[c-nsp] 7200-I/O high inlet/outlet temperature

[Brian Feeny]

I am having one of our NPE-G1/7200VXR routers reload unexpectedly the  
last few days.
One of the things I noticed was that the I/O module is throwing  
environmental alarms:

00:00:15: %ENVM-4-ENVWARN: I/O Cont Outlet measured at 42C/107F
01:00:51: %ENVM-4-ENVWARN: I/O Cont Outlet measured at 42C/107F

The normal operating range for an I/O Cont according to Cisco is 104F  
max.

Whats interesting, is the G1 reports its inlet/outlet as OK:

dal-lone-gw1#show environment al
Power Supplies:
         Power Supply 1 is Zytek AC Power Supply. Unit is on.
         Power Supply 2 is Zytek AC Power Supply. Unit is on.

Temperature readings:
         NPE Inlet        measured at 33C/91F
         NPE Outlet       measured at 34C/93F
         I/O Cont Inlet   measured at 36C/96F
         I/O Cont Outlet  measured at 42C/107F :Temperature in Warning  
range!

Voltage readings:
         +3.45 V       measured at +3.47 V
         +5.15 V       measured at +5.23 V
         +12.15 V      measured at +12.24 V
         -11.95 V      measured at -11.85 V

Since the I/O module has no fans of its own, I would think that if the  
problem was indeed
an environmental problem in the cabinet, it would effect the G1 as  
well.  In any case
I am looking to approach this two ways, first increase the airflow in  
the cabinet, and if that
doesn't fix it, then swap out the I/O Controller.

Has anyone battled this type of issue before, where the NPE temperature  
is fine, but the I/O
is in alarm?  Was your I/O reloading?  Heat causes very strange  
problems with computers,
and if its indeed an environmental issue, then the DE is probably  
pulling his hair out looking
at the stack trace on this one........

Brian

------------------------------------------------------------------------ 
------
Brian Feeny, CCIE #8036, CISSP    	e: signal at shreve.net
Network Engineer           			p: 318.213.4709
ShreveNet Inc.             			f: 318.221.6612