Vendor X says that (fill in description) is a UPS, but it's different that what you describe above. E-mail
There really is no standard definition of what a UPS is. Anything ranging from a 9 volt battery backup in a clock radio to a building/compound wide backup generator has been called a UPS by someone. The majority of this document refers to objects larger than a beer can and smaller than a desk that help devices remain temporarily operational when changes to the power they receive would otherwise interrupt their function. 

Maintaining power to a minicomputer (like a VAX 11) is beyond the scope of this document. This FAQ deals with UPS equipment that can be installed by a computer owner/administrator. If you have requirements that large, you need to talk to a qualified electrician.
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