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%ما هو (من)٪ 1 - تعريف
HIGH-END WORKSTATION COMPUTER, 1990 USED TO DEVELOP THE WWW
Next Computer; NeXT Computer System
Duplex (telecommunications)
![A simple illustration of a full-duplex communication system. Full-duplex is not common in handheld radios as shown here due to the cost and complexity of common duplexing methods, but is used in [[telephone]]s, [[cellphone]]s and [[cordless phone]]s.](https://commons.wikimedia.org/wiki/Special:FilePath/FullDuplex.JPG?width=200 "A simple illustration of a full-duplex communication system. Full-duplex is not common in handheld radios as shown here due to the cost and complexity of common duplexing methods, but is used in [[telephone]]s, [[cellphone]]s and [[cordless phone]]s.")
COMMUNICATION FLOWING IN BOTH DIRECTIONS SIMULTANEOUSLY
Half-duplex; Full-duplex; Time-division duplex; Frequency division duplex; Duplexing; Frequency duplex; Full duplex; Duplex communication; Half duplex; Duplex Communication; Duplex (Telecommunications); Duplex (communications); Duplex transmission; Full-duplexed; Duplex channel; Duplex telecommunications; Full Duplex; Two-way simultaneous; Time division duplex; Half Duplex; Frequency-Division Duplex; Frequency division duplexing; Half duplex communication; Frequency-division duplex; Duplex conversation; Half-duplex conversation; Full-duplex conversation; Half-duplex operation; Dual-simplex; Dual simplex; Transmit/receive transition gap; Receive/transmit transition gap; Semiduplex
A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions. Duplex systems are employed in many communications networks, either to allow for simultaneous communication in both directions between two connected parties or to provide a reverse path for the monitoring and remote adjustment of equipment in the field.
half-duplex
COMMUNICATION FLOWING IN BOTH DIRECTIONS SIMULTANEOUSLY
Half-duplex; Full-duplex; Time-division duplex; Frequency division duplex; Duplexing; Frequency duplex; Full duplex; Duplex communication; Half duplex; Duplex Communication; Duplex (Telecommunications); Duplex (communications); Duplex transmission; Full-duplexed; Duplex channel; Duplex telecommunications; Full Duplex; Two-way simultaneous; Time division duplex; Half Duplex; Frequency-Division Duplex; Frequency division duplexing; Half duplex communication; Frequency-division duplex; Duplex conversation; Half-duplex conversation; Full-duplex conversation; Half-duplex operation; Dual-simplex; Dual simplex; Transmit/receive transition gap; Receive/transmit transition gap; Semiduplex
<communications> (hdx, from telegraphy) 1. A type of
communication channel using a single circuit which can carry
data in either direction but not both directions at once.
Compare: simplex, full-duplex.
2. An obsolete term for local echo.
(2001-07-21)
full-duplex
COMMUNICATION FLOWING IN BOTH DIRECTIONS SIMULTANEOUSLY
Half-duplex; Full-duplex; Time-division duplex; Frequency division duplex; Duplexing; Frequency duplex; Full duplex; Duplex communication; Half duplex; Duplex Communication; Duplex (Telecommunications); Duplex (communications); Duplex transmission; Full-duplexed; Duplex channel; Duplex telecommunications; Full Duplex; Two-way simultaneous; Time division duplex; Half Duplex; Frequency-Division Duplex; Frequency division duplexing; Half duplex communication; Frequency-division duplex; Duplex conversation; Half-duplex conversation; Full-duplex conversation; Half-duplex operation; Dual-simplex; Dual simplex; Transmit/receive transition gap; Receive/transmit transition gap; Semiduplex
<communications> (fdx, from telegraphy) 1. A type of
duplex communications channel which carries data in both
directions at once.
On purely digital connections, full-duplex communication
requires two pairs of wires. On analog networks or in
digital networks using carriers, it is achieved by dividing
the bandwidth of the line into two frequencies, one for
sending, and the other for receiving.
2. An obsolete term for remote echo.
Compare simplex, half-duplex, double-duplex.
(2001-07-21)
ويكيبيديا
NeXT Computer
NeXT Computer (also called the NeXT Computer System) is a workstation computer that was developed, marketed, and sold by NeXT Inc. It was introduced in October 1988 as the company's first and flagship product, at a price of US$6,500 (equivalent to $14,900 in 2021), aimed at the higher-education market. It was designed around the Motorola 68030 CPU and 68882 floating-point coprocessor, with a clock speed of 25 MHz. Its NeXTSTEP operating system is based on the Mach microkernel and BSD-derived Unix, with a proprietary GUI using a Display PostScript-based back end. The enclosure consists of a 1-foot (305 mm) die-cast magnesium cube-shaped black case, which led to the machine being informally referred to as "The Cube".
The NeXT Computer was renamed NeXTcube in a later upgrade. The NeXTstation, a more affordable version of the NeXTcube, was released in 1990.
