ISND is a kind of communication techology.By synthetical digital telephone network it furnishes the sort of link from terminal to terminal

and it is a kind of communication techology of wide area network applying multi telecommunication services for undertaking sound

digit

picture

fax

and video etc.ATM network techology is aimedat at the technique of link which has a great fexibility.ATM network can deal with various communication information together

like sound

video

and multi media etc.Either LAN or WAN circumstance can apply the same standard of ATM.Therefor it makes gapless link become a reality

and improve the handling capacity of a network.ATM will be a kind of hopeful network techology which occupies first place in digit

digital transmission and exchange in the future.