Interference insensitive line supervision circuit

Details Interference insensitive line supervision circuit Interference insensitive line supervision circuit

1978-01-12

1979-06-12

Robinson, Thomas A.

H04M 322, H04B 346

Patent

active

041581091

ABSTRACT:
Interference insensitive line supervision circuit for subscriber's line having a given working range for the line potentials. A call can be simulated by the occurrence of overvoltages. Means are applied which supervise the occurrence of overvoltages. In the case of overvoltages these means produce control signals which result in that the state of a line state store cannot be affected by the line supervision circuit.

REFERENCES:
patent: 4022980 (1977-05-01), Kitajewski et al.
patent: 4079208 (1978-03-01), Rogers et al.

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