Patent ID: 7463034
Filing Date: 2008-12-09
Classification: G01R

Abstract:
1. A system for selectively grounding each of a plurality of buried short-haul utility conveyances coupled to a common buried long-haul utility conveyance to enable a conveyance locating signal transmitted through the buried long-haul conveyance to travel from the buried long-haul utility conveyance to a selected buried short-haul utility conveyance, comprising: a first optical switch for selecting a buried short-haul utility conveyance to be grounded among the plurality of buried short-haul utility conveyances, the first optical switch adapted to output an optical control signal; and a second optical switch coupled to each buried short-haul utility conveyance for grounding each buried short-haul utility conveyance, the second optical switch being responsive to the optical control signal from the first optical switch.