Encompasses a technology for the transmission of digital information at high bandwidths over a twisted metallic copper pairs.

 

A software or hardware system that copies or "shadows" the contents of a server, providing redundancy.

1. The range of frequencies that can pass over a given transmission channel. The bandwidth determines the rate at which information can be transmitted through the circuit: the greater the bandwidth, the more information that can be sent in a given amount of time. Bandwidth is typically measured in bits per second. Increasing bandwidth potential has become a high priority for network planners due to the growth of multimedia, including videoconferencing, and the increased use of the Internet.

2. The range of frequencies - on either side of the carrier frequency - within which the signal-to-noise ratio (SNR) of a modulated signal is tested.

 

A broad approach to planning for the recovery of an enterprise's entire business process in event of a massive disruption caused by catastrophic event (such as a natural disaster or terrorist attack). BCP includes plans for work facilities, telephone service, workstations, servers, applications, network connections and any other resources required for the continuity of business operations - as well as processes for communicating critical information to enterprise personnel, and steps to address their safety and welfare. The term is often used interchangeably with "disaster recovery planning" (DRP); however, the latter term is more commonly associated with IT system recovery alone, without the broader business context.

 

A representation of graphic image in the form of a series of bits, which correspond to a pattern of pixels on a video screen.

 

An online diary; a personal chronological log of thoughts published on a Web page; also called Weblog, Web log

 

A wireless networking technology with a range of about 10 meters and a raw data transmission rate of one megabit per second. Bluetooth supports ad hoc networking of up to 80 devices within a 10-meter radius (supporting voice and data).

 

Transmission over coaxial or fiber-optic cables that have a wider bandwidth than conventional telephone lines, giving them the ability to carry video, voice and data simultaneously. Cable modems and digital subscriber line (DSL) technologies are examples of broadband connectivity. See DSL

A software program that allows the user to find and read encoded documents in a form suitable for display, esp. such a program for use on the World Wide Web.

 

A group of eight bits handled as a logical unit. In text files, a byte is equivalent to a single character such as a letter, number or punctuation mark.

 

RAM memory that is set aside as a specialised buffer storage that is continually updated; used to optimize data transfers between system elements with different characteristics.

 

A Microsoft software license program.
 

A communications term, used to refer to a wave that carries a signal, or to a provider of voice or data communications services.

A broad term referring to applications and processes for managing Web, document and e-commerce-focused content.

The key component of a computer system, which contains the circuitry necessary to interpret and execute program instructions.

 

Software applications that allow companies to manage every aspect of their relationship with a customer. The aim of these systems is to assist in building lasting customer relationships - to turn customer satisfaction into customer loyalty.

 

An electronic filing system organised by fields, records and files. A field is a single piece of information, a record is a set of fields and a file is a collection of records.

 

The assurance that data has not been lost or corrupted in the course of being stored or communicated.

 

The system that serves as the map between logical names and network addresses in an Internet Protocol (IP) network. See IP.

 

A group of nodes on a network that form an administrative entity. In the Internet naming hierarchy, a domain is a grouping of networks based on organization type or geography.

 

A unique identifier for an Internet site or Internet Protocol (IP) network address, consisting of at least two segments separated by periods. Enterprises must register top-level domains with the Web Internet Registry and pay a yearly fee to maintain the registry.

 

 

The inability of a Web site or other server to respond to legitimate connections. DoS attacks are used to block access to a target Internet site.

 

Planning to ensure the timely recovery of information technology assets and services following a catastrophe, such as fire, flood or hardware failure. As such planning is increasingly coordinated with broader business recovery plans that go beyond IT, it is now commonly referred to as business continuity planning (BCP).

 

An "always-on" access technology that uses public switched telephone network (PSTN) infrastructure to offer high-speed access to the Internet. The technology exploits the unused capacity of the twisted-pair copper wire used in the PSTN. Various types of DSL technology include asymmetric DSL (ADSL), high-bit-rate DSL (HDSL), symmetric DSL (SDSL) and very-high-bit-rate DSL (VDSL). The whole group is sometimes referred to as "xDSL." See ADSL, HDSL, SDSL and VDSL.

 

A local-area network protocol featuring a bus topology and a 10 megabit per second data transfer rate.

 

A computer containing files available to all users connected to a local-area network (LAN).

 

An integrated collection of security measures designed to prevent unauthorized electronic access to a networked computer system.

 

A system of satellites, computers, and receivers that is able to determine the latitude and longitude of a receiver on Earth by calculating the time difference for signals from different satellites to reach the receiver.

 

A segment of text or a graphical item that serves as a cross-reference between parts of a hypertext document or between files or hypertext documents.

 

A vast computer network linking smaller computer networks worldwide

 

Use of Internet protocols for transmitting two-way audio signals in real time, as an alternative to traditional telephone carriers.

 

The basic underlying protocol of the Internet. Used in conjunction with Transmission Control Protocol (TCP), it provides a common address system and communications protocol to track the addresses of network nodes, route outgoing messages and recognize incoming ones.

 

A unique number assigned by an Internet authority that identifies a computer on the Internet, or on any other network that uses Internet Protocol (IP). It consists of four groups of numbers between 0 and 255, separated by periods (dots).

 

A type of digital subscriber line (DSL) service for carrying integrated services digital network (ISDN) data traffic. IDSL provides dedicated service for digital data communications at speeds of up to 144 kilobits per second. See DSL and ISDN.

 

Approximately million bytes (1,048,576, to be precise). This is the common unit used to specify the size of computer files, storage capacity or random-access memory (RAM).

 

Approximately one million bits of computer data (1,048,576, to be precise).

 

A class of network controller that determines the best routing for data transmission between a transmitter (sender) and a receiver.

 

A system or a program that receives requests from one or more client systems or programs to perform activities that allow the client to accomplish certain tasks.

 

A device that makes, breaks, or changes the connections in an electrical circuit. As a form of communications technology, switches are used to control network traffic.

 

A relational data language that provides a consistent, English-keyword-oriented set of facilities for data querying, definition, manipulation and control.

 

A local-area network (LAN) device that allows asynchronous dumb terminals to communicate with a host computer also attached to the LAN. It is useful in minimizing the amount of cabling where several terminals need to be attached to a mainframe.

 

Communication by individuals or groups using systems that support image, voice and data transfer over digital networks or telephone circuits.

A segment of self-replicating code planted illegally in a computer program, often to damage or shut down a system or network.

 

Transmission of voice communications over Internet Protocol (IP) data networks, such as IP-based LANs, intranets or the Internet.

 

The use of encryption in the lower protocol layers to provide a secure connection through an otherwise insecure network, typically the Internet. VPNs are generally cheaper than real private networks using private lines but rely on having the same encryption system at both ends.

 

A computer network that spans a relatively large geographical area.

 

 

Wireless
Any system or device, as a cellular phone, for transmitting messages or signals by electromagnetic waves.