Online Offline#
When many devices are connected to a sync master it is often convenient, if one wants to hear just the output of one single device, to take it offline because, if the device is played back online, all synchronized devices have to locate the playback point and wait for each other device to be in synchronization.
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A device that is offline uses no external clock reference and relies upon its own internal clock. When the sync master commences playback, the online device automatically synchronizes itself to the master and commences playing from the same point in the recording. A tape recorder, digital audio editor, or other device that is online is one whose clock is under the control of the clock of a synchronization master device. Offline media playing Īnother example of the use of these concepts is digital audio technology. Similarly, a computer may be configured to employ a dial-up connection on demand (as when an application such as Outlook attempts to make connection to a server), but the user may not wish for Outlook to trigger that call whenever it is configured to check for mail. the computer itself may be online-connected to Internet via a cable modem or other means-while Outlook is kept offline by the user, so that it makes no attempt to send or to receive messages. The online or offline state of the MUA does not necessarily reflect the connection status between the computer on which it is running and the internet i.e. When online it will attempt to connect to mail servers (to check for new mail at regular intervals, for example), and when offline it will not attempt to make any such connection. One example of a common use of these concepts with email is a mail user agent (MUA) that can be instructed to be in either online or offline states. The message is preserved by means of holes punched in the tape and is transmitted later by feeding the tape to another machine. Other teletype machines are operated off line, through the intervention of punched paper tape. Their operators are in instantaneous communication. For example, some teletype machines operate on line. These requirements may be compared with teleprinter operating requirements. For other applications, off-line operation, involving automatic transcription of data in a form suitable for later introduction to the machine, may be tolerated. In on-line operation the input is communicated directly and without delay to the data-reduction device. For some applications, of which the most prominent are those in which the reduced data are used to control the process being measured, the input must be developed for on-line operation. Here is an excerpt from the 1950 book High-Speed Computing Devices: The use of automatic computing equipment for large-scale reduction of data will be strikingly successful only if means are provided for the automatic transcription of these data to a form suitable for automatic entry into the machine. Since at least 1950, in computing, the terms on-line and off-line have been used to refer to whether machines, including computers and peripheral devices, are connected or not. Telegraph linemen would refer to sending current through a line as direct on line or battery on line or they may refer to a problem with the circuit as being on line, as opposed to the power source or end-point equipment. For railroads, a signal box would send messages down the line (track), via a telegraph line (cable), indicating the track's status: Train on line or Line clear. History ĭuring the 19th century, the term on line was commonly used in both the railroad and telegraph industries. The term "offline" is sometimes used interchangeably with the acronym "IRL", meaning "in real life". In contrast, "offline" can refer to either computing activities performed while disconnected from the Internet, or alternatives to Internet activities (such as shopping in brick-and-mortar stores). Similar meaning is also given by the prefixes " cyber" and "e", as in the words " cyberspace", " cybercrime", " email", and " ecommerce".
"Online" has come to describe activities performed on and data available on the Internet, for example: " online identity", " online predator", " online gambling", " online game", " online shopping", " online banking", and " online learning". Being online means that the equipment or subsystem is connected, or that it is ready for use.
In modern terminology, this usually refers to an Internet connection, but (especially when expressed "on line" or "on the line") could refer to any piece of equipment or functional unit that is connected to a larger system. In computer technology and telecommunications, online indicates a state of connectivity and offline indicates a disconnected state. For other uses, see Online (disambiguation) and Offline (disambiguation).
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