I find this is often the case when searching for "long tail" terms, like specific models of equipment. There are tons and tons of sites like this (http://camera.manualsonline.com/ex/mfg/headline/m/avaya/type...) at the top of the search results.
(Edit: And while we're at it, trying to find information on obscure error messages or documentation for software is at least as frustrating, but for a whole other reason: so many of the results are forum posts from years ago discussing an obsolete version of the software or error conditions that are no longer relevant. For a more specific example, we recently had an OpenSolaris server refuse to boot with the very helpful "Error 16" message; the only thing we could find were references to an out-of-date BIOS problem that no longer applies.)
Google is drifting very, very far from what they set out to do 11 years ago, IMO.