Hardware Installation and Usage Precautions

Following All Safety Precautions

  • To ensure human and device security, comply with all the safety precautions marked on the device and instructed in this document before any operation. The CAUTION, WARNING, and NOTE items in this document do not cover all the safety precautions that must be obeyed. They are supplements to the safety precautions.
  • When operating Huawei products and equipment, comply with safety precautions and special safety instructions relevant to the corresponding equipment provided by Huawei. The safety precautions in this document are only some that Huawei can predict. Huawei is not liable for any consequence that results from violation of universal regulations for safety operations and safety codes on design, production, and equipment use.

Complying with Local Rules and Regulations

When operating a device, comply with local laws and regulations.

Installation Personnel Requirement

Installation and maintenance personnel must be trained to perform operations correctly and safely.

Personnel Safety

  • A high-voltage power supply provides power for device operations. Direct human contact with the high voltage power supply or human contact through damp objects can be fatal.
  • Unspecified or unauthorized high voltage operations could result in fire or electric shock, or both.
  • Ground a device before powering it on; otherwise, the human body and the device are exposed to danger.
  • Before performing operations on the power supply facilities, power off these facilities.
  • Do not look into the optical port without eye protection when handling optical fibers.
  • To protect human respiratory organs and human eyes from dust, take protective measures when drilling holes.
  • When working at heights, prevent objects from falling down.

Device Security

  • Keep an unpacked device upright and handle it with care when carrying it or installing it into a cabinet.
  • Use a ladder to lay out cables. Do not trample on a device.
  • Wear an ESD wrist strap or ESD gloves when handling circuit boards. Otherwise, the static electricity discharged from the human body may damage the electrostatic sensitive components, such as large-scale integrated circuits (LSIs) on the circuit board.
  • Before operating the device, check the electrical connection of the device, and ensure that the device is properly grounded.

Condensation Prevention

  • Before installing the equipment, ensure that no condensation is on the equipment. Otherwise, the equipment may fail to be powered on.
  • If the indoor and outdoor temperature difference is 15°C or more, wait eight hours after moving devices to the equipment and then install them.
  • Generally, when the outdoor humidity is greater than 80% and the indoor and outdoor temperature difference is greater than 5°C, condensation forms. In highly humid weather, before installing a device or board, you are advised to remove the package inside an equipment room and check whether condensation forms as follows: Touch the surface of the device or board with dry fingers or ESD gloves to check whether water marks exist. If they do, condensation forms, and the device or board must be kept in the equipment room for 8 hours before being powered on.

    If the temperature difference is undetermined, wait one night before installing the equipment.If the temperature difference is undetermined, wait one night before installing the equipment.

In damp scenarios such as subways and tunnels, power on the equipment within 24 hours after unpacking to prevent condensation. During future maintenance, ensure that the power-off time does not exceed 24 hours.

Power Module

  • A power module will enter the protection state upon input overvoltage, undervoltage, overtemperature, or output overcurrent. Note that when a power module enters the overtemperature protection state, take measures to lower the ambient temperature. The power module can automatically resume power supply when the temperature falls within the normal range. After a power module enters the protection state, the module will report a corresponding protection state alarm to the MPU and cannot properly supply power to the device. Note that a faulty fan module will also report fault information to the MPU. If the power module cannot automatically resume power supply after the triggering condition of the protection state is removed, remove the power module from the chassis and reinstall it at least 30s later. The power module then can work properly.


  • To protect personal safety, do not install power cables when the power is on. Before connecting power cables, make sure that the power switches of the external power supply system and the device are all in OFF position.
  • Before connecting signal cables, take ESD protection measures, for example, wear ESD gloves or an ESD wrist strap.
  • Before connecting Ethernet cables, use an Ethernet cable tester to test cable connectivity.
  • Both ends of an idle high-speed cable must be covered by an ESD cap.
  • The bend radius of high-speed cables must be larger than the minimum bend radius. Overbending high-speed cables may damage wires in the cables.
  • Laser beams will cause eye damage. Do not look into bores of optical modules or optical fibers without eye protection.
  • Cover idle optical ports and optical modules with dust plugs and cover idle optical fibers with dust caps.
  • Bundle optical fibers with binding tape. Apply appropriate force to ensure that the optical fibers in a bundle can be moved easily.
  • Fiber connectors must be tidy and clean to ensure normal communication. If a fiber connector is contaminated, clean it using a piece of fiber cleaning fabric.

Optical Module

  • Devices must use optical modules that are certified for Huawei devices. Optical modules that are not certified for Huawei devices cannot ensure transmission reliability and may affect service stability. Huawei is not liable for any problems caused by the use of optical modules that are not certified for Huawei devices.
  • The transmit power of a long-distance optical module is often larger than its overload power. Therefore, when using such optical modules, select optical fibers of an appropriate length to ensure that the actual receive power is smaller than the overload power. If the optical fibers connected to a long-distance optical module are too short, use an optical attenuator to reduce the receive power on the remote optical module. Otherwise, the remote optical module may be burnt.
Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
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