[vdr] Dumb question on DVB-C

Hi.

I'm currently using a Nova-T card for terrestrial DVB, but would like to add a DVB-C card and connect to cable.

Am I right in assuming that channels on cable are organised much like on terrestrial, with 3 or 4 transponder frequencies carrying 3 or 4 channels each? I wonder, because as the cable is provided by a single supplier, I wasn't sure how the channels are mapped.

Secondly, are channels that require CAM decrypting all generally on the same transponder? Or are these pay-channels interspersed with the free- to-air ones across the frequencies?

Thanks