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7
Troubleshooting
Although the S7500E series have passed the comprehensive and strict test before delivery, faults may
occur due to improper installation. This chapter describes how to handle faults caused by improper
installation.
On the SRPU of the S7500E series, you can find the status LEDs of LPUs, power modules, and fans.
You can check these status LEDs to locate faults.
The LEDs on the standby SRPU of the S7500E series are always OFF except the SRPU LED. The
SRPU LED on the standby SRPU is in the same state as that on the active SRPU. Thus, you need not
consider the LEDs on the standby SRPU when troubleshooting power modules, fans, or LPUs.
Troubleshooting the Configuration System
After the switch is powered on and the system is normal, the booting information will be displayed on the
configuration terminal. If the configuration system has failed, the configuration terminal may display
illegible characters or nothing at all.
No Display on the Terminal
After the switch is powered on, if no information is displayed on the terminal, check if:
The power system works normally.
SRPU works normally.
The console cable is connected to the console port of the SRPU.
If no problem is found after the above check, check if:
The serial port connected to the console cable is wrong. (The port in use is not the one set on the
terminal.)
The configuration of parameters on the terminal is wrong.
Correct parameter configuration is listed as follows:
–Bits per second: 9600
–Data bits: 8
–Parity: None
–Stop bits: 1
–Flow control: None
–Terminal emulation mode: VT100
Something is wrong with the console cable.
7-1
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Troubleshooting
