Thank you for giving me so much help with my networking problem. Finally, 
the following worked best:

ifconfig ppp0 inet 0.0.0.0 -arp -trailers 0.0.0.0
[connecting via kermit]
pppd /dev/tty00 9600 defaultroute
ifconfig ppp0 up
ping some.host

But one little question appeared: how can I connect to the terminalserver 
without using kermit. Two things I dont like - having to connect with 
9600 baud instead of 14400 (kermit doesn't know 14400) and typing the 
same commands every time.
Yes, I tried the chat-program but found no option to set the speed and 
I can't see what chat does because all it's output is sent to /dev/tty00 
(chat normally outputs to screen -  therefore I typed 
'chat -f chatscript >/dev/tty00 </dev/tty00'). This really dialed my 
terminalserver but after this nothing happened. Any idea?

Thanx in advance,
	Stephan Quitzsch