Test method for line equipment including a hybrid circuit...

Details Test method for line equipment including a hybrid circuit... Test method for line equipment including a hybrid circuit...

2011-03-15

2011-03-15

Sing, Simon (Department: 2614)

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

C379S378000, C379S380000, C379S381000, C379S382000, C379S022000, C379S027010

Reexamination Certificate

active

07907720

ABSTRACT:
The invention relates to methods for testing analog telephone line equipment including, in particular to detect faults in their hybrid resistor arrays.It consists in isolating the equipment from the telephone line and then applying the normal ringing signal to it. If the resistor array is defective, the output logic signal of the off-hook/on-hook detector circuit comprises a succession of 0 and 1 at the frequency of the ringing signal, which indicates the fault.This makes it possible to eliminate the equipment test relay usually employed.

REFERENCES:
patent: 5881129 (1999-03-01), Chen et al.
patent: 6219417 (2001-04-01), Zhou
patent: 2002/0094077 (2002-07-01), Kunisch
patent: 2005/0250351 (2005-11-01), Lantoine et al.
patent: 0 352 040 (1990-01-01), None
patent: 0 808 053 (1997-11-01), None
patent: 1 107 552 (2001-06-01), None

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