[AusNOG] Lightning and FTTC - is it really this bad?
Matthew Moyle-Croft
mmc at mmc.com.au
Fri Jan 22 09:23:34 EST 2021
The DPUs being back-fed from the houses they provide service I’d suggest is the main reason - ADSL modems just had the ADSL signal to contend with, whereas back feeding power means you’ve got the DPU, with power across the 4 Cu lines into the houses and the power grid in four houses connected to the NTDs all being electrically connected for power (Potentially (Ha!) across 3 phases).
So a lightning strike that hits a power pole nearby is likely to fry a lot of stuff.
Reality is, FTTC is just a way of delaying spending money on fibre. To build FTTC NBN are building a GPON network already, just using Cu into the house. (It’s a very NPV friendly way of deploying, delaying capex is always a winner there).
MMC
> On 21 Jan 2021, at 10:34 am, Jrandombob <jrandombob at darkglade.com> wrote:
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> Yeah, sounds to me like the NTDs just aren't very well designed.
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> Even in a high lightning area, as Damien said previously, if anything FTTC ought to be LESS susceptible (assuming of course the devices are well designed) to lightning owing to the shorter cable runs.
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> On Thu, Jan 21, 2021 at 10:50 AM Paul Julian <paul at fivejay.com.au <mailto:paul at fivejay.com.au>> wrote:
> As somebody who lives in one of the areas that gets affected a lot, and that the article was mostly written about I believe, I can tell you that there are a lot more NTD’s getting damaged than there was ADSL modems.
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> I can’t explain it either, it shouldn’t be happening, however people with surge protected power boards are copping it as well, it’s like it’s coming through the copper, maybe due to the nature of the DPU and other people connected, perhaps it’s transiting the DPU and damaging other NTD’s, I don’t know, but the DPU’s seem to be unaffected, only NTD’s, so it could be a design issue.
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> I don’t use NBN myself, however our local facebook page lights up whenever there is a storm approaching or upon us, with people talking about unplugging NTD’s etc. and then of course afterwards when people complain about no internet, and then the complaints that it’s taken NBN 5 days to get there and replace it 😊
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> Many people have been told by the provider that NBN is looking at NTD’s which handle power spikes better, I don’t know what they are actually doing but that’s what people are being told.
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> The NBN techs will also not leave spare equipment, this makes sense of course, but I know the question has been asked many times in our community.
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> I believe the article came about due to many people complaining to local MP’s about the issues and obviously the media has picked it up as well.
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> Regards
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> Paul
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> From: AusNOG <ausnog-bounces at lists.ausnog.net <mailto:ausnog-bounces at lists.ausnog.net>> On Behalf Of Brendan Ord
> Sent: Thursday, 21 January 2021 10:36 AM
> To: Damien Gardner Jnr <rendrag at rendrag.net <mailto:rendrag at rendrag.net>>
> Cc: ausnog at ausnog.net <mailto:ausnog at ausnog.net> <ausnog at lists.ausnog.net <mailto:ausnog at lists.ausnog.net>>
> Subject: Re: [AusNOG] Lightning and FTTC - is it really this bad?
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>
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> Damien, I agree with you. Lightning is going to be causing the same issues it always caused regardless of the technology; telegram, POTS, ADSL or VDSL from the curb or cabinet – nothing’s changed because there’s still copper conductors in the ground.
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> I smell a lot of agenda pushing and bias in this article and that’s about all it is.
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> Although, maybe a more important topic mentioned in the article – NBN won’t allow these businesses to buy a cold spare?!?
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> Brendan Ord
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> From: AusNOG <ausnog-bounces at lists.ausnog.net <mailto:ausnog-bounces at lists.ausnog.net>> On Behalf Of Damien Gardner Jnr
> Sent: Thursday, 21 January 2021 9:11 AM
> To: Troy Kelly <troy at troykelly.com <mailto:troy at troykelly.com>>
> Cc: ausnog at ausnog.net <mailto:ausnog at ausnog.net> <ausnog at lists.ausnog.net <mailto:ausnog at lists.ausnog.net>>
> Subject: Re: [AusNOG] Lightning and FTTC - is it really this bad?
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> Yeah it really didn’t make sense to me. How is a product which only has a TINY bit of copper compared to FTTN and indeed the older POTS network, SO much more susceptible to lightning strikes? I mean, it’s Fibre to the pit, and then one breakout box is running four(?) homes, with maybe 100-150m total of copper between all four homes’ runs? Unless lightning is hitting one of those houses, or the people in those houses are stupid enough to NOT be running surge protection on their gear (seriously, wtf? Are there really people without surge protection these days? It’s been around for 30 years, and is on almost every power board Bunnings sell..), I don’t see how lightning can be an issue??
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> Something doesn’t make sense here..
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> —DG
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> On Thu, 21 Jan 2021 at 8:25 am, Troy Kelly <troy at troykelly.com <mailto:troy at troykelly.com>> wrote:
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> Yes Mark, I've heard of it ;)
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> I guess my point was - why is (is it?) FTTC somehow apparently more susceptible to discharge issues than POTS was/is. Perhaps I am getting the wrong impression from the article.
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> Regards, Troy
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> Brevity is the elixir of life.
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> Father Hector McGrath, Pixie 2020
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> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
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> On Wednesday, 20 January 2021 10:15 PM, Mark Smith <markzzzsmith at gmail.com <mailto:markzzzsmith at gmail.com>> wrote:
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> Heard of ADSL? POTS?
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> If the Internet was only meant to run over fibre, there wouldn't have been any ARPANET or Internet before the late 1980s or early 1990s.
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> Fun fact, RFC1 was written on a typewriter in a bathroom in 1969, because Steve didn't want to disturb his flatmates.
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> https://tools.ietf.org/html/rfc1 <https://tools.ietf.org/html/rfc1>
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> BCP89.
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