Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Reexamination Certificate
2006-06-06
2006-06-06
Tran, Sinh (Department: 2646)
Telephonic communications
Subscriber line or transmission line interface
Protective circuit
C361S119000
Reexamination Certificate
active
07058173
ABSTRACT:
A multi-stage surge protector/isolation barrier is provided for connection between a telephony device and a telephone network. The multi-stage surge protector/isolation barrier includes a first stage and a second stage. The first stage is operative to limit or clamp incoming voltage to a pre-defined level. In one form, the voltage limiting or clamping state includes a spark gap and over-voltage/over-current protector. The second stage is operative to limit or dissipate transients developed by the first stage. In one form, the transient limiting or dissipating stage includes transient filter circuitry. The transient filter circuitry may be implemented as LC filter circuitry. The subject multi-stage surge protector/isolation barrier helps prevent damage to the telephony device caused by voltage surges in the telephone network.
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Dupuis Timothy Joseph
Gokingco Jefferson Lim
Saksa Raymond Andrew
Briney III Walter F
Laks Joseph J.
Shedd Robert D.
Silicon Laboratories Inc.
Thomson Licensing
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