Short for single carrier (1x) radio transmission technology, a 3G wireless technology based on the CDMA platform. 1xRTT has the capability of providing ISDN-like speeds of up to 144 Kbps.
1xRTT is also referred to as CDMA2000.
In computer and Internet slang, 24-7 is commonly used to describe an Internet connection that is available 24 hours a day, seven days a week. 24-7 connections usually refer to broadband Internet connections such as DSL or cable. Also called always on. See “Types of Internet Connections” in the Quick Reference section of
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.