Network communication device

A network communication device

• wherein a relay circuit board coupled to a power supply unit is placed in a vertical direction in the middle of a chassis;
• a plurality of first circuit board units, each of which includes a first semiconductor device, are arranged in a horizontal direction in the chassis on a side of a front side of the chassis than to the relay circuit board;
• one or more cooling units equipped with a fan and a plurality of second circuit board units, each of which includes a second semiconductor device, are arranged side by side in the chassis on a side of a back side of the chassis than to the relay circuit board;
• and each first circuit board unit, each second circuit board unit, and each cooling unit are coupled to each other via the relay circuit board and electric power from the power supply unit is supplied via the relay circuit board to each first circuit board unit, each second circuit board unit, and each cooling unit;
• wherein a plurality of first upper-side intake holes for introducing intake air to an upper side of the chassis are formed in the upper part of a front face of the chassis, a plurality of first lower-side intake holes for introducing the intake air to a lower part of the front face of the chassis are formed in the lower part of the front face of the chassis, and a first exhaust hole for discharging cooling air discharged from the cooling unit to outside of the chassis is formed in a back face of the chassis;
• wherein a second intake hole is formed in a front side of each first circuit board unit;
• wherein a plurality of upper-side vent holes for discharging the intake air, which has been introduced through each first upper-side intake hole, to a back side of the chassis, a plurality of lower-side vent holes for discharging the intake air, which has been introduced through each first lower-side intake hole, to the back side of the chassis, and a plurality of openings for introducing the intake air, which has been introduced from each second intake hole to around each first circuit board unit, to the cooling unit are formed in the relay circuit board;
• wherein a plurality of first circuit board unit air passages including each second intake hole, a first space part around each first circuit board unit, each opening in the relay circuit board, and a second space part between a back side of the relay circuit board and the cooling unit are formed in the chassis;
• a plurality of second circuit board unit air passages including each first upper-side intake hole in the relay circuit board, each upper-side vent hole in the relay circuit board, a third space unit between each first upper-side intake hole and each upper-side vent hole, and a fourth space part between the back side of the relay circuit board and the cooling unit are formed;
• and a plurality of lower-side second circuit board unit air passages including each first lower-side intake hole, each lower-side vent hole in the relay circuit board, a fifth space part between each first lower-side intake hole and each lower-side vent hole, and a sixth space part between a back side of the relay circuit board and the cooling unit are formed;
• wherein any of the second circuit board units is placed in each upper-side second circuit board unit air passage or each lower-side second circuit board unit air passage.

A network communication device comprising:

• a first circuit board unit where an external interface connector is connectable to and disconnectable from a cable and inserted into a slot is placed on a front face of a chassis;
• a relay circuit board coupled to the first circuit board unit inserted into the slot;
• a plurality of second circuit board units arranged side by side in a vertical direction in the chassis on a side of a back side of the chassis to the relay circuit board and coupled to the relay circuit board;
• one or more cooling units placed between the plurality of second circuit board units and equipped with a fan for externally discharging air from the chassis;
• and
• a third circuit board unit for controlling the first circuit board unit, the second circuit board units, the cooling unit, and a power supply unit via the relay circuit board,
• wherein the first circuit board unit and the third circuit board unit are placed above the power supply unit;
• wherein a first vent hole is formed in the cooling unit on a side of the relay circuit board and a second vent hole is formed in the cooling unit on a side of the second circuit board unit;
• wherein a first front-face vent hole is formed on the front face of the chassis of the first circuit board unit and a second front-face vent hole is formed on the front face of the chassis between the first circuit board unit and the power supply unit.