1)repeater exchanger,中继交换机2)junction line of PBX,用户小交换机中继线3)frame relay switching,帧中继交换4)transit switching,中继交换台5)trunking switchboard,长途交换台;长途交换机中继台6)frogging repeater,换频中继机
用法和例句
Mainly we probed into the system structure and frame format of frame relay switching and data communication in this paper.