Monitoring an ATM port

Is it possible to span an ATM port? I have a Cisco 3825 which acts as one of our many edge routers. I would like to monitor the the OC3 we have coming into this router, but 'monitor session 1 source interface atm1/0' is not an option.

IOS = (C3825-ADVENTERPRISEK9-M), Version 12.4(9)T4