Creates an instance of a CSMA-CD station, using the specified
    communications device.  The Communication Port argument is
    required.

    create  [node node-id] csma-cd station station-name -
            communication port port-id

    Communication Port

    The Communication Port is the system device name assigned to
    this station.

    On Tru64 UNIX the port-id must be in the format ddn, where dd
    is the device name prefix and n is the device number.

    On OpenVMS the port-id must be in the format ddc, where dd is
    the device name prefix and c is the controller letter.

    Device Type  Tru64 UNIX 	 OpenVMS

    DEBNA                           et
    DEBNI                           et
    DELQA                           xq
    DELUA                           xe
    DEMNA           xna             ex
    DESVA                           es
    DEUNA                           xe
    DE422           ln              er
    KFE-32                          ef
    LANCE           ln
    PMAD            ln              ec
    SGEC                            ez
    TGEC            te
    TULIP           tu              ew

    Example:

    create csma-cd station csmacd-0 communication port EWA

1  –  Exception Messages

 o  already exists

    A csma-cd station entity by that instance name already exists.

 o  contraint violation

    That controller is already in use by some other csma-cd station.

 o  process failure

    The communication port provided is invalid.

 o  communication port in use

    The communication port is already reserved by another entity.

 o  invalid communications port

    You cannot run CSMA/CD data links on this communications port.

 o  no such object instance

    The CSMA-CD module has probably not been created yet.   On
    OpenVMS, verify the contents of your NET$CSMACD_STARTUP.NCL
    script.  You may need to run net$configure to reconfigure your
    devices.