Self-adjusting telephone line status detection indication

Details Self-adjusting telephone line status detection indication Self-adjusting telephone line status detection indication

1992-10-22

1998-04-21

Kuntz, Curtis

Telephonic communications

Multi-line or key substation system with selective switching...

379 1, 379 32, H04M 124, H04M 322, H04M 100

Patent

active

057426716

ABSTRACT:
In a multi-line telephone system, an improved method is provided for automatically detecting and indicating the status of each of a plurality of telephone lines despite variations in battery voltages on the line or lines and without requiring any adjustments by the user. Each of the lines in a system can be polled sequentially or individually as desired. The improved method measures the present voltage level associated with the selected line, distinguishes the condition of on-or-off hook or on-hold from other possible states, compares and processes the present measured voltage level in a state matrix, and updates the status indication of the selected telephone line accordingly. Status conditions which are detected and indicated by this method include on-hook, off-hook, and on-hold.

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