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CHAPTER 10
Troubleshooting
10-10
When you have resolved the cause of the high temperature, you must
power cycle the system to reset the modules.
Resetting Line Modules and SRP Modules
Two recessed buttons on line modules and SRP modules provide the
mechanisms for resetting. You can use the NMI button to reset the
software on the module and the board reset button to reset the module.
See Figure 1-12.
If a line module fails to respond for an extended time, there may be a
software problem with that module. You can depress the software reset
button with a paper clip to suspend the current software task. Depending
on the situation, this action may also reset the software on the module.
If depressing the software reset button fails to correct the issue with the
line module, depress the board reset button. This action reboots the line
module.
The buttons work in the same way for the SRP module. Depressing the
board reset button on an SRP module is equivalent to rebooting the
E-series router and causes all the line modules to reboot.
Double-Bit Errors on SRP Modules
SRP modules include error checking and correction (ECC) to protect
their SDRAM. ECC provides error detection of single-bit and double-bit
errors and correction of single-bit errors for the SDRAM as follows:
Table 10-6 Troubleshooting high-temperature conditions
Cause of High Operating
Temperature
Symptoms Resolution
Air vents to system are blocked Space around system does not meet
specifications (see Chapter 11,
System Specifications).
Increase space around system.
Ambient temperature exceeds
specifications
Ambient temperature exceeds
specifications (see Chapter 11,
System Specifications).
Provide extra cooling or heating in
the room where the system is
located.
Cooling fan failure • FAN OK LED on SRP module is
not illuminated.
• FAN FAIL LED on SRP module is
illuminated.
Replace fan tray (see Chapter 9,
Maintaining E-Series Routers).
Module failure FAIL LED on module is illuminated. Replace module (see Chapter 5,
Installing Modules).