If your DFE-690T is the same thing as the DFE-690TXD then this driver may work for you.  I will post the file here for you as an attachment.
 
README TXT FILE:
===================================
Linux driver for kernel 2.4.X
D-Link DFE-690TXD CardBus PC Card Installation on Linux:
 01.Copy the driver source files to a convenient directory.
 
 02.Compile the source code:
    The instruction for compiling the driver is include at the
    end of the driver file.If a compile-command is not there use
    the following compile command:
             
    *compile-command:
     " gcc -O6 -Wall -DCONFIG_KERNELD -DMODULE -D__KERNEL__ -DLINUX -c
       dfe690.c -I/usr/include/linux/version.h -I/usr/src/linux-2.4.18-3/include/"
   
    Or you can use the Makefile included in the driver disk \\LINUX.
   
    The final file is dfe690.o
 
 03.Copy the module "dfe690.o" to
    "/lib/modules/{kernel-version}/pcmcia"
 
    *The directory "{kernel-version}" stands for the Linux kernel
     version you use.
 
 04.Insert the driver as module:
    insmod dfe690.o
    (Run \'lsmod\' to see if the module is inserted)
 
 05.Edit config:
    ->Add 5 lines to the file "/etc/pcmcia/config"
   
    #
    # Device driver definitions
    #
   
    device "dfe690"                                    (==>Add 1/5)
    class "network" module "dfe690"                    (==>Add 2/5)
   
    :
    :
 
    #
    # CardBus Cards
    #
 
    card "D-Link DFE-690TXD CardBus PC Card"           (==>Add 3/5)
    manfid 0x0149, 0x0000                              (==>Add 4/5)
    bind "dfe690"                                      (==>Add 5/5)
   
    The values 0x0149, 0x0000 are JEDEC ID and can be read by typing
    "cardctl ident" on console with one card on socket.
 
 06.Restart the computer.
 
 *More information about install: man pcmcia