Appendix B Wireless LANs
EMG6726/8726-B10A User’s Guide
290
If the
Fragmentation Threshold
value is smaller than the
RTS/CTS
value (see previously) you set then the
RTS (Request To Send)/CTS (Clear to Send) handshake will never occur as data frames will be
fragmented before they reach
RTS/CTS
size.
IEEE 802.11g Wireless LAN
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:
Wireless Security Overview
Wireless security is vital to your network to protect wireless communication between wireless clients,
access points and the wired network.
Wireless security methods available on the EMG are data encryption, wireless client authentication,
restricting access by device MAC address and hiding the EMG identity.
The following figure shows the relative effectiveness of these wireless security methods available on your
EMG.
Note: You must enable the same wireless security settings on the EMG and on all wireless
clients that you want to associate with it.
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.
Table 132 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)
Table 133 Wireless Security Levels
SECURITY
LEVEL
SECURITY TYPE
Least
Secure
Most Secure
Unique SSID (Default)
Unique SSID with Hide SSID Enabled
MAC Address Filtering
