In telecommunication, a shared medium is a medium or channel of information transfer that serves more than one user at the same time.
In order for most channels to function correctly, no more than one user can be transmitting at a time, so a channel access method must always be in effect.
In circuit switching, each user typically gets a fixed share of the channel capacity. A multiplexing scheme divides up the capacity of the medium. Common multiplexing schemes include time-division multiplexing and frequency-division multiplexing. Channel access methods for circuit switching include time-division multiple access, frequency-division multiple access, etc.
In packet switching, the sharing is more dynamic — each user takes up little or none of the capacity when idle, and can utilize the entire capacity if transmitting while all other users are idle. Channel access methods for packet switching include carrier-sense multiple access, token passing, etc.
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In telecommunication, a shared medium is a medium or channel of information transfer that serves more than one user at the same time. In order for most channels to function correctly, no more than one user can be transmitting at a time, so a channel access method must always be in effect. In circuit switching, each user typically gets a fixed share of the channel capacity. A multiplexing scheme divides up the capacity of the medium. Common multiplexing schemes include time-division multiplexing and frequency-division multiplexing.
Les télécommunications sont définies comme la transmission d’informations à distance en utilisant des technologies électronique, informatique, de transmission filaire, optique ou électromagnétique. Ce terme a un sens plus large que son acception équivalente officielle « communication électronique ». Elles se distinguent ainsi de la poste qui transmet des informations ou des objets sous forme physique.
In telecommunications and computer networks, a channel access method or multiple access method allows more than two terminals connected to the same transmission medium to transmit over it and to share its capacity. Examples of shared physical media are wireless networks, bus networks, ring networks and point-to-point links operating in half-duplex mode. A channel access method is based on multiplexing, that allows several data streams or signals to share the same communication channel or transmission medium.