| 摘要 |
PURPOSE: A subscriber board simulator for testing a line is provided to easily test whether a power supply is normally supplied from a switch after connecting the switch and photosubscriber system in 2W method without a real subscriber board. CONSTITUTION: Relays(431a,431b) connects or interrupts 2W line to a subscriber board. A line transformer(432) interrupts the high frequency transmitted through the 2W line. A first hybrid integrated circuit element(433) is connected with the line transformer for interfacing impedance. A subscriber line interface part(434) is connected with the first hybrid integrated circuit element for limiting a loop current of the subscriber line. A second hybrid integrated circuit element(435) is connected with the subscriber line interface part for interfacing input and output signal.
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