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The VESA Enhanced Video Connector (EVC) is a
EVC was used for few products, perhaps most commonly found on the HP9000 B/C/J-class workstations introduced in 1997. Although EVC did not find favour with computer manufacturers, it evolved into the somewhat more popular VESA Plug and Display (P&D) standard using a physically identical 35-pin interface with a different shell, capable of transmitting video (both analog and digital) and data. Digital Visual Interface (DVI, 1999), essentially a modified version of P&D stripped of the data signals with higher maximum resolution by adding a second, three-pair digital video channel, would become the industry standard for digital video connections and achieved widespread implementation.
VESA Enhanced Video Connector from the PCMAG.com encyclopedia. Includes an image of how the idea was intended to work
{{AVconn Enhanced Video Connector VESA
VESA
VESA (), formally known as Video Electronics Standards Association, is an American standards organization, technical standards organization for computer display standards. The organization was incorporated in California in July 1989To retrieve ...
standard that was intended to reduce the number of cables around a computer by incorporating video, audio, FireWire
IEEE 1394 is an interface standard for a serial bus for high-speed communications and isochronous real-time data transfer. It was developed in the late 1980s and early 1990s by Apple in cooperation with a number of companies, primarily Sony a ...
and USB
Universal Serial Bus (USB) is an industry standard, developed by USB Implementers Forum (USB-IF), for digital data transmission and power delivery between many types of electronics. It specifies the architecture, in particular the physical ...
into a single cable system, terminating in a 35-pin Molex MicroCross connector. The intent was to make the monitor the central point of connection. The EVC physical standard was ratified in November 1994, and the pinout and signaling standard followed one year later.
History
The Video Electronic Standards Association (VESA) began working on a successor to the VGA connector for analog video and released the EVC physical standard in November 1994, followed by a pinout and signal standard in November 1995. After the P&D standard was released in June 1997, revisions to the EVC standards were issued in November 1997.
EVC was used for few products, perhaps most commonly found on the HP9000 B/C/J-class workstations introduced in 1997. Although EVC did not find favour with computer manufacturers, it evolved into the somewhat more popular VESA Plug and Display (P&D) standard using a physically identical 35-pin interface with a different shell, capable of transmitting video (both analog and digital) and data. Digital Visual Interface (DVI, 1999), essentially a modified version of P&D stripped of the data signals with higher maximum resolution by adding a second, three-pair digital video channel, would become the industry standard for digital video connections and achieved widespread implementation.
Technical
A VESA EVC connector is capable of carrying analog video ( VGA-based) output, video input (composite or S-video),FireWire
IEEE 1394 is an interface standard for a serial bus for high-speed communications and isochronous real-time data transfer. It was developed in the late 1980s and early 1990s by Apple in cooperation with a number of companies, primarily Sony a ...
, analog stereo audio (input and output), and USB
Universal Serial Bus (USB) is an industry standard, developed by USB Implementers Forum (USB-IF), for digital data transmission and power delivery between many types of electronics. It specifies the architecture, in particular the physical ...
signals. Analog video is carried by the C1–C4 pins surrounding the C5 crossed ground plane; this was a development of the 13W3 connector, which was typically fitted to high-end workstation
A workstation is a special computer designed for technical or computational science, scientific applications. Intended primarily to be used by a single user, they are commonly connected to a local area network and run multi-user operating syste ...
s and had three miniature coaxial terminals embedded in the connector. The quasi-coaxial "MicroCross" developed by Molex provided comparable shielding performance with a simpler assembly. The physical arrangement of the EVC pins is identical to the newer VESA Plug and Display (P&D), which carries digital video over the pins used in EVC to carry analog audio (input and output) and video input. The connectors can be distinguished by the shape of the shell: the shell of the EVC connector is shaped like an isosceles trapezoid
In Euclidean geometry, an isosceles trapezoid is a convex quadrilateral with a line of symmetry bisecting one pair of opposite sides. It is a special case of a trapezoid. Alternatively, it can be defined as a trapezoid in which both legs and bo ...
, similar to the shell of a D-subminiature
The D-subminiature or D-sub is a common type of electrical connector. They are named for their characteristic D-shaped metal shield. When they were introduced, D-subs were among the smallest connectors used on computer systems.
Description ...
connector, while the P&D connector instead has a D-shaped shell, similar to a DVI connector.
The updated EVC standards in 1997 gave it the alternate name P&D-A, linking it to the P&D family of connectors, which had been released earlier that year and specified an analog & digital video connector (P&D-A/D) and a digital-only video connector (P&D-D).
See also
* HDI-45 connector, a proprietary standard developed contemporaneously by Apple, also intended to consolidate multiple cablesReferences
VESA Enhanced Video Connector from the PCMAG.com encyclopedia. Includes an image of how the idea was intended to work
{{AVconn Enhanced Video Connector VESA