zdfvision

Does anyone know, what e.g. a channel-number 55.28006 (qam64) means? My cable-provider just tells me, that e.g. on channel S32 (394 MHz) there should be the bouquet "ZDFVision" (5 channels). But win7 tells me, that ZDFVision is at 55.28006. What does this mean? The problem is, that some...