Hello @akrammeraki an MV21 is 720p and at enhanced quality and 15 frames/sec, it should put a bit less than 800Kbps onto the network if you are actively viewing video from that camera. But when you're not viewing video, all storage and analytics happen on the camera and only things like motion indexing information and Dashboard communications should amount to 1 or 2Kbps on an MV21, as mentioned in the other posts referenced.
Hope that helps!