3Com 4210G Series - Power Supply Failure; AC Input; RPS Input; RPS&AC Input

6-2
Power Supply Failure
The Switch 4210G use fixed power modules. Each of the Switch 4210G has three input modes, namely,
AC input, RPS input and both.
You can check whether the power system of the switch fails by viewing the system status LED (PWR)
and RPS status LED (RPS) on the front panel of the switch. For details, refer to
Table 6-1.
Table 6-1 Fixed power module failure LEDs description
LED Mark Status Description
System status
LED
PWR Off The switch is powered off.
Steady green
The AC input is normal, and the RPS is in the position
or works normally.
Steady yellow
RPS input is normal, but AC input fails or AC input is
not connected.
RPS status
LED (non-PoE
switches)
RPS
Off RPS is not connected.
Steady green The AC input and the RPS input work normally.
Steady yellow
The RPS input is normal, but the AC input fails or AC
input is not connected.
RPS status
LED (PoE
switches)
RPS
Off RPS input is abnormal.
AC input
If the system status LED is off, an AC input failure occurs. Then do the following:
z Check whether the AC power cord is well connected to the switch, whether the AC receptacle on
the switch and the AC power socket are faulty.
z Check whether the external AC power supply system is normal.
z Check whether the operating temperature of the switch is normal, and whether good ventilation is
provided to the power supply (the power module may stop working and enter the protection state
due to over-temperature).
RPS input
If the system status LED or RPS status LED is off, an RPS input failure occurs. Then do the following:
z Check whether the switch is well connected to the external RPS power supply.
z Check whether the external RPS power supply works normally.
z Check whether the operating temperature of the switch is normal, and whether good ventilation is
provided to the power supply (the power module may stop working and enter the protection state
due to over-temperature).
RPS&AC input
When the switch adopts both RPS and AC inputs , you can check the power supply status and the input
status of each line by viewing the system status LED and RPS status LED.
1) The system status LED is off.
Both the AC input and RPS input are faulty. Then do the following: