Cisco Systems CB21AG manual GL-5

P

PAC

packet

Q

QoS

QPSK

Glossary

Protected access credentials. Credentials that are either automatically or manually provisioned and used to perform mutual authentication with the RADIUS server during EAP-FAST authentication. PACs are created by the Cisco Secure ACS server and are identified by an ID. The user obtains his or her own copy of the PAC from the server, and the ID links the PAC to the profile created in ADU. When manual PAC provisioning is enabled, the PAC file is manually copied from the server and imported onto the client device.

A basic message unit for communication across a network. A packet usually includes routing information, data, and sometimes error detection information.

Quality of service. QoS on wireless LANs provides prioritization of traffic from the access point over the WLAN based on traffic classification. The benefits of QoS become more obvious as the load on the wireless LAN increases, keeping the latency, jitter, and loss for selected traffic types within an acceptable range.

Quadruple phase shift keying. A modulation technique used by IEEE 802.11-compliant wireless LANs for transmission at 2 Mbps.

R

radio channel

range

receiver sensitivity

RF

roaming

The frequency at which a radio operates.

A linear measure of the distance that a transmitter can send a signal.

A measurement of the weakest signal a receiver can receive and still correctly translate it into data.

Radio frequency. A generic term for radio-based technology.

A feature of some access points that enables users to move through a facility while maintaining an unbroken connection to the LAN.

RTS threshold The packet size at which an access point issues a request to send (RTS) before sending the packet.

S

spread spectrum	A radio transmission technology that spreads data over a much wider bandwidth than otherwise
	required in order to gain benefits such as improved interference tolerance and unlicensed operation.
SSID	Service set identifier. A unique identifier that stations must use to be able to communicate with an
	access point. The SSID can be any alphanumeric entry up to a maximum of 32 characters.

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

OL-4211-03 GL-5