Method and apparatus for testing a subscriber line group marker

Details Method and apparatus for testing a subscriber line group marker Method and apparatus for testing a subscriber line group marker

1978-06-28

1979-09-25

Brown, Thomas W.

H04M 324

Patent

active

041692217

ABSTRACT:
Disclosed is a method and apparatus adapted to be used in testing a subscriber line group marker, of a telephone central office switching device, wherein such markers are energizable by application of central office battery potential through a normally open path but closed in response to a subscriber's telephone going off hook and/or an incoming call from a distant office. Testing takes place without removing the marker physically from its central office switching environment by essentially eliminating any chance of it being electrically energizable by anyone but the testing party. Such is accomplished by placing the instant of time the marker is to be tested essentially under the sole control of the testing party by:

REFERENCES:
patent: 3555208 (1971-01-01), Arndt

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