ADSL WIC using COS or QOS

I'm kind of new at this so forgive me if this is a stupid question. I've got a Cisco 1841 router with a ADSL over POTS WIC as the WAN interface. I need to setup a IP QOS policy on it but although the spec's page says that it supports IP QOS I can't apply a policy to it. It makes sense since service based QOS is a layer 3 thing and the ADSL uses layer 2 based ATM. Anyways, I know there has to be a way to set priorities on traffic based on their source or destination ports I just can't figure out how to do it. I've seen some reference to COS with ATM but can't find any examples. Does anyone know how to do this?

FYI, this is my first Usenet post so hopefully I did this right.

-Paul

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Paul
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