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Hardware Installation and Maintenance Guide

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600

This section provides brief procedure for installing the AR series routers. This document describes preparations before AR series routers installation, installation methods and precautions, AR series routers maintenance, and common methods for troubleshooting typical hardware module faults.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Requirements for Power Supply

Requirements for Power Supply

Requirements for AC Power Supply

An AC power supply system consists of power mains, uninterruptible power supplies (UPSs), and self-supplied electric generators. In addition to meeting the requirements of the server load, the AC power supply must have a simple connection line, safe operation, flexible scheduling, and easy maintenance.

The low-voltage power supply should be 3-phase, 5-wire mode or monophase 3-wire mode. This AC power supply should be 110 V/220 V, with a frequency of 50 Hz.

The UPS should supply the same power and operate at the same phase as the power mains. The switching time between the UPS and mains should be less than 10 ms; otherwise, the networking devices will reboot or reset.

For power distribution capacity in the equipment room, both the working current and fault current of the devices should be considered. Ensure that independent AC power supplies protect independent devices. Configure the current-carrying capacity of the protection switch of the equipment room for more than that of the devices.

Table 7-19 lists the voltage range of the AC power supply for the devices.
Table 7-19  Voltage range of AC power supply



AC power capacity to support the devices

-10% to +5% of the rated voltage

AC power capacity to support the power modules and important buildings

-15% to +10% of the rated voltage

Frequency of alternating current

-4% to +4% of the rated value

Voltage wave shape sine distortion

Within 5% of the rated voltage

The automated electric generator must have a standard interface that supports telecommunication protocols, remote telecommunication, monitoring, and control.

AC power cables should meet the following specifications:
  • AC neutral should have a conductor with the same cross section as the phase line.
  • AC cables should have non-flammable insulation. The layout of AC cables should comply with local regulations. Low-voltage power distribution rooms should comply with local regulations.

Recommendations for AC Power Supply

The following are recommendations for the AC power supply.
  • If the voltage of the power mains that supply power directly to devices exceeds the rated voltage by -10% to 5%, or exceeds the voltage range that devices can support, a voltage regulating device or voltage stabilizing device is required.
  • If the mains do not supply power for the device directly, or if the mains voltage exceeds the rated voltage by -15% to 10% or exceeds the input voltage range of the DC power supply, a voltage regulating device or voltage stabilizing device is required.
  • A UPS or inverter power supply system is required to provide uninterrupted AC power to support the telecommunication load.
  • If abnormalities occur on the mains, telecommunication servers should be equipped with a self-supplied electric generator to support the key telecommunication load. The capacity should be not less than 150% to 200% of the total uninterruptible power supply.
  • Storage batteries are usually installed in a parallel connection of two groups. UPS storage batteries are generally installed in one group. The redundancy required for the UPS can rely on concatenation or parallel connection. When an inverter or a UPS is used, the active inverter is determined by the maximum power and a backup inverter is required.

Requirements for DC Power Supply

The equipment room should receive stable and reliable DC power. Deploy the power equipment near the telecommunications equipment to make the DC feeder as short as possible. To reduce power consumption and installation cost, the loop voltage drop from the battery port to the equipment port should be less than 3.2 V.

  • A large-scale enterprise can deploy an independent power supply system on each floor to supply power to the telecommunications equipment room on the respective floor.
  • A medium-scale enterprise can use a power room and a battery room for centralized power supply or use distributed power supply systems.
  • A small-scale enterprise can deploy an integrated power supply system in its equipment room but must take measures to prevent corrosive gases released from batteries from eroding circuit boards of telecommunications equipment.
Table 7-20 lists the specifications for the DC power supply.
Table 7-20  Specifications for the DC power supply



Range of the -48 V input voltage

-38 V to -72 V

DC power capacity to support the surge current

Greater than 1.5 times the rated current

Regulated voltage precision

If the AC input voltage is in the range of 85% to 110% of the rated value, and the load current is in the range of 5% to 100% of the rated value, the output voltage of the rectifier ranges from -46.0 V to -56.4 V, with the regulated voltage precision less than or equal to 1%.

Overshoot amplitude of switch on/off

Integral value of the DC output voltage ±5%

Peak noise voltage

≤200 mV

Dynamic response

The recovery time is less than 200 ms. The overshoot is in the range of the integral value of the DC output voltage ±5%.

Recommendations for DC Power Supply

The following are recommendations for the DC power supply.
  • Use distributed power supply mode. Use multiple DC power supply systems and put power equipment in multiple locations.
  • Adopt a standard DC power supply system, and set the output voltage to the communications equipment within the required range.
  • Improve reliability of the AC power supply system to reduce the necessary capacity of storage batteries. For small offices, increase the capacity of storage batteries if it is difficult to enhance reliability of the AC power supply system.
  • The total capacity of the high-frequency switching rectifier must satisfy the power of the communication loading and battery charging. If there are 10 or fewer active rectifier modules, configure one backup module. If there are more than 10 active modules, configure one backup module for every 10 active modules.
  • Install storage batteries in two or more groups. The capacity is determined by the duration for which the storage batteries must supply power. For most offices, the batteries should be able to supply power for at least one hour.
Updated: 2019-05-17

Document ID: EDOC1000039117

Views: 78252

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