Re: Surge protection for Cisco 1720 Router
- From: "Richard Urban [MVP]" <richardurbanREMOVETHIS@xxxxxxxxxxx>
- Date: Fri, 26 Aug 2005 22:53:42 -0400
Can you not have a "non catastrophic" surge, say of 15-50 volts? Will not a
decent UPS system that monitors the incoming power, work to reduce that
momentary surge so as the power to a device remains within spec? How about a
power "brownout"? My UPS notifies me of these and I can shut down the
computer before I run out of battery power.
I have placed a HP chart recorder on my 120V supply line and record both
supply power and UPS output to the computer. I see supply power anywhere
from 104V to 132V, under normal and everyday conditions. Yet a second
recording channel, monitoring my computer power, stays rock solid at 117V.
Every surge is not a lightning strike!
--
Regards,
Richard Urban
Microsoft MVP Windows Shell/User
Quote from: George Ankner
"If you knew as much as you think you know,
You would realize that you don't know what you thought you knew!"
"w_tom" <w_tom1@xxxxxxxxxxx> wrote in message
news:430FA4F9.DE234849@xxxxxxxxxxxxxx
> The naive will try to claim a protector or plug-in UPS is
> protection. IOW they would have you believe that less than
> one inch part inside will stop, block, or absorb what even
> three miles of sky could not.
>
> We routinely suffer direct lightning strikes without
> damage. But no protector will block or absorb that transient
> - except where myths are promoted. Another has sent you to a
> manufacturer of ineffective protectors.
>
> Your telco has overhead wires everywhere in town connected
> to a $multi-million computer. Do they shut down with every
> thunderstorm to protect their machine? Of course not. Do
> they install protectors on every phone line to block surges.
> Of course not. They do as Ben Franklin demonstrated in 1752.
>
> Protection is earth ground. Every incoming utility wire
> must be earthed before it can enter the building. Earthing
> either by hardwire connecting that wire to earth OR by
> installing a 'whole house' protector that does same as the
> wire.
>
> Notice what the protector does. It does not stop or absorb
> the transient. Its function is to shunt (divert, connect) the
> transient to earth ground during the transient. Earth ground
> - not the protector - is protection ... as Ben Franklin
> demonstrated in 1752.
>
> Those ineffective plug-in solutions don't even claim to
> provide such protection. How ineffective are they? 1) No
> dedicated connection for the essential and always required
> earth ground, and 2) manufacturer avoids all discussion about
> earthing. Two characteristics of ineffective protectors.
>
> Electronics already contains protection that works on the
> power cord. But this protection may be overwhelmed if an
> incoming utility wire is not earthed before entering the
> building. First establish a single point earth ground for the
> building. Then every incoming utility must make a 'less than
> ten foot' connection to that earth ground.
>
> This is how the telco protects his $multi-million computer.
> This is why commercial radio stations suffer direct strike and
> keep broadcasting. This is why telephone and 911 emergency
> operators don't remove headsets and leave the room when
> thunderstorms arrive. This is what the telco already installs
> on your phone line - for free - because it is so inexpensive
> and so effective. This is how effective protection worked
> even in the 1930s. Don't stop, block, or absorb surges. Earth
> them before a transient can enter the building. And not just
> any earth ground. The building must feature a single point
> ground.
>
> Some figures from industry professionals demonstrate the
> concepts:
>
> http://www.erico.com/public/library/fep/technotes/tncr002.pdf
> http://www.cinergy.com/surge/ttip08.htm
> A figure from the NIST is used to demonstrate damage when
> earthing is not properly installed:
> http://www.epri-peac.com/tutorials/sol01tut.html
>
> Techniques so well proven as to even be part of "Planning
> guide for Sun Server room" Section 5.4.7 Lightning
> Protection (Adobe page 89):
> http://www.sun.com/servers/white-papers/dc-planning-guide.pdf
>> Lightning surges cannot be stopped, but they can be diverted.
>> The plans for the data center should be thoroughly reviewed to
>> identify any paths for surge entry into the data center. Surge
>> arrestors can be designed into the system to help mitigate the
>> potential for lightning damage within the data center. These
>> should divert the power of the surge by providing a path to
>> ground for the surge energy. Protection should be placed on
>> both the primary and secondary side of the service transformer.
>> It is also necessary to protect against surges through the
>> communications lines. The specific design of the lightning
>> protection system for the data center will be dependent on
>> the design of the building and utilities and existing
>> protection measures.
>
>
> Chris Smith wrote:
>> How do I go about providing surge protection for a Cisco 1720
>> router? I have looked all over Cisco's web page and find
>> nothing helpful. Thanks for any help you might give me.
.
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