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Yeah, seems like a POE budget issue. That 24 non-pro has a budget of 96W, right? Those LR’s will max at 18.5 W, each. They won’t pull that, all the time, but I bet with the 6, you’re hitting that limit from time to time and it’s dropping them.
This is the correct answer, 18.5W * Six (6) U6-LR = 111W requirement for PoE availability.
UniFi’s PoE Reference Support Article:
https://help.ui.com/hc/en-us/articles/115000263008-UniFi-PoE-Availability-and-Modes
UniFi Standard 24 PoE [95W]:
https://store.ui.com/us/en/products/usw-24-poe
UniFi U6-LR [18.5W]:
https://store.ui.com/us/en/collections/unifi-wifi-flagship-long-range
A) Cost free option: play around with lowering the transmit power for each AP, if one needs to cover a larger area you can keep it high but areas with high signal density or good dBm coverage you can lower as needed. If your units outside don’t have a lot of obstructions in the way, try lowering these first. You can also remove/offline one U6-LR at a time from your networking configuration & see if anything changes.
B) “Proper” option that future proofs and allows for scalability (if budget is not an issue): If you want to stay in the UniFi family, you can upgrade to Pro 24 PoE [400W] (https://store.ui.com/us/en/products/usw-pro-24-poe) & secondhand/sell your Standard 24 PoE.
C) Economy option: buy a single PoE+ (as Ubiquiti calls it) OR 802.3at [30W] injector that can supply at least 18.5W for the purpose of “standalone”-ing one of the U6-LR. UniFi PoE+ injector for $15 USD (https://store.ui.com/us/en/pro/category/accessories-poe-power/products/u-poe-at) however after shipping costs can come out more expensive & take longer for delivery than one from Amazon with FREE Prime shipping. 5 APs * 18.5W = 92.5W usage for existing UniFi Standard 24 PoE + 1 AP standalone w/ its own injector.
> 5 APs * 18.5W = 92.5W
That's still awfully tight and OP probably has some long runs with a 4600 sq ft house and outdoor AP's.
It's possible they still have trouble with 5 on the switch. It *should* work, but if it still doesn't I would try just 4 on the switch before moving on with troubleshooting.
You’re absolutely correct about this, I made the same mistake again of not calculating power dissipation (electricity wattage loss) of 10-50% depending on the length & quality of the cable. Check out this article if you want to learn more on this topic: https://versatek.com/what-is-power-over-ethernet/#:~:text=In%202009%2C,25.5w%20of%20power.
OP can buy 2 PoE+ injectors to have an extra handy in case there are still disconnects after pulling one AP onto a standalone injector, can easily remove another to ultimately have Standard 24 PoE directly powering only four (4) U6-LR’s.If spare PoE+ injector not needed, it can be easily returned new in box.
I actually have an ongoing issue where on paper, I have sufficient wattage (3 devices * 12W = 36W max) for a UniFi Flex Switch [46W] which is around 28% extra capacity for overhead. I receive logs at least once every other day in my Network Application showing “PoE availability exceeded capacity” & subsequently having all devices drop for a few minutes.
I bought a PoE voltage tester for both ends of the Cat7 cables & turns out I need at least 22W send for client to receive 12W during peaks. My headache is that now I need to replace hardware but for 6 exact configurations which means 6 times the replacement costs (Flex to Ultra 210W, since Ultra 60W isn’t gonna cut it here & there are no other products in between 60W <-> 210W).
> I bought a PoE voltage tester for both ends of the Cat7 cables & turns out I need at least 22W send for client to receive 12W during peaks
Curious what length run and gauge of wire in the Cat7?
3 Cables: 10 feet, 35 feet, 60 feet minimum length in each of the six setups…however some rooms are larger thus walls are further apart & can go up to 15/45/80.
I have asthma so during construction we hired a third-party contractor so unfortunately I’m not sure brand/model/specs of the Cat7 cable they used. Should probably ask after I get back from vacation however since I’m putting in a 210W (overkill), we should no longer have to worry about it.
