Maintenance unit for modular public telephone

Details Maintenance unit for modular public telephone Maintenance unit for modular public telephone

1992-01-15

1994-05-03

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Using portable test set

379 27, 379155, H04M 124, H04M 1700

Patent

active

053094980

ABSTRACT:
Maintenance unit for modular public telephone, the unit being made up based on a microprocessor, a block for communication with the modular telephone, a rotating switch to take measurements and a condenser charger for the modular public telephone, with a rapid condenser charger to feed the modular telephone that will load the logic and the activators, allowing the unit to communicate through any telephone situated on a line protected by a validation and identification unit, and carrying out the same through the selection of the identification number on turning switches. The unit also has circuit blocks to measure feed condenser voltage, line current, alternative voltage with respect to grounding and the state of the battery.

REFERENCES:
patent: 4691336 (1987-09-01), Durston
patent: 4926458 (1990-05-01), Reger et al.
patent: 4996703 (1991-02-01), Gray

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