In November 2012, Dahua technology released analog high-definition transmission interface technology-HDCVI（High Definition Composite Video Interface）, with self-owned intellectual property right. HDCVI technology is a HD video transmission method, based on existing RG-59 or RG-6 coaxial cable. It can achieve long distance HD video signal reliable transmission at low cost via low general coaxial cable. In the practical application, HD-SDI subsystem requires high transmission medium, while HDCVI is suitable to the long distance, low cost transmission medium and complex deployment situation.