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NE40E-M2 V800R010C10SPC500 Installation Guide

This is NE40E-M2 V800R010C10SPC500 Installation Guide
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Requirements for Power Supply

Requirements for Power Supply

This section describes the requirements for the power supply.

Requirements for AC Power Supply

An AC power supply that consists of mains electricity, uninterruptible power supply (UPS), and self-supplied electric generator set can be used as an integrated power supply. The AC power supply must feature simple connection line, safe operation, flexible scheduling, and easy maintenance in addition to meeting the requirements of site load.

Low voltage power should adopt three-phase five-wire mode or monophase three-wire mode. Low voltage of AC power should be 110 V/127 V/220 V/380 V, and the frequency is 50 Hz.

UPS is required as the AC potential power, and it should be the same phase as the mains. The switching time of the UPS and mains should be less than 10 ms; otherwise, the device will reboot or reset.

The working current and fault current of the device should be taken into account when calculating the power distribution capacity in the equipment room. Ensure that independent AC power protects independent devices. Configure the current capacity of the protection switch of the equipment room to be higher than that of the device.

Table 2-5 provides the voltage ranges of AC power for the device.
Table 2-5 Voltage range of AC power



AC power capacity to support the device

-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

AC frequency

-15% to +10% of the rated voltage

Voltage waveform sine distortion rate

Within 5% of the rated current

The self-supplied electric generator set for a telecommunication office is an automated generator set that must provide standard interfaces, use telecommunication protocols, support remote communication, remote monitoring, and remote control, and feature automatic input, removal, and supply.

AC power cables should accord with the following specifications:
  • AC neutral uses the conductor with the same cross section as the phase line.
  • AC wires are non-flammable. The layout of AC wires complies with local regulations. Low-voltage power distribution rooms comply with local regulations.

Recommendations for AC Power Supply

The following lists several recommendations for AC power supply.
  • If the power voltage of the mains, which supplies power for the device directly, exceeds the rated voltage by -10% to 5%, or exceeds the voltage range that the device can support, a voltage regulating device or voltage stabilizing device is required.
  • If the mains does not supply power for the device directly, and the mains voltage exceeds the rated voltage by -15% to 10%, or exceeds the voltage range that the DC power supply device allows AC to input, a voltage regulating device or voltage stabilizing device is required.
  • A UPS power supply system or inverter power supply system is required to prevent interruption or surge of AC power supply.
  • When an abnormality occurs on the mains, the telecommunication office should be equipped with a self-supplied electric generator set as a power supply to prevent power supply interruption. The capacity should be 1.5 to 2 times the capacity that ensures uninterrupted AC power.
  • Storage batteries are usually installed in parallel connection of two groups. UPS storage batteries are generally installed in one group. UPS can adopt a serial or parallel connection to provide the required redundancy. 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 telecommunication site should receive stable and reliable DC power supply. Deploy the power equipment near the telecom equipment so that the DC feeder is as short as possible. To reduce power consumption and installation costs, the loop voltage drop from the battery port to the equipment port should be less than 3.2 V.

For a communication site with heavy traffic or with more than two switching systems, two or more independent power supply systems are required.

For a large-scale communication site, multiple power supply systems are configured on different floors to supply power to different equipment rooms. For a common communication site with medium traffic, a centralized power room or battery room is configured. You can also use a distributed power supply. Use the integrated power supply for an office with light traffic. Prevent the corrosive gas released by the battery from corroding the circuit board.

Table 2-6 lists the specifications for DC power.
Table 2-6 Specifications for DC power



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 is an integer in the range of -46.0 V to 56.4 V, with the regulated voltage precision equal to or lower than 1%.

Overshoot amplitude of switch on/off

Integral value of the DC output voltage ±5%

Peak-to-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 lists several recommendations for DC power supply.
  • Adopt a dispersed power supply. Use multiple DC power supply systems and set power equipment in multiple positions.
  • Adopt the standard DC power supply system, and set the output voltage of the communications equipment to be within the required range.
  • Improve the reliability of the AC power supply system, and reduce the capacity of storage batteries. For the small offices, add the capacity of storage batteries if it is difficult to enhance the reliability of the AC power supply system.
  • The total capacity of the high-frequency switch rectifier must satisfy the power of the communication loading and battery charging. Configure the backup rectifier modules. If there are 10 or fewer active modules, configure one backup module. If there are more than 10 active modules, configure one backup module for every 10 active modules.
  • Install the storage batteries in two or more groups. The capacity is determined by the duration that the storage batteries supply power to the load. For most offices, the batteries should be able to supply power for one hour at least.
Updated: 2019-01-02

Document ID: EDOC1100058424

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