BI compatible with my NVR

How I can set the buffer speed? I can't find it.
 
Location A: NVR with download speed is 25m and upload is 10m
Location B: BI donwload speed is 100m and upload is 25m.

There are not in the same location
 
I have another question. I have a DVR Everfocus in site C that doesn't support RTSP, but I can view the camera with http. Will I able to display in BI?