An OSI transport local nsap remote nsap entity maintains the transport
   counters and generates events resulting from interactions between its
   superior local NSAP and a remote transport service.

1  –  counters

     CONNECTS RECEIVED

         Total number of CR TPDUs, regardless of their disposition, that the
         local NSAP has received from the remote NSAP.

     CONNECTS SENT

         Total number of CR TPDUs sent by the local NSAP to the remote NSAP,
         including retransmissions.

     DUPLICATE PDUS RECEIVED

         Total number of all types of detected duplicate TPDUs received from the
         remote NSAP.

     FAILED CHECKSUMS

         Number of checksum failure events detected.

     LOCAL PROTOCOL ERRORS

         Number of reported local protocol error events. This event is generated
         whenever an ER error TPDU is received from the remote NSAP.

     PDUS RECEIVED

         Total number of all types of TPDUs received from the remote NSAP
         excluding detected duplicates.

     PDUS SENT

         Total number of all types of TPDUs sent to the remote NSAP excluding
         retransmissions.

     REJECTS RECEIVED

         Number of detected reject received events.

     REJECTS SENT

         Number of detected reject sent events.

     REMOTE PROTOCOL ERRORS

         Number of reported invalid tpdu received events.  This event is
         generated whenever the remote NSAP violates the Transport Protocol.

     RETRANSMITTED PDUS

         Total number of all types of retransmitted TPDUs sent to the remote
         NSAP.

     TOTAL OCTETS RECEIVED

         Total number of octets of all types of TPDUs received from the remote
         NSAP, regardless of their disposition. This count includes detected
         duplicates.

     TOTAL OCTETS SENT

         Total number of octets of all types of TPDUs sent to the remote NSAP,
         including retransmissions.

     USER OCTETS RECEIVED

         Total number of user data octets received from the remote NSAP,
         including normal, expedited, connect, accept, and disconnect data. This
         count does not include duplicates such as data retransmitted by the
         remote NSAP.

     USER OCTETS SENT

         Total number of user data octets sent to the remote NSAP, including
         normal, expedited, connect, accept, and disconnect data.  This count
         does not include data retransmitted by the local NSAP.

     USER PDUS DISCARDED

         Number of PDUs received from the remote NSAP that were discarded
         because of insufficient buffer space.

     USER PDUS RECEIVED

         Total number of TPDUs containing user data received from the remote
         NSAP, including normal, expedited, connect, accept, and disconnect
         data.  This count does not include duplicates such as TPDUs
         retransmitted by the remote NSAP.

     USER PDUS SENT

         Total number of TPDUs containing user data sent to the remote NSAP,
         including normal, expedited, connect, accept, and disconnect data. This
         count does not include retransmitted TPDUs.