Unless stated otherwise, counts include both normal and multicast traffic
   and all protocol types, service access points SAPs, and protocol identifiers.

     MULTICAST OCTETS RECEIVED

         Number of multicast data octets that were successfully received and
         made available to the port user. The count is the number of octets in
         the CSMA/CD user data field and does not include MAC medium access
         control, a sublayer of the CSMA/CD Data Link layer headers. Comparing
         this count to the octets received count yields the gross percentage
         of bandwidth that was consumed over time by multicast PDUs received
         by the port.

     MULTICAST OCTETS SENT

         Number of multicast data octets that were successfully sent through the
         port. The count is the number of octets in the MAC user data field,
         including any padding or length fields; it does not include MAC
         headers.   Comparing this count to the octets sent count yields the
         gross percentage of bandwidth that was consumed over time by multicast
         PDUs transmitted by the port.

     MULTICAST PDUS RECEIVED

         Number of multicast PDUs that were successfully received and made
         available to the port user. Counted PDUs passed address and protocol
         filtering and were received without errors. Comparing this count to the
         PDUs received count yields a gross percentage of CSMA/CD usage for
         multicast pdus received by this port.

     MULTICAST PDUS SENT

         Number of multicast PDUs that were successfully sent through the port.
         Comparing this count to the PDUs sent count yields a gross percentage
         of CSMA/CD usage for multicast PDUs sent by this port.

     OCTETS RECEIVED

         Total number of MAC user data octets that were successfully received
         and made available to the port user. Counted frames passed address and
         protocol filtering for both individual and multicast MAC addresses and
         were received without errors. The count is the number of octets in the
         CSMA/CD user data field plus any padding, Ethernet length fields, or
         logical link control LLC header fields;  it does not include MAC
         headers. Adding the octets received count to the protocol overhead
         calculated from the pdus received count yields the amount of CSMA/CD
         bandwidth consumed by frames received by the port.

     OCTETS SENT

         Total number of user data octets that were successfully sent through
         the port. The count is the number of octets in the MAC user data field
         including any padding or length fields; it does not include MAC headers.
         Adding the octets sent count to the protocol overhead calculated from
         the PDUs sent count yields the amount of CSMA/CD bandwidth consumed
         over time by frames sent by the port.

     PDUS RECEIVED

         Total number of PDUs that were successfully received and made available
         to the port user. Counted PDUs passed address and protocol filtering
         and were received without errors. The count provides a gross
         measurement of incoming CSMA/CD usage by the port.

     PDUS SENT

         Total number of PDUs that were successfully sent through the port. The
         count provides a gross measurement of outgoing CSMA/CD usage by the
         port.

     UNAVAILABLE USER BUFFERS

         Number of times that no user buffer was available at the port for an
         incoming frame that passed all filtering for the port. Used in
         conjunction with the PDUs received count, this counter can indicate
         the rate of user buffer receive problems.