PCMCIA modem bandwidth problem

Hi,

I tried 2 PCMCIA modem cards in the TC1000.
- 3Com MegaHertz model 3CXM756 (56K Global GSM & Cellular Modem PC Card)
- Toshiba SlimV90 (56K)

Both used on a normal phone line.

From whatever location I try, and towards whatever ISP/RAS I do, I'm limited
at 1.5KByte per second (around 11kbps). (Under Mandrake9.1)

Under WindowsXP, I've the expected 56K using the integrated modem or the
PCMCIA cards.

I tried the same cards on a Toshiba laptop (Mandrake 7 or 8), and it works
well (around 4/5 KBytes/sec).

The only difference I can see (apart from the linux distribution), is the IRQ,
as given by setserial : under the TC1000 it is 0 whereas it is 3 on the
Toshiba.

On the PCMCIA HOWTO, I saw that an interruption conflict could cause problems,
and that setting to 0 could solve, but would be slower.
However, I didn't set the IRQ to 0: it is done as soon as I insert the card.

Did you encountered such a problem?

(By the way, is there a way now to make the internal modem work under Linux?)

Cheers,

Mathieu
Received on Wed Aug 20 15:29:40 2003