For some reason, w_scan isn't working for my Terratec Cinergy C HD PCI. I had some trouble finding initial scan data. But finally I found a list that gives me all channels for Canal Digital cable in Trondheim.
# no-trondheim-CanalDigital (cable)
C 290000000 6950000 NONE QAM256
C 298000000 6950000 NONE QAM256
C 306000000 6950000 NONE QAM64
C 314000000 6950000 NONE QAM64
C 322000000 6950000 NONE QAM64
C 346000000 6950000 NONE QAM64
C 354000000 6950000 NONE QAM64
C 362000000 6950000 NONE QAM64
C 370000000 6950000 NONE QAM64
C 378000000 6950000 NONE QAM64
C 386000000 6950000 NONE QAM64
C 394000000 6950000 NONE QAM64
C 402000000 6950000 NONE QAM64
C 410000000 6950000 NONE QAM256
C 418000000 6950000 NONE QAM64
C 426000000 6950000 NONE QAM64
C 434000000 6950000 NONE QAM64
C 450000000 6950000 NONE QAM64
C 458000000 6950000 NONE QAM64
C 474000000 6950000 NONE QAM64
C 490000000 6950000 NONE QAM256
C 610000000 6950000 NONE QAM64
Taken from: http://mspc.no/forum/showthread.php?tid=612