EXPERT RESPONSE
To determine the sustained bandwidth you should look at the calling pattern between the various sites. If you say the data will be constant at about 128 kb/s, then the bandwidth required will depend upon the number of simultaneous calls you expect to have.
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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