Simulation study of QoS guaranteed ATM transmission for future power system communication.

The Asynchronous Transfer Mode (ATM) will support communication services wi th both constant and variable bit rate, for example, data, voice, video tra nsmissions and, of particular note, multimedia applications combining those service components. However, many problems are required to be solved in or der to apply this technique to electric power company's network. Electric p ower companies are required to trasmit very important information, such as information regarding electric power control. The transission of this impor tant information is required to have very high duality. Therefore, if the i mportant information and the general information were switched in the same manner, the stringent QoS (Quality of Service) required for the important i nformation could not be guaranteed. We examine the QoS of future utility communications which include ATM-nativ e teleprotection signals, inter-LAN data communications and video conferenc e communications. First, we propose a more accurate model which can be expr essed by a multi-state Markovian process for computer data communication tr affic. Second, the implementation of a priority control scheme in an ATM sw itch is proposed to guarantee the QoS of important power system communicati ons. Finally, computer simulations are used to clarify the effectiveness of priority control and the feasibility of future ATM-based utility telecommu nication networks.