Short for 2 Binary 1 Quaternary, a full duplex physical layer encoding method used in ISDN and other digital communication technologies. In 2B1Q, two binary bits are encoded into one quaternary signal, doubling the effectiveness of transmission.
- 2-205 rule
A rule for the configuration of 100Base-T, or Fast Ethernet, networks. According to the rule, the maximum network distance, or network diameter, of two non-stackable network hubs connected by copper cabling cannot exceed 205 meters (approx. 672 feet). Also referred to as the Fast Ethernet rule.
- 2:2 pulldown
Also called telecine, 2:2 pulldown is the process used to convert motion picture movie film to PAL interlaced video. Each frame of film is converted into two interlaced video frames. This is the process that enables you to view captured motion pictures on standard televisions and video electronics. See anamorphic widescreen.
- 2:3 pulldown
Also called inverse telecine, 2:3 pulldown is a method of converting a 24 frame per second film into 59.94 field per second NTSC. It does not apply to films encoded for PAL. It works by showing every second frame for three fields, resulting in a frame-to-field pattern of 2-3-2-3-2-3. See anamorphic widescreen.
- 2-stage shutter release
Commonly employed on digital cameras, 2-stage shutter release is a shutter release, that when pressed halfway, it activates the autofocus and the light meter of the camera, setting them to achieve correct focus and exposure. Holding the release at mid-course maintains the focusing point and allows for re-composition if desired. A further press on the […]
Refers to the number of bits that can be processed or transmitted in parallel, or the number of bits used for single element in a data format. The term is often applied to the following: microprocessor: indicates the width of the registers. A 32-bit microprocessor can process data and memory addresses that are represented by […]