Netgear M5300-28G-POE+ (GSM7228PSv1h2) - 12-Port Managed Gigabit Switch Hardwarehandbuch

3.   

Troubleshooting

Troubleshooting Chart 

The following table lists symptoms, causes, and solutions of possible problems.

Power LED is off. 

No power is received.

Check the power cord connections for the switch 
at the switch and the connected device. 
Make sure that all cables used are correct and 
comply with Ethernet specifications. 

Link LED is off or intermittent.  Port connection is not 

working. 

• Check the crimp on the connectors. Make sure 

that the plug is fully inserted and locked into 
the port at both the switch and the connecting 
device. 

• Make sure that all cables used are correct and 

comply with Ethernet specifications. See 

, 

• Check for a defective adapter card, cable, or 

port by testing it in an alternate environment 
where all products are functioning.

Slow file transfer or there is 
performance degradation. 

Half- or full-duplex setting on 
the switch and the connected 
device are not the same. 

• Make sure that the attached device is set to 

auto negotiate. 

• Check the system message log. 

A segment or device is not 

recognized as part of the 
network. 

One or more devices are not 
properly connected, or cabling 
does not meet Ethernet 
guidelines. 

Verify that the cabling is correct. Be sure that all 
connectors are securely positioned in the 
required ports. Equipment might have been 
accidentally disconnected. 

ACT LED flashes 

continuously on all connected 
ports, and the network is 
disabled. 

A network loop (redundant 

path) has been created. 

Break the loop by ensuring that there is only one 
path from any networked device to any other 
networked device.