NETWORK SERVICE
        Default: CLNS                                Value: any, CLNS, or CONS

        Type of network service. The network service chosen must be compatible 
        with the value of the protocol class attribute.

        ANY -  Either.

        CLNS - Connectionless Network Service.

        CONS - Connection-Oriented Network Service.


    RETRANSMIT THRESHOLD
        Default: 8                                Value: 0 - ( 2 to the 23rd ) 

        Number of times a TPDU requiring acknowledgment is to be retransmitted 
        before it is assumed that network connectivity has failed.  This
        attribute is valid for protocol class 4 only.


    SECURITY
        Default: Null Value                       Value: Octet String
        
        An octet string to be transmitted in the security parameter of a CR or 
        CC TPDU. A null value causes the security parameter to be omitted from 
        the TPDU.  For security reasons, this attribute cannot be displayed.

    SEND IMPLEMENTATION ID
        Default: True                             Value: Boolean
        
        Indicates whether the implementation id should be sent in the CR if the 
        proposed protocol class is 2 or 4. It is always returned in the CC if 
        it is present in the CR.


    SEND PREFERRED MAXIMUM TPDU SIZE
        Default: True                              Value: Boolean
        
        Indicates whether the preferred maximum TPDU size parameter should 
        be sent in the CR TPDU.

        If the preferred maximum TPDU size parameter was present in the CR 
        TPDU, then it indicates whether the preferred maximum TPDU size 
        parameter should be sent in the CC TPDU.

        The default value of this characteristic should not be changed unless 
        the remote implementation does not conform to ISO 8073.


    SEND REQUEST ACKNOWLEDGMENT
        Default: True                               Value: Boolean

        Indicates whether the request acknowledgment parameter should be sent 
        in the CR TPDU.

        If the request acknowledgment parameter was present in the CR TPDU, then 
        it indicates whether the request acknowledgment parameter should be 
        sent in the CC TPDU.

        The default of this characteristic should not be changed unless the
        remote implementation does not conform to ISO 8073.


    USE CLNS ERROR REPORTS
        Default: False                               Value: Boolean
        
        Indicates whether the network Routing layer's error report facility 
        should be used when performing connection establishment.  If set to 
        true, this may result in faster detection of an unreachable node at 
        the time of connection establishment.  This characteristic should not 
        be set to true on an end system that is either dual-railed or 
        connected to a network that has a high probability of duplication.  
        This is valid only if network service equals CLNS.