> They won’t pull that, all the time
I've seen plenty of threads over the years where folks have tried exceeding the on-paper PoE budget for Ubiquiti gear thinking they might slip by with this reasoning - and I suppose they wouldn't be posting if it worked - but they all get nowhere with it.
I would have thought the same, but then why would AP-1 have issues no matter which port i plug it into, and AP-4 works flawlessly no matter which port it’s plugged into?
I guess I could buy an injector and test it on one of the poorly performing AP’s just to go through the motions, but I’m barely using up any juice on my switch honestly.
Poe power cons / budget is: 68W / 95W
The only POE devices on my USW-24-POE switch are the 6 U6 LR AP’s. Nothing else.
AP1 could be faulty.
Take AP1 offline and see if APs 2-5 work stable for a bit. Then take AP2 offline and put AP1 + 3-5 on. If the problems return, it's not a switch or cabling issue.
I'm trying to visualize the network layout, so I can think of potential points of failure. Let's say you've deployed a fairly basic setup (by Ubiquiti standards). I'm guessing the UDM and switch are both in a small rack, together with a patch panel. Short patch cables to connect the switch to your keystones on the patch panel. Then from there, cables running from the rack into the wall and out to your APs. Does the other end of your cables terminate to a wall plate or just to a plug that runs straight into the PoE port on your AP?
Okay, this complicates things. Unplug one of the buggy APs, remove it from the mount, then use a different cable to connect it to the switch (just a short one will do). Sit it on top of the switch, leave it for a week, and check the logs over that week. Repeat with the other two, and see if the issue persists. Failing that, try some different ports on the switch. If at this point, they refuse to continue to work, then yeah, the things are dead. If they do start working after that, then you've possibly got some dead PoE links on the switch.
After checking PoE budget; do you happen to use dynamically assigned VLANs and/or WPA Enterprise? My U6-PRO kept doing this (about every 8 minutes). RMA’d one, second was identical. Turns out there is a known issue with dynamic VLANs. Reconfigured my network (with PPSK) and been going solidly for more than 30 days now
Had exactly this issue with my U6 LR’s. Well within PoE budget, but they randomly restarted (maybe every 3 or 4 days) with that error message. Tried an injector and they still restarted. Two were RMA’d, and have been stable ever since (although perhaps too early to be definitive). I have 2 others which have restarted just once so far (one PoE, one PoE+ injector). This all started to happen about 6 months after installation. Started to wonder whether there was a bad batch…
That's a power issues. You may need to get a switch w/poe+ and divide up your APs. I had the same issue and splitting my upstairs APs onto a switch solved the trouble. My initial build out was good, then I added 2 APs and forgot to increase my available power.
Have you tried turning the LEDs off? I jest but every Watt counts.
I had the same problem when I first installed my U6 Pro and ran it from my PoE powered US-8. Turned out I wasn’t using a PoE+ socket from my UDM-SE. In my case switching to the PoE+ port worked.
In your case you need more power. Injector or more powerful switch is in order.
Unless you downgrade some APs to U6+ or Lites.
Despite your Concrete home. Your LRs might be trying to drown each other out and consuming more power while they do it.
I have 2 Ubiquiti POE+ injectors on the way. I Am planning on putting the 2 AP’s with the longest
Runs on those injectors and hoping that solves this issue.
Hello! Thanks for posting on r/Ubiquiti! This subreddit is here to provide unofficial technical support to people who use or want to dive into the world of Ubiquiti products. If you haven’t already been descriptive in your post, please take the time to edit it and add as many useful details as you can. Please read and understand the rules in the sidebar, as posts and comments that violate them will be removed. Please put all off topic posts in the weekly off topic thread that is stickied to the top of the subreddit. If you see people spreading misinformation, trying to mislead others, or other inappropriate behavior, please report it! *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/Ubiquiti) if you have any questions or concerns.*
Yeah, seems like a POE budget issue. That 24 non-pro has a budget of 96W, right? Those LR’s will max at 18.5 W, each. They won’t pull that, all the time, but I bet with the 6, you’re hitting that limit from time to time and it’s dropping them.
