Frame synchronization detection system for time division multiplexed
(TDM) digital signals
    1.
    发明授权
    Frame synchronization detection system for time division multiplexed (TDM) digital signals 失效
    用于时分复用(TDM)数字信号的帧同步检测系统

    公开(公告)号:US4768192A

    公开(公告)日:1988-08-30

    申请号:US33551

    申请日:1987-04-01

    IPC分类号: H04J3/06

    CPC分类号: H04J3/0605

    摘要: A frame synchronization detection system which enables frame synchronization and synchronizing pulses to be provided from at least two formats of DS1 TDM signals, specifically the D4 and extended superframe Fe formats. A first search logic circuit provides an output indicating the onset of a maintenance mode of frame detection when either Fe or D4 patterns are decoded. For the D4 pattern an alternate pattern is decoded and the first search circuit enters the maintenance mode only after both alternate D4 framing patterns are decoded. A second search logic circuit enables the decoding of a subsequent sequence and detection of framing, thereby reducing the probability of false framing. A frame counter which is synchronized upon the detection of a valid framing pattern by the first search circuit continues to supply frame sync pulses until an error detector, which detects whether a predetermined ratio of invalid to valid framing bits occurs, resets the system back to the search mode.

    摘要翻译: 一种帧同步检测系统,其能够从至少两种格式的DS1 TDM信号,特别是D4和扩展超帧Fe格式提供帧同步和同步脉冲。 第一搜索逻辑电路提供指示在对Fe或D4图案进行解码时的帧检测的维护模式的开始的输出。 对于D4模式,仅在两个交替的D4成帧模式被解码之后,替代模式被解码,并且第一搜索电路进入维护模式。 第二搜索逻辑电路使得后续序列的解码和成帧检测成为可能,从而降低了伪成帧的可能性。 在由第一搜索电路检测有效成帧模式时同步的帧计数器继续提供帧同步脉冲,直到检测到无效到有效成帧比特的预定比率是否发生的错误检测器将系统重置为 搜索模式。

    Forward error correction method and system for reliable transmission of real time data over a packet based network
    2.
    发明授权
    Forward error correction method and system for reliable transmission of real time data over a packet based network 有权
    用于基于分组的网络实时数据的可靠传输的前向纠错方法和系统

    公开(公告)号:US06851084B2

    公开(公告)日:2005-02-01

    申请号:US10310514

    申请日:2002-12-05

    IPC分类号: H03M13/09 H04L1/00 H03M13/00

    摘要: A method of correcting errors in a packet based communications system comprises generating m parity packets from each group of k consecutive data packets to form a code word of k data packets and m parity packets. Each parity packet is a combination of two or more data packets, and each data and parity packet includes a sequence number representative of a relative position of the packet in the code word. The method also includes examining, after transmission, the sequence number associated with each packet to determine if one or more packets from the code word is missing. If any packets are missing, the method includes identifying the one or more missing packets. The method further includes processing the data packets and the parity packets according to the combinations of data packets used to generate the parity packets, so as to recover one or more missing packets.

    摘要翻译: 一种校正基于分组的通信系统中的错误的方法包括从每个k个连续数据分组组生成m个奇偶分组,以形成k个数据分组和m个奇偶分组的码字。 每个奇偶校验分组是两个或更多个数据分组的组合,并且每个数据和奇偶分组包括表示分组在代码字中的相对位置的序列号。 该方法还包括在传输之后检查与每个分组相关联的序列号以确定来自代码字的一个或多个分组是否丢失。 如果丢失任何数据包,则该方法包括识别一个或多个丢失的数据包。 该方法还包括根据用于生成奇偶校验分组的数据分组的组合来处理数据分组和奇偶分组,以便恢复一个或多个丢失分组。

    Method and system for encapsulating time division multiplex data into individual packets of a packet based network
    3.
    发明授权
    Method and system for encapsulating time division multiplex data into individual packets of a packet based network 有权
    将时分复用数据封装到基于分组的网络的各个分组中的方法和系统

    公开(公告)号:US08189553B2

    公开(公告)日:2012-05-29

    申请号:US11803300

    申请日:2007-05-14

    CPC分类号: H04J3/0602 H04J3/1623

    摘要: A method of encapsulating TDM data into individual data packets for transmission across a packet network includes delineating the TDM data into one or more signaling multiframes, wherein each signaling multiframe includes one period of a periodic signaling pattern. The method also includes appending a header that is associated with the individual data packets to each of the signaling multiframes of TDM data. Further, a method of selecting the number of multiframes of TDM data in the data packet includes calculating the efficiency of the data packet as a function of the number of multiframes, and selecting the number of multiframes so that the efficiency of the data packet increases exponentially as a number of time-slots in the TDM data increases.

    摘要翻译: 将TDM数据封装到用于在分组网络传输的各个数据分组中的方法包括将TDM数据描绘成一个或多个信令多帧,其中每个信令复帧包括周期性信令模式的一个周期。 该方法还包括将与各个数据分组相关联的报头附加到TDM数据的每个信令多帧。 此外,在数据分组中选择TDM数据的多帧的数量的方法包括根据多帧的数量来计算数据分组的效率,并且选择多个帧的数量,使得数据分组的效率呈指数增长 随着TDM数据中的多个时隙的增加。

    Method and system for encapsulating time division multiplex data into individual packets of a packet based network
    4.
    发明授权
    Method and system for encapsulating time division multiplex data into individual packets of a packet based network 有权
    将时分复用数据封装到基于分组的网络的各个分组中的方法和系统

    公开(公告)号:US07233587B2

    公开(公告)日:2007-06-19

    申请号:US10153265

    申请日:2002-05-22

    IPC分类号: H04L12/28 H04L12/66 H04B7/212

    CPC分类号: H04J3/0602 H04J3/1623

    摘要: A method of encapsulating TDM data into individual data packets for transmission across a packet network includes delineating the TDM data into one or more signaling multiframes, wherein each signaling multiframe includes one period of a periodic signaling pattern. The method also includes appending a header that is associated with the individual data packets to each of the signaling multiframes of TDM data. Further, a method of selecting the number of multiframes of TDM data in the data packet includes calculating the efficiency of the data packet as a function of the number of multiframes, and selecting the number of multiframes so that the efficiency of the data packet increases exponentially as a number of time-slots in the TDM data increases.

    摘要翻译: 将TDM数据封装到用于在分组网络传输的各个数据分组中的方法包括将TDM数据描绘成一个或多个信令多帧,其中每个信令复帧包括周期性信令模式的一个周期。 该方法还包括将与各个数据分组相关联的报头附加到TDM数据的每个信令多帧。 此外,在数据分组中选择TDM数据的多帧的数量的方法包括根据多帧的数量来计算数据分组的效率,并且选择多个帧的数量,使得数据分组的效率呈指数增长 随着TDM数据中的多个时隙的增加。