PPPoA on SSG140

Hello,

I would appreciate it if someone could assist me with this.

I need to set up a PPPoA (not E) connection on an interface on a SSG140. The problem is, the drop down for which interface to bind to has only one option: None. When I try the same using PPOoE (not A) the interfaces are listed in the drop down. The problem is, this needs to be a PPPoA connection.

Is this possible with the SSG140 and if so, how do I get the interface to bind to to appear in the list? I am only using the GUI.

Thanks,
Paul