In the 1970s, the first CCTV analog system was introduced in the market.

In the 2000s, embedded DVR was invented and Dahua, as the pioneer in embedded technology, had lead the rapid technology shift.

In 2012, Dahua first introduced HDCVI (High Definition Composite Video Interface) technology, which brought the technological revolution over existing CCTV analog system and opened the new era of HD CCTV.

As the undisputed technology leader in HD CCTV, Dahua continuous investment in further technology evolution ensures the long term development and helps our customer to be one-step ahead of their competition.

HDCVI, as a standard HD video technology, offers the following main beniefits.

High Definition

HDCVI technology supports high resolution of 4 Megapixel/1080P/720P, and HDCVI 3.0 is first to bring 4 megapixel/UHD (4K) resolution into a system that uses coaxial cabling.

4 Signals over 1 Coaxial Cable

HDCVI technology supports 4 signals (audio, video, data and power) to be transmitted simultaneously over 1 coaxial cable.

HDCVI camera offers high resolution video, supports audio interface or built-in mic and communicates with HCVR through control signals. Moreover, POC module is available for integrated power-supply requirements. That’s why HDCVI camera is able to realize multiple signal in single cable and further simplifies the installation and deployment in the surveillance system.

Long Distance Transmission

HDCVI technology guarantees long-distance and real-time transmission without any signal loss. Based on real-scene test in Dahua’s test laboratory, it supports 1200m, 800m and 700m signal transmission for 720P, 1080P and 4MP respectively via RG6 coaxial cable, and 800m, 500m and 500m for 720P, 1080P and 4MP respectively via RG59 coaxial cable. With a CAT6 UTP cable, the transmission distance reaches up to 450m for 720P and 300m for 1080P and 4MP respectively.

Cable 720P 1080P 4MP
Coaxial Cable RG6 (75-5) 1200m 800m 700m
RG59 (75-3) 800m 500m 500m
UTP CAT6 450m 300m 300m

Seamless Upgrade

For customers who already applied analog surveillance system which no longer meets the requirement of HD video surveillance, it may be complicated, costly or even impossible to change the existing cabling to upgrade. HDCVI system can be seamlessly upgraded from traditional analog systems simply by replacing the old devices by HDCVI cameras and HCVRs, without changing the current environment, and at applicable labor and cost.


New HDCVI 3.0 technology is compatible with five major technologies available on the video market, and can unify multiple technologies into a single system. It is backwards compatible with existing standard definition analog systems, and systems can accept inputs from IP cameras. In addition, HDCVI 3.0 is compatible with competing HD-over-coax technologies HDTVI and AHD.

Easy to Use

It is the born feature of analog surveillance system to make everything easy to apply. HDCVI technology always keep in mind to bring the simplicity back to products and users. All HDCVI cameras and HCVRs can plug-and play, requiring no extra settings to realize HD video surveillance.


HDCVI makes coaxial video system also be intelligent. HDCVI 3.0 provides intelligent features such as face recognition, smart tracking, people counting/heat map, and smart scene adaption. Other intelligent features include intrusion, virtual tripwire, missing object, abandoned object and scene change. Capabilities also include defogging and voltage overload alarm.

Best Cost Performance

For establishing a reliable surveillance system, many factors may impact the cost. For example, running cable is a huge expense, and requirements of knowledgeable or skilled installers may also increase the labor cost. However, these concerns can be greatly eased on HDCVI surveillance system. HDCVI solutions always provide users with best cost performance. Actually, entry-level HDCVI products may be even more cost-effective than traditional analog devices.


HDCVI offers no-latency capability for real-time performance. There is no need for compression processing, so vivid, original-quality video images are provided. Especially for higher resolutions of 4 megapixel, HDCVI technology still supports 25/30fps real-time transmission.