decrypt 2 different encrypted channels on 2 different transponders??

Am I right that it won't be possible to use 2 different encrypted
channels on 2 different transponders with 1 CAM?

I think TV tuner CI technology allows only to support 1 transponder at the same
time, right?
So If i want to record 1 channel on transponder "a" and see an
other channel on transponder "b" from same provider, the customer needs
2 CAM's and 2 smartcards from this provider? This is correct? I'm not
sure because somebody told me about a technology which allows to decode
several transponders with 1 CAM and I don't know if the TBS 5980 supports
this technology.