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May 30, 2018
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It is known that SDI interfaces can be roughly divided into three types: SD-SDI (270Mbp, SMPTE259M), HD-SDI (1.485Gbps, SMPTE292M) and 3G-SDI (2.97Gbps, SMPTE424M). It is seen from these standards of division that the rate is an important index. For HD-SDI and 3G-SDI, as the commonly-used two types in radio and television industry, maybe there are still many people unfamiliar with them and what difference between them. Then in this article, there will be an introduction to the difference between HD-SDI and 3G-SDI.
Before the introduction to HD-SDI and 3G-SDI, to understand them better, it will be better to know what SDI is. 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 Is 3G-SDI?
3G-SDI has been widely used in the radio and TV industry. With the continuous development of the security industry, its advantages, high speed and without digital uncompressed, are gradually found. At present, a large number of 3G-SDI series products have been introduced in the market, including SDI conversion equipment, SDI digital switching matrix equipment and SDI distributor. These devices use 3G signals, and can also be compatible with 1.5G signals for long-distance transmission to meet the diverse needs of users.
What Is HD-SDI?
HD-SDI is a high-definition digital component serial interface. HD-SDI is high-definition radio and television camera which is real-time and uncompressed. It is another scientific and technological progress in the security monitoring field. It provides a high-definition image source for the monitoring center. The HD-SDI camera, based on the serial link standard of the SMPTE (film and television Engineer Association), is a high-definition and real-time video camera that transmits uncompressed digital video through 75 ohm coaxial cables.
What Is the Difference Between 3G-SDI and HD-SDI
The design and production of HD-SDI optical terminal equipment is suitable for serial digital optical transmission equipment with high reliability and high performance in the TV industry. The signal format is from 19.4Mbps to 1.485Gbps, and the system supports the signals with digital TV formats such as SMPTE292, SMPTE259M, SMPTE297M, SMPTE305M, SMPTE310M and DVB-ASI (EN50083–9), so as to satisfy the requirements of industrial products. 3G-SDI digital video optical terminal device with ultra high definition is an upgraded version of the HD-SDI optical terminal device. The signal format is from 19.4Mbps to 2.97Gbps, and the system is accorded with the signal of digital TV formats such as SMPTE424M, SMPTE292M, SMPTE259M, SMPTE297M, SMPTE305M, SMPTE310M, DVB-ASI (EN50083–9) and so on.
With the emergence of standard about high-definition(HD) video standards such as 1080i and 720P, the interface is adjusted to process higher data rate(1.485Gbps). The 1.485Gbps serial interface is usually called as HD-SDI interface, defined by SMPTE292M, and uses the same 75 ohm coaxial cable. SMPTE approves a new standard called as SMPTE424M, which doubles the SDI data rate to 2.97Gbps on the same 75 ohm coaxial cable. This new standard is also called 3-Gbps (3G) SDI, which supports higher-resolution image quality such as 1080P and digital cinema. At present, the highest rate of digital products is 7K-SDI.
Above all is about the difference between HD-SDI and 3G-SDI. For SDI series products, Gigalight currently has 3G-SDI SFP, 6G-SDI SFP+, 12G-SDI SFP+ optical transceiver. If you want to know more details, welcome to visit Gigalight official website.
About Gigalight:
Gigalight is a design innovator in global optical interconnect field. A series of optical interconnect products include: optical transceivers, passive optical components, active optical cables, GIGAC MTP/MPO cabling, cloud programmers & checkers, etc. Three applications are mainly covered: Data Center & Cloud Computing, MAN & Broadcast Video, and Mobile Network & 5G Optical Transmission. Gigalight takes advantage of its exclusive design to provide clients with one-stop optical network devices and cost-effective products.
Serial Digital Interface (SDI) is a video transmission standard. It works over coaxial cables. This standard is popular in professional broadcasting for its reliability and scalability nature. SDI comes in different versions. They include HD-SDI, 3G-SDI, 6G-SDI, 12G-SDI, and 24G-SDI. These versions cater to increasing demands for better video resolution and frame rates.
Each SDI version is backward compatible with earlier ones. Therefore, integrating new equipment into existing SDI structures is easy. However, video transmission quality is dictated by the lowest SDI version in the signal chain. Upgrading to higher SDI versions can greatly improve video quality and performance.
SDI is a professional broadcasting industry standard. It transmits high-quality and uncompressed digital video over coaxial cables. Several versions of SDI signals are available. These include HD-SDI, 3G-SDI, 6G-SDI, 12G-SDI, and 24G-SDI. Each version supports different video resolution levels and data transfer rates. This makes them suitable for a variety of applications.
Do you want to know how HD-SDI, 3G-SDI, 6G-SDI, 12G-SDI, and 24G-SDI variants differ?
This blog post will compare these SDI types. Let’s explore this topic further.
SDI, or Serial Digital Interface, is a type of digital signal. It is used for transmitting high-quality, uncompressed video data. The broadcasting industry widely uses SDI connections due to its reliability and scalability.
SDI support ensures the transmission of video over coaxial cables. It’s standard in professional broadcasting and comes in different versions. These are:
These versions cater to various application needs. They support different video resolution levels and data transfer rates. Each version is backward compatible, allowing for seamless integration of new equipment into existing infrastructures. However, video quality depends on the lowest SDI version in the signal chain.
