User Manual

7-13
Cisco Aironet Wireless LAN Client Adapters Installation and Configuration Guide for Windows
OL-1394-06
Chapter 7 Performing Diagnostics
Viewing Statistics for Your Client Adapter
Overrun Errors The number of packets received when no receive buffers were
available. These errors usually occur when the host does not read
the received packets from the client adapter fast enough.
PLCP CRC Errors The number of times the client adapter started to receive an
802.11 physical layer convergence protocol (PLCP) header but
the rest of the packet was ignored due to a cyclic redundancy
check (CRC) error in the header.
Note CRC errors can be attributed to packet collisions caused
by a dense population of client adapters, overlapping
access point coverage on a channel, high multipath
conditions from bounced signals, or the presence of other
2.4-GHz signals from devices such as microwave ovens,
wireless handset phones, etc.
PLCP Format Errors The number of times an 802.11 PLCP header was received with a
valid CRC but the rest of the packet was ignored due to an
unknown value in the header.
PLCP Length Errors The number of times an 802.11 PLCP header was received but the
rest of the packet was ignored due to an illegal header length.
MAC CRC Errors The number of packets that had a valid 802.11 PLCP header but
contained a CRC error in the data portion of the packet.
Note CRC errors can be attributed to packet collisions caused
by a dense population of client adapters, overlapping
access point coverage on a channel, high multipath
conditions from bounced signals, or the presence of other
2.4-GHz signals from devices such as microwave ovens,
wireless handset phones, etc.
Partial Packets Received The number of fragments that were discarded because the entire
packet was not received successfully.
SSID Mismatches The number of times the client adapter tried to associate to an
access point but was unable to because the adapter’s SSID was not
the same as the access point’s.
AP Mismatches The number of times the client adapter tried to associate to an
access point but was unable to because the access point was not
the adapter’s specified access point.
Note Refer to the Specified Access Point 1- 4 parameter in
Table 5-4 for information on specifying access points.
Data Rate Mismatches The number of times the client adapter tried to associate to an
access point but was unable to because the adapter’s data rate was
not supported by the access point.
Note Refer to the Data Rate parameter in Table 5-3 for
information on supported data rates.
Authentication Rejects The number of times the client adapter tried to authenticate to an
access point but was rejected.
Table 7-4 Client Adapter Statistics (continued)
Statistic Description