Heat and Cable modem??

Heat and Cable modem??
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Heat and Cable modem?? Oren 08-20-2006
Posted by Oren on August 20, 2006, 3:01 pm
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I stumbled on this group today and think I'm in the right place.

I'm trying to replicate intermittent cable modem "drops" (what I
believe may be heat related). I have a router, Linksys cable modem
and a wireless Linksys router on my LAN.

The linksys profiles are stackable and I have done that, on top of my
router. The cable modem sits in the middle. I've (yesterday) noticed
the cable modem is hotter that the other two devices, so I unplugged
all and let them sit overnight. Boot 'em all this morning, bang all is
fine. Ten minutes ago the cable modem dropped again and yes, it was
hot again...

I will stop stacking the device this way or put the cable modem on top
and see how that works or mount them separately.

Anybody experience a "heat" issue like this before? The room has AC,
well vented, etc. The temp in the house is 78 - 80 F. I think the
operating temp for the modem is about 104 F, but my guess it was
really hot to act ilke this.

(cooled down and booted now, so I can send this) ...sitting on top...

Thanks...

Oren

Posted by DLR on August 20, 2006, 7:42 pm
Oren wrote:
> I stumbled on this group today and think I'm in the right place.
>
> I'm trying to replicate intermittent cable modem "drops" (what I
> believe may be heat related). I have a router, Linksys cable modem
> and a wireless Linksys router on my LAN.
>
> The linksys profiles are stackable and I have done that, on top of my
> router. The cable modem sits in the middle. I've (yesterday) noticed
> the cable modem is hotter that the other two devices, so I unplugged
> all and let them sit overnight. Boot 'em all this morning, bang all is
> fine. Ten minutes ago the cable modem dropped again and yes, it was
> hot again...
>
> I will stop stacking the device this way or put the cable modem on top
> and see how that works or mount them separately.
>
> Anybody experience a "heat" issue like this before? The room has AC,
> well vented, etc. The temp in the house is 78 - 80 F. I think the
> operating temp for the modem is about 104 F, but my guess it was
> really hot to act ilke this.
>
Yep. Don't stack devices that don't have feet that match "dents" in the
device below.

Posted by Timothy Daniels on August 20, 2006, 9:18 pm

"Oren" wrote:
> I'm trying to replicate intermittent cable modem "drops"
> (what I believe may be heat related). I have a router,
> Linksys cable modem and a wireless Linksys router on
> my LAN.
>
> The linksys profiles are stackable and I have done that...


That's why I went with a Motorola 5120 - the flat profile of
the Linksys warned of potential overheating problems. The
Motorola stands with a vertical profile, and convection works
better to cool the circuit board. Try stacking the components
with more space between them for cool air to come in from
the sides, or better, try standing them on their narrow sides.

*TimDaniels*

Posted by Oren on August 21, 2006, 3:33 pm
On Sun, 20 Aug 2006 18:18:34 -0700, "Timothy Daniels"

>
>"Oren" wrote:
>> I'm trying to replicate intermittent cable modem "drops"
>> (what I believe may be heat related). I have a router,
>> Linksys cable modem and a wireless Linksys router on
>> my LAN.
>>
>> The linksys profiles are stackable and I have done that...
>
>
> That's why I went with a Motorola 5120 - the flat profile of
>the Linksys warned of potential overheating problems. The
>Motorola stands with a vertical profile, and convection works
>better to cool the circuit board. Try stacking the components
>with more space between them for cool air to come in from
>the sides, or better, try standing them on their narrow sides.
>
>*TimDaniels*

Thanks for the replies here. Both Linksys devices have feet and a
space to cool. I moved the cable modem to the top of the stack and
this helped cool it better. Just like yesterday and almost to the hour
the modem dropped out again. I moved the modem off to the side by
itself. As I mentioned before this drops have been off and on for some
time.

This timing thing for the past two days now has me thinking hardware /
cable company problem. The last time I spoke to them, "bad modem" was
the first thing out of the mouth. Previous calls with the same issue
(modem drops)... "the node is being worked on, okay, bye"

The modem may be five years old. I'm going try a hard reset with the
button and paper clip ( come to think of it I have never done a hard
reset on this thing...even moved it across town to another house ).

Oren

Posted by Dave on August 21, 2006, 4:50 pm
Are you sure some of your signal levels aren't on the ragged edge and when
the outside temperature increases it causes the problem? Have you checked
your upstream level, downstream level and signal to noise ratio?




> On Sun, 20 Aug 2006 18:18:34 -0700, "Timothy Daniels"
>
> Thanks for the replies here. Both Linksys devices have feet and a
> space to cool. I moved the cable modem to the top of the stack and
> this helped cool it better. Just like yesterday and almost to the hour
> the modem dropped out again. I moved the modem off to the side by
> itself. As I mentioned before this drops have been off and on for some
> time.
>
> This timing thing for the past two days now has me thinking hardware /
> cable company problem. The last time I spoke to them, "bad modem" was
> the first thing out of the mouth. Previous calls with the same issue
> (modem drops)... "the node is being worked on, okay, bye"
>
> The modem may be five years old. I'm going try a hard reset with the
> button and paper clip ( come to think of it I have never done a hard
> reset on this thing...even moved it across town to another house ).
>
> Oren



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