It depends on both the resolution and frame rate. It also depends on the compression technology the IP camera is using. Below are three of the most popular compression technology and the required bandwidth and other important information.

Compression Protocol M-JPEG MPEG-2 MPEG-4

Compression Rate 6 30-40 200-500

Resolution 352 x 288 720 x 576 720 x 576

FPS 25-30 fps 50-60 fps 25-30 fps

Bandwidth Required 1.5Mbps 4-15Mbps 10K-1Mbps

Also, please note that 30 frames/s (NTSC) is the required frame rate to provide continuous motion and good quality (DVD like) video.