Quoting Kristian Kielhofner <[EMAIL PROTECTED]>: > On Dec 6, 2007 10:44 AM, Jon Pounder <[EMAIL PROTECTED]> wrote: >> Quoting Salvatore Giudice <[EMAIL PROTECTED]>: >> >> > The electricity is carried on different pins in a cisco poe injector. Just >> > because they both support the same standard doesn't mean they were >> > implemented the same. >> > >> >> I didn't even know the gxp2000's could handle poe - anyone care to >> share what voltage/current they expect on what pins ? >> >> even if I could just move the existing powersupplies back to the >> punchdown panel that would unclutter desks and make centralizing ups >> power that much simpler. >> > > Not a good idea. > > The Grandstreams expect 48V just like every other POE device. Their > power supplies are 12V. Simply splicing them inline with an ethernet > cable won't work. To boot, some older Grandstreams use 5V power > supplies. That obviously won't work either. 48V is nice because it > is high enough voltage to not suffer distribution loss over cable runs > but low enough to not cause major harm and still qualify as "low > voltage" under many codes, laws, etc. > > The biggest problem is that any properly implemented PoE device > negotiates PoE. The other pairs of ethernet are not just live, > supplying 48V DC to anything. That's why I refuse to use "passive" > PoE. Just seems dangerous!
I guess I just live dangerous, I normally wire all rj45s to be phone on blue and ethernet on org/green. And guess what's on phone ? the same 48Vdc and even more if it happens to ring. Then if I plug in ethernet it works, or plug in phone it works, and I don't have to be too concerned about which jack is which. > > > -- > Kristian Kielhofner > > _______________________________________________ > --Bandwidth and Colocation Provided by http://www.api-digital.com-- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > Jon Pounder _/_/_/ _/ _/ _/ _/_/_/ _/ _/ _/_/_/_/ _/ _/_/ _/ _/ _/ _/_/ _/ _/_/ _/ _/ _/_/ _/ _/ _/ _/_/ _/ _/_/_/ _/ _/ _/_/_/_/ _/_/_/ _/ _/ _/_/_/_/ Inline Internet Systems Inc. Thorold, Ontario, Canada Tools to Power Your e-Business Solutions www.inline.net www.ihtml.com www.ihtmlmerchant.com www.opayc.com ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program. _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
