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 <[email protected]> wrote: > > Yeah, sounds to me like the NTDs just aren't very well designed. > > 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. > > On Thu, Jan 21, 2021 at 10:50 AM Paul Julian <[email protected] > <mailto:[email protected]>> 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. > > > > 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. > > > > 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 😊 > > > > 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. > > > > 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. > > > > 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. > > > > Regards > > Paul > > > > From: AusNOG <[email protected] > <mailto:[email protected]>> On Behalf Of Brendan Ord > Sent: Thursday, 21 January 2021 10:36 AM > To: Damien Gardner Jnr <[email protected] <mailto:[email protected]>> > Cc: [email protected] <mailto:[email protected]> <[email protected] > <mailto:[email protected]>> > Subject: Re: [AusNOG] Lightning and FTTC - is it really this bad? > > > > 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. > > > > I smell a lot of agenda pushing and bias in this article and that’s about all > it is. > > > > Although, maybe a more important topic mentioned in the article – NBN won’t > allow these businesses to buy a cold spare?!? > > > > Brendan Ord > > > > > > From: AusNOG <[email protected] > <mailto:[email protected]>> On Behalf Of Damien Gardner Jnr > Sent: Thursday, 21 January 2021 9:11 AM > To: Troy Kelly <[email protected] <mailto:[email protected]>> > Cc: [email protected] <mailto:[email protected]> <[email protected] > <mailto:[email protected]>> > Subject: Re: [AusNOG] Lightning and FTTC - is it really this bad? > > > > 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?? > > > > Something doesn’t make sense here.. > > > > —DG > > > > On Thu, 21 Jan 2021 at 8:25 am, Troy Kelly <[email protected] > <mailto:[email protected]>> wrote: > > Yes Mark, I've heard of it ;) > > > > 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. > > > > Regards, Troy > > Brevity is the elixir of life. > > Father Hector McGrath, Pixie 2020 > > > > > > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ > > On Wednesday, 20 January 2021 10:15 PM, Mark Smith <[email protected] > <mailto:[email protected]>> wrote: > > > > Heard of ADSL? POTS? > > > > 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. > > > > Fun fact, RFC1 was written on a typewriter in a bathroom in 1969, because > Steve didn't want to disturb his flatmates. > > > > https://tools.ietf.org/html/rfc1 <https://tools.ietf.org/html/rfc1> > > > BCP89. > > > > > > _______________________________________________ > AusNOG mailing list > [email protected] <mailto:[email protected]> > http://lists.ausnog.net/mailman/listinfo/ausnog > <http://lists.ausnog.net/mailman/listinfo/ausnog> > _______________________________________________ > AusNOG mailing list > [email protected] > http://lists.ausnog.net/mailman/listinfo/ausnog
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