channel

channel

(1) A high-speed metal or optical fiber subsystem that provides a path between the computer and the control units of the peripheral devices. Used in mainframes and high-end servers, each channel is an independent unit that transfers data concurrently with other channels and the CPU. For example, in a 32-channel computer, 32 streams of data are transferred simultaneously. In contrast, the PCI bus in a desktop computer is a shared channel between all devices plugged into it.

(2) The physical connecting medium in a network, which could be twisted wire pairs, coaxial cable or optical fiber between clients, servers and other devices.

(3) A subchannel within a communications channel. Multiple channels are transmitted via different carrier frequencies or by interleaving bits and bytes. This usage of the term can refer to both wired and wireless transmission. See FDM and TDM.

(4) The Internet counterpart to a TV or radio channel. Information on a particular subject is transmitted to the user's computer from a Webcast site via the browser or push client. See Webcast, push client and push technology.

(5) The distributor/dealer sales channel. Vendors that sell in the channel rely on the sales ability of their dealers and the customer relationships they have built up over the years. Such vendors may also compete with the channel by selling direct to the customer via catalogs and the Web.

(6) See alpha channel.

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channel¹

1. a broad strait connecting two areas of sea

2. the bed or course of a river, stream, or canal

3. a navigable course through a body of water

4. Electronics

a. a band of radio frequencies assigned for a particular purpose, esp the broadcasting of a television signal

b. a path for an electromagnetic signal

c. a thin semiconductor layer between the source and drain of a field-effect transistor, the conductance of which is controlled by the gate voltage

5. a groove or flute, as in the shaft of a column

6. Computing

a. a path along which data can be transmitted between a central processing unit and one or more peripheral devices

b. one of the lines along the length of a paper tape on which information can be stored in the form of punched holes

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channel²

Nautical a flat timber or metal ledge projecting from the hull of a vessel above the chainplates to increase the angle of the shrouds

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Channel

the. short for English Channel

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channel [′chan·əl]

(chemical engineering)

In percolation filtration, a portion of the clay bed where there is a preponderance of flow.

(civil engineering)

A natural or artificial waterway connecting two bodies of water or containing moving water.

(communications)

A band of radio frequencies allocated for a particular purpose; a standard broadcasting channel is 10 kilohertz wide, a television channel 6 megahertz wide.

A path through which electrical transmission of information takes place.

(computer science)

A path along which digital or other information may flow in a computer.

The section of a storage medium that is accessible to a given reading station in a computer, such as a path parallel to the edge of a magnetic tape or drum or a path in a delay-line memory.

One of the longitudinal rows of intelligence holes punched along the length of paper tape. Also known as level.

A device or portion of a computer that controls and stores data and transfers information between the computer and peripheral equipment.

(electronics)

A path for a signal, as an audio amplifier may have several input channels.

The main current path between the source and drain electrodes in a field-effect transistor or other semiconductor device.

(engineering)

The forming of cavities in a gear lubricant at low temperatures because of congealing.

(hydrology)

The deeper portion of a waterway carrying the main current.

(navigation)

Navigable portion of a body of water.

(nucleonics)

A passage for fuel slugs or heat-transfer fluid in a reactor.

(petroleum engineering)

In a drilling operation, a cavity appearing behind the casing because of a defect in the cement.

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(chat)

channel - (Or "chat room", "room", depending on the system in question) The basic unit of group discussion in chat systems like IRC. Once one joins a channel, everything one types is read by others on that channel. Channels can either be named with numbers or with strings that begin with a "#" sign and can have topic descriptions (which are generally irrelevant to the actual subject of discussion). Some notable channels are "#initgame", "#hottub" and "#report". At times of international crisis, "#report" has hundreds of members, some of whom take turns listening to various news services and typing in summaries of the news, or in some cases, giving first-hand accounts of the action (e.g. Scud missile attacks in Tel Aviv during the Gulf War in 1991).