device connected to the nth main submarine cable to the adjacent submarine feed branching device through submarine repeaters thereby receiving power from a constant current feed unit each constant current feed unit is built in the submarine feed branching device the submarine feed branching devices and the submarine repeaters are arranged in a matrix on a plane application_number US 36541203 A description an embodiment of the present invention will now be described in detail hereinbelow with reference to the drawings fig1 is a block diagram of the configuration of a submarine feed branching device according to the present invention referring to fig1 constant voltage feed units 1 and 1 a are disposed on the land the constant voltage feed units 1 and 1 a supply constant voltage power to submarine feed branching devices 10 through constant voltage feed lines 2 and 2 a respectively the respective submarine feed branching devices 10 convert the constant voltage power into negative u2212 constant current power and positive constant current power and then feed the constant current power to submarine repeaters 20 through constant current feed lines 3 3 a and 3 b each submarine feed branching device 10 feeds power to the next stage submarine feed branching device 10 or 10 a through the constant voltage feed line 2 or 2 a.