1-persistent CSMA To avoid idle channel time 1-persistent protocol can be use a station wishing to transmit listens to the medium and obeys the following rules 1. If medium is idle, transmit; otherwise, go to step 2 2. If medium is busy continue to listen until the channel is sensed idle, then transmit immediately 1-persistent stations are selfish Drawback: If two or more stations are waiting to transmit, a collision is guaranteed11 1-persistent CSMA • To avoid idle channel time, 1-persistent protocol can be used • A station wishing to transmit listens to the medium and obeys the following rules: 1. If medium is idle, transmit; otherwise, go to step 2 2. If medium is busy, continue to listen until the channel is sensed idle; then transmit immediately. • 1-persistent stations are selfish • Drawback: — If two or more stations are waiting to transmit, a collision is guaranteed