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    • 2. 发明授权
    • Data integrity guarantee system
    • 数据完整性保证体系
    • US5761405A
    • 1998-06-02
    • US407241
    • 1995-03-20
    • Katsumi TadamuraMasakazu OkadaSyoji Yamaguchi
    • Katsumi TadamuraMasakazu OkadaSyoji Yamaguchi
    • H04L1/22G06F11/14G06F11/20H04L29/10H04L29/14
    • G06F11/1443G06F11/2005G06F11/2007
    • The main storage, the communication interface portion and the circuit control module hold transmission data in the buffers until completion of the transmission has been confirmed. When a fault has occurred in the current operating system of the duplexed portions in the configuration elements of the host computer and the multi-circuit control unit, the duplexed portions are changed over from the current operating system to the stand-by system. In this case, information for reproducing data that has been lost due to the change-over is transmitted from the main storage and the circuit control module to the communication interface portion which has become the new current operating system. The communication interface portion which has become the new current operating system restarts the processing based on this information. Data integrity is guaranteed for the data of both directions of transmission and receiving between the host computer and the terminal without mutually confirming the state of data communications before the occurrence of the fault between the terminal and the host computer after the occurrence of the fault. Information exchanges of layer 3 or above are not carried out between the host computer and the terminal. Therefore, overhead of data communications can be minimized.
    • 主存储器,通信接口部分和电路控制模块保持缓冲器中的传输数据,直到传输完成已被确认为止。 当在主计算机和多电路控制单元的配置元件中的双工部分的当前操作系统中发生故障时,双工部分从当前操作系统切换到备用系统。 在这种情况下,用于再现由于转换而丢失的数据的信息从主存储器和电路控制模块发送到已经成为新的当前操作系统的通信接口部分。 已经成为新的当前操作系统的通信接口部分基于该信息重新启动处理。 数据完整性保证主机与终端之间的传输和接收两个方向的数据,而不会在发生故障之后在终端和主机之间的故障发生之前相互确认数据通信的状态。 第三层以上的信息交换不能在主机与终端之间进行。 因此,可以最小化数据通信的开销。
    • 9. 发明授权
    • Data communication apparatus having communication-mode changeover
function and method of data communication between data communication
stations having the same
    • 具有通信模式切换功能的数据通信装置和具有该通信模式切换功能的数据通信站之间的数据通信方法
    • US5157662A
    • 1992-10-20
    • US654196
    • 1991-02-12
    • Katsumi TadamuraKeiichi Nakane
    • Katsumi TadamuraKeiichi Nakane
    • H04L29/02H04L12/64H04L29/06H04L29/08H04Q11/04
    • H04Q11/0428
    • In an ISDN network, data communications can be performed in two communication modes corresponding to line and packet switchings in the same network. The line switching is effective in transmitting mass data to a receiving station and receiving the same therefrom at high speed, and accounting is made to a period of time required for communication in a public network. On the other hand, the packet switching is effective in transmitting low-speed data or small amounts of data produced in a discrete manner, and accounting is made to the amount of transmitted data in the public network.With a valve toward making efficient use of the two communication modes, the present invention relates to a data communication apparatus of the type wherein the two communication modes are changed as needed so as to perform data communications, and to a data communication system suitable for use with the data communication apparatus. In other words, a means for performing data communication continuously over two calls is provided so as to change one communication mode to another under data communication based on a user's request.Thus, when the amount of creation of data varies appreciably under communication, data communication is made based on the optimal communication mode determined according to the amount of creation of the data.
    • 在ISDN网络中,可以在对应于同一网络中的线路和分组交换的两种通信模式中执行数据通信。 线路切换在将质量数据传送到接收站并且以高速接收它们的同时有效,并且计算到公共网络中通信所需的时间段。 另一方面,分组交换在传输低速数据或以离散方式产生的少量数据时是有效的,并且对公共网络中的传输数据的量进行计费。 利用有效利用两种通信模式的阀门,本发明涉及一种数据通信设备,其中根据需要改变两种通信模式以执行数据通信,并且涉及适合于使用的数据通信系统 与数据通信装置。 换句话说,提供了一种用于通过两次呼叫连续执行数据通信的装置,以便根据用户的请求在数据通信下将一种通信模式改变为另一种通信模式。 因此,当数据的创建量在通信中变化明显时,基于根据数据的创建量确定的最佳通信模式进行数据通信。