Re: Good UPS for network equip?

From: w_tom (w_tom1_at_hotmail.com)
Date: 07/21/04 

Date: Wed, 21 Jul 2004 18:09:10 -0400

  How do you activate a computer's master reset after computer
has locked? Either press the master reset button, or power
down and up. Nowhere did this master reset solution indicate
bad power. Demonstrated is that a suspected internal hardware
problem can be cleared by the router's master reset circuit.
A circuit that operates only when powered off then on.

  Now what causes the internal computer and logic to lock up?
And what specific diagnostic points to power problems?

  Your symptoms only demonstrate that lockup can be
temporarily eliminated by a master reset. What diagnostic
program points specifically to power as reason for problem?

  Did you run the comprehensive diagnostics as described in a
previous post? If not, then experience from a few decades
says you are still 'spinning wheels'. Provided in that
previous post is how to obtain the missing and necessary
facts.

  For example, is problem in the router or is it something
else? Based upon what was posted, we still don't even know
that. Described were comprehensive tests executed from NIC
to NIC both via a router and without the router. So far, I
only read enough information to 'speculate' that the router
might be a problem. And what kind of router? What is the
networking type? 10Base2? Conventional 100 Mhz Ethernet?
Whose router? For that matter, is it a router or a hub?

  Currently posted is no single reason to suspect power as
reason for failure. Currently posted are reasons to believe
that a master reset inside router can clear the lockout. But
that still does not say whether the master reset clears a
problem internal to the router or a problem with a connected
NIC. Run those manufacturer diagnostics and use alternative
cabling to obtain useful facts. Currently provided is only
enough information to speculate or to define necessary future
tests.

  For example, problem can be created if a long ethernet cable
is not assembled using the correct matching pair of wires.
And a master reset could clear that 'miswired cable' created
lockout. Only one of many possibilities since we still don't
have accurate facts such as results of diagnostic tests.

  In the meantime, does a typical plug-in UPS clean power into
a router? No. Despite the many myths to the contrary, the
UPS connects router directly to AC mains when not in battery
backup mode AND may expose router to the dirtiest of
electricity when in battery backup mode. Plug-in UPS is not
the power condition you might wish it was.

DaveC wrote:
> When powering off the router and back on is the only way to bring
> the network back up again, this points to dirty power. I don't
> change cables, or reboot the computer, or dust off the router to
> bring up the network, I power cycle the router. It is the only
> way to fix the "lockup".
>
> The router has been replaced once, hoping that it was defective.
> Symptom remained unchanged.
>
> I'm open to other suggestions, but my diagnostics points to a
> power problem.

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