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据《The Electronic System Design Magazine》1988年2月刊报道:由美国得克萨斯州Cryptek/Datentechnik公司推出的话音/数据Modem可通过内装电路(TAD—PLUS),以19.2kbaud的速率同时传送话音和数据。这种Modem能提供全双工数据
According to The Electronic System Design Magazine, February, 1988, the voice / data modem introduced by Cryptek / Datentechnik in Texas, USA, transmits voice and data simultaneously at 19.2kbaud using the built-in circuit (TAD-PLUS) This Modem can provide full-duplex data