Cisco Systems CB21AG manual GL-2

Glossary

B

bandwidth	Specifies the amount of the frequency spectrum that is usable for data transfer. It identifies the
	maximum data rate that a signal can attain on the medium without encountering significant power loss.
BPSK	Binary phase shift keying. A modulation technique used by IEEE 802.11-compliant wireless LANs for
	transmission at 1 Mbps.
broadcast key	A security feature for use with dynamic WEP keys. If your client adapter uses LEAP, EAP-FAST,
rotation	EAP-TLS, or PEAP authentication and you enable this feature, the access point changes the dynamic
	broadcast WEP key that it provides at the interval you select.

C

CCK	Complementary code keying. A modulation technique used by IEEE 802.11b-compliant wireless LANs
	for transmission at 5.5 and 11 Mbps.
CCKM	Cisco Centralized Key Management. Using CCKM, authenticated client devices can roam from one
	access point to another without any perceptible delay during reassociation. An access point on your
	network provides wireless domain services (WDS) and creates a cache of security credentials for
	CCKM-enabled client devices on the subnet. The WDS access point's cache of credentials dramatically
	reduces the time required for reassociation when a CCKM-enabled client device roams to a new access
	point.
CKIP	Cisco Key Integrity Protocol. Cisco’s WEP key permutation technique based on an early algorithm
	presented by the IEEE 802.11i security task group.
client	A radio device that uses the services of an access point to communicate wirelessly with other devices
	on a local area network.
CSMA	Carrier sense multiple access. A wireless LAN media access method specified by the IEEE 802.11
	specification.
CRC	Cyclic redundancy check. A method of checking for errors in a received packet.

D

data rates	The range of data transmission rates supported by a device. Data rates are measured in megabits per
	second (Mbps).
dBi	A ratio of decibels to an isotropic antenna that is commonly used to measure antenna gain. The greater
	the dBi value, the higher the gain and the more acute the angle of coverage.
DHCP	Dynamic Host Configuration Protocol. A protocol available with many operating systems that
	automatically issues IP addresses within a specified range to devices on the network. The device retains
	the assigned address for a specific administrator-defined period.

Cisco Aironet 802.11a/b/g Wireless LAN Client Adapters (CB21AG and PI21AG) Installation and Configuration Guide

GL-2 OL-4211-03