Managed Layer 2 Switches GSM7224R and GSM7248R Hardware Installation Guide

Table 3-1. Troubleshooting Chart (continued)

Problem

Cause

Solution

 

 

 

A segment or device is not

One or more devices are not

Verify that the cabling is correct. Be sure

recognized as part of the

properly connected, or cabling

that all connectors are securely positioned

network.

does not meet Ethernet

in the required ports. Equipment might have

 

guidelines.

been accidentally disconnected.

 

 

 

ACT LED is flashing

A network loop (redundant

Break the loop by ensuring that there is only

continuously on all connected

path) has been created.

one path from any networked device to any

ports, and the network is

 

other networked device.

disabled.

 

 

 

 

 

Additional Troubleshooting Suggestions

If the suggestions in Table 3-1do 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.

3-2

Troubleshooting

v1.0, November 2007

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NETGEAR GSM7248R manual Additional Troubleshooting Suggestions, Network adapter cards