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.Continue Reading
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 about Internet & Networking
A main-distribution-frame network is a telecom system that uses an MDF panel, as opposed to a patch panel, to connect complementary communications networks via flexible jumper cables. A facility's MDF panel usually takes a signal from outside and distributes it to the internal switching networks.Full Answer >
Security plus certification – training to secure infrastructure and proprietary data such as user accounts and financial databases as well as communications – can help develop more secure website design when network and systems engineers are part of the design team, saving Web developers time and money. Security plus certification, which trains information technology professionals to secure servers and networks, is important in website design in both planning and implementation.Full Answer >
Computer polling refers to a computer communications technique that requires a central computer to continually check its connected terminals to establish whether they are ready to transmit data. This technique serves to ascertain the readiness of any terminal to send data from one end to another.Full Answer >
The difference between narrowband and broadband is that narrowband communications use a smaller bandwidth range than wideband communications. Additionally, in terms of access to the Internet, narrowband connections provide data at a slower rate, while broadband connections offer a higher data rate. Narrowband and broadband, or wideband, are terms which refer to the amount of bandwidth used to transfer information.Full Answer >