Need some info about DOCSIS!

Can a Motorola sb5100 DOCSIS2.0 modem work on an ISP that uses DOCSIS3.0?
reason why i ask On my cc modem page this is what I see, STATUS->RF PARAMETERS->UPSTREAM->CHANNEL TYPE-> DOCSIS2.0 (ATDMA) then when I go over to HW/FW VERSIONS-> HARDWARE INFORMATION im seeing ARRIS DOCSIS 3.0 Touchstone WideBand Cable Modem,so I don’t know if my cc is using DOCSIS2.0 or DOCSIS3.0 or is it that the arris CM820 is just DOCSIS3.0 and there network is really DOCSIS2.0 .can you please shed some light on this please.