I suspect some (non-trivial) time and tinkering would be needed to make this work. I see a major issue is that all the flavors (classes) of POE require the devices to first complete a power negotiation phase where the endpoint requests the proper class of power needed. Only then is power delivered to your resistance (properly sized for wattage with an appropriate heatsink). Also power is delivered over the data lines for certain poe modes - you need to separate the baseline voltage from the data communication that is superimposed over that. All the above should be achievable for anyone with a EE background. I'm sure there is some level of devil in the details.
This would be a cool senior project for an upper level/grad student in electrical engineering but for serious work, I would just buy a fluke tester. Paul -- Paul Neumann Lead Network Engineer Technology Solutions (formerly ACCC) Unversity of Illinois Chicago E: [email protected]<mailto:[email protected]> P: (312) 355-0113 Room 124, Benjamin Goldberg Research Center, University of Illinois at Chicago it.uic.edu Visit the UIC Help Center at help.uic.edu<http://help.uic.edu/> to find IT Services, Answers, and Support! From: The EDUCAUSE Wireless Issues Community Group Listserv [mailto:[email protected]] On Behalf Of Beyerle, David Evan Sent: Wednesday, September 08, 2021 6:44 AM To: [email protected] Subject: Re: [WIRELESS-LAN] PoE Load Tester Recommendation Brad, Recall that P=V^2/R, so it seems as though applying the appropriately sized & load-rated resistance network across the pairs delivering power, and then measuring the voltage dropped across that resistance network would give you a reasonably good indication of whether the appropriate power is being delivered to the load. For 60W in seems like you might choose R~75 Ohm on each of two pair, but I'd encourage you to double-check my arithmetic. Best, Dave ________________________________ From: The EDUCAUSE Wireless Issues Community Group Listserv <[email protected]<mailto:[email protected]>> on behalf of Floyd, Brad <[email protected]<mailto:[email protected]>> Sent: Tuesday, September 7, 2021 5:43 PM To: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> Subject: [WIRELESS-LAN] PoE Load Tester Recommendation Can anyone recommend a device to PoE load test network jacks? I have some jacks that pass the installer's Category Certification, but are not passing the appropriate PoE to bring the APs online. I would like to be able to load test for 802.3af, 802.3at, and 802.3bt (at both 60W and 90W), as appropriate. I assume I would need to be able to set the load to apply (in Watts) and see the voltage level at the Powered Device. The usual constraints apply. Cheaper, but reliable is best. Thanks, Brad ********** Replies to EDUCAUSE Community Group emails are sent to the entire community list. If you want to reply only to the person who sent the message, copy and paste their email address and forward the email reply. Additional participation and subscription information can be found at https://www.educause.edu/community<https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.educause.edu%2Fcommunity&data=04%7C01%7Cpauln%40UIC.EDU%7C436ae8b7f55a4643418708d972bf4ff5%7Ce202cd477a564baa99e3e3b71a7c77dd%7C0%7C0%7C637666988276377056%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=Q1PCAmrEbs8dN15kgBMiEcSrE5NBGypIWzi0pE%2FJUPc%3D&reserved=0> ********** Replies to EDUCAUSE Community Group emails are sent to the entire community list. If you want to reply only to the person who sent the message, copy and paste their email address and forward the email reply. Additional participation and subscription information can be found at https://www.educause.edu/community<https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.educause.edu%2Fcommunity&data=04%7C01%7Cpauln%40UIC.EDU%7C436ae8b7f55a4643418708d972bf4ff5%7Ce202cd477a564baa99e3e3b71a7c77dd%7C0%7C0%7C637666988276387053%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=%2FIRunUgBt%2F2jSXJPgU%2Bh19lAXgUdqrdya4FVEa9v%2F1k%3D&reserved=0> ********** Replies to EDUCAUSE Community Group emails are sent to the entire community list. If you want to reply only to the person who sent the message, copy and paste their email address and forward the email reply. Additional participation and subscription information can be found at https://www.educause.edu/community
