No Subject

Now I'm following up to my own posts.

A *polite* hint to manufacturers:

	If you MUST build hardware which requires forced-air cooling to
	operate without damage (I fully understand that density and
	dissipation requirements sometimes require this) then you have 
	an *OBLIGATION* to include temperature monitoring facilities in
	your harware which generate reportable status -- as well as an
	automated overtemp shutdown.

	Anything less should, IMHO, VOID your UL/CSA certification.

	CISCO does this in their larger router products (which will
	definitely croak if the fans fail or air intake is obstructed).
	ASCEND, at least in the MAX, does not (I don't know about the 
	TNT).  But they should.  How much does a thermocouple and a 
	small board to shut off the power supply cost?  $10?  C'mon 
	folks.

We had significant heat dissipation problems with the MAXes when we had 
them here.  In fact, we had to change our racking plan and remove the 
side panels from both end racks in order to obtain rational flow-through
temperature gradients through the chassis.  With the end panels in place 
the operating temperatures of the MAXes were way beyond my comfort level 
for hardware of this type.

IMHO the thermal engineering of the MAX with V.34 modem boards is marginal 
at best. Using DM12s was better than the original DM8s, but not by a lot.
	 
--
-- 
Karl Denninger (karl@MCS.Net)| MCSNet - Serving Chicagoland and Wisconsin
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