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Re: Resiliency of communication channels

Cross-posted to 2 groups.

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On 2025-08-19 18:51, Bobbie Sellers wrote:
> On 8/19/25 04:55, Carlos E.R. wrote:
>> On 2025-08-15 22:28, rbowman wrote:
>>> On Fri, 15 Aug 2025 12:09:23 +0200, Carlos E. R. wrote:
>>>
>>>> Some UPS claim that the batteries last 4 years, but in my experience
>>>> they last 2. There is the possibility that brand name batteries are
>>>> actually better and last 4 years.
>>>>
>>>> Many UPS don't say the status of the battery, you have to actually test
>>>> them manually with a stop watch. They may have a display, but that one
>>>> may be difficult to see when the UPS is out of sight. Only some UPS can
>>>> be connected to a computer for monitoring.
>>>
>>> I've had good luck with APC. I haven't set it up but it does have a USB
>>> connection for monitoring. Their PowerChute software specifies RHEL or
>>> SUSE now instead of only Windows but I assume there is a general Linux
>>> solution.
>>>
>>> One thing we found at work where the larger sample size meant more
>>> instances of bad batteries is a box plugged into the wall will survive a
>>> brief flicker; one plugged into a UPS with a bad battery goes down hard.
>>
>> I'm happy with Eaton. I have one (managed) powering this desktop (has 
>> 2*12 batteries), and I bought another (not managed) for my router, 
>> just one 12v battery. I think it beeps when battery is bad, we'll see.
>>
>> The new one at the router is not managed, but I don't have a permanent 
>> computer there to manage it, anyway.
>>
> 
>      When I had a C_64 and was doing accounting for friend I had to buy
> a line conditioner. It helped improve the reliabilty of the power going 
> to the
> little computer.  I went on to the Amiga and a modern(?) switching power
> supply.  I considered getting UPS but could not come up with the price.
> In the mid-2000s maybe 2005 I got my first x86 laptop and have stuck
> with laptops because they include their own batteries.  I thnk all other
> form factors which do not have UPS should have their own batteries
> internally. It would save a lot work recovering from brown out and
> power shut downs in some areas.

My problem is that the "earth leakage circuit breaker" (which is 
mandatory for all houses here) is trigger happy. I have replaced it a 
month ago it with a "super immunized model type A" and auto rearm. So 
far it has not triggered. The history is that normal ones can trigger 
with computer supplies and the inverters in modern house motors (washing 
machine, fridge, AC...).

And if it triggers, it will attempt to reconnect after 9 seconds. Next 
retry 59S and next 299S). I just need the computer to survive the first 
one. But it hasn't happened yet. Fingers crossed. :-)

>      I am lucky in that in San Francisco I happen through lucky
> chance to be on the same power line as the St.Francis Hospital
> 3 blocks further up Nob Hill. Very seldom do I experience power
> failures but it can happen.  A side note is that the last time I remember
> it happening was when a Trolley bus shorted out 800 V DC power to
> a local streetlamp and wiped out all the wiring in the utility vault.

I guess that DC mains shorted to AC mains wins. All the coils are just 
cable to it. :-D


>      It took most of the day for the maintanance crews to pull
> fresh wiring into the buildings served by that vault.  I could not
> get to the net as the modem/router had no power but I lost no
> work.  And just maybe because of my high quality power strips
> I lost no appliances.  In the adjacent apartment their TV was
> wasted by the surge.
> 
> bliss- Dell Precision 7730- PCLOS 2025.08- Linux 6.12.42-pclos1- KDE 
> Plasma 6.4.4
> 


-- 
Cheers, Carlos.

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Thread

Resiliency of communication channels (was: Re: Real-time OSs (Re: Microsoft Is Abandoning Windows 11 SE)) Nuno Silva <nunojsilva@invalid.invalid> - 2025-08-15 10:55 +0100
  Re: Resiliency of communication channels "Carlos E. R." <robin_listas@es.invalid> - 2025-08-15 12:09 +0200
    Re: Resiliency of communication channels The Natural Philosopher <tnp@invalid.invalid> - 2025-08-15 14:08 +0100
    Re: Resiliency of communication channels rbowman <bowman@montana.com> - 2025-08-15 20:28 +0000
      Re: Resiliency of communication channels "Carlos E. R." <robin_listas@es.invalid> - 2025-08-15 23:20 +0200
      Re: Resiliency of communication channels "Carlos E.R." <robin_listas@es.invalid> - 2025-08-19 13:55 +0200
        Re: Resiliency of communication channels Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2025-08-19 09:51 -0700
          Re: Resiliency of communication channels "Carlos E.R." <robin_listas@es.invalid> - 2025-08-19 21:12 +0200
  Re: Resiliency of communication channels The Natural Philosopher <tnp@invalid.invalid> - 2025-08-15 14:06 +0100
    Re: Resiliency of communication channels Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-08-15 18:26 +0000
      Re: Resiliency of communication channels The Natural Philosopher <tnp@invalid.invalid> - 2025-08-15 19:54 +0100

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