Analog self-test circuitry for a trunk interface

Details Analog self-test circuitry for a trunk interface Analog self-test circuitry for a trunk interface

1995-12-27

1998-06-02

Kuntz, Curtis

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of trunk or long line

379 10, 379 15, 379 29, H04M 124, H04M 308, H04M 322

Patent

active

057612730

ABSTRACT:
An integrated circuit is provided for a trunk interface which can test a trunk interface card. Switching circuitry couples tip and ring leads to signal detection circuitry which detects the typical ring and lead signal information. During testing, a test signal is generated which causes the detection circuitry to be coupled to sets of simulated ring and tip test signals which can test the functionality of the integrated circuit and the signal detection circuitry.

REFERENCES:
patent: 4679224 (1987-07-01), Lynch et al.
patent: 4937851 (1990-06-01), Lynch et al.
patent: 5157708 (1992-10-01), Garthwaite et al.
patent: 5598455 (1997-01-01), Bliven et al.

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