line protocol for atm sub interface

Hi,

I wanted to know if we would get a valid value for line protocol for
atm sub interfaces. Which OID would I have to use to get the line
protocol for atm subinterface.
Like for interface we use locIfLineProt object to get the line
protocol of the interface. However this is not valid for sub
interface.
It would be great if you could tell which object would refer to line
protocol of the atm sub interface.

Thanks in advance.

Regards,
Smitha

.