The Install Guide mentions Ethernet only:
Under Hardware Requirements, it says:
Ethernet controllers
In addition to the built-in public Ethernet controller, VCS requires at least one more Ethernet interface per system. Symantec recommends two additional interfaces.
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To set up the hardware
Connect the Storage Foundation private Ethernet controllers.
Perform the following tasks as necessary:
■ When you add nodes to a two-node cluster, use independent switches or hubs for the private network connections. You can only use crossover cables for a two-node cluster, so you might have to swap out the cable for a switch or hub.
■ If you already use independent hubs, connect the two Ethernet controllers on the new node to the independent hubs.