Subscriber line storage system for time division exchange
专利汇可以提供Subscriber line storage system for time division exchange专利检索，专利查询，专利分析的服务。并且PURPOSE:To ensure the effective storage for the exchange subscriber line with no insertion of the two-way repeater and through the gain selection of the variable gain circuit by the control of the change-over switch control circuit in accordance with the transmission loss of the subscriber line. CONSTITUTION:Two sets of signal attenuation circuit ATT1 and ATT1' plus ATT2 and ATT2' are provided at the input/output sides of the A/D and D/A converters. These paired circuits are changed over by coupling switch SW1 and SW2 which operate under control of control circuit CTL, and boosting power source V is added to subscriber circuit LC for the long-distance subscriber. Here, the comparatively large insertion loss is given to the pair of circuit ATT1 and ATT1', and the small loss is given to the pair of ATT2 and ATT2' respectively. Then the gain of variable gain circuit ATT is selected by the control of circuit CTL in accordance with the transmission loss of circuit LC. Thus, the effective storage of the exchange subscriber line is ensured without inserting any two-way repeater.，下面是Subscriber line storage system for time division exchange专利的具体信息内容。
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