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Old November 10th 06, 01:11 PM posted to microsoft.public.windowsxp.basics
w_tom
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Posts: 373
Default Is Zone Alarm necessary with a DSL firewall?

DanS wrote:
Many people don't realize that a quality UPS, not necessarily a huge one,
just not a super-cheapy, have benefits beyond poer backup. They will
protect as a surge protector as well as act as a line 'conditioner'. You
know, like the $150 Monster surge protector/conditioners they try to sell
you when you by a flat panel TV. ...


The plug-in UPS connects AC mains directly to electronics when not in
battery backup mode. Where is power conditioning? It does not exist.
A relay does not 'condition' electricity. When does that electronics
see most 'dirty' electricity? When UPS is in battery backup mode. For
example, this UPS outputs as 120 volts: two 200 volt square waves with
a spike of up to 270 volts between those square waves. AC mains
provide 120 V sine wave and no spikes; much 'cleaner'. UPS in
battery backup mode outputs a waveform so 'dirty' as to even damage
some small electric motors. But computers are so robust that a 200
volt square wave and spike does no harm.

They are called 'computer grade' UPSes. So where is this power
conditioning? UPS provides 'cleanest' power when relay connects
electronics directly to AC mains. Where is this power conditioning?
Well where are its numerical specifications that claim such
conditioning? UPS numerical specifications 'forget' provide
numbers such as THD. Rumors claim 'power conditioning' that is
not in that numerical spec sheet.

Where is surge protection? Well it does provide protection from one
type of surge that is typically not destructive. Do we assume it
protects from ALL types of surges? Of course not. And yet that is
what many do when claiming a cheap UPS provides 'surge protection'.
They forget to mention the destructive type of surge it does not
protect from.

Again look at its numerical spec sheet. Where are numbers that
define protection for each type of surge? Numbers do not exist. As
required, a joules number is provided. That vaguely defines surge
protector life expectancy. The UPS - like a $160 Monster Cable
protector - does not even claim to protect from surges that typically
cause electronics damage.

A cheap UPS provides one function - protects data from damage by
blackouts and extreme brownouts. UPS protects data when power fails.
Notice its 'dirty' power during battery backup mode. Computer will see
some of the 'dirtiest' electricity from a UPS that is not a power
conditioner. UPS is battery backup power to protect data - nothing
more.

Get and post numeric specifications if you have a problem with these
facts. Damning numbers for those who assumed a 'computer grade' UPS
does more than battery backup.

Meanwhile, that $160 Monster Cable product does same functions found
in a $10 protector sold in the grocery store. But again, show me their
numbers? Monster Cable protectors - like their wires and connectors -
hype myths to the naive.

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