I have succeeded in using the 9210 as modem (HSCSD) with my Dell Latitude C610 under SuSE Linux 8.0. I achieved average speeds around 2.5kB/s for large files, with suboptimal reception (antenna symbol hopping between three and four bars).
DISCLAIMER: All information given below is provided without any warranty!
Start Extras/Faxmodem, open settings:
Connection/Connection type: Infrared
Operating System/Win 2000 : YES
/Connection type : High Speed /Remote modem type: ISDN V.110 /Max. conn. speed : 28800
Connection/Connection type : Cable
/Transfer rate : 38400 /Data bits : 8 /Stop bits : 1 /Flow control : Software
Operating System: see IR
Click done, then Activate.
NOTE: If you use nfsclient to transfer data to your Linux machine (www.koeniglich.de(http://www.koeniglich.de/)), you have to terminate that first, since it blocks the serial port otherwise.
BIOS: Activate IR on port COM4:, I have FIR activated, but don't think that matters here.
IRDA: You must have package irda installed and running. In /etc/sysconfig/irda, set IRDA_PORT=/dev/ttyS3. You may have to activate IrDA manually in the YaST Runlevel Editor.
Modem Config: SuSE does not detect the modem automatically. So start YaST/Basic Networking/Modem Config and install a new modem
Device: IR : /dev/ircomm0 Cable : /dev/ttyS0 Speed : 38400 (yes, that's more than above, but pppd doesn't like 28800).
Click on "Details" and set modem commands as follows:
INIT1="AT" INIT2="AT&FV1E0&D2&S0&C1S0=0+CBST=81,0,1" INIT3="AT+CHSN=0,3,0,12;+DS=3"
(don't type the ""!).
Comments: +CBST= and +CHSN= select protocol and speed for HSCSD at 38400 with V.110 ISDN. You may have to change the parameters to these commands if you want to use other speeds/protocols. +DS=3 chooses compression.
http://www.nokia.com/phones/productsupport/9210/downloads.html(http://www.nokia.com/phones/productsupport/9210/downloads.html) section AT commands.
This recipe is a courtesy of Hans Ekkehard Plesser.