Netgear M4100-26G-POE (GSM7226LPv1h1) - 22‐port GE + 4 GE Combo L2 Managed PoE Switch Hardware Manual

suggestions in this section. 

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

 

Configuration:  
If problems occur after you change the network configuration, restore the original 
connections. Then find the problem by making the changes, 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. 

Switch integrity:  
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. 

Autonegotiation:  
The copper 10/100/1000 Mbps ports negotiate the correct duplex mode and speed if the 

device at the other end of the link supports autonegotiation. If the device does not support 
autonegotiation, the switch determines only the speed correctly and the duplex mode 
defaults to half-duplex. The fiber gigabit ports negotiate speed, duplex mode, and flow 
control if the attached device supports autonegotiation.