NEC QX-S5500G Series Installation Manual page 117

Installation Guide
QX-S5500G Series Ethernet Switches
c) Verify that the operating temperature of the switch is in an acceptable range, and the
power module has good ventilation. Over-temperature can cause the power module to
stop working and enter protection state.
d) If the problem persists, contact NEC Support.
II. RPS DC input
Symptom

The system status LED or RPS status LED is off.
Solution

To resolve the problem:
a) Verify that the switch is securely connected to the RPS.
b) Verify that the RPS is operating correctly.
c) Verify that the operating temperature of the switch is in an acceptable range, and the
power module has good ventilation. Over-temperature can cause the power module to
stop working and enter protection state.
d) If the problem persists, contact NEC Support.
III. Concurrent RPS and AC inputs
1) Symptom 1
The system status LED is off.
Solution

To resolve the problem:
a) Verify that the AC power cord is securely connected to the switch, and the AC-input
power receptacle on the switch and the connected AC power outlet are in good
condition.
b) Verify that the external AC power system is operating correctly.
c) Verify that the switch is securely connected to the RPS.
d) Verify that the RPS is operating correctly.
7. Maintenance and troubleshooting
7-2