| 摘要 |
An apparatus for testing the racks and installation wiring of telephone switch equipment takes the form of a module capable of insertion into the various slots of a particular rack configuration. The module includes a circuit board which terminates in a connector suitable for interconnection with a particular telephone switch system, and which receives a continuity testing subassembly useful in performing the desired testing. To this end, selected contacts (or pins) of the connector are coupled with a light emitting diode (LED) and a biasing circuit for operating the LED responsive to connection of the biasing circuit to ground. Each LED, and the biasing circuit, is provided with a suitable operating voltage which can either be derived from the rack which is being tested or a battery which is resident in the test apparatus. Also a corresponding method for testing the continuity of a particular wired connection, using the test apparatus, by touching the terminating end of the connection to ground using an appropriate probe or jumper which is electrically coupled with the frame of the rack. The test circuit is capable of being switched between different configurations which are appropriate for testing wired connections associated with different slots of the rack system, preferably automatically and responsive to the particular slot of the rack system which receives the test apparatus.
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