Huawei USG6000E Series - Page 607

– 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,
congure the inverter
or UPS that provides the maximum amount of power as the active one, and
congure another inverter or UPS as the standby.
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
oor, each providing power for the communications equipment room on this
oor. 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-5 lists the DC power supply
specications.
Table A-5 DC power supply specications
Item
Specications
Voltage uctuation range
allowed for the -48 V
input end
-48 V to -60 V
Surge current tolerance
capability in DC power
supply
At least 1.5 times higher than load rated current
capability
Regulated voltage
precision
The regulated voltage precision is less than or equal
to 1% when the AC input voltage uctuates
between 85% and 110% of the rated voltage, the
load current varies between 5% and 100% of the
rated current, and the output voltage of the rectier
is any xed value in the -46.0 V to -56.4 V range.
HUAWEI USG6000E Series
Hardware Guide A Appendix
Issue 08 (2022-04-20) Copyright © Huawei Technologies Co., Ltd. 600