Loop detection signal issuing circuit in subscriber circuit havi

Details Loop detection signal issuing circuit in subscriber circuit havi Loop detection signal issuing circuit in subscriber circuit havi

1995-09-12

1997-08-26

Kuntz, Curtis

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

With blocking of normal usage

379 1, 379 27, 379 34, H04M 124, H04M 308, H04M 322

Patent

active

056617771

ABSTRACT:
A circuit for issuing a loop detection signal in a subscriber circuit which sends information in the form of an AC signal to a subscriber while applying a bias voltage to the subscriber line by an on-hook transmission signal during idle intervals of a ringer output to the subscriber and, at the same time, varies the threshold value of loop detection at the loop detection circuit, wherein provision is made of a masking unit which controls whether to issue the loop detection signal SCN from the loop detection circuit without a mask or to mask that SCN according to the masking signal ms, an SCN supervisory unit which supervises the loop detection signal SCN and applies a masking signal ms masking the loop detection signal SCN appearing immediately after the restoration of the on-hook transmission signal as the erroneous detection signal to the masking unit; and a masking time setting unit which sets the time length of the masking signal ms and applies the reset signal rs for the masking signal to the SCN supervisory unit after an elapse of that time.

REFERENCES:
patent: 5289537 (1994-02-01), Yamamoto et al.
patent: 5446786 (1995-08-01), Shtulman
patent: 5570418 (1996-10-01), Wu et al.

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