDN

SDB-thallma_usb_teledat, Copyright SuSE Linux AG, Nürnberg, Germany - Version: 01. Feb 2002
SuSE Linux AG - Last generated: 01. Feb 2002 by tino (sdb_gen 1.40.0)