The VESA Enhanced Video Connector is a VESA

VESA

VESA is an international standards body for computer graphics founded in 1989 by NEC Home Electronics and eight other video display adapter manufacturers.VESA's initial goal was to produce a standard for 800×600 SVGA resolution video displays...

 standard intended to reduce the number of cables around a computer by incorporating video, audio, FireWire and USB into a single cable system. The intention of the system was to make the monitor the central point of connection. Although the specific idea did not find favour with computer manufacturers, it was evolved into the somewhat more popular VESA Plug and Display standard.

A VESA EVC connector is capable of carrying analog video (VGA-based) output, video input (composite), FireWire, audio (analogue stereo), and USB signals. Pinout is somewhat similar to the newer VESA Plug and Display. It can be distinguished from a Plug and Display connector by the shell, which is shaped like an isosceles trapezoid

Isosceles trapezoid

In Euclidean geometry, an isosceles trapezoid is a convex quadrilateral with a line of symmetry bisecting one pair of opposite sides, making it automatically a trapezoid...

 similar to the shell of a D-subminiature

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 smaller connectors used on computer systems....

 instead of the "D"-shaped shell of a DVI

Digital Visual Interface

The Digital Visual Interface is a video interface standard covering the transmission of video between a source device and a display device. The DVI standard has achieved widespread acceptance in the PC industry, both in desktop PCs and monitors...

connector.