| 单词 | CSMA (Carrier Sense Multiple Access) |
| 释义 | CSMA (Carrier Sense Multiple Access) • P-Persistent CSMA: A machine may transmit a frame during an idle time with probability p or lower, based on the length of the idle time as measured by a time slot. A time slot is the maximum packet transmission time for a station at one extreme end of the network to send a packet to a station at the opposite extreme end of the network, and is based on the physical length of the cable, the physical size of the frames, and the speed of signal propagation through the wire or fiber. If a machine senses an idle condition on the channel, it transmits with probability p for one time slot. The machine then delays for worst-case propagation delay for one packet with probability 1–p. If the channel is busy, the machine listens persistently until the channel becomes idle, and starts over. For example, p.01 means that there is a probability of 1 percent that the transmission will be unsuccessful. If p is set very low (e.g., .01), throughput is nearly 100 percent, but transmission delays will be very long, as the machine will wait a very long time between idle periods. CSMA is implemented in two standard means: CSMA/CD provides collision detection, and CSMA/CA provides collision avoidance. See also carrier, channel, CSMA/CA, CSMA/CD, Ethernet, LAN, MAC, node, propagation, propagation delay, station, and time slot. |
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