Enterasys Networks 802.11 - Manual (Page 159)

7-13
Showing Counters
Single collision Number of successfully transmitted frames on the selected interface for which
transmission is inhibited by exactly one collision. Frames counted in this counter
are not counted by the MultipleCollisionFrames counter.
Multiple collisions Number of successfully transmitted frames on the selected interface for which
transmission is inhibited by more than one collision. Frames counted in this
counter are not counted by the SingleCollisionFrames counter.
Excessive collisions Number of frames for which transmission on the selected interface fails due to
excessive collisions.
Carrier check failed Number of times that the carrier sense condition was lost or never asserted when
attempting to transmit a frame on the selected interface. The count is incremented
at most once per transmission attempt, even if the carrier sense condition
fluctuates during a transmission attempt.
Transmit Frame too
long Total number of times the interface failed to transmit frames due to a frame being
larger than the maximum frame size of 1518 bytes.
Remote failure to
defer Number of frames for which the first transmission attempt on the selected
interface is delayed because the medium is busy. The count does not include
frames involved in collisions.
Block check error Number of frames received on the selected interface that are not an integral
number of octets in length and do not pass the FCS check. The count is
incremented when the alignmentError status is returned by the MAC service to the
LLC (or other MAC user).
Frame error Number of times messages were received while a transmission elsewhere in the
network was in progress. This counter is expected to be zero. Non-zero-values
indicate a heavily loaded system.
Receive Frame too
long Total number of times the interface received a frame that was larger than the
maximum frame size of 1518 bytes.
Data Overrun The total number of frames which contain data overrun errors.
System buffer
unavailable Total number of times the interface failed to have a system receive buffer
available to store an incoming frame. These failures can occur during a broadcast
storm or bursts of frames destined for the interface.
Collision detect check
fail This counter is not used on the wired interface.
For the wireless interface, the number of times a received message was discarded
because it could not be decrypted by the PC Card. This means that:
• Both devices have enabled encryption, but use keys that do not match.
• One of the devices does not support encryption or does not have encryption
enabled.
Table 7-9: RoamAbout AP (Classic and 2000) Counters (Cont’d)
Counter Description