Planet GS-5220 Series User Manual page 541

■ 1000BASE-T port link LED is lit, but the traffic is irregular.
Solution:
Check that the attached device is not set to dedicate full duplex. Some devices use a physical or software
switch to change duplex modes. Auto-negotiation may not recognize this type of full-duplex setting.
■ Switch does not power up.
Solution:
1. AC power cord is not inserted or faulty.
2. Check that the AC power cord is inserted correctly.
3. Replace the power cord if the cord is inserted correctly; check that the AC power source is
working by connecting a different device in place of the switch.
4. If that device works, refer to the next step.
5. If that device does not work, check the AC power.
User's Manual of GS-5220 LCD Series
541