1. A connector that attaches to a cable without blocking the passage of information along that cable 2. In communications, a connection onto the main transmission medium of the network.
A self-contained tape storage module, containing tape much like that in a video cassette. Tape cartridges are primarily used to back up hard disk systems.
A computer peripheral that reads from and writes to magnetic tape. The drive may use tape on an open reel, or may use one of the small, enclosed tape cartridges. Because tape-management software has to search from beginning of the tape everytime it wants to find a file, tape is too slow to use as a primary storage system, but tapes are frequently used to back up hard disks.
A T-shaped connector, used with coaxial cable, that connects two thin Ethernet cables and also provides a third connector for the network interface card.
Transmission Control Protocol/Internet Protocol. A set of computer-to-computer communications protocols first developed for the Defencse Advanced Research Projects Agency (DARPA) in the late 1970's. The set of TCP/IP protocols encompass media access, packet transport, session communications, file transfer, e-mail, and terminal emulation.
TCP/IP is supported by a very large number of hardware and software vendors, and is available on many different computers from PCs to mainframes. Many corporations, universities, and government agencies use TCP/IP, and it is also the foundation of the Internet.
That part of TCP/IP suite used for remote login and terminal emulation; also the name of the program used to connect to the Internet host systems.
Originally a Unix utility, telnet is available now for almost all popular OSes.
temporary swap file
A sway file that is created every time it is needed. A temporary swap file will not consist of a single large area of contiguous hard disk space, but may consist of several discontinuous pieces of space.
TSR. A DOS program that stays loaded in memory, even when it is not actually running , so that you can invoke it very quickly to perform a specific task.
Calendars, appointment schedulers, calculators are all popular TSR programs. TSRs occupy conventinal memory space that becomes unavailable for use by your applications programs
A device attached to the last peripheral in a series, or the last node on a network.
In computer programming, software used to prepare program source code.
A file that consists of text characters without any formatting information. Also known as an ASCII file, a text file can be read by any word processor.
A nonimpact printer that uses a thermal printhead and specially treated paper to create an image. The main advangtage of a thermal printer is that it is virtually silent. Thermal printers are used in calculators and in terminals to provide a local printing capability.
Connecting coaxial cable used on an Ethernet network. The cable is 1 cm thick, and can be used to connect network nodes up to a distance of approx. 3300 feet. Primarily used for facility-wide installations.
Connecting coaxial cable used on an Ethernet network. The cable is 5 mm thick, and can be used to connect network nodes up to a distance of approx. 1000 feet. Primarily used for office installations.
An excessive amount of disk activity in a virtual memory system, to the point where the system is spending all its time swapping pages in and out of memory, and no time executing the application. Thrashing can be caused when poor system configuration creates a swap file that is too small, or when insufficient memory is installed in the computer. Increasing the size of the swap file and adding memory are the best ways to reduce thrashing.
A concurrent process that is part of a larger process or progra. In a multitasking OS, a program may contain several threads, all running at the same time inside the same program. This means that one part of a program can be making a calculation, while another part is drawing a graph or chart.
A long-distance, point-to-point 1.544mbps communications channel that can be used for both digitized voice and data transmission;T1 lines are usually divided into 24 channels, each transmitting at 64 kilobits per second.
The replaceable cartridge in a laser printer or photocopier that contains the electrically charged ink to be fused to the paper during printing.
A special monitor that lets the user make choices by touching icons or graphical buttons on the screen.
A system unit case designed to stand on the floor rather than be placed on a desktop. Tower cases often have mor drive bays and expansion slots than the desktop units, and are commonly used for file servers and workstations.
A concentric collection of sectors on a hard- or floppy disk.
The outermost track on the top of the disk (or platter) is numbered track 0 side 0, and the outermost track on the other side is numbered track 0 side1. Numbering increases inwards towards the center of the disk. Tracks are created during the disk formatting process.
On tapes, tracks are parallel lines down the axis of the tape.
An input device used for pointing, designed as an alternative to the mouse. It is almost an upside-down mouse; it is stationary and contains a movable ball that you rotate using your fingers to move the mouse cursor on the screen.
A long-distance point-to-point 44.736mbps communications service that can provide up to 28 T1 channels. A T3 channel can carry 672 voice conversations, and is usually available over fiber-optic cable.
Cable that comprises two insulated wires twisted together at six twists per inch. In twisted-pair cable, one wire carries the signal and the other is grounded. Telephone wire installed in modern buildings is often twisted-pair wiring.