Method of testing telephone cable pairs

Details Method of testing telephone cable pairs Method of testing telephone cable pairs

1982-05-06

1984-04-03

Schreyer, Stafford D.

17917525, H04B 346

Patent

active

044409842

ABSTRACT:
The invention provides an improved method of testing conductor pairs in a telephone cable to determine presence or absence of a customer phone, its location relative to a cable throw or test location and the type of service. Certain types of trouble shooting tests can also be made. The improved method involves utilization of a Wheatstone bridge type connection wherein first and second legs have a common connection at one end to the central office direct current voltage source and consist respectively of a conductor of a pair in a first cable and its corresponding half tap conductor in a second cable; wherein a meter is connected between the first and second legs at the cable throw or test location; wherein a third leg comprises a customer telephone or a test pair; and wherein the fourth leg comprises either an open, or selectably either a variable resistance or a variable reactance, or both.

REFERENCES:
patent: 3975600 (1976-08-01), Marston

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