Under CSMA, a transmitter uses a carrier-sense mechanism to determine whether another transmission is in progress before initiating a transmission. That is, it tries to detect the presence of a carrier signal from another node before attempting to transmit. If a carrier is sensed, the node waits for the transmission in progress to end before initiating its own transmission. Using CSMA, multiple nodes may, in turn, send and receive on the same medium. Transmissions by one node are generally received by all other nodes connected to the medium.
Under CSMA a transmitter uses a carrier-sense mechanism to determine whether another transmission is in progress before initiating a transmission That is it tries to detect the presence of a carrier signal from another node before attempting to transmit If a carrier is sensed the node waits for the transmission in progress to end before initiating its own transmission Using CSMA multiple nodes may in turn send and receive on the same medium Transmissions by one node are generally received by all other nodes connected to the medium