Unfortunately, that is the case with digital CCTV right across the market. High resolutions chew away at bandwidth at an alarming rate. Our product does have a "bandwidth throttle" though, which allows you to alter the bit rate of the video being sent, so you still have a real-time video, at a reduced resolution, and at slightly lower bandwidth usage. This will let you adequately view one camera at a time , but 16 is a bit much
16-24 cameras over LAN is, however, a reality and we currently have existing installations on such an application.