In a carrier-sense multiple access (CSMA) media-access control protocol, a
collision occurs when two stations attempt to transmit at the
same time. Since the messages interfere with each other, the
collision must be avoided or detected. In CD,
each station to listen to the network after transmission. If
another station has transmitted at the same time, both stations
stop transmitting and wait a random period of time before
trying to transmit again.
Other topics in our resources on Communications Systems related to CD include: