Digital cable Connectors
Video devices use a variety of different interfaces. However, most video connector types share the common trait of being easy to connect. Manufacturers of consumer electronics prefer to use simple interfaces that average users can connect and disconnect without having to tighten thumbscrews, or release tabs or latches. This preference can prove challenging to manufacturers who must balance convenience with performance. Projectors and televisions use the widest variety of these connectors. Projectors use specialty connectors that offer both video and control through a single connection.
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BNC connectors are round plugs with a bayonet-style locking system, used on coaxial cables. BNC plugs have good impedance characteristics, and their locking mechanism keeps them securely in place once connected. Because they are more expensive and harder to connect than RCA plugs, they are often used for higher-end and/or professional audio/video equipment. They are very common in CCTV and surveillance camera applications. There are many popular theories explaining the acronym "BNC", but the most likely is "Bayonet-Neill-Concelman", which refers to the two gentlemen that developed it years ago (Paul Neill from Bell Labs, and Carl Concelman from Amphenol). The two most common uses for BNC connectors are in a 3-BNC (RGB) component video and 5-BNC (RGBHV) component video cable. This component video interface is the most common extended definition video interface in use on contemporary consumer products. Component connections send one luminance and two phase-opposite chrominance signals on three 75 Ohm coaxial cables. Wholly analog, the 770.3 component interface boasts the same robust nature as RGBHV.
DisplayPort is an interface technology that is designed to connect high-end graphics capable PCs and displays as well as home theater equipment and displays. Like HDMI and DVI, DisplayPort utilizes TMDS (Transition Minimized Differential Signaling) link technology to send high bandwidth video and audio signals. The 20-pin connector allows the contact point to send maximum data transfer rates of 8.64 Gbps plus 1 Mbps for its AUX channel which can carry additional data.
This connector contains 24 pins, arranged in three horizontal rows of eight pins. To the side of this grouping of 24 pins is a wide, flat pin called a ground bar. A dual-link interface provides two TMDS links, or groups of data "channels" that can carry more than 10 Gbps of digital video information. A dual-link cable is backwards-compatible with single-link applications. The majority of DVI applications will use this DVI-D dual-link cable connection.