公开(公告)号：US4945555A

公开(公告)日：1990-07-31

申请号：US418241

申请日：1989-10-06

Applicant: Christopher R. Teumer ,  Mark A. Mendes

Inventor： Christopher R. Teumer ,  Mark A. Mendes

IPC: H04M3/30 ,  H04Q1/14 ,  H04Q1/446

CPC classification number: H04M3/30 ,  H04M3/308 ,  H04M2201/02 ,  H04M2201/38 ,  H04Q1/14 ,  H04Q1/446

Abstract: A pair of unused telephone lines are connected together at a telephone office main frame by a device which is removably plugged in the main frame to connect a diode between said lines. At a point remote from the central office a testing circuit, which comprises a battery in series with a tone emitter, is releasably connected across the lines first with one polarity with respect to the lines, and then with the opposite polarity. If a tone is emitted for only one connection but not the other, the lines should be in working order.

Abstract translation: 一对未使用的电话线通过可移除地插入主框架中的装置在电话局主框架处连接在一起，以在所述线路之间连接二极管。 在远离中心局的点上，包括与音调发射器串联的电池的测试电路首先以相对于线路的一个极性首先可释放地连接，然后以相反的极性可释放地连接。 如果只发出一个连接而不是另一个连接的音调，那么这些线应该是正常的。