Real world router troublehooting for you guys

vanquish23

I worked with a customer today on his remote router. He is in the middle east up in the mountains were during the winter it gets below frezzing and they had a blizzard over the weekend.


Anyway, I was helping him do a password recovery. I had already verifed his Hyper Terminal Com settings and cable. The labtop would send the break signal, but would not type in Rommon mode. After it warmed up later on during the day the router would type commands in Rommon. At first I thought the Rom image was bad, but everything was fine then.

So if you ever read the enviromental specs, know that when its below frezzing that is why. I know most people work with the equipment indoors in a controlled enviroment.

martell1000

thats interesiting.

i wonder if this can be "triggered". we are having a cold wave in europe at the moment. maybe i will put a router on the balcony over night and try to console to it tomorrow...

sizeon

Thanks for the information. I am sure this will be useful.

fsanyee

Check the environmental specs of the router. I think operationg temp is usually 32° to 104°F (0° to 40°C).

MrXpert

That doesn't surprise me much.
to be honest this applies to nearly every electrical appliance. Even Fridges cannot be used below certain temps although there are very few brands out there that are designed to. That's why when for example you have delivered an electical appliance such as a VCR or TV it is good practice to let it reach room temperate before actually plugging it in. This give the chance for condensation and the like to go away. I learnt this when I was ten years old back in the day when buying a particular brand of VHS tape mattered to me and how it performed.

All in all thanks for the heads up though as it is a good tip

alxx

Definately need to keep an eye on operating temps, humidity ,altitudes and pressure.

For some equipment operating temps change with altitude usually de-rated

Also with high altitudes you can get cosmic ray events(bit flipping) and not just in aircraft/satellites

A few chip manufacturers do testing for cosmic ray events in Boulder Colardo as its 1.6km up.
Field testing for cosmic ray soft errors in semiconductor memories | Mendeley

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Cosmic ray - Wikipedia, the free encyclopedia
Radiation hardening - Wikipedia, the free encyclopedia

For 2600's(and 2600xm's)
Cisco 2600 Series Modular Access Routers* [Cisco 2600 Series Multiservice Platforms] - Cisco Systems



Operating Temperature
32° to 104°F (0 to 40°C)





Nonoperating Temperature
-40° to 158°F (-40° to 70°C)





Relative Humidity Noncondensing
5-95 percent




Operation Altitude (derate 1°C per 1000 ft)
Up to 6500 ft (2000m) @ 40°C



where as for the 3800's the max humidty is lower
Cisco 3800 Series Integrated Services Router* [Cisco 3800 Series Integrated Services Routers] - Cisco Systems

where as 1841


Environmental


Operating Temperature
32 to 104°F (0 to 40°C)


Operating Humidity
10 to 85% noncondensing operating; 5 to 95% noncondensing, nonoperating


Nonoperating Temperature
-4 to 149°F (-25 to 65°C)


Operating Altitude
10,000 feet (3000 meters) @ 77°F (25°C)


Noise Level
Normal operating temperature:
• <78° F/26°C: 34 dBA
• >78°F/26°C through <104°F/40°C: 37 dBA
• >104°F/40°C: 42 dBA




comsic ray effects on cisco routers
Radiation Effects on CISCO Mini Router


Can the interrnet survive a cosmic ray event ? Jan 27 2012
Cisco Blog » Blog Archive » Can the Internet Survive A Cosmic Ray?

Cosmic radiation comes to ASIC and SOC design - 2005-05-12 07:00:00 | EDN