Installation guide

Wireless Guide 105
Advanced Features for Wireless Analysis
Table 10-2. Detail Error Counters in the Dashboard’s Detail Tab
Counter Description
PLCPs The number of PLCP errors seen on the
network. PLCP errors occur when a wireless
station receives a Physical Layer Convergence
Protocol header with an invalid checksum.
Before frames are sent between wireless
stations, the physical layer (PHY) sends a PLCP
header to a receiving station to negotiate the
size of the frames to be sent, the speed at which
they should be sent, and so on. This PLCP
header includes a checksum which the
receiving station uses to validate that the
received PLCP header is not corrupt. If this
checksum is corrupt, it is considered a PLCP
error.
WEP ICVs The number of packets sent indicating an invalid
WEP ICV. The Wired Equivalent Policy (WEP)
is used to encrypt data sent between stations on
the wireless network. When two stations
exchange WEP-encrypted data, they go through
an authentication sequence wherein challenge
messages are encrypted and decrypted by
sender and receiver. If an Integrity Check Value
does not match between sender and receiver,
the receiver indicates a communications failure
(that is, an invalid WEP ICV).