cmcu - Thanks for posting your question on the forum!
Yes, this configuration can be done but it looks a little different than the Cisco configuration. Essentially, you will need to configure the PPP interface with the authentication and IP address information and then cross-connect this to the ethernet interface. You may find the following guide helpful: Configuring Ethernet Broadband Internet Access in AOS Integrated Switch_Router Products
This guide refers to integrated switch/router products but Option C on page 6 will apply to you. You will simply substitute VLAN interface for ETH interface instead and there won't be a need to map the VLAN interface to a port.
Please do not hesitate to let us know if you have any questions.
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