Proxim Harmony 802.11a Network Adapter 802.11a Installationsanleitung PDF herunterladen (Seite 119)

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).

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Proxim Harmony 802.11a Network Adapter 802.11a Installationsanleitung Seite 119