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BIT ERROR RATE TESTING SYSTEM FOR DIGITAL SUBSCRIBER LINE
BIT ERROR RATE TESTING SYSTEM FOR DIGITAL SUBSCRIBER LINE
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机译：数字用户线误码率测试系统
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摘要
PURPOSE:To attain preventive maintenance for bit error rate test by providing an insulation resistance test circuit connecting line A-earth, line B-earth and between lines A-B to a test line of an intra-office line termination circuit via a DC resistor. CONSTITUTION:In closing a switch 8 in the insulation resistor test circuit 7, the lines A, B of the testlines are connected via the DC resistors as line A-earth, line B-earth and between lines A-B. As a result, the insulation resistance 13 of the digital subscriber line 4 is decreased by the connection of a DC resistor 9. In selecting the DC resistance properly and conducting the bit error rate test, the bit error rate of the digital subscriber line 4 whose insulation resistance 13 is not lowered is almost unchanged because the threshold margin of a test pulse is ensured sufficiently by the combined resistance. Thus, the preventive maintenance in the bit error rate test is attained.
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