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    Multiplex transmission and reception system
    3.
    发明公开
    Multiplex transmission and reception system 失效
    多路传输和接收系统

    公开(公告)号：EP0800297A1

    公开(公告)日：1997-10-08

    申请号：EP97302319.5

    申请日：1997-04-04

    申请人： FUJITSU LIMITED

    发明人： Kaku, Takashi ,  Okita, Ryoji

    IPC分类号： H04L27/34 ,  H04L5/00

    CPC分类号： H04L27/3483 ,  H04L5/00

    摘要： A modem signal transmitting/receiving system including a modem signal transmitter (1) and a modem signal receiver (8) connected to each other via a transmission line (17). The modem signal transmitter (1) is operable to transmit by multiplexing an analog signal, such as an audio signal, together with a modem carrier with digital data. The modem signal transmitter (1) includes an analog-to-digital converting unit (2) which converts an analog signal into a digital signal, a demodulating unit (3) which demodulates the digital signal with a predetermined carrier frequency signal, a decimation processing filter (4) which decimates the demodulated signal and a deciding unit (5) which decides a coordinate on a two-dimensional plane for the output from the decimation processing filter (4) and then inputs the decision result to a modem transmitting unit (6). The signal received from the transmission line (7) is subjected to an interpolation process (10), modulated by a modulating unit (11) with a predetermined carrier frequency, converted to an analog signal by a digital-to-analog converting unit (12) and outputted to the analog signal line.

    摘要翻译： 一种调制解调信号发射/接收系统，包括经传输线（17）相互连接的调制解调信号发射机（1）和调制解调信号接收机（8）。 调制解调器信号发射器（1）可操作以通过将诸如音频信号的模拟信号与具有数字数据的调制解调器载波一起多路复用来发送。 调制解调器信号发送器（1）包括将模拟信号转换成数字信号的模数转换单元（2），用预定载频信号解调数字信号的解调单元（3），抽选处理 对抽取处理滤波器（4）的输出进行抽取的抽取滤波器（4）和决定二维平面上坐标的决定单元（5），然后将决定结果输入到调制解调器发送单元（6 ）。 从传输线（7）接收到的信号经过插值过程（10），由调制单元（11）以预定载波频率调制，由数模转换单元（12）转换为模拟信号 ）并输出到模拟信号线。

    Communication line backup system
    4.
    发明公开
    Communication line backup system 失效
    通信线路备份系统

    公开(公告)号：EP0488610A3

    公开(公告)日：1994-01-05

    申请号：EP91310805.6

    申请日：1991-11-25

    申请人： FUJITSU LIMITED

    发明人： Okita, Ryoji

    IPC分类号： H04L1/22 ,  H04B1/74 ,  H04B3/00 ,  H04M11/06

    CPC分类号： H04B1/74 ,  H04Q11/0428

    摘要： A communication line backup system provides a backup line for backing up a communication line (6) which connects first and second subscriber terminals (2, 4). The communication line backup system includes a first backup unit (15) which is coupled to the first subscriber terminal (2), a second backup unit (15) which is coupled to the second subscriber terminal (4), and an integrated services digital network (ISDN) (8) which is coupled to the first and second backup units via ISDN channels. The first and second backup units include a backup part for forming a backup communication channel between the first and second subscriber terminals in response to a failure which is generated on the communication line between the first and second subscriber terminals, and the backup communication channel is formed by at least one channel within the ISDN channels established in the integrated services digital network.

    摘要翻译： 通信线路备用系统提供用于备份连接第一和第二用户终端（2,4）的通信线路（6）的备用线路。 该通信线路备用系统包括耦合到第一用户终端（2）的第一备用单元（15），耦合到第二用户终端（4）的第二备用单元（15），以及综合业务数字网 （ISDN）（8），它通过ISDN信道连接到第一和第二备份单元。 第一和第二备份单元包括备用部分，用于响应于在第一和第二用户终端之间的通信线路上产生的故障而在第一和第二用户终端之间形成备用通信信道，并且形成备用通信信道 通过综合业务数字网络中建立的ISDN信道内的至少一个信道。

    Communication line backup system
    5.
    发明公开
    Communication line backup system 失效
    Übertragungssystemmit einer Reserveleitung。

    公开(公告)号：EP0488610A2

    公开(公告)日：1992-06-03

    申请号：EP91310805.6

    申请日：1991-11-25

    申请人： FUJITSU LIMITED

    发明人： Okita, Ryoji

    IPC分类号： H04L1/22 ,  H04B1/74 ,  H04B3/00 ,  H04M11/06

    CPC分类号： H04B1/74 ,  H04Q11/0428

    摘要： A communication line backup system provides a backup line for backing up a communication line (6) which connects first and second subscriber terminals (2, 4). The communication line backup system includes a first backup unit (15) which is coupled to the first subscriber terminal (2), a second backup unit (15) which is coupled to the second subscriber terminal (4), and an integrated services digital network (ISDN) (8) which is coupled to the first and second backup units via ISDN channels. The first and second backup units include a backup part for forming a backup communication channel between the first and second subscriber terminals in response to a failure which is generated on the communication line between the first and second subscriber terminals, and the backup communication channel is formed by at least one channel within the ISDN channels established in the integrated services digital network.

    摘要翻译： 通信线路备份系统提供用于备份连接第一和第二用户终端（2,4）的通信线路（6）的备用线路。 通信线路备份系统包括耦合到第一用户终端（2）的第一备份单元（15），耦合到第二用户终端（4）的第二备份单元（15）和综合业务数字网 （ISDN）（8），其经由ISDN信道耦合到第一和第二备用单元。 第一和第二备用单元包括用于响应于在第一和第二用户终端之间的通信线路上产生的故障而在第一和第二用户终端之间形成备用通信信道的备用部件（36），备用通信 信道由在综合业务数字网络中建立的ISDN信道内的至少一个信道形成。