数据通信系统及供其使用的设备

    公开(公告)号:CN1097930C

    公开(公告)日:2003-01-01

    申请号:CN94108190.7

    申请日:1994-07-05

    Inventor: 濑户贤一

    CPC classification number: H04L25/40 G06F13/423 H04L1/247

    Abstract: 一种数据通信系统,包括带第一微机的主设备和带第二微机的操作设备。两设备经第一和第二线彼此连接。两设备的输入中断端连到第二线。一设备通过将第二线拉至第一电平而开始发送数据,由另一设备检测这情况而经第一线发回信号然后两设备启动内部计时器。当对应于待发送数据项经过一预定时间时,该发送装置将第二线再拉至第一电平。这由另一设备检测经过的时间并用其确定考虑了预定变换规则发出的给定时间与数据元间关系的数据项。

    数据通信系统及供其使用的设备

    公开(公告)号:CN1100861A

    公开(公告)日:1995-03-29

    申请号:CN94108190.7

    申请日:1994-07-05

    Inventor: 濑户贤一

    CPC classification number: H04L25/40 G06F13/423 H04L1/247

    Abstract: 一种数据通信系统,包括带第一微机的主设备和带第二微机的操作设备。两设备经第一和第二线彼此连接。两设备的输入中断端连到第二线。一设备通过将第二线拉至第一电平而开始发送数据,由另一设备检测这情况而经第一线发回信号然后两设备启动内部计时器。当对应于待发送数据项经过一预定时间时,该发送装置将第二线再拉至第一电平。这由另设备检测经过的时间并用其确定考虑了预定变换规则发出的给定时间与数据元间关系的数据项。

    Apparatus for detecting error in a communications line
    7.
    发明授权
    Apparatus for detecting error in a communications line 失效
    用于检测通信线路中的错误的装置

    公开(公告)号:US5504761A

    公开(公告)日:1996-04-02

    申请号:US222482

    申请日:1994-04-05

    CPC classification number: H03M5/18 H03M13/31 H04L1/247 H04L25/4925

    Abstract: Error detection apparatus for a communications line includes an even/odd detection unit for detecting whether an even number of bipolar pulses or an odd number of bipolar pulses occur between a first pulse (violation pulse) interrupting an alternating pattern of bipolar pulses and a second pulse (violation pulse), and an output unit which determines that there is a line error in a target block defined by the first and second violation pulses when a detection result of the even/odd detection unit indicates an even number, wherein the first and second violation pulses occur in a code sequence in accordance with a predetermined coding scheme.

    Abstract translation: 用于通信线路的错误检测装置包括偶数/奇数检测单元,用于检测在中断双极性脉冲的交替模式的第一脉冲(违反脉冲)和第二脉冲之间是否发生偶数个双极性脉冲或奇数个双极性脉冲 (违规脉冲),以及输出单元,当偶数/奇数检测单元的检测结果指示偶数时,确定在由第一和第二违反脉冲定义的目标块中存在线路误差,其中第一和第二 根据预定的编码方案,在码序列中出现违反脉冲。

    Apparatus for word synchronization in an optical communication system
    8.
    发明授权
    Apparatus for word synchronization in an optical communication system 失效
    光通信系统中字同步的装置

    公开(公告)号:US4006304A

    公开(公告)日:1977-02-01

    申请号:US639374

    申请日:1975-12-10

    CPC classification number: H04L1/247 H04L7/04 H04L7/027

    Abstract: An optical communication system is disclosed in which a bipolar signal of the type transmitted in digital transmission systems is converted into a unipolar binary signal for transmission over an optical transmission medium. The three levels of the bipolar signal are converted into three pairs of bits in the binary signal. One pair of bits is not utilized in the conversion and is therefore labeled as a forbidden word. Synchronization is achieved at the receiving location for the purpose of decoding by detecting the presence of the forbidden word in the binary signal and in response to this detection an energizing pulse is produced. This energizing pulse drives a clock circuit which in turn drives a decoding apparatus utilized to translate the binary signal back into the bipolar signal. As a result of this type of word synchronization, individual errors introduced into the binary signal do not result in a framing error.

