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    DIGITAL TRANSMISSION SYSTEM AND DIGITAL TRANSMISSION METHOD
    1.
    发明公开
    DIGITAL TRANSMISSION SYSTEM AND DIGITAL TRANSMISSION METHOD 审中-公开

    公开(公告)号：EP3493433A1

    公开(公告)日：2019-06-05

    申请号：EP18215726.3

    申请日：2008-01-16

    申请人： Nippon Telegraph and Telephone Corporation ,  NTT Electronics Corporation

    发明人： KISAKA, Yoshiaki ,  OHARA, Takuya ,  AISAWA, Shigeki ,  MIYAMOTO, Yutaka ,  TAKEI, Kazuhito ,  ENDOH, Yasuyuki ,  MIURA, Katsuyoshi ,  NIKAIDO, Tadanobu ,  TOMIZAWA, Masahito

    IPC分类号： H04J3/00 ,  H04L1/00 ,  H04L29/08

    摘要： A digital transmission system (1403-1409) includes a rate adjusting means (1403, 1404) for adjusting the bit rate of a plurality of types of client signals to a bit rate range that can be accommodated in a digital frame transparently by inserting a dummy pattern, comprising a frame synchronization pattern, using a specific fixed frame, into the fixed frame for client signals other than the client signal having the highest bit rate among the plurality of types of client signals to increase the bit rate of the client signals. The number of bits of the dummy pattern and the number of bits of the client signal before the rate adjustment results in a rate M:N (where M and N are natural numbers) to construct the specific fixed frame, and the values N and M are set so that (Bc ±Ac) x (M + N)/N results in a bit rate range that can be accommodated in the digital frame, where the bit rate and the frequency accuracy of the client signal are Bc and ±Ac, respectively, wherein the dummy pattern of M bits is inserted to every N bits of the client signals.
    The digital transmission system (1403-1409) further comprises rate restoring means (1408, 1409) for restoring the rate to an original bit rate of a client signal by discriminating the dummy pattern area using the frame synchronization pattern and deleting the dummy pattern on a receiver side.

    OPTICAL DIGITAL TRANSMISSION SYSTEM
    5.
    发明公开
    OPTICAL DIGITAL TRANSMISSION SYSTEM 有权
    OPTISCHESDIGITALÜBERTRAGUNGSSYSTEM

    公开(公告)号：EP2348654A1

    公开(公告)日：2011-07-27

    申请号：EP09825930.2

    申请日：2009-11-13

    申请人： Nippon Telegraph And Telephone Corporation ,  NTT Electronics Corporation

    发明人： AISAWA, Shigeki ,  TOMIZAWA, Masahito ,  MIYAMOTO, Yutaka ,  KISAKA, Yoshiaki ,  ENDO, Yasuyuki ,  MIURA, Katsuyoshi ,  TAKEI, Kazuhito

    IPC分类号： H04J3/00

    CPC分类号： H04J3/1652 ,  H04J3/076 ,  H04J2203/0089

    摘要： An optical digital transmission system of the present invention newly defines one second negative stuff byte in an overhead area for accommodation of the client signals with multiplexing into the OTU frame, newly defines one third positive stuff byte in a corresponding tributary slot in a payload area for accommodation of client signals with multiplexing, newly defines stuff control bits that is used for decision of the use of the second negative stuff byte and the third positive stuff byte in three different places in the overhead area for client signal accommodation with multiplexing, performs control by using the newly defined stuff control bits when accommodation of the client signal with the third positive stuff byte or the second negative stuff byte is required, and performs stuff control without using the newly defined stuff control bits when accommodation of the client signal by the third positive stuff byte and the second negative stuff byte is not required.

    摘要翻译： 本发明的光数字传输系统新定义了用于将客户端信号复用到OTU帧中的开销区域中的一个第二负填充字节，新定义了有效载荷区域中相应支路时隙中的三分之一正填充字节 客户端信号采用多路复用，新定义了用于决定使用第二负填充字节和第三正填充字节的填充控制位，用于客户端信号调制的开销区域中的三个不同位置进行多路复用，执行控制 当需要用第三正填充字节或第二负填充字节调节客户端信号时使用新定义的填充控制位，并且在将客户端信号调节到第三正值时，不使用新定义的填充控制位执行填充控制 填充字节和第二个负面填充字节不是必需的。