Oscam and cache levels

Hi ,

Can any one please explain what the cache1,cache2 and cache3 that appears in the oscam log really means ?

I found this on the internet :

Quote

cache1: ECM and CW in cache already.

cache2: ECM and checksum in cache already

and this :

Quote

cache2 just means that a second request for the same channel has been served by oscams cache rather than your card.

I feel like there is a conflict in these info , so i would like to know what they really mean .

Regards