Yes, I remmeber the first one of those I worked with back in the
80's. Our facility had offices in front and a warehouse in the back.
There was this small room back in the warehouse so we took it over and
put the ups in it. Day one we figured out that it was hot as hell in
that little room. Noisy too. Fortunately it was on an outside wall
so we made a hole inthe wall and added an ac.
On Thu, 17 Feb 2011 07:22:57 -0800 (PST), jamesgangnc
Even a lot of the "larger" UPS units work that way. There are
"standby" units (the cheap kind with switch-over drop-out), Line
interactive (which switch over very quickly, using zero crossing
switches or similar tech) and there are the genuine on-line, or "dual
conversion" units the have absolutely no change-over or drop-out - and
you pay accordingly.
I would agree that you probably could use a newer / better UPS with a
faster or no switching time. It is also possible that the DSL modem's
cheap power supply has inadequate filter caps, or they are cheap and
have failed. A new power supply may solve the problem, or adding a big
cap as you indicated should also allow it to ride through a few cycles
of outage while the UPS switches.
Seriously, We don't even know the voltage of the supply except its
suppose to be 12 at rated current
output. Its easy to fry something. Unregulated outputs go up over 16
As I said, pulling the plug on the UPS will narrow down the problem
I'm worrying some other telephone line problem can occur during a
failure, up setting the modem. Many devices also warn of reconnecting
a wall-wart supply while still active.
Using a cheap stand-by "almost" power converter?? (that's what APC
stands for)? Many of the cheap standby units have lousy transfer
times. Short of changing UPS units, the large 25 volt capacitor wouls
likely be the most effective solution. Don't whimp out and use a 12
volt. 16 would be OK, but a 25 will last a whole lot longer (you are
looking at unfiltered rectified ac, not clean DC on those power
I have a few wall warts with switching power supplies but many are
still transformers. It's easy to tell, the ones with switching
circuits instead of transformers are usually lighter and have a higher
current rating. Another giveaway is that many of the switching ones
accept anything from 100vac to 220vac.
Possibly - but there are a LOT that are non-regulated rectified
transformers - all the regulation is done in the device itself. Using
a 12 volt cap would be borderline, regardless. I would ALWAYS
over-rate by a minimum 25%. (which would be minimum 15 volts - closest
commercial value being 15vdc)
Well, I did more testing. I unplugged the UPS and both computer and
modem continued to function properly. So, I tried a bunch of quick
unplug/plugs of the UPS. Everything continued to work. At this
point, I'm tending to blame the ISP. Here's why. Verizon used to
be the provider ... now, it's Frontier. I know, in Verizon days,
last year, that a power outage would kill the telephone service. I
get service from a remote vault about 2 miles down the road. During
a long power/phone outage, I went down to the remote and talked to
the telephone guy that was dispatched to the remote site. He said
that the batteries were junk and Verizon didn't want to spend the
money to replace them because they knew the Frontier sale was just
around the corner. Funny thing, during that long power outage, DSL
still worked. It apparently comes from the same remote site, but
probably uses different batteries or gets its power differently.
Now, I just have to monitor the outages in the future and possibly
report the problems to Frontier. I've heard both good and bad about
Frontier's response to problems.
On Thu, 17 Feb 2011 15:21:40 -0500, Art Todesco wrote:
My son was complaining every time the power dipped his PC would shut down
even though it is plugged into an APC Back UPS 1000VA unit. I held the on/
off button for a self test of the battery and he was right. His monitor
stayed on but the PC shut off. I changed the outlet the PC was plugged
into, redid the test and the PC stayed on. And it was plugged into a
battery back up outlet! Go figure that one out. And if I recall that
outlet that no longer supplies ac on battery used to supply while on
battery just fine because it was formerly mine. I have four identical
units. One on my 50" LED TV, one on the A/V and cable DVR equipment, one
in my bedroom and one in my son's. All are self tested weekly and as far
as the Powerchute software reports all still have good batteries after 7
I'm feeling lonely here. No UPS's on my PC, modem, TV, A/V or TIVO.
in decades of use, not one instance where I lost anything or had a
due to power outage. But then, I'm living in the typical house, not
House situation room..... That would seem to be one of the few places
might want a UPS on the TV and stereo and where you'd go around
On 02/17/2011 06:34 PM, email@example.com wrote:
There's a vast difference in power quality in different areas around the
country. When I lived in Ohio I just didn't even think about power
outages. When I lived in MD, it was a near daily occurrance. Now in
VA, it goes out occasionally, but usually only after a horrific storm,
and then it's right back on again. Just like pretty much everywhere
I've lived, the phones... just... worked. Except when I moved to VA and
had to deal with Verizon... combusting anuses...
replace "roosters" with "cox" to reply.
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