Polling system for multiple terminal units

摘要: A semi-duplex communication system provides high channel efficiency by having the base station transmit a reference signal which each terminal uses as sync signal. Each unit data to send responds with very brief such burst of silent carrier transmission during an assigned time slot in queue slots. Only those units responded thus are polled subsequent polling cycle. During slots, can be sending acknowledgments sent messages previous While for or acknowledgments, also listening respective responses. The address code is further encoded carry other required information both directions.