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    • 91. 发明授权
    • Data communication apparatus
    • 数据通信装置
    • US5721731A
    • 1998-02-24
    • US590171
    • 1996-01-23
    • Takehiro Yoshida
    • Takehiro Yoshida
    • H04N1/32H04N1/333H04B3/20
    • H04N1/33346H04N1/32619H04N1/33323H04N1/33361H04N1/33369H04N2201/3335H04N2201/33364
    • When a protocol signal by a full duplex communication is transmitted and received, an error termination due to the disabling of the full duplex communication in the course of the communication is minimized. When an acknowledge signal is not received within a predetermined period from the start of the sending of the protocol signal by a modem to a destination station, a control circuit switches the protocol from the execution of the V.8 or V.34 protocol by the full duplex communication to the execution of the V.21 protocol of the T.30 and continues the image communication. Further, when the protocol signal is transmitted and received by the full duplex communication, the error termination due to the disabling of the full duplex communication in the course of the communication is minimized. When the acknowledge signal is not received within the predetermined period from the start of the sending of the protocol signal to the destination station, the execution of the V.8 or V.34 protocol by the full duplex communication is terminated in error and the image communication is executed at redialing by the V.21 protocol of the T.30.
    • 当通过全双工通信的协议信号被发送和接收时,由于在通信过程中禁止全双工通信而导致的错误终止被最小化。 当从调制解调器向目标站发送协议信号开始的预定时间段内没有接收到确认信号时,控制电路将协议从V.8或V.34协议的执行切换到 全双工通信,执行T.30的V.21协议,并继续进行图像通信。 此外,当通过全双工通信发送和接收协议信号时,由于在通信过程中禁止全双工通信而导致的错误终止被最小化。 当在从协议信号发送开始到目标站的预定时间内没有接收到确认信号时,通过全双工通信的V.8或V.34协议的执行被错误地终止,并且图像 通过T.30的V.21协议重新进行通信。