Service generator checking apparatus

Details Service generator checking apparatus Service generator checking apparatus

1977-01-26

1978-01-31

Stewart, David L.

1791752R, H04M 346

Patent

active

040717046

ABSTRACT:
Service generator checking apparatus and a method in a telephone system operating in time frames each consisting of time slots. The apparatus sends a tone sample signal in one frame through a system interface having an input portion and an output portion, and compares the sent tone sample signal with a stored sample in a subsequent frame, thereby verifying that the interface is operational.

REFERENCES:
patent: 3787628 (1974-01-01), Van Dijk
patent: 3823269 (1974-07-01), Saito
patent: 3985965 (1976-10-01), Field
patent: 4022979 (1977-05-01), Smith

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