Avaya AP-4 User Manual page 220

Security
Different servers support different EAP types and each EAP type provides
different features. Refer to the documentation that came with your
RADIUS server to determine which EAP types it supports.
NOTE:
The AP supports the following EAP types when Authentication
Mode is set to 802.1x or WPA: EAP-TLS, PEAP, and EAP-TTLS.
When Authentication Mode is set to Mixed, the AP supports the
following EAP types: EAP-TLS, PEAP, EAP-TLLS, and EAP-MD5
(MD5 does not support automatic key distribution; therefore, if you
choose this method you need to manually configure each client with
the network's encryption key).
Authentication Process
There are three main components in the authentication process. The
standard refers to them as:
1. supplicant (client PC)
2. authenticator (Access Point)
3. authentication server (RADIUS server)
When using Authentication Mode is set to 802.1x, WPA, or Mixed mode
(802.1x and WEP), you need to configure your RADIUS server for
authentication purposes.
4-122 Avaya Wireless AP-4/5/6 User's Guide