3com 3C16894 4-slot Chassis 用户手册

This chapter covers the following topics:

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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.

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.

If there is no information displayed on the terminal after the Switch 7750 is 
powered on, check that: 

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The power system is working normally.

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The Fabric is working normally.

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The console cable has been connected to the console port in the Fabric.

If this procedure does not reveal the problem, verify that the console cable is 
properly connected and that the configuration terminal is set correctly.

If the displayed characters are illegible, the parameters of configuration terminal 
may not have been set correctly. See Setting Terminal Parameters on page 49. 

If the Power OK LED is off, there may be something wrong with the system power 
supply. Check that: 

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The power module has been installed in the correct position to ensure normal 
communication with the backplane. 

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The switch power has been turned on.

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The power cord is connected properly.

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The source voltage is correct.