host

    Required.

    Remote host to which you want to connect.

 port

    Required.

    TELNET port on the remote host.

 unit

    Optional. Default: 0

    The decimal number specifying the unit number for the pseudo
    device (TNAx). The default 0 specifies that TCP/IP Services
    should pick the next available unit number. If the requested
    unit number is already in use, the next available unit number is
    used. In all cases, the software notifies you of the unit number
    chosen.