    Abstract translation: 公开了一种光通信系统,其中在数字传输系统中传输的类型的双极信号被转换成用于在光传输介质上传输的单极二进制信号。 双极信号的三个电平在二进制信号中被转换成三对位。 转换中没有使用一对位,因此被标记为禁止字。 为了通过检测二进制信号中的禁止字的存在而在接收位置实现同步,并且响应于该检测,产生通电脉冲。 该激励脉冲驱动时钟电路,该时钟电路又驱动用于将二进制信号转换回双极性信号的解码装置。 作为这种类型的字同步的结果,引入二进制信号的各个错误不会导致成帧错误。

    Cable pair testing arrangement
    9.
    发明授权
    Cable pair testing arrangement 失效
    电缆对测试安排

    公开(公告)号:US3906174A

    公开(公告)日:1975-09-16

    申请号:US41648073

    申请日:1973-11-16

    CPC classification number: H04L1/247 H04L1/24

    Abstract: A pseudo-random, pseudo-ternary pulse train, which is representative of a PCM signal, is applied to one end of a cable pair. At the other end of the cable pair, the received pulse train is equalized and amplified to obtain a pulse train output in which pulses have very nearly the same peak amplitude as each transmitted pulse, plus a characteristic which is similar but not identical. A variable amplitude interfering tone is combined with the equalized and amplified received pulse train. If no errors are determined by an error detector with a 0 amplitude interfering tone, the amplitude is increased until errors occur. The interfering amplitude control is calibrated in terms of eye degradation factor. The magnitude of the eye degradation factor is determinative of the capability of the cable pair to transmit the PCM signal with an acceptable error rate.

    Abstract translation: 将代表PCM信号的伪随机,伪三元脉冲串应用于电缆对的一端。 在电缆对的另一端,所接收的脉冲串被均衡并被放大以获得脉冲串输出,其中脉冲具有与每个发射脉冲几乎相同的峰值振幅,加上类似但不相同的特性。 可变幅度干扰音与均衡和放大的接收脉冲串组合。 如果没有错误由具有0幅度干扰音的误差检测器确定,则振幅增加直到发生错误。 干扰幅度控制是根据眼睛退化因子进行校准的。 眼睛衰退因子的大小决定了电缆对以可接受的错误率传输PCM信号的能力。

    NETWORK INTERFACE UNIT REMOTE TEST PATTERN GENERATION
    10.
    发明申请
    NETWORK INTERFACE UNIT REMOTE TEST PATTERN GENERATION 审中-公开
    网络接口单元远程测试模式生成

    公开(公告)号:WO1995015630A1

    公开(公告)日:1995-06-08

    申请号:PCT/US1994012855

    申请日:1994-11-08

    Abstract: A system for isolating the direction of communication errors in the local loop of a digital data network is described. A Network Interface Unit (NIU) located at the customer premises typically has a loopback feature, allowing for Bit Error Rate Tests (BERT) to be performed on the local loop from a remote test system located on the data network. The NIU loopback test isolates transmission problems at the customer premises from problems on the local loop. The present invention adds test pattern generation capability to the NIU, allowing the remote test system to determine whether the transmission problem on the local loop is in the network to customer premises direction or in the customer premises to network direction.

    Abstract translation: 描述了用于隔离数字数据网络的本地环路中的通信错误的方向的系统。 位于客户驻地的网络接口单元(NIU)通常具有环回功能,允许在位于数据网络上的远程测试系统的本地环路上执行误码率测试(BERT)。 NIU环回测试将客户端的传输问题与本地环路上的问题隔离开来。 本发明向NIU添加测试模式生成能力,允许远程测试系统确定本地环路上的传输问题是否在网络中到客户驻地方向或者在客户驻地到网络方向。

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