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? Thanks, Chris -- Christopher L. Wade Unistar-Sparco Computers, Inc. Senior Systems Administrator dba Sparco.com Email: clwade@sparco.com 7089 Ryburn Drive Phone: (901) 872 2272 / (800) 840 8400 Millington, TN 38053 Fax: (901) 872 8482 USA
Christopher http://www.voip-info.org/tiki-print.php?page=Cisco+POE Its ALWAYS on the wiki :) Good question, but the 7940 is NOT a proper 802.3af (POE) device. It is a polarity problem, which can be fixed with a crimp tool. With 1 minute of crimping I have seen them work with the DLINK injectors. Cheers Cian -----Original Message----- From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Christopher L. Wade Sent: Thursday, November 11, 2004 11:07 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: [Asterisk-Users] cisco poe 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? Thanks, Chris -- Christopher L. Wade Unistar-Sparco Computers, Inc. Senior Systems Administrator dba Sparco.com Email: clwade@sparco.com 7089 Ryburn Drive Phone: (901) 872 2272 / (800) 840 8400 Millington, TN 38053 Fax: (901) 872 8482 USA _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
> 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.
By far the best poe (price/performance) I have seen for Cisco poe (or standard poe) is the Netgear FSM7326P. http://www.cdw.com/shop/products/default.aspx?EDC=568864 It is a managed layer3 poe switch (24 port) with 2 gigabit ports also. Works out of the box with Cisco and Snoms (it auto detects which polarity they want). No adapters needed for either. And it is about $1100. We are using 4 of them and love them. Jeb Campbell jebc@c4solutions.net Christopher L. Wade wrote:> 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? > > Thanks, > Chris >
Hi do you know how to make a cable for powering a POE Cisco Phone from an not cisco POE Switch ?
A schema for the RJ45 cable pinouts to power a Cisco phones from a non-Cisco switch can be found on the WIKI here http://www.voip-info.org/wiki/index.php?page=Cisco+POE Another option is to use the PowerSense BL-8858-01 PoE Converter, which converts IEEE 802.3AF to Cisco CDP, and will run you about $20 per module. Cory J Andrews ++++++++++++ VOIPSupply.com 454 Sonwil Drive Buffalo, NY 14225 ++++++++++++++ voice - 716.630.1555 X22 email - Cory@VOIPSupply.com AIM - B2CORY ----- Original Message ----- From: "nik600" <nik600@gmail.com> To: "Asterisk Users Mailing List - Non-Commercial Discussion" <asterisk-users@lists.digium.com> Sent: Wednesday, June 07, 2006 4:37 AM Subject: [Asterisk-Users] CISCO POE> Hi > > do you know how to make a cable for powering a POE Cisco Phone from an > not cisco POE Switch ? > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > Asterisk-Users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
The POE switch needs to support "always on". Most switches check the device for 802.3af support before turning on power. The phones only support the CDP power activation, not 802.3af. I've used "always on" POE injectors from wireless access points successfully with Cisco phones. -----Original Message----- From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com]On Behalf Of nik600 Sent: Wednesday, June 07, 2006 7:35 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [Asterisk-Users] CISCO POE many thanks for your reply i've tried to make a cable with that configuration but it seems that it doesn't work... i'm using a 7905G Cisco ip phone and an ALL0484 Switch POE thanks _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- Asterisk-Users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users