> I know this is on the wiki, I just want to confirm so I don't blow up my > cisco phones. I've got several cisco 7940's all running using cisco > power cubes. However, my boss wants me to switch just a few over to > poe, but doesn't want to fork out the dough for a nice cisco poe switch, > or anybody else's poe switch for that matter. > > So my question is, what is the '99.999% sure/safe' poe injector solution > that most people are using for the cisco phones? > > Right now I'm looking at buying the 3-Com 3CNJPSE (qty 2-3) to power the > few specific locations where a power cube just wouldn't look right, like > a conference room table for example. :) I know this solution, thanks to > the fact that it is a 'hack', is far from the 99.999% I just stated, but > it also seems to be the only low-end solution for poe. Am I right, or > just plain blind?
The thing you need to watch out for is that the 7940/7960 do not do PoE, or (more specifically) do not do standard PoE. They use the Cisco variant, a pre-standard PoE which has reversed polarity. This means that, unless a switch actually claims to be compatible with the Cisco variant, a non-Cisco PoE switch will not power the 7940/7960. Likewise, injectors probably won't work, though some people report success with various hacks such as wiring up a cable to provide a Cisco-compatible layout. Beware that there are severe risks in doing this, in that if you inadvertently plug in some other PoE device to such a port, or don't clearly mark such cables, that you are likely to burn up some other PoE device at a future point in time. Bad Cisco, very bad Cisco... ... JG -- Joe Greco - sol.net Network Services - Milwaukee, WI - http://www.sol.net "We call it the 'one bite at the apple' rule. Give me one chance [and] then I won't contact you again." - Direct Marketing Ass'n position on e-mail spam(CNN) With 24 million small businesses in the US alone, that's way too many apples. _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
