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公开(公告)号：US4631719A
公开(公告)日：1986-12-23
申请号：US599872
申请日：1984-04-13
摘要： When a digital muldem employs protective switching, a requirement exists to perform revertive switching. The present disclosure illustrates a way to test the failed module after a switch to determine whether the module is actually failed or the decision to switch was based on momentary external conditions. The test is accomplished by looping back the "failed" module, passing data from one of the operative channels through the "failed" module and doing a bit by bit compare of input and output data for identity. If all of the muldems convert signals to a common frequency, only a single compare circuit need be used on a multiplexed basis.
摘要翻译： 当数字Muldem采用保护切换时，需要执行反向切换。 本公开示出了在切换之后测试故障模块以确定模块是否实际失败或者切换决定是基于瞬时外部条件的方式。 测试通过循环“失败”模块来实现，从一个操作通道传递数据通过“失败”模块，并对标识的输入和输出数据进行逐位比较。 如果所有的muldems将信号转换为公共频率，则仅需要在多路复用的基础上使用单个比较电路。
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2.发明授权Method of and apparatus for checking datapath failure in a communication muldem 失效在通信模块中检查数据通路故障的方法和装置
公开(公告)号：US4601028A
公开(公告)日：1986-07-15
申请号：US621397
申请日：1984-06-18
CPC分类号： H04J3/14
摘要： Actual customer data is routed through a composite muldem which comprises a high speed section and a plurality of low speed sections with the signals being switched or transferred between the high speed and low speed sections all at a common frequency. This same customer data is then tested by a bit by bit comparison circuit which tests the data after it is split, rerouted in various datapath configurations and compared in a logical fashion to first detect datapath failure and then isolate the failure to a specific part of the composite muldem by a set of logical deductions.
摘要翻译： 实际的客户数据通过包括高速部分和多个低速部分的复合模块路由，其中信号在高速和低速部分之间以公共频率切换或传送。 然后，这个相同的客户数据通过逐位比较电路进行测试，该电路在分割数据后进行测试，在各种数据路径配置中重新路由，并以逻辑方式进行比较，以首先检测数据路径故障，然后将故障隔离到特定部分 复合muldem通过一组逻辑推导。
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公开(公告)号：US4627071A
公开(公告)日：1986-12-02
申请号：US670432
申请日：1984-11-09
CPC分类号： H04L1/206
摘要： Method and apparatus for displaying measures of distortion present at the outputs of a quadrature demodulator. From each of the in-phase and quadrature channels of the demodulator there are acquired n parallel bits, m of these bits being the demodulator data output of the associated channel and (n-m) bits being error bits for the channel. The n bits for each channel are converted to a signal acceptable to a plot display device and applied to orthogonal axes of the device. In addition, an absolute value of the (n-m) error bits for each channel is derived. This absolute value is filtered and displayed, as by a meter, for each channel.
摘要翻译： 用于显示在正交解调器的输出处存在的失真度量的方法和装置。 从解调器的每个同相和正交通道中获取n个并行位，这些位中的m是相关通道的解调器数据输出，（n-m）位是通道的错误位。 每个通道的n位被转换为绘图显示设备可接受的信号，并应用于设备的正交轴。 另外，导出每个通道的（n-m）个误差位的绝对值。 对于每个通道，该绝对值按照仪表进行过滤和显示。
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