There is a type of reason for communication interruption that has nothing to do with the link, but a momentary drop in power supply. This article explains the architecture selection method of UPS and dual-channel power supply from the perspective of reliability design: first determine the tolerance, then calculate the backup time, and finally put the dual-channel requirements on the equipment itself.

First determine how long the system can tolerate outages.

The levels are usually divided into three levels: completely incapable of interruption, the two power supplies need to be independent of each other on the mains side and equipped with an online UPS; able to tolerate millisecond-level switching, dual power supply equipment and automatic switching devices can be used; able to tolerate second-level interruptions, a single channel plus a backup power supply can also be satisfied. The switching time must be aligned with the device restart characteristics. Many transceivers and optical modules need to be powered on again for initialization after power failure. An interruption of tens of milliseconds is enough to cause link renegotiation and packet loss, which is often ignored.

The backup time is reversed according to the actual load.

Don't directly estimate battery life based on the battery's nominal capacity. A rough method is to multiply the voltage by the ampere-hour to get the energy, divide it by the actual load power, and then multiply it by the aging and discharge efficiency coefficient of 0.7 to 0.8. The number of hours obtained is conservative and usable. The load statistics should include all the equipment in the rack and the reserved margin. It is generally recommended to leave 30% room for growth. Stations powered by DC panels are calculated separately based on DC capacity, and it is easy to make mistakes when mixed with AC UPS.

Four requirements for dual circuits to be placed on the equipment side

  • The device itself supports dual power input or external switching. Single power supply equipment only provides dual power distribution circuits and is not considered true redundancy;
  • The two circuits come from different busbars or different transformers, and the ends are no longer connected in parallel back to the same power distribution cabinet;
  • The power distribution units are clearly grouped, and you can determine at a glance which ports are connected to the same channel during maintenance;
  • In a rack with centralized power supply, the heating of the power module and the slot arrangement should be considered together. Please refer to14-slot box transceiver rackpower supply and heat dissipation constraints.

Dual-channel transformation in computer room scenarios is generally done together with link redundancy, which can be combinedData center high-speed interconnection solutionhierarchical structure considerations. EB-LINK can provide a list of power consumption and power supply formats by model to facilitate capacity calculation. Tel: 0755-83179002.