Re: Good UPS for network equip?
From: jsmith (juddo_at_ix.netcom.com)
Date: 07/24/04
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Date: Sat, 24 Jul 2004 08:45:42 -0400
Possibly a ferroresonant line conditioner might help in this situation.
"w_tom" <w_tom1@hotmail.com> wrote in message
news:4100EF39.9546A907@hotmail.com...
> You see no evidence that a cable has lockup up the router
> because you have not yet run those comprehensive
> diagnostics. You are not doing what your car mechanic must
> do to not be sued. You are not doing what your doctor does
> before perscribing medicine. You are speculating this must be
> a power problem only becasue the routers master reset cleared
> the problem. First thing you should have done is run those
> diagnostics. Make the intermittent into a solidly repeateable
> problem.
>
> Again, do you know the cables are wired correctly
> internally? Did you run comprehensive diagnostics to see the
> problem, then swap out with a know good cable, run the
> diagnostic again, and see no failure? From the symptoms as
> described, a long list of reasons could create the problem.
> One of those reasons is most likely in a low bandwidth
> environment. One of many reasons for lockup would be a cable
> not properly assembled. Network would work sometimes; then
> eventually lock up. Lockup is then cleared by the router
> master reset that only occurs with power removal. And this is
> only one of many possible reasons for the failure.
>
> With this one type of failure, you could ping all you want
> and that still would not create the failure. Again, I
> probably have a generation plus experience on you with this
> stuff. Experience based upon design - not just simplistic
> part swapping. Having been there, the quickest and most
> reliable solution to this problem was provide previously -
> including the loope. Having experience, the only reason a
> power glitch can cause your problem is if that entire line of
> routers is defective by design. Defect in all routers of that
> design which means that router works in 99 locations and
> becomes intermittent in one. Your symptoms are also of
> problems that have nothing to do with power. If you had a
> problem created by power, then the entire line of routers is
> defective - and you used a better design.
>
> You did verify power by running an extension cord between
> outlets so that a meter can confirm wiring? If power was a
> problem, then the meter is the first thing you used to confirm
> building wiring (and no, those little cubes with three lights
> would not detect the type of failure you were looking for).
>
> Diagnostics are so simple to obtain and execute that it
> takes longer to make a second trip to that office.
> Diagnostics were created to solve just this type of problem.
>
> In the meantime, what did the lights on the router for each
> cable and on each NIC report both during operation and during
> the outage. Once problem happens, then which computers can
> ping or not ping which other computer (which is why you left a
> batch file script on the desktop of each machine so that the
> user can execute that test and report back).
>
> Possible reasons for your failure: miswired cable.
> Impropely connected RG-45 plug to cable. Serious safety
> ground problem with the office wiring. Defective
> (intermittent) NIC in any one computer.
>
> Restarting electronics will always cure the intermittent.
> Clearing failure is the job of the master reset circuit that
> all computer electronics must have. A defective state machine
> is always reset by the master reset; therefore the
> intermittent is always cleared. That does not say anything
> about power. It only says the master reset circuit works.
>
> DaveC wrote:
> > Environment: small 4-person medical office. These are not huge
> > bandwidth-using people.
> >
> > Equipment: 1 PC, 3 Macs connected via 10-baseT to Netgear RP614v2
> > router. Router firmware is current release.
> >
> > Symptoms:
> > 1. Every 2 weeks, or so, suddenly no one connected to the router
> > can access the 'net. No one was attempting to use the internet
> > at the time of the failure, they just found that their computer
> > couldn't print to the network printer. I can ping the "immediate"
> > router (that their computer is plugged into), but not the one
> > beyond (that the printer and DSL router are plugged into).
> >
> > Replaced the router, as it seemed defective.
> >
> > Then, on one weekend, an office worker was present when the "lights
> > flickered", and network symptom occurred. I started thinking about
> > power problems, and office workers confirmed that the lights would
> > flicker several times a week.
> >
> > Restarting the router fixes the symptom, every time it occurs.
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