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Do You Really Know SDI(Serial Digital Interface) in These Aspects?

Maybe most of people have a knowledge of SDI(Serial Digital Interface), but when it really comes into it, how many people are there indeed familiar with it? Then today, Gigalight will make a comprehensive introduction to you about it in these aspects.

What is SDI?

SDI (Serial Digital Interface) is a digital video interface standard made by SMPTE organization. This serial interface transmits every bit of data word and corresponding data through single channel. Due to the high data rate of serial digital signal (a kind of digital baseband signal), it must be processed before transmission.

What Are the Main Types of SDI Video Optical Transceiver?

SDI video SFP optical transceiver can be divided into various types according to different factors. For example, according to operating wavelength, they can be classified into 1310nm, 1490nm, 1550nm and CWDM wavelengths video SFP transceivers; according to operating rate, they can usually be divided into 3G-SDI, 6G-SDI and 12G-SDI video SFP transceiver.

What Are the SDI Digital Video Matrix and Its Main Functions?

The digital video matrix refers to that the m channel video signal is transmitted into the electronic device on the n channel monitoring device via array convention. In addition, it is also available to achieve the video switching via the digital cross-point chip, and to achieve the channel shift mainly by the manual mode to plug copper shaft connector of the wiring frame before the digital video matrix appears. At present, the digital matrix is distinguished in the work bandwidth. For example, for the device that can support 3G-SDI high-speed signal, the automatic balancing function can usually be achieved in both input and output terminal of each channel; the high-end device is with CDR clock regeneration function; the form of interface is with BNC copper shaft interface; it also supports the optic fiber interface of video SFP slot, also adopts the modular design, and flexible in the configuration. After that, it is more convenient for users to use.

What Is the Difference Between HDMI and SDI Optical Transceiver?

Different in the Transmission Mode: HDMI is with the parallel transmission mode, the quantity of cables reaches up to 19 pairs; while SDI is with serial transmission mode, the quantity of cables is one pair.

Distinguished in Applications: HDMI is for application of consumption products, such as consumption-grade camera, game box, high-definition TV, and other digital video output; while SDI is for broadcast market, is applied in the TV station and studio, and so on. HDMI interface supports HDCP encryption to protect HD digital copyright, while SDI does not support it.

What Does the Speed Rate of SDI Include?

Standards Types Speed Rate
SMPTE 259M SD-SDI 270Mbit/s, 360Mbit/s, 143Mbit/s, 177Mbit/s
SMPTE 344M ED-SDI 540Mbit/s
SMPTE 292M HD-SDI 1.485Gbit/s, 1.485/1.001Gbit/s
SMPTE 372M Dual link HD-SDI 2.970Gbit/s, 2.970/1.001Gbit/s
SMPTE 424M 3G-SDI 2.970Gbit/s, 2.970/1.001Gbit/s
SMPTE ST-2081 6G-SDI 6 Gbit/s
SMPTE ST-2082 12G-SDI 12 Gbit/s


Above is a comprehensive introduction to SDI. Hoping this post can help you have a better knowledge of it so that it will be beneficial to the applications of related products. If you want to know more information about it or others, Gigalight official website( is a good choice for you.

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