RE: [EXT] Re: [WIRELESS-LAN] PoE Load Tester Recommendation
For a quick check I use the Fluke Networks LinkSprinter 200 Ethernet Network Tester, (Not what you originally asked, but I like to hear myself talk) I installed wireless here in the 90’s and it has only metastasized everywhere since. (I keep a 10 meg ½ duplex behind my desk to scare the newbies) One thing that tripped us up from time to time is upgrading the switches and AP’s but the wire and jacks are only cat 5e and not rated for the voltages and speeds of today’s AP’s. Maybe a dozen times a year I find burnt jacks or cables that have aged out over the decades and now I insist all upgrades come hand in hand with cable upgrades. (to say nothing of squirrels chewing cables in attics) Now I always go for the most advanced standard in any rebuild install. Chris Swenson Curry College Network manager From: The EDUCAUSE Wireless Issues Community Group Listserv On Behalf Of Ethan Grinnell Sent: Thursday, September 9, 2021 3:39 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: [EXT] Re: [WIRELESS-LAN] PoE Load Tester Recommendation [EXTERNAL EMAIL] CAUTION: This message originated outside of Curry College. Use caution when opening attachments, clicking links or responding to requests for information. I wouldn't suggest hacking together anything to test PoE. It's way more complicated than it seems like it would be. If your test device said that a link failed would you really know if it was an issue with PoE/Cabling or your device? If you're looking for a cheap method, here's a PoE PD client evaluation PCB from Analog Devices https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/DC2911A.html. At only $95 I doubt you'd find a cheaper solution that lets you adjust the requested power. It's not automated and it's not even in an enclosure, but it'd give you all you need to know that PoE is working. I've haven't used one before, so I can't say for sure if it'd work out of the box, but it looks like it should be good. This Fluke seems good if you want an actual tester. It tests up to 90W 802.3af/at/bt and has a 10G interface. I have no experience with it either, but Fluke always seems to make good products. https://www.fluke.com/en-us/product/network-cable-testers/copper/linkiq-100 Ethan Grinnell CCIE Enterprise Infrastructure #39723, BS CmpE Network Engineer Office of Information Technology, Technology Infrastructure, Networking Portland State University On Wed, Sep 8, 2021 at 1:03 PM Neumann, Paul mailto:pa...@uic.edu>> wrote: 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: pa...@uic.edu<mailto:pa...@uic.edu> P: (312) 355-0113 Room 124, Benjamin Goldberg Research Center, University of Illinois at Chicago it.uic.edu<http://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:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>] On Behalf Of Beyerle, David Evan Sent: Wednesday, September 08, 2021 6:44 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> 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 mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> on behalf of Floyd, Brad mailto:bfl...@mail.smu.edu>> Sent: Tuesday, September 7, 2021 5:43 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> mailto:WIRELESS-LAN@LISTS
Re: [WIRELESS-LAN] PoE Load Tester Recommendation
I wouldn't suggest hacking together anything to test PoE. It's way more complicated than it seems like it would be. If your test device said that a link failed would you really know if it was an issue with PoE/Cabling or your device? If you're looking for a cheap method, here's a PoE PD client evaluation PCB from Analog Devices https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/DC2911A.html. At only $95 I doubt you'd find a cheaper solution that lets you adjust the requested power. It's not automated and it's not even in an enclosure, but it'd give you all you need to know that PoE is working. I've haven't used one before, so I can't say for sure if it'd work out of the box, but it looks like it should be good. This Fluke seems good if you want an actual tester. It tests up to 90W 802.3af/at/bt and has a 10G interface. I have no experience with it either, but Fluke always seems to make good products. https://www.fluke.com/en-us/product/network-cable-testers/copper/linkiq-100 Ethan Grinnell CCIE Enterprise Infrastructure #39723, BS CmpE Network Engineer Office of Information Technology, Technology Infrastructure, Networking Portland State University On Wed, Sep 8, 2021 at 1:03 PM Neumann, Paul wrote: > 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: pa...@uic.edu > > 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 to find IT Services, Answers, > and Support! > > > > *From:* The EDUCAUSE Wireless Issues Community Group Listserv [mailto: > WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] *On Behalf Of *Beyerle, David Evan > *Sent:* Wednesday, September 08, 2021 6:44 AM > *To:* WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU > *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 < > WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> on behalf of Floyd, Brad < > bfl...@mail.smu.edu> > *Sent:* Tuesday, September 7, 2021 5:43 PM > *To:* WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU < > WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> > *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=04%7C01%7
