Table of Contents
Advertisement
Chapter 9: Troubleshooting
110
Problem 4: The PoE budget displayed by the SHOW POWER-INLINE
command is 240W below the correct value for the number of PWR300
power supplies connected to the switch. For example, the command
displays a budget of only 480W, instead of 720W, for a switch with three
power supplies, or 240W, instead of 480W, for a switch with two power
supplies.
Solutions: One PWR300 power supply is not working.
Examine the DC OUT/FAULT LEDs on the front panels of the PWR300
power supplies. If an LED is off on a power supply, go to Problem 2. If an
LED is amber on a power supply, go to Problem 3.
If the LEDs are green on all the power supplies, try using the SHOW
SYSTEM ENVIRONMENT command to identify the power supply that is
not providing power to the switch. Then try the following on the identified
power supply:
Verify that the DC wire harness is securely connected to the
connector on the switch and power supply.
Verify that the AC power cable is securely connected to the
connector on the power supply and the AC power source.
Try replacing the DC wire harness.
Try replacing the power supply.
Problem 5: The PoE budget displayed by the SHOW POWER-INLINE
command is below the correct value for the number of PWR300 power
supplies connected to the switch. For example, the switch has three power
supplies, but the command displays a budget of only 680W, instead of
720W.
Solutions: The DC output from one or more of the PWR300 power
supplies is below operating norms.
This is usually caused by a failing or overheating power supply. (DC
outputs decrease as power supplies overheat.) Try the following:
Verify that there is adequate airflow around the power supplies.
Verify that there is adequate distance for ventilation between the
power supplies and between the power supplies and other network
devices.
Examine the DC OUT/FAULT LEDs on the front panels of the PWR300
power supplies. If the LED is amber on a power supply, signaling a fault
condition, replace that unit.
Advertisement
Table of Contents
