The power consumption of high-speed cables is often ignored, but in high-density cabinets, the stacking of the wire body and the temperature rise of the connectors at both ends will be superimposed on the air inlet. This article focuses on the three points of heat source, air duct obstruction and temperature boundary.

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Passive DAC copper cables have no active components, and the heat generation mainly comes from conductor losses. The power consumption of a single cable is usually only a few tenths of a watt, and the burden on the port side is lighter than that of the plug-in module. The AOC has integrated optical transmitting and receiving units at both ends, and there will be a perceptible temperature rise when working. For models above 40G40G AOC active optical cableThe head end is more obvious than copper cable.

Blockage of wind ducts is the main reason

  • Thick-diameter copper cables are coiled together at the air inlet at the bottom of the cabinet, which will directly block the cold air channel. The excess length should be coiled on the cable management rack and not piled on the front panel of the equipment.
  • Do not cross the short wire between the server and the switch in front of the fan module.
  • The AOC head end is arranged close to the port, leaving space for plugging and unplugging. Do not use adjacent ports to squeeze heat dissipation.
  • The opening ratio of the front and rear doors of the cabinet and the position of the blind panels blocked by wires should be checked together.

How to keep temperature margin

Cables in commercial computer rooms are generally designed for working environments between 0°C and 70°C. When the return air temperature of the cabinet is high, the joints will rise a few degrees higher. It is recommended to use100G DAC high speed cableFor this type of high-speed channel, the joint temperature is measured once during the full load period and recorded together with the cold aisle readings; when multiple devices are densely interconnected, copper cables are used to shorten the link, leaving AOC for cross-cabinet and long cabling to reduce the number of high-temperature points.

In thermal design, cables are variables, not constants. EB-LINK can be matched with the recommended length and specifications according to the power density of the cabinet. To evaluate the air duct problem of the existing cabinet, please contact 0755-83179002.