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Chapter 9 System Troubleshooting; Troubleshooting The Configuration; No Information Is Displayed On The Terminal; The Displayed Characters Are Illegible - 3Com Switch 7700 Installation Manual

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Chapter 9 System
Troubleshooting
Although the Switch 7700 has passed comprehensive and strict tests before delivery, faults may occur due to
improper installation. This chapter describes how to troubleshoot.
The simplest way to diagnose a fault is to check the system status LEDs on the Fabric modules. In addition, with the
DeviceMgr network management system, you can also locate the fault through management software.

9.1. Troubleshooting the Configuration

After the switch is powered on booting information is displayed on the configuration terminal. If the configuration
system has failed, there is no screen display at the configuration terminal or the displayed characters are illegible.

9.1.1. No information is displayed on the terminal

After the Switch 7700 is powered on, if there is no information displayed on the terminal, check that:
If this procedure does not reveal the problem, check that the console cable is properly connected and that the
configuration terminal is set correctly.

9.1.2. The displayed characters are illegible

If the displayed characters are illegible, the parameters of configuration terminal may not have been set correctly.
Perform the corresponding examinations, referring to Configuration on page 37.

9.2. Troubleshooting Power

If the power LED OK is off, there may be something wrong with the system power supply. Check that:
Table 30 Power LEDs on the Fabric
Indicator
OK
The power system is working normally.
The Fabric is working normally.
The console cable has been connected to the console port in the Fabric.
The power module has been installed in the position to ensure normal communication
with the backplane.
The switch power has been turned on.
The power cord has been properly connected.
The source voltage is correct.
On — the power works normally.
State Description
53

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