I don't believe most classes have a different "burst dps" rotation. The closest thing is the opener.

Sustained dps in my opinion, by relevance, is your ability to maintain your optimal rotation/cooldown management throughout an encounter, while handling mechanics.

So you have a BRD who, for example can do 2k+ opener and that's your "burst dps"? he would end the fight with 1300, and that's sustained? I guess I'm not sure what the end goal is here, why do you ask?