Subscriber line testing system

Details Subscriber line testing system Subscriber line testing system

1981-10-07

1983-07-05

Schreyer, Stafford D.

1791752D, H04B 346, H04M 330

Patent

active

043920268

ABSTRACT:
A system for testing subscriber lines and terminals by leading the subscriber line to the testing system through an associated semiconductor switch of a type driven by a constant current. The system includes a circuit for varying a current fed through the switch from the subscriber line to be tested, a circuit for measuring current values corresponding to the circuit states of the circuit, and a circuit for determining on the basis of the measured values derived from the measuring circuit a current value from which the constant current component for driving the switch is eliminated.

REFERENCES:
patent: 4076971 (1978-02-01), Mukaemachi et al.

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