Branching unit for underwater telecommunications systems

Details Branching unit for underwater telecommunications systems Branching unit for underwater telecommunications systems

1995-03-03

1998-11-24

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307125, 307126, 307113, 340850, 34087039, H04B 1302

Patent

active

058412050

ABSTRACT:
A branching unit for an underwater communications system is arranged so as to provide remote hot switching for electrical power. The unit has three terminations (1, 2, 3) each for a different one of three line cables and one or more power demand circuits (20) requiring an electrical power feed from the line cables. A first switch is actuable to complete a current path between an appropriate pair of the three terminations via one or more of the power demand circuits depending upon relative line voltage. A second switch is actuable after actuation of the first switch depending upon current supplied to the power demand circuit(s) rising above that which occurs upon action of the first switch. The second switch completes a circuit between the non-paired termination and a fourth termination for a sea-earth.

REFERENCES:
patent: 4096466 (1978-06-01), Johnson
patent: 4641372 (1987-02-01), Kelly et al.
patent: 5196984 (1993-03-01), Webb
patent: 5489897 (1996-02-01), Inoue
patent: 5491368 (1996-02-01), Yamamoto

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