B.2.2 Recommendations for AC Power Supply
The following shows recommendations for the AC power supply.
l
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.
l
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.
l
An UPS or inverter power supply system is required to provide uninterrupted AC power
to support the telecommunication load.
l
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 uninterruptable power supply.
l
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.
B.2.3 Requirements for DC Power Supply
The telecommunication site should receive stable and reliable DC power. Deploy the power
equipment near the telecom 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.
For a communication site with heavy traffic or with more than two switching systems, two or
more independent power supply systems should be used.
For a large-scale communication site, multiple power supply systems are configured on different
floors to supply power to equipment rooms. For a common communication site with medium
traffic, a centralized power room or battery room is configured. You can also adopt a distributed
power supply mode. Use an integrated power supply for an office with little traffic. Be sure to
prevent the corrosive gas released by batteries from eroding circuit boards.
shows the specifications for the DC power supply.
Table B-7
Specifications for the DC power supply
Item
Requirements
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%.
HUAWEI NetEngine80E Router
Installation Guide
B Environmental Requirements for Device Operation
Issue 02 (2011-09-10)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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