Electrical system like a system for testing the channels of...

Details Electrical system like a system for testing the channels of... Electrical system like a system for testing the channels of...

2006-12-12

2006-12-12

Tran, Quoc (Department: 2614)

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

C379S412000, C379S399010, C379S001010

Reexamination Certificate

active

07149286

ABSTRACT:
An electrical system is described comprising none or one or two function boards and at least one voltage converter. The function board/s and the voltage converter are connected such that a voltage generated by the voltage converter is supplied to the function board/s. The electrical system comprises an electrical circuit for checking whether two function boards are present and whether these two function boards are identical, and for disabling the voltage converter under the condition that two non-identical function boards are present.

REFERENCES:
patent: 3890559 (1975-06-01), Kuster
patent: 4541094 (1985-09-01), Stiffler et al.
patent: 4947427 (1990-08-01), Rosch et al.
patent: 5909591 (1999-06-01), Brooke
patent: 6247144 (2001-06-01), Macias-Garza et al.
patent: 2002/0118023 (2002-08-01), Ewalt et al.
patent: 0212045 (1987-03-01), None
Patent Abstracts of Japan document No. JP 11155233.

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