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Power Supply Failure
The 3Com Baseline Switch 2928-HPWR Plus adopts AC power input, RPS power input, or both RPS
and AC power inputs. Other 3Com Baseline Switch 2900 Family adopt AC power input only.
You can determine whether the power system of a switch functions normally by viewing the power LED
or RPS power LED on the front panel.
With AC power input
When AC power input is used for power supply of a switch, you can check the power LED. The power
LED stays on when power system is normal. Otherwise, please check whether:
z The power cord is correctly connected, the power receptacle on the switch and the AC power
socket function normally.
z The power input to the switch is normal.
z The operating temperature of the switch is in the appropriate range and good ventilation is ensured
for the power supply unit. PoE switches support over-temperature protection, allowing the internal
power module to enter the protection state if the temperature is too high and then restore power
supply after the temperature becomes normal.
With RPS power input
When RPS power input is adopted, you can check the power LED or RPS power LED to judge the
status of the power system. Both LEDs stay on when the power system functions normally. Otherwise,
please check whether:
z The RPS DC power cord is correctly connected.
z The RPS power supply is normal.
z The operating temperature of the switch is in the appropriate range and good ventilation is ensured
for the power supply unit. PoE switches support over-temperature protection, allowing the internal
power module to enter the protection state if the temperature is too high and restore power supply
after the temperature becomes normal.
With both AC and RPS power supplies
When both the AC and RPS power supplies are adopted, you can check the power LED and the RPS
power LED to determine the status of each power input.
1) The power LED is off.
In this case, both the AC and RPS power inputs are abnormal. Please check that:
z The power cord is correctly connected, the power receptacle on the switch and the AC power
socket function normally.
z The AC power input to the switch is normal.
z The RPS DC power cord is correctly connected and the RPS power supply is normal.
z The operating temperature of the switch is in the appropriate range and a good ventilation is
ensured for the power supply unit. PoE switches support over-temperature protection, allowing the
internal power module to enter the protection state if the temperature is too high and then restore
power supply after the temperature becomes normal.
2) The power LED is on while the RPS LED is off.
The RPS power input is abnormal, please check that:
z The RPS DC power cord is correctly connected.