Kitz Forum
Broadband Related => FTTC and FTTP Issues => Topic started by: Weaver on January 20, 2023, 08:25:24 AM
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What do you do to protect your ONT from lightning damage via the mains?
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A UPS and a backup 4G and/or FTTC connection.
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What do you do to protect your ONT from lightning damage via the mains?
I use the wall-wart UPS you recommended. The ONT only uses 2.5W max so should last ages on that. Of course wont do me much good given the router and switch only have 10-15 minutes. ::)
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Well - does an ONT really need UPS coverage? It's not like a FTTC where maintaining a constant connection is desirable.
Can't wait to be rid of FTTC but, not a lot of choice.
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It's one of the devices protected here - https://forum.kitz.co.uk/index.php/topic,27467.msg462436.html#msg462436
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Well - does an ONT really need UPS coverage?
You may want to maintain your network during a planned/unplanned power outage, eg check your DNO's website for faults during a power outage? I have had to do that twice recently, as my 4G reception is not brilliant indoors.
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Well - does an ONT really need UPS coverage? It's not like a FTTC where maintaining a constant connection is desirable.
Can't wait to be rid of FTTC but, not a lot of choice.
If you want VoIP to work during a prelonged power cut where the cell towers run out of juice, then yeah. ;) Its unlikely to happen, but worth considering for some. Or if someone is working using cloud applications using their laptop, could be useful to have a few minutes to tidy up what you were doing.
Its rather too complicated for me given my setup, as the router only gets 15 minutes power anyway (I don't have the physical space for a higher capacity UPS). I should probably find an old router and configure it for Zen as a backup anyway though.
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Course, VoIP.
I'd just use my mobile so wouldn't worry about keeping my VoIP running - same problem with DECT though - base needs power to operate and I haven't owned a corded telephone since... who even knows... :) Not that would be of any use as I've no landline to make calls off anymore :)
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I use the wall-wart UPS you recommended. The ONT only uses 2.5W max so should last ages on that. Of course wont do me much good given the router and switch only have 10-15 minutes. ::)
As I'm all about the detail and just FYI, Weaver, my 4 port Huawei HG8240H draws 3.6 watts at peak hunger and my YouFibre Adtran 622v 6.6 watts. The Adtran is almost certainly using a smaller fabrication process for the chips however the XGSPON laser is a little more power hungry than a GPON one and 10GBase-T is notorious for power consumption relative to alternatives.
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An 'online' UPS, but some other devices are also connected to the UPS. It should last around an hour or so assuming all of the currently connected devices remain connected. After that there's my petrol generator which is handy in the event of an extended power outage.
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As I'm all about the detail and just FYI, Weaver, my 4 port Huawei HG8240H draws 3.6 watts at peak hunger and my YouFibre Adtran 622v 6.6 watts. The Adtran is almost certainly using a smaller fabrication process for the chips however the XGSPON laser is a little more power hungry than a GPON one and 10GBase-T is notorious for power consumption relative to alternatives.
Its my understanding 10GBase-T will pull at least 2W raising up to 5W depending on cable length with Gigabit more like half a watt.
I can't find the numbers for 2.5G and 5G but its clearly much lower given both can run off a 5v 900mA USB adapter, though I wonder if that impacts the max cable length?
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The 10GBase-T SFP+ connected to the ONT is... toasty.
It actually triggers the router's fans. Look at the delta between CPU temperature and that module :'(
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Yeah I notice my Aquantia AQC107 NIC gets pretty toasty, some people were claiming it was crashing due to heat though I found it only had issues on Windows and updating the firmware (touch wood) so far seems to have solved it.
Although idle:
enp6s0-pci-0600
Adapter: PCI adapter
PHY Temperature: +82.9°C
MAC Temperature: +79.8°C
Under load:
enp6s0-pci-0600
Adapter: PCI adapter
PHY Temperature: +84.3°C
MAC Temperature: +81.0°C
ASUS really should have used TiM on these, instead they have a stupid thermal pad which clearly is struggling.
Oh interesting, forcing EEE on with ethtool:
IDLE:
enp6s0-pci-0600
Adapter: PCI adapter
PHY Temperature: +77.3°C
MAC Temperature: +74.7°C
LOAD:
enp6s0-pci-0600
Adapter: PCI adapter
PHY Temperature: +80.8°C
MAC Temperature: +77.4°C
Rather annoying that Aquantia do not mention the maximum chip temperature, only operating temperature of 55C which clearly must mean inside the case as they mention passive. It also seems rather unrealistic given the above in an actively cooled case, but I guess they weren't counting on ASUS making a card with a crap interface and heatsink.
To be fair I've not had any performance problems with it (unlike the same card in my Windows 11 box) and I would have gone Intel but I only have a 4x PCIe 4.0 lanes.
