Huawei S2700 Hardware Installation And Maintenance Manual page 159

S2700&S3700&S5700&S6700 Switch
Hardware Installation and Maintenance Guide
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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.
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Table 13-32
Table 13-32 Specifications for the DC power supply
Item
DC power
capacity to
support the surge
current
Regulated
voltage precision
Overshoot
amplitude of
switch on/off
Peak noise
voltage
Dynamic
response
Recommendations for DC Power Supply
The following are recommendations for the DC power supply.
Issue 13 (2017-11-20)
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.
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.
lists the specifications for the DC power supply.
Requirements
Greater than 1.5 times the rated current
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%.
Integral value of the DC output voltage ±5%
≤200 mV
The recovery time is less than 200 ms. The overshoot is in the range of
the integral value of the DC output voltage ±5%.
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