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    • 5. 发明授权
    • Network termination device with automatic detection and correction of circuit polarity
    • 具有自动检测和校正电路极性的网络终端设备
    • US06320940B1
    • 2001-11-20
    • US09394770
    • 1999-09-10
    • Masakazu Oi
    • Masakazu Oi
    • H04M124
    • H04Q11/0442H04Q2213/1308H04Q2213/1319H04Q2213/13203H04Q2213/13209H04Q2213/13213H04Q2213/13216H04Q2213/13297H04Q2213/13305H04Q2213/1332H04Q2213/1336
    • A network termination device which will operate correctly even if its connection to a central office has reverse polarity. A network termination device at customer premises is connected to a line termination device located at a central office via a two-wire subscriber loop. If this connection was made with reverse polarity, the supply voltage provided by the line termination device would oscillate at specific intervals, alternating between normal polarity and reverse polarity. In such a case, a polarity switch controller in the network termination device directs its local polarity reversing switch to alternate the polarity at predetermined intervals longer than the cycle time of the above oscillation. This produces such a situation where a reverse supply voltage is present and the polarity reversing switch is in reverse mode, resulting in correct polarity as a whole. Under this condition, frame synchronization can be achieved between the peer devices, and a circuit termination unit thus asserts a synchronization indication signal. Upon receipt of this signal, the polarity switch controller commands the polarity reversing switch to stop changing and hold the current polarity. Eventually, a normal connection path is restored between the two devices, despite of the reversed subscriber loop wiring.
    • 即使连接到中心局的网络终端设备也能正常工作,因此具有相反的极性。 客户住宅处的网络终端设备通过两线用户环路连接到位于中心局的线路终端设备。 如果以相反极性进行连接,则线路终端装置提供的电源电压将以特定间隔振荡,在正常极性和反向极性之间交替。 在这种情况下,网络终端装置中的极性开关控制器指示其本地极性反转开关以比上述振荡的周期时间更长的预定间隔交替极性。 这产生了存在反向电源电压并且极性反转开关处于反向模式的情况,从而导致整体上的正确极性。 在这种情况下,可以在对等设备之间实现帧同步,并且电路终端单元因此断言同步指示信号。 在接收到该信号时,极性开关控制器命令极性反转开关停止变化并保持电流极性。 最终,两个设备之间恢复正常的连接路径,尽管用户环路接线反向。
    • 7. 发明授权
    • Subscriber terminating equipment
    • 用户端接设备
    • US06778489B1
    • 2004-08-17
    • US09723581
    • 2000-11-28
    • Kazuyoshi MaruyamaMasakazu Oi
    • Kazuyoshi MaruyamaMasakazu Oi
    • G01R3108
    • H04M3/005H04M3/12
    • The invention provides a subscriber terminating equipment wherein a subscriber accommodated in a subscriber terminating package with which a fault occurs is switched to a relief package by constructing the same such that a common section selects a pair of subscriber terminating packages including a first subscriber terminating package and a second subscriber terminating package and allocates, if the first subscriber terminating package fails, the second subscriber terminating package as a bypass package for performing electric connection between a subscriber terminal and the relief package. The subscriber terminating equipment thus allows automatic switching of the relief package without using a switching package for exclusive use and allows replacement of the fault package without interrupting communication of a subscriber accommodated in the fault package.
    • 本发明提供了一种用户终端设备,其中容纳在发生故障的用户终端包中的用户通过构建它来切换到安全包,使得公共部分选择一对用户终端包,其包括第一用户终端包和 第二用户终止包,并且如果第一用户终止包失败,则将第二用户终端包作为用于在用户终端和救援包之间进行电连接的旁路包来分配。 因此,用户终端设备允许自动切换救援包,而不使用专用的交换包,并且允许更换故障包,而不会中断故障包中容纳的用户的通信。