Abstract: A broadband network designed in accordance with MAP is considered to be indispensable for the computer integrated manufacturing system (CIMS) in automated factories. So the research and development of its protocols, software, and hardware are very much emphasized. In this paper, a broadband communication sub-network implemented in accordance with MAP is introduced. It mainly consists of three lower layers, the physical, data link and network layers of the ISO/OSI Eeference Model. The data transfer experiment in the communication Sub-network has been successfully done in our laboratory.

Key words: interface message processor, AM/PSK modulation, MAP (manufacturing automation protocol), broadband communication subnetwork