Subscriber line testing system

Details Subscriber line testing system Subscriber line testing system

1976-09-08

1978-02-28

Olms, Douglas W.

179 18A, H04B 346

Patent

active

040769712

ABSTRACT:
A testing system for testing an impedance of a subscriber line by connecting a test circuit to the subscriber line through one of channels in a network including current self-holding semiconductor switching devices, wherein a series circuit of a second channel and a constant current source is connected in parallel with said first-mentioned channel whereby the current self-holding semiconductor switching devices in said first and second channels are kept conductive by said constant current source.

REFERENCES:
patent: 3891838 (1975-06-01), Herr et al.

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