Telephone signalling test system

Details Telephone signalling test system Telephone signalling test system

1978-05-17

1979-08-21

Robinson, Thomas A.

H04M 322

Patent

active

041654501

ABSTRACT:
Telephone signalling test apparatus is provided for monitoring telephone lines under live traffic conditions. The apparatus is modular with a main frame having a line interface and central control and storage unit, as well as numerical display.

REFERENCES:
patent: 3917915 (1975-11-01), Karras
patent: 4117278 (1978-09-01), Ehrlich et al.

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