Resetting Line Modules And Srp Modules; Double-Bit Errors On Srp Modules - Juniper E120 - RELEASE 11.1.X HARDWARE GUIDE 3-25-2010 Hardware Manual

E120 and E320 11.1.x Hardware Guide
Table 13: Troubleshooting High-Temperature Conditions
Cause of High Operating
Temperature
Air vents to system are blocked
Ambient temperature exceeds
specifications
One or more cooling fans have
failed
A module fails
When you have resolved the cause of the high temperature, the system automatically
resumes operation. For example, if the system entered thermal protection mode
and you replaced the fan tray, a chassis reboot is not required. The system
automatically restores power to the LM and SFM modules.

Resetting Line Modules and SRP Modules

Line modules and SRP modules have two recessed buttons that enable you to reset
the software or module. You can use the NMI button to reset the software on the
module and the module reset button to reset the module. See Figure 5 on page 8.
If a line module fails to respond for an extended time, a software problem might
exist with that module. You can depress the NMI 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. This action reboots 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:
86

Resetting Line Modules and SRP Modules

Symptoms
Space around system does not meet
specifications. (See "System Specifications" on
page 91.)
Ambient temperature exceeds specifications.
(See "System Specifications" on page 91.)
FAN OK LED (FO) on SRP module is not
illuminated.
FAN FAIL LED (FF) on SRP module is
illuminated.
FAIL LED on module is illuminated.
If ECC detects a single-bit error, it automatically corrects the error, and operation
continues.
Resolution
Increase space around system.
Provide extra cooling or heating in the
room where the system is located.
Replace fan tray. (See "Maintaining the
Router" on page 69.)
Replace module. (See "Installing
Modules" on page 27.)