Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1998-12-07
2000-09-05
Jackson, Stephen W.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
361 931, 361115, 361106, H02H 300
Patent
active
061152269
ABSTRACT:
A communication system (10) includes a central office (16) that provides communication services to a plurality of subscribers (18) using differential transmission line pairs (21). The differential transmission line pairs are vulnerable to lightning strikes that may damage equipment coupled to the differential transmission line pairs. A protection circuit (51A) protects equipment from damage from a lightning strike and allows for continued operation after the lightning strike. The protection circuit involves automatically resettable fuses (66, 81) in parallel with non-resettable fuses (67, 82). Continued operation is effected at a normal level after a weak lightning strike, and at a reduced level after a strong strike.
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Cisco Technology Inc.
Jackson Stephen W.
LandOfFree
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