Huawei USG6000 Series Hardware Manual page 413

HUAWEI USG6000 Series
Hardware Guide
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In addition, the basic AC power supply system should meet the following requirements:
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Basic DC Power Supply
Ensure the reliability of the DC power supply system at the communications site. Deploy the
power supply device as close as possible to the communications devices so as to shorten the
power feeder and lower the circuit voltage drop between the battery port and device port to
less than 3.2 V, thereby reducing installation costs and power consumption.
Use two or more independent power supply systems if the communication volume is large or
if more than two switching systems are deployed at the site.
For large communications hubs, deploy an independent power supply system on each floor,
each providing power for the communications equipment room on this floor. Medium-sized
communications stations can be centrally powered by a power room or storage battery room,
or powered in a decentralized manner. For small-sized communications stations, the power
supply system can be deployed in the same equipment room as the communications devices,
but you must take appropriate measures to ensure that the corrosive gases discharged by the
batteries in the equipment room do not corrode the circuit boards of communications devices.
Table A-20
Table A-20 DC power supply specifications
Item
Voltage fluctuation range
allowed for the -48 V input
end
Issue 08 (2017-06-30)
The DC and AC conducting wires must be fire resistant and the wiring must comply with
the Class A Fire Resistance Design Norm for High-Rise Civil Buildings (GB50045-95).
The low-voltage power distribution facilities must comply with the Low-Voltage Power
Distribution Facilities and Wiring Design Norm (GB50054-95)
Use voltage regulating or stabilization facilities to restrict the voltage fluctuation within a
reasonable scale if:
– The communications devices are powered by mains, and the voltage exceeds the
rated voltage by +5% to -10% or the allowed voltage range.
– The communications devices are not powered directly by the mains and the voltage
of the mains exceeds the rated voltage by +10% to -15% or the AC voltage range
allowed by the DC power supply device.
Use the UPS or inverter power supply system if the communication load requires non-
interruptible and non-transient AC power supply.
Equip the site with the electric generator set to ensure normal communication in case of
mains failure. The capacity of the generator set is greater than or equal to 1.5 to 2 times
the capacity of the UPS.
A UPS usually has only one batter set. Connect two or more UPSs in parallel or series
for redundancy. If the inverter or UPS is used, configure the inverter or UPS that
provides the maximum amount of power as the active one, and configure another
inverter or UPS as the standby.
lists the DC power supply specifications.
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Specifications
-48 V to -60 V
A Appendix
399