Troubleshooting; Basic Troubleshooting Tips - HP OfficeConnect 1405 Series Installation And Getting Started Manual

Troubleshooting

C a u t i o n
This chapter describes how to troubleshoot your 1405-5 Switch, 1405-5G
Switch, 1405-8 Switch, and 1405-8G Switch. This document describes
troubleshooting from a hardware perspective.
This chapter describes the following:
■

basic troubleshooting tips

diagnosing with the LEDs
■
■ hardware diagnostic tests
■ HP Customer Support Services
Basic Troubleshooting Tips
Most problems are caused by the following situations. Check for these items
first when starting your troubleshooting:
Connecting to devices that have a fixed full-duplex configuration.
■
The RJ-45 ports are configured as "Auto". That is, when connecting to
attached devices, the switch operates in one of two ways to determine the
link speed and the communication mode (half duplex or full duplex):
• If the connected device is also configured to Auto, the switch will
automatically negotiate both link speed and communication mode.
• If the connected device has a fixed configuration, for example
100 Mbps, at half or full duplex, the switch will automatically sense
the link speed, but will default to a communication mode of half
duplex.
Because the switches behave in this way (in compliance with the IEEE
802.3 standard), if a device connected to the switch has a fixed
configuration at full duplex, the device will not connect correctly to the
switch. The result will be high error rates and very inefficient
communications between the switch and the device.
Ensure all devices connected to the switches are configured to auto
negotiate, or are configured to connect at half duplex (all hubs are
configured this way, for example).
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