| 摘要 |
PROBLEM TO BE SOLVED: To provide a system for reversing circuit polarity of U interface automatically used for automatically reversing circuit polarity of U interface. SOLUTION: The system for automatically reversing circuit polarity of U interface is provided in a line terminal. The line terminal and a digital service unit are connected so as to communicate with U interface. The system is provided with a current detection module, a circuit polarity determination module and a circuit polarity reversal module. The current detection module detects circuit current of U interface. The circuit polarity determination module determines whether the circuit polarity of U interface is correct or not when the circuit current exists. The circuit polarity reversal module reverses the circuit polarity of U interface of the line terminal when the circuit polarity is not correct. COPYRIGHT: (C)2008,JPO&INPIT
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