영상(비디오) 전송 커넥터 종류 소개-bnc,vga,dvi,hdmi,sdi ,광커넥터
BNC (Bayonet Neill–Concelman)
The BNC (Bayonet Neill–Concelman) connector is a miniature quick connect/disconnect RF (radio frequency) connector used for coaxial cable. BNC connectors are made to match the characteristic impedance of cable at either 50 ohms or 75 ohms. They are usually applied for frequencies below 4 GHz and voltages below 500 volts. BNC connectors are used with miniature-to-subminiature coaxial cable in radio, television, and other radio-frequency electronic equipment, test instruments, and video signals. Nowadays, many composite video devices are still designed with the BNC interface. Because BNC connector costs lower than other video connectors and is widely used for composite video on commercial video devices, e.g. video optical converter, or also called coxa to fiber converter or video multiplexer.
VGA (Video Graphics Array)
VGA, is also called D-Sub. It is a three-row 15-pin DE-15 connector. This type of connector is found on many video cards, computer monitors, and high definition television sets. VGA connectors and cables carry analog component RGBHV (red, green, blue, horizontal sync, vertical sync) video signals, and VESA Display Data Channel (VESA DDC) data. Though VGA analog interface is used for high definition video, including resolutions of 1080p and highe, the transmission bandwidth of VGA is high enough to support even higher resolution playback, there can be picture quality degradation depending on cable quality and length. Thus, when using device with VGA interface, the link distance should be less than 10 m.
DVI (Digital Visual Interface)
Digital Visual Interface (DVI) is a video display interface developed by the Digital Display Working Group (DDWG) which is used to connect a video source, such as a display controller to a display device, or a computer monitor. Unlike VGA interface, DVI is digital, so no conversion is necessary before sending the signal to the monitor. But featuring support for analog connections, the DVI specification is compatible with the VGA interface. The interface is designed to transmit uncompressed digital video and can be configured to support multiple modes such as DVI-D (digital only), DVI-A (analog only), or DVI-I (digital and analog). Like VGA, DVI is also widely used in computer monitors and video transmission device.
HDMI (High Definition Multimedia Interface)
HDMI is also a type of high-definition interface of video transmission. One huge difference between HDMI and other interfaces mentioned above is that HDMI will carry and transmit both Video and Audio while the others just can carry video. HDMI is a digital replacement for analog video standards. It is usually used for transferring uncompressed video data and compressed or uncompressed digital audio data from an HDMI-compliant source device, such as a display controller, to a compatible computer monitor, video projector, digital television, or digital audio device. HDMI technology is the global standard for connecting high-definition equipment. And to a certain extent, HDMI device is more expensive than other interface devices.
SDI (Serial digital interface)
SDI is also a type of digital video interfaces which was first standardized by SMPTE (The Society of Motion Picture and Television Engineers) in 1989. A related standard, known as high-definition serial digital interface (HD-SDI), is standardized in SMPTE 292M; this provides a nominal data rate of 1.485 Gbit/s. HD-SDI is widely used in video optical converter. It is used for transmission of uncompressed, unencrypted digital video signals (optionally including embedded audio and time code) within television facilities; they can also be used for packetized data.
In a video optical converter, you may also find there is an optical interface on the device. The optical interface is only a physical interface which is used to connect fiber optic cable. In general, it can be designed with SC, ST, or FC etc.
Application of Video Optical Converter
Video optical converter is used to transmit Video, Audio signal and Data over fiber. It supports Point-to-Point or Daisy-Chain connection for long-haul video transmission. For example, video multiplexers are typically used in applications where the cameras have PTZ (pan–tilt–zoom) capabilities.
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