Cisco 340 - Manual (Page 12)

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Cisco Aironet 340, 350, and CB20A Wireless LAN Client Adapters Installation and Configuration Guide for Windows
OL-1394-08
Chapter 5 Configuring the Client Adapter
Setting RF Network Parameters
Clear Channel Assessment Specifies the method that determines whether the channel on which
your client adapter will operate is clear prior to the transmission of
data.
Options: Firmware Default (XXX), Carrier/Correlation (Car/Cor),
Energy Detect (ED), or ED or Car/Cor
Default: Firmware Default (XXX)
Method Description
Firmware Default (XXX) The Clear Channel Assessment (CCA)
mechanism will report that the channel is
busy based on the default value of the
client adapter’s firmware. The firmware’s
CCA default value is shown in
parentheses.
Note The CCA default value for PCM,
LMC, and PCI card firmware is
Car/Cor; the default value for mini
PCI card firmware is ED.
Carrier/Correlation
(Car/Cor) The CCA mechanism will report that the
channel is busy upon detection of a
direct-sequence spread spectrum (DSSS)
signal. This signal may be above or below
the ED threshold.
Energy Detect (ED) The CCA mechanism will report that the
channel is busy upon detection of any
energy above the ED threshold.
ED or Car/Cor The CCA mechanism will report that the
channel is busy upon detection of a DSSS
signal or any energy above the ED
threshold.
Note This parameter is available only for 2.4-GHz client adapters.
Table 5-3 RF Network Parameters (continued)
Parameter Description