3845 Router with 48 port fast ethernet switch module fan speeds

jonesandrew · ‎07-29-2009

Hi,

ive been trying to find the temperatures at wich the fans on the 3845 router will engage the highspeed fans?

as we have some of these routers installed at branch offices, and they are engaging the loud fans. we are trying to determine at what temp this is supposed to happen, so we can devise a cooling solution to keep them quiet.

Thanks,

Andrew

Leo Laohoo · ‎07-29-2009

Hi Andrew,

I believe the 3845 fan speed only has one setting: loud.

It is done on purpose to keep the components cool.

jonesandrew · ‎07-29-2009

it does have variable speeds, occaisonally you would hear the router fire up louder for a few moements, then quiten down a little.

paolo bevilacqua · ‎07-31-2009

Hi, cisco specifies 58 dBa maximum:

http://www.cisco.com/en/US/prod/collateral/routers/ps5855/prod_brochure0900aecd8019dc1f.pdf

You have to design router installation for the worst case figure. In any case, none of the ISR routers from 2801 and above are intended to be in the same area as humans.

Leo Laohoo · ‎07-29-2009

Hi Andrew,

You are not talking about during the startup or bootup process are you?