In communications, a simplex communication link is one way only, and a duplex link goes in both directions. An example of a simplex link is a satellite beaming a signal to a receiver dish where the communication only goes in one direction, from the origin to a receiver. An example of a duplex link is a telephone.
Most duplex communication links have two links: one to transmit and one to receive. A half duplex link can both receive and transmit, but it cannot do both at the same time. An example of a half duplex link is a walkie-talkie. The person talking on a walkie-talkie cannot receive while talking.
The same terminology can be used in other fields. An electrical circuit with one wire set up such that the current can only flow one way is a simplex link. Simplex fiber-optic cables have only one fiber-optic relay inside them, and duplex fiber-optic cables have two fiber-optic relays inside them.
The same terms have been borrowed for use in printing and scanning, but the terms are used somewhat incorrectly. Printers may offer the option of duplex printing, namely printing on both sides of the paper, or simplex printing, on only one side of the paper. Duplex scanners scan both sides of the paper, and simplex scanners scan only one side.Learn More
DC current is direct current, which means electricity only flows in one direction; AC current is alternating current, which means it flows in both directions. Batteries run on DC current, while AC current is what comes in through an electrical plug in the wall.Full Answer >
The main difference between FTP and Telnet is that FTP is used when transferring files from one computer to another, while Telnet allows users to remotely log in to another computer, and once logged in, users can issue commands remotely. Both FTP (file transfer protocol) and Telnet are protocols that enable computers to communicate with each other.Full Answer >
A toolbar is part of the user interface of a specific program that allows the user access to certain program controls, while a taskbar allows for access to different programs. A taskbar is usually at the edge of the display for an operating system such as Windows and provides a way for the user to open, close or switch between programs.Full Answer >
Since ADSL2 is an enhanced version of ADSL, or Asymmetrical Digital Subscriber Line, it has faster download rates and greater resistance to line noise. Line noise refers to the variation in a transmitted signal that typically occurs in electric connections.Full Answer >