o  buffers temporarily unavailable

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

 o  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.

 o  creation time

    Time at which this entity was created.

 o  incomplete replies to select

    Specifies the 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.

 o  local reply timeouts

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

 o  locally initiated state changes

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

 o  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.

 o  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.

 o  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.

 o  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.

 o  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.

 o  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.

 o  no replies to select

    Specifies the 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.

 o  pdus received with data field check block error

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

 o  pdus received with header block check error

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

 o  receive error thresholds reached

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

 o  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.

 o  remotely initiated state changes

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

 o  sdu octets received

    Number of data octets received from the remote station.

 o  sdu octets sent

    Number of data octets sent to the remote station.

 o  sdus received

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

 o  sdus sent

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

 o  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.

 o  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.

 o  send error thresholds reached

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

 o  strts received while in maintenance

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