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

Additional Troubleshooting Suggestions 

troubleshooting suggestions in this section. 

Make sure that the network adapter cards installed in the PCs are in working condition 
and the software driver has been installed.

 

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If problems occur after you change the network configuration, restore the original 
connections. Then find the problem by making the connections, one step at a time. Make 
sure that cable distances, repeater limits, and other physical aspects of the installation do 
not exceed the Ethernet limitations. 

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You can verify the integrity of the switch by resetting the switch. To reset the switch, use 
the Tools> Reset command or remove AC power from the switch and then reapply AC 
power. If the problem continues, contact NETGEAR technical support. 

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If the device at the other end of the link supports auto-negotiation, the copper 
10/100/1000 Mbps ports negotiate the correct duplex mode and speed. If the device does 
not support auto-negotiation, the switch determines only the speed correctly, and the 
duplex mode defaults to half-duplex. If the attached device supports auto-negotiation, the 
fiber gigabit ports negotiate speed, duplex mode, and flow control.