E1 is different Module with different encapsulation type than ATM. E1 is asynchronous serial interface and the encapsulation associated with it is PPP or HDLC.
atm on the other side has different type of interfaces that supports (E3, STM1 , STM4 , STM16 and STM10) capacity and the encapsulation type is totally different that what is used in serial interfaces like E1, the encapsulation type in ATM is a telco dependant but we usually have here (aal5snap).
I have checked the Module type supported on ISR 2911, however, atm modules are not supported on this series.
The short answer is that you cant have atm encapsulation type on the serial interface.
You might also confirm it with Cisco support just to confirm...
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