So this is an interesting feature. Essentially Universal port is "automated edge port provisioning". The following triggers can be used: Time of Day, user authentication, device authentication, identity management, Event Management Systems (EMS).
Profiles are configured on ports, either locally on the switch, or administered by Ridgeline (Extreme Network Management Software) and activated on the triggers.
XOS supports 3 types of authentication: MAC address based, Web based (username and password), or 802.1x.
Examples of universal port in action are:
Shutting down Phones or other services out of working hours - E.G. 7pm till 7am phones and wireless services power off.
Automatic port parameters provisioning - provisioning of VLANs, QoS, etc for users. This is
great for mobile users too who keep moving ports as their settings go with them.
Broadcast control - If a port detects broadcast traffic, genuine or malformed from a bad NIC, the port can be shut down or rate limited.
This seems like a useful simple little feature and it's mostly self explanatory. Extreme claims you can write the scripts in most languages as well so theoretically easy to implement with loads of possibilities.
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