"Transport Classes to support?"

    Enter the number of the transport protocol class you want to
    use for this template. DECnet-Plus for OpenVMS supports three
    transport protocol classes: 0, 2, and 4. If you select CONS as
    the network service type, the default is 0,2,4. If you select
    CLNS, the default is 4. If you select RFC1006 as the network
    service type, the default is 0,4.  However, you can configure
    multiple OSI templates.

    The features of the transport service provided by each of these
    protocol classes are as follows:

    o  Class 0

       Class 0 is the most basic type of transport service, in which
       there is no flow control, multiplexing, or error recovery.

    o  Class 2

       A class 2 transport service provides all the functions of
       a class 0 service, and also provides multiplexing and flow
       control. The OSI Transport Service software always uses flow
       control measures on class 2 connections, even though the
       transport protocol standard defines this feature as being
       optional within class 2.

    o  Class 4

       A class 4 transport service provides all the functions of a
       class 2 service and, in addition, provides error detection and
       recovery.