Research of ATM Network Interface of Multiple Services Access Server Qi Bing1 , Zhang Yong2 , Li Gang3 , Wang Zhigang1 (11Dept. of Information Engineering , NCEPU(BJ) , Beijing 102206 ; 21Bureau of Communication , Liaoning Dandong Power Distribution Ltd , Dandong 118000 ; 31Liaoning Tieling Power Distribution Ltd , Tieling , 112000) Abstract : By researching the theory of ATM and analyzing the pow