ZyXEL ES3500-24HP User Guide - Page 336
A device that you expect to be powered via Ethernet doesn't receive power over Ethernet.
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Chapter 46 Troubleshooting One of the LEDs does not behave as expected. 1 Make sure you understand the normal behavior of the LED. See Section 3.2 on page 33. 2 Check the hardware connections. See Section 3.1 on page 28. 3 Inspect your cables for damage. Contact the vendor to replace any damaged cables. 4 Turn the Switch off and on. 5 Disconnect and re-connect the power cord to the Switch. 6 If the problem continues, contact the vendor. A device that you expect to be powered via Ethernet doesn't receive power over Ethernet. 1 Make sure the PoE LED for the port supplying power over Ethernet is on. 2 Make sure the Switch port has PD selected so it can supply power over Ethernet. See Chapter 8 on page 96. 3 Inspect your Ethernet cables for damage. Replace any damaged cables. 4 Check cable lengths. 5 Disconnect the device that you expect to be powered via Ethernet and make sure the Switch has enough remaining power to supply the device before re-connecting it. See Chapter 8 on page 94. 6 Increase the priority of the port. See Chapter 8 on page 94. A port is cabled correctly, but the port status is down. 1 Disable Green Ethernet on the port. See Chapter 34 on page 266 for details of how to do this. If the port comes up, then the port at the other end of the link probably doesn't support Green Ethernet. If the port comes up, then try disabling and re-enabling the port again. 2 Inspect your Ethernet cables for damage. Replace any damaged cables. 3 Check cable lengths. 4 Check that the device at the other end of the link is powered on. 336 ES3500 Series User's Guide