1‐persistent DUAL channel local area network for integrated voice and data application
Dhadesugoor R. Vaman, Chin Tu Wu, Kal Lu · International Journal of Digital & Analog Cabled Systems · 1988
Abstract It is a well‐known fact that the carrier sense multiple access with collission detection (CSMA/CD) protocol would suffer from throughput degradations and long packet delays at heavy loads due to excessive collisions and retransmissions, and thus is not suitable for voice/data integration. Recently, a new protocol called carrier sense multiple access with time‐split collision detection and split channel reservation (CSMA‐TCD‐SCR) has been proposed1 to improve the channel throughput of CSMA/CD protocol by splitting the common channel into dual channels, i.e. one for data transfer and the other for reservation. It has been shown that the CSMA‐TCD‐SCR protocol improves the channel throughput and stability performance significantly.1 In this paper, we propose a 1‐persistent dual‐channel LAN (1P‐DC‐LAN) protocol with the tree algorithm for reservation, which is an extension of the CSMA‐TCD‐SCR protocol, for voice/data integration applications. Through approximate analytical modelling and computer simulations, it has been demonstrated that the 1P‐DC‐LAN protocol exhibits nearperfect scheduling throughputs for data transmission and highly bounded voice packet delays. In addition, the results were compared with IEEE 802.3 CSMA/CD and twin‐channel CSMA/CD.