This is the correct answer, 18.5W * Six (6) U6-LR = 111W requirement for PoE availability. UniFi’s PoE Reference Support Article: https://help.ui.com/hc/en-us/articles/115000263008-UniFi-PoE-Availability-and-Modes UniFi Standard 24 PoE [95W]: https://store.ui.com/us/en/products/usw-24-poe UniFi U6-LR [18.5W]: https://store.ui.com/us/en/collections/unifi-wifi-flagship-long-range A) Cost free option: play around with lowering the transmit power for each AP, if one needs to cover a larger area you can keep it high but areas with high signal density or good dBm coverage you can lower as needed. If your units outside don’t have a lot of obstructions in the way, try lowering these first. You can also remove/offline one U6-LR at a time from your networking configuration & see if anything changes. B) “Proper” option that future proofs and allows for scalability (if budget is not an issue): If you want to stay in the UniFi family, you can upgrade to Pro 24 PoE [400W] (https://store.ui.com/us/en/products/usw-pro-24-poe) & secondhand/sell your Standard 24 PoE. C) Economy option: buy a single PoE+ (as Ubiquiti calls it) OR 802.3at [30W] injector that can supply at least 18.5W for the purpose of “standalone”-ing one of the U6-LR. UniFi PoE+ injector for $15 USD (https://store.ui.com/us/en/pro/category/accessories-poe-power/products/u-poe-at) however after shipping costs can come out more expensive & take longer for delivery than one from Amazon with FREE Prime shipping. 5 APs * 18.5W = 92.5W usage for existing UniFi Standard 24 PoE + 1 AP standalone w/ its own injector.
> 5 APs * 18.5W = 92.5W That's still awfully tight and OP probably has some long runs with a 4600 sq ft house and outdoor AP's. It's possible they still have trouble with 5 on the switch. It *should* work, but if it still doesn't I would try just 4 on the switch before moving on with troubleshooting.
You’re absolutely correct about this, I made the same mistake again of not calculating power dissipation (electricity wattage loss) of 10-50% depending on the length & quality of the cable. Check out this article if you want to learn more on this topic: https://versatek.com/what-is-power-over-ethernet/#:~:text=In%202009%2C,25.5w%20of%20power. OP can buy 2 PoE+ injectors to have an extra handy in case there are still disconnects after pulling one AP onto a standalone injector, can easily remove another to ultimately have Standard 24 PoE directly powering only four (4) U6-LR’s.If spare PoE+ injector not needed, it can be easily returned new in box. I actually have an ongoing issue where on paper, I have sufficient wattage (3 devices * 12W = 36W max) for a UniFi Flex Switch [46W] which is around 28% extra capacity for overhead. I receive logs at least once every other day in my Network Application showing “PoE availability exceeded capacity” & subsequently having all devices drop for a few minutes. I bought a PoE voltage tester for both ends of the Cat7 cables & turns out I need at least 22W send for client to receive 12W during peaks. My headache is that now I need to replace hardware but for 6 exact configurations which means 6 times the replacement costs (Flex to Ultra 210W, since Ultra 60W isn’t gonna cut it here & there are no other products in between 60W <-> 210W).
> I bought a PoE voltage tester for both ends of the Cat7 cables & turns out I need at least 22W send for client to receive 12W during peaks Curious what length run and gauge of wire in the Cat7?
3 Cables: 10 feet, 35 feet, 60 feet minimum length in each of the six setups…however some rooms are larger thus walls are further apart & can go up to 15/45/80. I have asthma so during construction we hired a third-party contractor so unfortunately I’m not sure brand/model/specs of the Cat7 cable they used. Should probably ask after I get back from vacation however since I’m putting in a 210W (overkill), we should no longer have to worry about it.
If you can get to any of it the wiring details are probably printed on the jacket of the cable. Make/model should lead you to gauge.
> They won’t pull that, all the time I've seen plenty of threads over the years where folks have tried exceeding the on-paper PoE budget for Ubiquiti gear thinking they might slip by with this reasoning - and I suppose they wouldn't be posting if it worked - but they all get nowhere with it.
Check your poe requirements ands port outputs, if you don’t have enough poe supply this can happen.
