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A telecommunications link is generally based on one of several types of information transmission paths such as those provided by communication satellites, terrestrial radio communications infrastructure and computer networks to connect two or more points. The term link is widely used in computer networking to refer to the communications ...
The crossing of wires in a cable or in a connector adaptor allows: connecting two devices directly, output of one to input of the other, letting two terminal (DTE) devices communicate without an interconnecting hub knot, i.e. PCs, linking two or more hubs, switches or routers (DCE) together, possibly to work as one wider device.
In the case of GSM mobile phones, it also includes the subscriber identity module, which is also present as a smart card on satellite TV receivers, or a different PCMCIA CableCARD for cable TV. Addressing and encryption are used together for conditional access to different TV channel bundles which a pay-TV customer has or has not paid for.
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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 ...
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The transmission media (often referred to in the literature as the physical medium) used to link devices to form a computer network include electrical cable, optical fiber, and free space. In the OSI model, the software to handle the media is defined at layers 1 and 2 — the physical layer and the data link layer.
PANs can be used for communication among the personal devices themselves, or for connecting to a higher level network and the Internet where one master device takes up the role as gateway. A PAN may be carried over wired interfaces such as USB , but is predominantly carried wirelessly, also called a wireless personal area network ( WPAN ).