HD-SDIHD-SDI CCTV Technology
Commonly referred to as: HD-SDI, HD SDI, SDI, SDI HD
High-definition Serial Digital Interface (HD-SDI) was the first HD Analog format introduced to the video security market. HD-SDI solutions are capable of transmitting 720p or 1080p resolution video over standard coaxial cable.
HD-SDI recorders are compatible with like-branded HD-SDI cameras and limited analog models, in limited configurations. HD-SDI offers comparable resolution to other HD CCTV formats, and arguably produces the highest quality image.
However, the technology is only capable of shorter video transmission distances, and is limited in both camera compatibility and configurability. Additionally, a slower adaption rate of the technology has resulted in significantly higher prices for HD‑SDI products.
- What You Need to Know:HD-SDI offers a better picture quality, but this benefit seems to be outweighed by performance and compatibility limitations and higher prices.
| HD-SDI Capabilities |
| Max Resolution |
1080p |
| Transmission Distance |
Coaxial Cable (RG59) |
492’ |
| Twisted Pair (CAT5) |
350’ |
| DVR Input Compatibility |
Analog |
Limited models, on limited channels, in limited configurations |
| HD |
Like-branded HD-SDI cameras, on any channel, in any configuration |
| IP |
N/A |
| Standard Protocol(s) |
SMPTE 292M |
HD-SDI Features & Benefits
- Supports up to 960H Analog, 720p and 1080p HD-SDI cameras
- Transmits with zero latency over standard coax cabling (smooth motion)
- Backwards compatible with select analog cameras and standard coaxial cabling
- Features digital zoom capabilities in both live and playback mode
- Hybrid recorder accepts select standard definition analog (CIF-960H), and like-branded HD-SDI (720p & 1080p) cameras, in limited configurations
HD-SDI Limitations
- Currently limited to 1080p full HD resolution
- Transmission distance limited to 492’ (Coax) and 350’ (CAT5)
- Only compatible with select analog cameras, and like-branded HD-SDI cameras
- DVR hybrid configurations limited
- Does not support IP cameras
- Higher street price vs. alternative HD options
Comparison: HD-SDI vs. Other HD Analog Formats
- Comparable resolutions, higher image quality
- Shortest transmission distances vs. all HD alternatives
- Limited compatibility w/ analog & HD cameras (similar to HD-CVI and AHD, inferior to HD-TVI)
- Limited flexibility for DVR channel configurations (similar to HD-CVI and AHD, inferior to HD-TVI)
- No IP camera support (similar to HD-CVI and AHD, inferior to HD-TVI)
