Protection circuit for a digital subscriber line device

Details Protection circuit for a digital subscriber line device Protection circuit for a digital subscriber line device

2006-09-12

2006-09-12

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

C361S117000

Reexamination Certificate

active

07106573

ABSTRACT:
A protection circuit for a DSL transceiver unit includes a capacitor connected in series between a first and second portion of a primary winding of a transformer. The first and second portions are coupled to first and second lines, respectively, of a twisted-pair telephone line. A first voltage controlled device is coupled to the first line and a chassis ground. The first voltage controlled device has a first threshold turn-on voltage at which the first voltage controlled device provides a first current path from the first line to chassis ground. A resistive device and a second voltage controlled device are coupled across the capacitor in series. The second voltage controlled device has a second threshold turn-on voltage at which the second voltage controlled device provides a second current path from a first capacitor terminal of the capacitor to a second capacitor terminal of the capacitor. The second threshold turn-on voltage is lower than the first threshold turn-on voltage.

REFERENCES:
patent: 5142429 (1992-08-01), Jaki
patent: 6377435 (2002-04-01), Nabell et al.
patent: 6628498 (2003-09-01), Whitney et al.

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