Juniper Networks ERX Hardware 8 - Manual (Page 132)

ERX 8.0.x Hardware Guide
Table 15: Troubleshooting High-Temperature Conditions (continued)
Cause of High Operating
Temperature
Symptoms Resolution
Cooling fan failure FAN OK LED on SRP module is
not illuminated.
FAN FAIL LED on SRP module
is illuminated.
Replace fan tray. (See “Maintaining ERX
Routers” on page 85.)
Module failure FAIL LED on module is illuminated. Replace module. (See “Installing
Modules” on page 35.)
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 module reset button to reset the module. See Figure 9.
If a line module fails to respond for an extended time, that module might
have a software problem. You can depress the software reset button with a
paper clip to suspend the current software task. Depending on the situation,
this action might also reset the software on the module.
If depressing the software reset button fails to correct the issue with the line
module, depress the module reset button to reboot the line module.
The buttons work in the same way for the SRP module. Depressing the
module reset button on an SRP module is equivalent to rebooting the
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:
If ECC detects a single-bit error, it automatically corrects the error, and
operation continues.
If ECC detects a double-bit error, it logs the error, stops the main processor on
the controller, and takes the SRP module offline.
Detecting Double-Bit Errors
The following message appears on the console if ECC detects a double-bit error:
114 Double-Bit Errors on SRP Modules