Circuit and method for loopback test and on-hook transmission in

Details Circuit and method for loopback test and on-hook transmission in Circuit and method for loopback test and on-hook transmission in

1995-01-30

1997-08-19

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

379 32, 379402, 379412, H04M 124, H04M 100

Patent

active

056595700

ABSTRACT:
A method and circuit for loopback testing a telephone subscriber line interface circuit (SLIC) includes current sources connected to each of tip and ring circuits from which switch-hook is detected in the SLIC. A loopback test of the SLIC is conducted when the telephone is on-hook and is successful when the current from the current sources simulates a switch-hook detection, The current sources may also be used during on-hook transmission. A ground key detect circuit in the SLIC may be used to verify a successful loopback test by using current from the current sources in the ground key detect circuit to check for a grounded ring circuit in the SLIC.

REFERENCES:
patent: 5003573 (1991-03-01), Agah et al.
patent: 5111497 (1992-05-01), Bliven et al.
patent: 5504753 (1996-04-01), Renger et al.
patent: 5515434 (1996-05-01), Cotreau

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