Networkcard problems SS5

I have installed Suse on my Sparcstation 5 and almost everything works
fine accept for the network interface.
 
It's a 10BaseT which is connected to a noname 10/100Mbits switch. Only
the link led is burning on the switch but I cannot get the Ethernet
interface to work.
I have tried via DHCP or static IP. The link parameter for the
networkcard in Openboot is True. Test net in openboot is correct but the
card does not receive anything when I test with the command ' watch-net
'. Can anybody tell me if the 10BaseT networkinterface works on
10/100Mbits switches? Any other tips are also very welcome.
 
Thank you in advance.
 
Dick