Throughput and delay analysis for a new efficient CSMA/CD based protocol

The authors describe a two-channel reservation network with priority access (TCRN/PA) that uses both channels and advance reservation to increase network throughput with shorter delay than carrier-sense multiple access with collision detection (CSMA-CD). A contention channel (C-channel) carriers the reservation broadcasts while a data channel (D-channel) delivers the transmitted data. Each D-channel transmission is restricted to a limited number of data packets so that no one station dominates the channel. Each station limits the number of unsuccessful attempts to transmit each C-channel request packet to 20. Data packets sent to each station for transmission are ranked according to their arrival time, with older data sent at higher priority. The performance of TCRN/PA is compared with that of CSMA-CD-based networks, such as SRMA and ring and polling networks, for identical system bandwidths and is found to give greater throughput, as well as shorter delay, particularly at high throughputs