ZyXEL Access Point G1000 v2 91-005-124001B Manual Do Utilizador

ZyXEL G-1000 v2 User’s Guide

173

As wireless networks become popular for both portable computing and corporate networks, 
security is now a priority. 

IEEE 802.11g is fully compatible with the IEEE 802.11b standard. This means an IEEE 
802.11b adapter can interface directly with an IEEE 802.11g access point (and vice versa) at 
11 Mbps or lower depending on range. IEEE 802.11g has several intermediate rate steps 
between the maximum and minimum data rates. The IEEE 802.11g data rate and modulation 
are as follows:

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. 

Table 84   IEEE 802.11g

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)