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US 2003/0198027 A1Published application
Submarine branching unit
AssigneeFujitsu Limited
InventorsTaiichi Takeda, Junko Nishida
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AssigneeFujitsu Limited
InventorsTaiichi Takeda, Junko Nishida
Estimating the term…
In a submarine branching unit which comprises in a pressure-tight cylinder, a circuit board, at least one circuit unit and plural vacuum relays each having terminals and wirings, the circuit unit is mounted on one side of the circuit board; the vacuum relays are mounted on the other side of the circuit board; and insulator covers accommodate the respective vacuum relays, terminals and wirings to insulate the vacuum relays from each other. The submarine branching unit further comprises a pair of cables extending out of a cover of the pressure-tight cylinder, which cables are each spiraled and engaged with each other in an interleaved and overlapped fashion.
A submarine branching unit comprising:
A submarine branching unit comprising:
A submarine branching unit comprising:
A method of manufacturing a submarine branching unit including a pressure-tight cylinder, a circuit board, at least one circuit unit, a plurality of vacuum relays each having respective terminals and wirings and a plurality of insulator covers, said method comprising the steps of:
A method of manufacturing a submarine branching unit including a pressure-tight cylinder and a pair of cables extending out of an end of the pressure-tight cylinder, said method comprising the steps of:
Dependencies are inferred from the claim text.
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For incorporating transformers, loading coils or amplifiers: specially adapted for submarine cables
Installation of electric cables or lines, or of combined optical and electric
Term end not estimated
1. Field of the Invention
The present invention relates to a submarine branching unit (herein after simply called branching unit) which branches a transmission line in two different directions in a communication system using the submarine cables, or more particularly to an improvement of the structure of the branching unit.
In order to further accelerate the development of information communication including the Internet via such submarine cables, it is in demand to shorten the time required to deliver communication equipment to customers after a contract has been made. In fact, submarine equipment such as a repeater has recently come to be manufactured within about half the period required several years ago To install or lay a repeater and a submarine cable underseas, a dedicated ship is used and therefore, development of the submarine equipment which is easy to install and lay in the sea is in demand.
FIG. 1 shows an external appearance of a conventional branching unit.
FIG. 2 is a sectional side view of the main body of the branching unit.
FIG. 3 is a side view of the inner unit.
Preferred embodiment of the present invention is explained, referring to the drawings. Throughout the above-mentioned drawings, identical reference numerals are used to designate the same or similar component parts. Moreover, the expressions “upper”, “lower”, “right” and “left” are not directed to the real unit, but to the figure for easy understanding.
FIG. 6 shows an external appearance of the branching unit of the present invention. FIG. 7 is a sectional side view of the main body shown in FIG. 6. The branching unit 11 is composed of an inner unit 13, cable containers 14, submarine cables 15, cable terminations 16 and gimbal joints 17. The inner unit 13 is contained in a pressure-tight cylinder 12. The cable containers 14 located at both ends of the pressure-tight cylinder 12, contain a pigtail cable consisting of an optical fiber for signal transmission and a feeder line for power supply. The cable terminations 16 connect the submarine cables 15 to the cables within the branching unit. The gimbal joint 17 bendably couples the cable containers 14 to the cable terminations 16.
As shown in FIG. 8—side view and FIG. 9—top view, the inner unit 13 has six vacuum relays 19 and five junction terminals 21 mounted on top of the circuit board; however, they are entirely covered with and obscured by insulator covers.