- What should be the sustained bandwidth I should plan for?
- What Layer 2 overhead does one assume for pppoATM?
- The VPN is a private IP network implemented over MPLS and therefore the core network would run over ATM?
PPPoA is defined in RFC 2364. Many DSL IADs support both methods:
RFC 2364 PPPoA VCMUX
RFC 2364 PPPoA LLC
A good reference for comparing the overhead of the different types of encapsulation is found here.
Another thing to consider is that the way that packets are divided up and inserted into the ATM cells can change the overhead.
A decent thread discussing overhead of protocols running over DSL can be found here.
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