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I use an Eaton 3S Mini for my ONT power; I used the same unit for my G.fast modem before it.
I also have a PoE splitter that I can use from my main rack UPS... should outages become more protracted.
https://www.amazon.co.uk/Eaton-3S-Mini-black-white/dp/B092TG9M7C
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The 10GBase-T SFP+ connected to the ONT is... toasty.
It actually triggers the router's fans. Look at the delta between CPU temperature and that module :'(
I have some small fans blowing over my S+RJ10's in the switch, each with a rather small heatsink on the top side of them. My most active one seems to be around 64C to 65C at the moment, room temperature is currently 24.5 C.
(https://i.imgur.com/2qG12rF.png)
Every little helps I guess :D, but yeah they do get a little warm. Even the onboard LANs on both of my Threadripper systems do, quite a bit hotter than 65C if I don't have any cooling fans running in the case.
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The AQC107 seems particularly bad, there are reports of even the ones on motherboards dropping out from overheating. I think their data sheet was wildly optimistic about cooling, although the manufacturers must have done some really poor testing also.
It would be interesting to test an ONT with a NBASE-T port that supports 10Gbit and see what the power draw difference is between 1,2.5,5 and 10. As the ONT itself should draw very little, it should be easier to guesstimate what the NIC is consuming.
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I have some small fans blowing over my S+RJ10's in the switch, each with a rather small heatsink on the top side of them. My most active one seems to be around 64C to 65C at the moment, room temperature is currently 24.5 C.
Not a bad idea, I've some USB fans that'll hit the spot, however it's a case of where I can get the air onto the module. It's in SFP 3 of one of these:
https://i.mt.lv/cdn/rb_images/2118_hi_res.png
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Ixel you are a legend. Have a USB fan precariously aimed at the module from underneath and it's brought temperature down to the point where the router's switched its fans off.
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I think most of these posts are missing the point of the original question, which wasn't related to retaining service during a power cut, but preventing damage to the ONT from a surge owing to lightning strike. I think to be honest you're going to have bigger issues than your ONT if you receive an equipment damaging lighting strike to the house - the ONT doesn't have a conductive path to the phone network, so it's no more or less likely to be damaged than any other device in the home connected to the mains; plus it's one of the few devices that aren't even your responsibility to replace if it is damaged (that falls to Openreach). If you were really worried about it and planning for the absolute worst; I suppose what you'd want is a fibre-ethernet converter on the ethernet port of the ONT, with the ONT and the fibre ethernet device being battery powered during storms...
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Ixel you are a legend. Have a USB fan precariously aimed at the module from underneath and it's brought temperature down to the point where the router's switched its fans off.
Nice and you're welcome! :thumbs:
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I think most of these posts are missing the point of the original question, which wasn't related to retaining service during a power cut, but preventing damage to the ONT from a surge owing to lightning strike.
Not at all, I mentioned the UPS as unless I am mis-remembering something it has surge protection built in, pretty standard for most if not all UPS I think. I can't remember if its lightening grade or not, but then if its a direct enough strike on the mains its unlikely anything will protect it.
Of course the beauty of an ONT is you don't have any metal coming into the property, there are support wires in the drop cable for rigidity but that ends at box outside.
When our chimney got hit it was the phone line it did the most damage from, although there was enough residual to leave smoke in the utility room where the breakers were and blow up a neon on a switch - but nothing seemed to get damaged from the mains itself.
We did drift off into talk of 10Gbit though, after we all came the same conclusion of using a UPS.
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I’m glad to hear that your ONT is voltage and current-compatible with the mini lion DC UPS’s that I have already. I have two that are not in use any more as my WAPs were powered by them but are now POE. Even though I realise that the likelihood of lightning strike would be ridiculously low with FTTP, this is such an extremely bad place here, so high and exposed. I would want UPS power as well anyway, until we can start our generator. We have another UPS for the router, modems, switches and WAPs, but I’m worried about the runtime, so I ought to do an experiment.
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I’m glad to hear that your ONT is voltage and current-compatible with the mini lion DC UPS’s that I have already. I have two that are not in use any more as my WAPs were powered by them but are now POE. Even though I realise that the likelihood of lightning strike would be ridiculously low with FTTP, this is such an extremely bad place here, so high and exposed. I would want UPS power as well anyway, until we can start our generator. We have another UPS for the router, modems, switches and WAPs, but I’m worried about the runtime, so I ought to do an experiment.
Yeah the only problem was the DC jack, it had to go through two adapters which I don't like (and I can't remember if its ones that particular UPS came with or I scavenged from the adapters I've collected from other 12V UPS devices). But then we now know they are rolling out a different ONT, so maybe that will have a different jack again?