Appendix B Troubleshooting, Troubleshooting Chart

APPENDIX B: TROUBLESHOOTING

This chapter provides information about troubleshooting the NETGEAR Model GSM712/GSM712F Managed Gigabit Switch. Topics include:

oTroubleshooting chart

oAdditional troubleshooting suggestions

Troubleshooting Chart

Table B-1 lists symptoms, causes, and solutions of possible problems.

Table B-1. Troubleshooting Chart

Symptom	Cause	Solution

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 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 and make sure that the
		plug is properly inserted and locked into the port at both the
		switch and the connecting device.
		Make sure all cables used are correct and comply with
		Ethernet specifications. See Appendix F.
		Check for a defective adapter card, cable, or port by testing
		them in an alternate environment where all products are
		functioning.
File transfer is slow or performance	Half- or full-duplex setting on the	Make sure the attached device is set to auto negotiate.
degradation is a problem.	switch and the connected device
	are not the same.
A segment or device is not recognized as	One or more devices are not	Verify that the cabling is correct. Be sure all connectors are
part of the network.	properly connected, or cabling does	securely positioned in the required ports. Equipment may
	not meet Ethernet guidelines.	have been accidentally disconnected.
FDX LED is blinking yellow excessively.	Collisions are occurring on the	Some collisions are normal when the connection is
	connected segment.	operating in half-duplex mode.
	Duplex modes are mismatched.	Recheck the settings of the device attached to the RJ-45
		port. Make sure the attached device is set to auto
		negotiate.
ACT LED is flashing continuously on all	A network loop (redundant path)	Break the loop by ensuring that there is only one path from
connected ports and the network is	has been created (see Figure 2-3).	any networked device to any other networked device.
disabled

Additional Troubleshooting Suggestions

If the suggestions in Table B-1 do not resolve your problem, refer to the troubleshooting suggestions in this section.

Network Adapter Cards

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

Configuration

If problems occur after altering the network configuration, restore the original connections and determine the problem by implementing the new 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

If required, 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. In North America, call 1-888-NETGEAR. If you are outside of North America, please refer to the support information card included with your product.

Auto Negotiation

The 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 only determines the speed correctly and the duplex mode defaults to half-duplex.

The gigabit port on the Gigabit module negotiates speed, duplex mode, and flow control, provided that the attached device supports auto- negotiation.

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