Troubleshooting guide: GS-3xxx switch deactivates PoE when external voltage is detected on a PoE port

Description:

If a GS-3xxx switch with active PoE detects external voltage on a PoE port, PoE is deactivated globally. This issue can occur if another switch with active PoE is connected to the GS-3xxx switch, which supplies voltage on the port to the GS-3xxx. To prevent this issue, PoE has to be deactivated on the additional switch for the port to the GS-3xxx switch.

This article describes how PoE can be deactivated on a specific port on a LANCOM switch, so that PoE remains active on the GS-3xxx switch. 

Requirements:

• LCOS SX as of version
  • 3.32 Rel for GS-23xx (download latest version)
  • 4.00 Rel for GS-3xxx (download latest version)
  • 5.20 Rel for GS-45xx (download latest version)
• Any web browser for accessing the webinterface

Procedure:

Procedure for a GS-23xx series switch:

1) Open the switch configuration via the webinterface and go to the menu Configuration → PoE → Configuration.

2) For the port to the GS-3xxx switch set the PoE Mode to Disabled and click Apply.

3) Go to the menu Maintenance → Save/Restore → Save Start and click Save to save the configuration as start configuration.

Procedure fo a GS-3xxx series switch:

1) Open the switch configuration via the webinterface and go to the menu PoE Management → PoE Configuration.

2) For the port to the GS-3xxx switch set the PoE Mode to Disabled and click Apply.

3. Click the disk icon in the top right-hand corner to save the configuration as the start configuration.

Procedure for a GS-45xx series switch:

1) Open the switch configuration via the webinterface and go to to the menu System → PoE → Summary.

2) Select the port to the GS-3xxx switch and click Edit.

3) For the PoE Port Mode select the option Disable in the dropdown menu and click Submit.

4) Click Save Configuration in the top right-hand corner to save the configuration as the start configuration.

5) Acknowledge the query by clicking OK.