BUFFERS TEMPORARILY UNAVAILABLE

         Number of times the local station could not service messages from the
 	remote station because there were no receive buffers available.

     BUFFERS TOO SMALL

         Number of times the local station could not service messages from the
 	remote station because the receive buffers were not large enough.

     INCOMPLETE REPLIES TO SELECT

         Number of selection intervals that were not properly terminated that
 	is, by a message with the Select bit set in the header, during which
 	a transmission was received or an attempt at transmission was detected.
 	This counter is supported only if the protocol characteristic of the
 	owning ddcmp link entity is set to control, or when the link is a
 	half-duplex, point-to-point link.

     LOCAL REPLY TIMEOUTS

         Number of times the local station failed to receive an acknowledgment
 	before the reply timer expired.

     LOCALLY INITIATED STATE CHANGES

         Number of times that the station protocol state changed through action
 	of the local station.

     NAKS RECEIVED INDICATING BUFFER TOO SMALL

         Number of times the remote station reported that it could not service
 	a message because the receive buffer was not large enough.

     NAKS RECEIVED INDICATING BUFFERS TEMPORARILY UNAVAILABLE

         Number of times the remote station reported that it could not service
 	a message because no receive buffer was available.

     NAKS RECEIVED INDICATING DATA FIELD BLOCK CHECK ERROR

         Number of times the remote station reported that a block check error
 	was detected in the data field of an incoming message.

     NAKS RECEIVED INDICATING HEADER BLOCK CHECK ERROR

         Number of times the remote station reported that a block check error
 	was detected in the header block of an incoming message.

     NAKS RECEIVED INDICATING REP RESPONSE

         Number of times the remote station reported that it did not receive
 	all the messages sent from the local station.

     NAKS SENT WITH REP RESPONSE

         Number of times that the local station detected that not all of the
 	messages sent from the remote station were received correctly.

     NO REPLIES TO SELECT

         Number of times that the select timer expired for any of the following
 	reasons:

 	o  No valid control message was received.

         o  No valid header to a data message was received.

        	o  No valid header to a maintenance message from the selected station
 	   was received.

  	o  No transmission from the remote station was received.

 	This counter is supported only if the protocol  characteristic of
 	the owning ddcmp link entity is set to control, or when the link
 	is a half-duplex, point-to-point link.

     PDUS RECEIVED WITH DATA FIELD CHECK BLOCK ERROR

         Number of messages received with a check error in the data field.

     PDUS RECEIVED WITH HEADER BLOCK CHECK ERROR

         Number of messages received with a check error in the header block.

     RECEIVE ERROR THRESHOLDS REACHED

         Number of times that the receive error threshold has been reached.

     REMOTE REPLY TIMEOUTS

         Number of times the local station received a REP message and sent an
 	acknowledgment in return. This sequence indicates that all messages
 	sent from the remote station have been correctly received.

     REMOTELY INITIATED STATE CHANGES

         Number of changes in the station protocol state caused by action of the
 	remote station.

     SDU OCTETS RECEIVED

         Number of data octets received from the remote station.

     SDU OCTETS SENT

         Number of data octets sent to the remote station.

     SDUS RECEIVED

         Number of data messages received from the remote station not including
 	retransmissions.

     SDUS SENT

         Number of data messages sent to the remote station not including
 	retransmissions.

     SELECTION ERROR THRESHOLDS REACHED

         Number of times that the selection error threshold has been reached.
 	This counter is not supported if the characteristic protocol of the
 	owning ddcmp link entity is set to tributary.

     SELECTION INTERVALS

         Number of times that the local station selected the remote or a
 	tributary station. The counter does not appear if the link uses the
 	tributary protocol. In addition, the counter appears only when the
 	local station is the control station for a number of tributaries, or is
 	operating over a half-duplex, point-to-point link. This counter is
 	supported only if the protocol characteristic of the owning ddcmp
 	link entity is set to  control, or when the link is a half-duplex,
 	point-to-point link.

     SEND ERROR THRESHOLDS REACHED

         Number of times that the send error threshold has been reached.

     STRTS RECEIVED WHILE IN MAINTENANCE

         Number of times that the local station received a STRT protocol
 	message while in the Maintenance state.