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Appendix E Wireless LANs

User’s Guide

256

several intermediate rate steps between the maximum and minimum data rates.

The IEEE 802.11g data rate and modulation are as follows:

IEEE 802.1x

In June 2001, the IEEE 802.1x standard was designed to extend the features of

IEEE 802.11 to support extended authentication as well as providing additional

accounting and control features. It is supported by Windows XP and a number of

network devices. Some advantages of IEEE 802.1x are:

• User based identification that allows for roaming.

• Support for RADIUS (Remote Authentication Dial In User Service, RFC 2138,

2139) for centralized user profile and accounting management on a network

RADIUS server.

• Support for EAP (Extensible Authentication Protocol, RFC 2486) that allows

additional authentication methods to be deployed with no changes to the access

point or the wireless stations.

RADIUS

RADIUS is based on a client-server model that supports authentication,

authorization and accounting. The access point is the client and the server is the

RADIUS server. The RADIUS server handles the following tasks:

• Authentication

Determines the identity of the users.

• Authorization

Determines the network services available to authenticated users once they are

connected to the network.

•Accounting

Keeps track of the client’s network activity.

RADIUS is a simple package exchange in which your AP acts as a message relay

between the wireless station and the network RADIUS server.

Table 81 IEEE 802.11g

DATA RATE

(MBPS)

MODULATION

1 DBPSK (Differential Binary Phase Shift Keyed)

2 DQPSK (Differential Quadrature Phase Shift Keying)

5.5 / 11 CCK (Complementary Code Keying)

6/9/12/18/24/36/

48/54

OFDM (Orthogonal Frequency Division Multiplexing)

1 2 ... 251 252 253 254 255 256 257 258 259 260 261 ... 279 280

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