Apparatus for controlling and indicating the integrity of the co

Details Apparatus for controlling and indicating the integrity of the co Apparatus for controlling and indicating the integrity of the co

1980-12-29

1982-05-25

Robinson, Thomas A.

1791753R, H04B 346, H04M 326

Patent

active

043318436

ABSTRACT:
A system is shown for automatically detecting the integrity of telephone subscriber's line connection to a four wire switching system via a hybrid network.

REFERENCES:
patent: 4139745 (1979-02-01), Ashdown et al.

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