Let’s explore the various types of SDI signals:
SD-SDI is a trusted SDI variation. Its full name is Standard Definition Serial Digital Interface. Its standard is SMPTE 259M.
The system originated in 1989. This makes it one of the earliest SDI versions. But that doesn’t make it redundant.
SD-SDI supports various bitrates. These are 270, 360, 143, and 177 Mbit/s. The variety allows it to handle different video quality levels.
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In terms of example video formats, SD-SDI supports 480i and 576i. These formats are standard definition. This means they are suitable for basic broadcast applications.
ED-SDI is another SDI version. It is short for Extended Definition Serial Digital Interface. Its standard is SMPTE 344M.
ED-SDI entered the scene in 2000. It brought better quality to digital video interfaces.
This version stands out with its bitrate. It supports 540 Mbit/s. This makes the transmission of richer video signals possible.
Additionally, ED-SDI handles specific video formats. These are 480p and 576p. Both offer extended definition video. This enhances pictures sent via an SDI cable.
HD-SDI stands for High Definition Serial Digital Interface. Its standard is SMPTE 292M, which was launched in 1998.
HD Serial Digital Interface supports two bitrates. These are 1485 Mbit/s and 1485/1.001 Mbit/s. That’s significantly higher than what its predecessors offered.
Such high bitrates ensure quality transmission. They maintain fidelity while sending the video signal via a coaxial cable.
The formats it supports are 720p and 1080i. These formats are high-resolution. This adds greater definition to the video data.
HD-SDI revolutionized the industry. It brought the concept of a high-definition serial digital interface to life.
Dual Link HD-SDI is an evolution in the SDI arena. It is both unique and powerful. Its standard is SMPTE 372M.
The system’s introduction was in 2002. It brought fresh capabilities to the field. It served demands unmet by existing SDI standards.
The bitrate for this new serial digital interface is remarkable. It handles both 2970 Mbit/s and 2970/1.001 Mbit/s. This greatly elevates the SDI data rate.
Moreover, its example video format is 1080p60. It guarantees high-quality and smooth video. Especially when fed into an SDI output.
3G-SDI is another advanced SDI variant. Also known as Third Generation Serial Digital Interface. The standard is SMPTE 424M.
First introduced in 2006, it delivers robust performance. It’s an enhancement from previous versions.
What’s notable is its bitrate. It’s capable of managing 2970 Mbit/s and 2970/1.001 Mbit/s. This implies significantly high data transfer rates.
The supported video format includes 1080p60. This format delivers high-definition video. It provides smooth viewing experiences.
In essence, 3G-SDI is a step forward in video transmission. It supports high bitrate and resolution. It offers excellent video quality over a single cable. An ideal choice for broadcasters.
6G-SDI is an advanced type of SDI. It is referred to as the Sixth Generation Serial Digital Interface. Its designated standard is SMPTE ST 2081.
It made its debut in 2015. With it surfaced greater potential for broadcasting and digital video.
An extraordinary feature is its bitrate. It supports a bitrate of 6000 Mbit/s. This allows faster data transmission.
The 6G-SDI supports superior video formats. Specifically, 1080p120 and 2160p30. These formats offer ultra-high-definition video. They translate to enhanced viewing experiences.
12G-SDI is an innovation in SDI technology. It stands for Twelfth Generation Serial Digital Interface. The standard is SMPTE ST 2082.
This format emerged in 2015. It boasts improved performance over previous versions.
A key feature of 12G-SDI is the bitrate. The supported bitrate is a whopping 12000 Mbit/s. It is a huge leap in data transmission speed.
Among its supported video formats is 2160p60. This format supports ultra-high-definition video. It ensures clear, high-resolution visuals.
24G-SDI represents a quantum leap in SDI technology. Its full name is Twenty-Fourth Generation Serial Digital Interface. Its standard is SMPTE ST 2083.
Just introduced in 2020, it takes SDI to a new level. It surpasses all previous versions in performance.
A significant feature is its bitrate. It supports a staggering 24000 Mbit/s. This is by far the highest data transmission rate in SDI technology.
Further, it supports exclusive video formats such as 2160p120 and 4320p30. These make way for super high-resolution videos.
In essence, 24G-SDI exhibits an unparalleled leap in capability. It offers supreme speed and extraordinary video quality. Truly, it represents the future of video transmission technology.
Both HDMI and SDI function as connectors. They transmit audio and video signals. But they differ in utility and performance.
SDI is popular in professional video settings. That’s the common choice for motion picture and broadcasting use. HDMI, short for High Definition Multimedia Interface, is found more in consumer electronics.
The SDI connectors have a locking mechanism. It ensures secure connections during long runs. HDMI connectors lack this feature. So, SDI connectors, known as BNC connectors, are less prone to accidental disconnections.
SDI stands out in terms of transmission distance. It can transmit signals farther than an HDMI cable can. That matters much in professional settings.
Thus, HDMI and SDI have their own merits. Deciding between the two involves a careful evaluation of specific needs.
Further Reading:
SDI vs. HDMI: Difference between SDI and HDMI Connectors
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