1. 3C503N.EXE Driver
2. TPOPTS.TXT File Contents

TPOPTS.TXT Driver File Contents (3C503N.EXE)

                               3Com Corporation
                EtherDisk Diskette for the EtherLink II Adapters
                         Physical Transmission Options



  The EtherLink II TP adapter has six options that control data transmission 
  on the physical medium.  These options are set by moving jumpers on the
  adapter. 

  This file contains information that will help you set these options so that
  the EtherLink II TP adapter will work correctly with both 10BASE-T and 
  non-10BASE-T hubs.  For more detailed information, refer to the
  EtherLink II TP Adapter Guide.

  NOTE: This file applies only to the EtherLink II TP adapter. For 
        information on the EtherLink II/16 TP Adapter, please refer
        to the EtherLink II/16 TP Adapter Guide.


  Wire Impedance
  --------------

  Set the WIRE IMPEDANCE jumpers to match the characteristic impedance of your
  cable.

  Use a standard test device to verify the characteristic impedance of your 
  cable from the wiring closet to the station.  Use the 100-ohms setting if
  you are connecting to standard 10BASE-T wiring.

  The available settings are:

     Setting            Impedance Range
     -------            ---------------
     75                 70-85 ohms
     100                85-115 ohms
     150                115-160 ohms


  Other Options
  -------------

  The other jumpers should be set according to the following table:

                                             HP StarLAN 10,
                            SynOptics        AT&T STARLAN 10,
                10BASE-T    LattisNet        DAVID Systems      BULL Hub 10
 Jumper         (default)   (non-10BASE-T)   (non-10BASE-T)     (non-10BASE-T)
 --------       ---------   --------------   --------------     --------------

 LINK PULSE     ON          OFF              OFF                OFF

 EQUALIZATION   TX          RX               TX                 RX

 DC SIGNAL      OFF         ON               OFF                OFF

 TRANSMIT
 LEVEL          NORM        LOW              NORM               LOW

 RECEIVE
 THRESHOLD      NORM        LOW              NORM               LOW





       (%VER  Physical Transmission Options v3.4a)


How To Update Drivers Manually

After your driver has been downloaded, follow these simple steps to install it.

• Expand the archive file (if the download file is in zip or rar format).

• If the expanded file has an .exe extension, double click it and follow the installation instructions.

• Otherwise, open Device Manager by right-clicking the Start menu and selecting Device Manager.

• Find the device and model you want to update in the device list.

• Double-click on it to open the Properties dialog box.

• From the Properties dialog box, select the Driver tab.

• Click the Update Driver button, then follow the instructions.

Very important: You must reboot your system to ensure that any driver updates have taken effect.

For more help, visit our Driver Support section for step-by-step videos on how to install drivers for every file type.