What are SG-SDI and HD-SDI?

First, we need to understand what SDI is. The so-called SDI, the English name is SerialDigitalInterface, it is actually an interface type, that is, a digital serial interface.

The SDI interface can be roughly divided into three types: SD-SDI (270Mbp, SMPTE259M), HD-SDI (1.485Gbps, SMPTE292M), 3G-SDI (2.97Gbps, SMPTE424M). From this division standard, it can be seen that the rate is an important index.

HD-SDI stands for High Definition Digital Component Serial Interface. HD-SDI is a real-time uncompressed high-definition radio and television camera, which is another technological advancement in the field of security monitoring, providing high-definition image sources for monitoring centers. The HD-SDI camera is a high-definition real-time camera that transmits uncompressed digital video through a 75-ohm coaxial cable based on the SMPTE (Society of Motion Picture and Television Engineers) serial link standard.

3G-SDI signal has been widely used in the radio and television industry. With the continuous development of the security industry, its advantages of high-speed uncompressed digital are gradually being tapped. At present, a large number of 3G-SDI series products have been launched on the market, including SDI conversion equipment. , SDI digital switching matrix equipment and SDI distributor. These devices all use 3G signals, and are also compatible with 1.5G signals for long-distance transmission to meet the diverse needs of users.

So, what is the specific difference between 3G-SDI and HD-SDI?

The design and production of HD-SDI optical transceiver is a highly reliable and high-performance serial digital optical transmission equipment suitable for the TV industry. The signal format ranges from 19.4Mbps to 1.485Gbps. (EN50083-9) and other digital TV formats to meet the requirements of industrial-grade products. 3G-SDI ultra-high-definition digital video optical transceiver is an upgraded version of HD-SDI optical transceiver, the signal format is from 19.4Mbps to 2.97Gbps, the system supports SMPTE424M, SMPTE292M, SMPTE259M, SMPTE297M, SMPTE305M, SMPTE310M standards, and DVB-ASI (EN50083-9) and other digital TV formats.

With the advent of high-definition (HD) video standards such as 1080i and 720P, the interface was adapted to handle the higher 1.485Gbps data rate. The 1.485-Gbps serial interface is often referred to as the HD-SDI interface, as defined by the SMPTE292M , it uses the same 75 ohm coaxial cable. SMPTE ratified a new standard called SMPTE424M, which doubles the SDI data rate to 2.97Gbps on the same 75-ohm coaxial cable. This new standard, also known as 3-Gbps (3G) SDI, supports higher resolution image quality such as 1080P and digital cinema. At present, the digital product with the highest speed is 7K-SDI.