Appendix A Wireless LANs
WAP6807 User’s Guide
101
WPA(2)-PSK Application Example
A WPA(2)-PSK application looks as follows.
1 First enter identical passwords into the AP and all wireless clients. The Pre-Shared Key (PSK) must consist
of between 8 and 63 ASCII characters or 64 hexadecimal characters (including spaces and symbols).
2 The AP checks each wireless client's password and allows it to join the network only if the password
matches.
3 The AP and wireless clients generate a common PMK (Pairwise Master Key). The key itself is not sent over
the network, but is derived from the PSK and the SSID.
4 The AP and wireless clients use the TKIP or AES encryption process, the PMK and information exchanged
in a handshake to create temporal encryption keys. They use these keys to encrypt data exchanged
between them.
Figure 61 WPA(2)-PSK Authentication
Antenna Overview
An antenna couples RF signals onto air. A transmitter within a wireless device sends an RF signal to the
antenna, which propagates the signal through the air. The antenna also operates in reverse by
capturing RF signals from the air.
Positioning the antennas properly increases the range and coverage area of a wireless LAN.
Antenna Characteristics
Frequency
An antenna in the frequency of 2.4GHz or 5GHz is needed to communicate efficiently in a wireless LAN
Radiation Pattern
A radiation pattern is a diagram that allows you to visualize the shape of the antenna’s coverage area.
To Next Page
Loading...