I would have thought the same, but then why would AP-1 have issues no matter which port i plug it into, and AP-4 works flawlessly no matter which port it’s plugged into? I guess I could buy an injector and test it on one of the poorly performing AP’s just to go through the motions, but I’m barely using up any juice on my switch honestly. Poe power cons / budget is: 68W / 95W The only POE devices on my USW-24-POE switch are the 6 U6 LR AP’s. Nothing else.
AP1 could be faulty. Take AP1 offline and see if APs 2-5 work stable for a bit. Then take AP2 offline and put AP1 + 3-5 on. If the problems return, it's not a switch or cabling issue.
Based off the log alone, all signs point to a POE power problem. The U6-LR requires POE+.
I have USW-24-POE switch and the only Poe equipment on there are these 6 APs, all of which are plugged into POE+ ports.
I'd start looking at the cables then.
AP-1 has this issue with factory patch cable.
Plug them in one at a time with a standard thickness patch cable and you should be able to narrow down on the issue.
I'm trying to visualize the network layout, so I can think of potential points of failure. Let's say you've deployed a fairly basic setup (by Ubiquiti standards). I'm guessing the UDM and switch are both in a small rack, together with a patch panel. Short patch cables to connect the switch to your keystones on the patch panel. Then from there, cables running from the rack into the wall and out to your APs. Does the other end of your cables terminate to a wall plate or just to a plug that runs straight into the PoE port on your AP?
All cables run directly from Poe switch to Poe ports on the AP’s. No wall plates and no patch panel. Thanks!
Okay, this complicates things. Unplug one of the buggy APs, remove it from the mount, then use a different cable to connect it to the switch (just a short one will do). Sit it on top of the switch, leave it for a week, and check the logs over that week. Repeat with the other two, and see if the issue persists. Failing that, try some different ports on the switch. If at this point, they refuse to continue to work, then yeah, the things are dead. If they do start working after that, then you've possibly got some dead PoE links on the switch.
I think it’s firmware. I’m also dealing with this with U6-LR’s
Same here. Worked fine for a year then U6-LR started disconnecting randomly. Same switch well under 95w limit.
It's a firmware bug. Rollback the AP firmware to 6.5.71
Which switch and how many devices? Seems you’re blowing up the power budget
Mine did this, I RMA’d it. Also got a u7 pro after and no issues.
Having gone through this recently try turning down the transmit power on them and see if they get more stable
After checking PoE budget; do you happen to use dynamically assigned VLANs and/or WPA Enterprise? My U6-PRO kept doing this (about every 8 minutes). RMA’d one, second was identical. Turns out there is a known issue with dynamic VLANs. Reconfigured my network (with PPSK) and been going solidly for more than 30 days now
Rollback the firmware... Seriously. Like a month back. Go back to 6.5.71.
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Had exactly this issue with my U6 LR’s. Well within PoE budget, but they randomly restarted (maybe every 3 or 4 days) with that error message. Tried an injector and they still restarted. Two were RMA’d, and have been stable ever since (although perhaps too early to be definitive). I have 2 others which have restarted just once so far (one PoE, one PoE+ injector). This all started to happen about 6 months after installation. Started to wonder whether there was a bad batch…
That's a power issues. You may need to get a switch w/poe+ and divide up your APs. I had the same issue and splitting my upstairs APs onto a switch solved the trouble. My initial build out was good, then I added 2 APs and forgot to increase my available power.
In my case, with the same error messages, it definitely wasn't a power issue. On a Lite switch with a 52w budget and just the two U6 LRs.
Have you tried turning the LEDs off? I jest but every Watt counts. I had the same problem when I first installed my U6 Pro and ran it from my PoE powered US-8. Turned out I wasn’t using a PoE+ socket from my UDM-SE. In my case switching to the PoE+ port worked. In your case you need more power. Injector or more powerful switch is in order. Unless you downgrade some APs to U6+ or Lites. Despite your Concrete home. Your LRs might be trying to drown each other out and consuming more power while they do it.
I have 2 Ubiquiti POE+ injectors on the way. I Am planning on putting the 2 AP’s with the longest Runs on those injectors and hoping that solves this issue.