This has noting to do with OCAP. The channel mapping is handled during the set-up process.  WMC detects the InfiniTV card, you tell it your zip and who your cable operator is, if there are multiple operators to choose from in your area then WMC presents the list for you to select, and off you go.

 

A cable operator could write an OCAP application for WMC to take advantage of the Ceton InfiniTV tuners but none are avaialble at this point.