USB modem with Redhat 7.3

Brad Hards bhards at
Tue Nov 12 07:07:52 EST 2002

Hash: SHA1

On Tue, 12 Nov 2002 01:09, Robert Cohen wrote:
> Hi, is anyone using a USB modem with linux generally or with Redhat 7.3
> specifically.
I used one for a while, before getting ADSL.

> I bought a netcomm Rave USB modem.
Not familiar with this product name.
> Nov 12 09:54:40 localhost kernel: usb.c: USB device 4 (vend/prod
> 0x483/0x7554) is not claimed by any active driver.
This means that there is no kernel driver suitable, that is loaded right now.

> Nov 12 09:54:56 localhost /etc/hotplug/usb.agent: Setup acm CDCEther for
> USB product 483/7554/200
and this means that we'll try and load one. In fact, based on the descriptors, 
we'll try for two that might work.

> in /var/log/messages. And from what I have found on the net the acm
> module is the correct one for a USB modem.
For a POTS modem, yes.

> Documentation appears to indicate that I should talk to the modem at
> /dev/usb/ttyACM0.
> I didnt have such a device but I created it with mknod /dev/usb/ttyACM0
> c 166 0
Looks OK, although the device nodes should have existed.

> But I can't open that device sucessfully.
That isn't a good sign.

> I'm beginning to suspect this may be some weird kind of softmodem.
It would help to see the contents of /proc/bus/usb/devices,  however I think 
you are right.
0x0483 is the vendor ID for STMicroelectronics, and they are notorious for 
making controller-less modems. STV7554 is one of those products.
A quick bit of searching showed that there are a few places that have (binary 
only) drivers - for example,

Not sure how good those drivers are. My USB modem is ACM compliant.


- -- 22-25Jan2003. Perth, Aust. I'm registered. Are you?
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see


More information about the linux mailing list