Telephone exchange signalling unit

Details Telephone exchange signalling unit Telephone exchange signalling unit

1977-09-20

1978-12-12

Olms, Douglas W.

H04M 322

Patent

active

041297563

ABSTRACT:
A telephone exchange signalling unit is provided having looping means for feeding back and comparing transmitted data multiplets directly with its input data. This test is ordered by the control unit of the telephone exchange without the necessity of using wires other than the distribution and scan wires of the telephone exchange and the signalling unit.

REFERENCES:
patent: 3743938 (1973-07-01), Davis
patent: 3931476 (1976-01-01), Matthews
patent: 3985972 (1976-10-01), Rolin et al.
patent: 4002847 (1977-01-01), Dail
patent: 4039751 (1977-08-01), Couturier et al.

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