High Definition Picture up to 4 Megapixel using standard coaxial cable and compatible SDI HD CCTV Cameras. SDI is a fully digital CCTV System, where signal from each and every Surveillance SDI Camera is sent back to the SDI DVR Unit via Standard Coaxial Cable. Signal is fully digital, not analog like with Regular CCTV Systems. Since every SDI Camera is connected directly to the SDI DVR, there are no issues with bandwidth like with IP Camera Systems. Full Real Time Video with 4 MP Resolution is available.

SDI Technology In simple words:

No new wiring required (we do recommend RG6 wiring on longer distances)
No networking knowledge
Easy installation and setup
Real Time Recording and Display Available
No Bandwidth Problems
No Expensive PoE Switches
1080p and 720p Resolution Available (up to 4 Megapixel)