UPS


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UPS

UPS

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UPS

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A source level C debugger that runs under X11 or SunView by Mark Russell <mtr@ukc.ac.uk>. Ups includes a C interpreter which allows you to add fragments of code simply by editing them into the source window. Version 2.1.

Ported to Sun, DECstation, VAX Ultrix, HLH Clipper.

ftp://export.lcs.mit.edu/contrib/. Mailing list: ups-users-request@ukc.ac.uk.

Unofficial enhancements by Rod Armstrong <rod@sj.ate.slb.com> ftp://sj.ate.slb.com/misc/Unix/ups/contrib/rob.

UPS

(Uninterruptible Power Supply) A device that provides battery backup when the electrical power fails or drops to an unacceptable voltage level. Small UPS systems provide power for a few minutes; enough to power down the computer in an orderly manner, while larger systems have enough battery for several hours. In mission critical datacenters, UPS systems are used for just a few minutes until electrical generators take over.

UPS systems can be set up to alert file servers to shut down in an orderly manner when an outage has occurred, and the batteries are running out.

Surge Suppression and Voltage Regulation
A surge protector filters out surges and spikes, and a voltage regulator maintains uniform voltage during a brownout, but a UPS keeps a computer running when there is no electrical power. UPS systems typically provide surge suppression and may provide voltage regulation. See surge suppression.

Standby and Line Interactive
A standby UPS, also called an "offline UPS," is the most common type of UPS found in a computer or office supply store. It draws current from the AC outlet and switches to battery within a few milliseconds after detecting a power failure.

The line interactive UPS "interacts" with the AC power line to smooth out the waveforms and correct the rise and fall of the voltage.

Online UPS
The online UPS is the most advanced and most costly UPS. The inverter is continuously providing clean power from the battery, and the computer equipment is never receiving power directly from the AC outlet. However, online units contain cooling fans, which do make noise and may require some location planning for the home user or small office.


Three UPS Types
All UPS systems switch to battery when the power fails. The difference is how they handle the power under normal circumstances. Standby units provide limited attenuation whereas line interactive systems will adjust the voltage and smooth out bad harmonics. Online systems are constantly regenerating clean power. (Diagrams courtesy of MGE UPS SYSTEMS.)


Three UPS Types
All UPS systems switch to battery when the power fails. The difference is how they handle the power under normal circumstances. Standby units provide limited attenuation whereas line interactive systems will adjust the voltage and smooth out bad harmonics. Online systems are constantly regenerating clean power. (Diagrams courtesy of MGE UPS SYSTEMS.)







Size Does Matter
When the power goes off, the unit on the right will keep more equipment running for a longer time than the one on the left, because the battery is larger. Battery size is an important criterion when selecting UPS systems.








Backing Up the Backup
In APC's Symmetra Power Array, all modules share in the total load; thus, any unit can fail and be replaced without jeopardizing the security the UPS was intended to provide in the first place. (Image courtesy of American Power Conversion Corporation.)
References in classic literature ?
We never said a word, but went straight up onto the hurricane-deck and plumb back aft, and set down on the end of the sky-light.
We would do up the paper again, just as it was, and slip in, very elaborate and soft, and lay it on the bunk again, and let on WE didn't know about any trick, and hadn't any idea he was a-laughing at us behind them bogus snores of his'n; and we would stick by him, and the first night we was ashore we would get him drunk and search him, and get the di'monds; and DO for him, too, if it warn't too risky.
He put up that scheme on us and reasoned out what we would do, and we went ahead and done it perfectly exact, like a couple of pudd'nheads.
I suppose I must make up my mind to marry, one of these days.
And she always has the use of this room for visitors,' said the person of the house, screwing up one of her little bony fists, like an opera-glass, and looking through it, with her eyes and her chin in that quaint accordance.
Our wild guffaws of laughter penetrated even Great-aunt Eliza's deafness, and she glanced up with a startled face.
Then he looked up and the old lady said 'Amen,' loudly and cheerfully.
You are to get up, Tink," Nibs called, "and take Wendy on a journey.
Tink," he rapped out, "if you don't get up and dress at once I will open the curtains, and then we shall all see you in your negligee [nightgown].
He took me up the open space, between the caves and the river, and into the forest beyond, where, in a grassy place among the trees, we made a meal of stringy-rooted carrots.
High up the bluff we climbed, higher than all the other caves, to a tiny crevice that could not be seen from the ground.
Returning to his hotel, he changed cabs as before, went up to his room, and with one more cocktail for a nightcap, went to bed and to sleep.