Subscriber line testing system including exchange...

Details Subscriber line testing system including exchange... Subscriber line testing system including exchange...

H - Electricity

04

B

379/2, 324/58.02

H04B 3/46 (2006.01) H04M 1/24 (2006.01) H04M 3/30 (2006.01)

Patent

CA 1054275

ABSTRACT OF THE DISCLOSURE A testing system for testing an impedance of 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 device in said first and second channels are kept conductive by said constant current source.

260828

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