ZyXEL Communications ES3500-24 User Manual page 336

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