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Managed Layer 2 Switches GSM7224R and GSM7248R Hardware Installation Guide
3-2 Troubleshooting
v1.0, November 2007
Additional Troubleshooting Suggestions
If the suggestions in Table 3-1 do not resolve your problem, refer to the troubleshooting
suggestions in this section.
• Network adapter cards
Make sure that the network adapter cards installed in the PCs are in working condition and that
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.
• Auto-negotiation
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 auto-negotiation. If the device does not support auto
negotiation, the switch determines the speed, and the duplex mode defaults to half duplex. The
fiber gigabit ports negotiate speed, duplex mode, and flow control, provided that the attached
device supports auto-negotiation.
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 is flashing
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.
Table 3-1. Troubleshooting Chart (continued)
Problem Cause Solution