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High-Tech Dictionary >> Hardware
Word Definition
Cable Modem
Cable modem provides access of computers to network over cable TV lines. Most cable modems supply a 10 Mbps Ethernet connection for the home LAN. Cable modem achieve higher access speed to the World Wide Web than phone lines using dial up modem or even ADSL modem. The actual performance of a cable modem Internet connection can vary depending on the utilization of the shared cable line in that neighborhood, but typical data rates range from 300 Kbps to 1500 Kbps.
Cache
Cashe is a high-speed storage mechanism. It can be either a reserved section of main memory (memory cache) or an independent high-speed storage device (disk cache). A memory cache, also known as a cache store or RAM cache, is a portion of memory made of high-speed static RAM (SRAM). Memory caching is effective because most programs access the same data or instructions over and over. By keeping as much of this information as possible in SRAM, the computer avoids accessing the slower DRAM.
Cache Coherence
Cache coherence is a mechanism for managing the caches of a multiprocessor system so that no data is lost or overwritten before the data is transferred from a cache to the target memory. When two or more computer processors work together on a single program, known as multiprocessing, each processor may have its own memory cache that is separate from the larger RAM that the individual processors will access.
Caddy Drive
Caddy drive is a type of disk drives that require the media to be placed into a cartridge before insertion into the drive. Other types of disk drives are tray drive and feed drive. The first CD-ROM and CD-R drives were caddy drives, but eventually evolved into tray drives.
CAM: Content Addressable Memory
Content Addressable Memory (CAM) is a special type of computer memory used in certain very high speed searching applications. CAM is designed such that the user supplies a data word and the CAM searches its entire memory to see if that data word is stored anywhere in it. If the data word is found, the CAM returns a list of one or more storage addresses where the word was found (and in some architectures, it also returns the data word, or other associated pieces of data). Thus, a CAM is the hardware embodiment of what in software terms would be called an associative array.
Candela
Candela is the International System of Units standard unit of measurement of luminous intensity. The candela is equal to the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and has a radiant intensity in that direction of 1/683 watt per unit solid angle
Capacitive Keyboard
Capacitive keyboard uses changes in capacitance, or stored static electricity, to register when a user has pressed a specific key on the keyboard. The other type of keyboard called contact keyboard uses changes in flows of electricity to register. Under the keyboard keys of the capacity keyboard are capacitors that store electricity as opposite static charges in pairs of conductive plates made from nickel-plated copper that are separated by a non-conductive material. The opposite static charges hold an attractive field between them, but the insulating material prevents the charges from canceling each other out by coming together. When a key is pressed, the pads move closer to each other and change the capacity for storing a charge, which the keyboard detects as a start or stop in the flow of electricity and inputs the correct keystroke.
CardBus
CardBus is the 32-bit version of the PCMCIA PC Card standard. CardBus also supports bus mastering and operation speeds up to 33 MHz. The CardBus interface supports multiple bus functions which may be implemented in any combination. Use of a bus master function allows the system processor to be offloaded.
Cassette
Cassette is a removable magnetic tape storage module that contains supply and takeup reels. Many traditional all audio tapes and videotapes use cassettes as well as backup tape technologies such as DAT, 8mm and Magstar MP.
CAT2: Category 2 Cable
Category 2 Cabling (CAT2), one of five grades of UTP cabling described in the EIA/TIA-586 standard, is designed to transmit data at a speed up to 4 Mbps.
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Random Words
 
Word : Sequential Couleurs a Memoire
Explanation : (SECAM). Also called Systeme Electronique Couleur Avec Memoire. The television broadcast standard used in France, the Middle East, and most of Eastern Europe. SECAM broadcasts an analog signal at 819 lines of resolution 25 interlaced frames a second, and uses sequential encoding of primary colors in alternating scan lines. PAL is the standard used in England and the rest of Europe; NTSC is used in the U.S. and Japan.
 
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Tech Word for Today
 Word : 0KB.IN
 Explanation : 0KB.IN - Free Knowledge Base of Internet
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