Devices for transmission, switching, and termination of communications signals, such as data terminals, modems, acoustic couplers, private branch exchange (PBX) equipment, store and forward message switching computers, etc.; 用于傳輸、交換和終止通信信號(hào)的設(shè)備。例如數(shù)據(jù)終端、調(diào)制解調(diào)器、聲音耦合器、專用小交換機(jī)(PBX)設(shè)備、存儲(chǔ)轉(zhuǎn)發(fā)報(bào)文的交換計(jì)算機(jī)等。