Allied Telesis AT-WA7501 - Manual (Page 206)

Chapter 6: Configuring Security
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Table 7. WPA 802.1x Security Parameter Descriptions
Parameter Explanation
Multicast
Encryption Type Allows you to select the data encryption method
for broadcast and multicast for this radio port. A
station connected to this port may not select a
weaker encryption method to exchange unicast
frames.
Key Rotation
Period (Minutes) Allows you to specify the key rotation policy for
encryption keys when using WEP in 802.1x and
for TKIP group keys when using WPA. The value
represents key duration in minutes. The default
value is 5 minutes.