Short for fourth generation, 4G is an ITU specification that is currently being developed for broadband mobile capabilities. 4G technologies would enable IP-based voice, data and streaming multimedia at higher speeds and offer at least 100 Mbit/s with high mobility and up to 1GBit/s with low mobility (nomadic).
4G is an IP-based and packet-switched evolution of 3G technologies (such as WCDMA, HSDPA, CDMA2000 and EVDO) that uses voice communications. A number of technologies considered to be 4G standards include Long Term Evolution (LTE), Ultra Mobile Broadband (UMB) and the IEEE 802.16 (WiMax) standard.
While 3G is defined by ITU as IMT-2000, IMT-Advanced is being studied by ITU as 4G. IMT is now used as the generic name for 3G and 4G.
See “Technology Terms to Know for 2009” in the Did You Know…? section of
In digital video, video signals are encoded when recorded and decoded on playback. Depending on the digital format, the video signal will be sampled at either 4:1:1 or 4:2:2. See anamorphic widescreen.
- 0FB - zero feedback
On eBay, eBay alternatives, and classified ad Web sites, 0FB is an abbreviation used to mean zero feedback. It is in reference to a new member on the site who has not completed any buying or selling transaction on the site.
- 5.1 Surround Sound
)A multichannel sound technology that produces five channels of sound in the left, right, center, left surround and right surround positions. 5.1 systems also have 1 channel for LFE (low frequency effects) which is usually sent to a subwoofer.
The term 525/60 refers to the analog TV system NTSC used for years in the United States. NTSC is a system of 525 scanning lines (presented as 240 scan lines (a field), interlaced, displaying 480 total lines of visible picture (a frame), at 60 hertz. This 60 hertz scanning rate results in a full frame […]
- 5-4-3 rule
Ethernet and IEEE 802.3 implement a rule, known as the 5-4-3 rule, for the number of repeaters and segments on shared access Ethernet backbones in a tree topology. The 5-4-3 rule divides the network into two types of physical segments: populated (user) segments, and unpopulated (link) segments. User segments have users’ systems connected to them. […]