[AusNOG] NBN FTTC services and power hits

Mon Jan 3 21:17:27 AEDT 2022

If you are getting a RED LINK LIGHT on the NCD, then there is a fault where
it cannot supply reverse power to the DPU.

Either a DPU or NCD fault, requiring the RSP to log a fault with NBNCo to
investigate.

On Mon, Jan 3, 2022 at 9:13 PM Chris Chaundy <chris.chaundy at gmail.com>
wrote:

> BTW, I’m getting a red flashing link light on the NCD but if I unplug it
> from the wall, the link light changes to blue (still flashing) so it seems
> to be talking to the DPU, but maybe getting some fault indication?
>
> Sent from my iPhone
>
> On 3 Jan 2022, at 20:55, Chris Chaundy <chris.chaundy at gmail.com> wrote:
>
> 
> Hi Greg,
>
> Thanks for the info (a fair bit I was already aware of though) but up
> where I am, pretty much everyone has their own DPU (big properties along a
> dirt road.  No concern with pits full of water though - everything is on
> power poles including the DPUs and the fibre that connects them back to the
> network (plus the copper feed into my house)!  It does go underground
> further down the mountain near the township but I'm not sure where the next
> 'active' kit is located (there is a lot of reading in the document the link
> you sent :-).
>
> These are not brief hits but outages that have lasted for days.  Your
> comment about the DPU losing its configuration is interesting though and
> may well be the issue.  I hope they replace it when NBNco visits me
> tomorrow!
>
> Cheers, Chris
>
> Sent from my iPhone
>
> On 3 Jan 2022, at 19:55, Greg Lipschitz <glipschitz at summitinternet.com.au>
> wrote:
>
> 
> Hi Chris,
>
> The nbn DPU (the "mini-vdsl/gfast dslam" which lives in the pit) is
> reverse powered (about 6-14W) from the NCD (the nbn box inside your house).
> nbn use a mix of Netcomm and more recently Nokia DPU's. The DPU only
> needs 1 customer NCD connected to it to supply the power.
>
> The DPU can connect up to 4 premises and the interesting thing is that any
> of the RSP's who have a customer connected to the DPU can initiate a DPU
> reset via the nbn API.
>
> So, you might be with Telstra, and your neighbours with Aussie Broadband,
> TPG and Optus and any one of them can essentially cause your service to
> drop momentarily if they contact their RSP who initiates the DPU reset as
> part of the troubleshooting.
>
> We've found that the DPU's often suffer the same fate as the old ADSL
> copper services when the pit fills up with water, the DPU goes off to la-la
> land (who would have thunk power and water didn't mix!) or the copper
> between the DPU and the customer gets corroded and needs to be cleaned up
> or replaced.
>
> I've not heard of power issues causing the DPU to have issues. It sounds
> like the DPU is perhaps losing its config when there's a power interruption
> (we've certainly seen that with the Telstra EA MRV OS904 NTU's over the
> years).
>
> If you're interested how it all comes together, nbn publish their design
> docs -
> https://www.nbnco.com.au/content/dam/nbn/documents/sell/sau/network-design-rules-20210630.pdf
>
> Cheers
> Greg
>
>
>
>
> Greg Lipschitz  |  Founder & CEO  |  Summit Internet
> *glipschitz at summitinternet.com.au* <glipschitz at summitinternet.com.au>
> *summitinternet.com.au* <http://summitinternet.com.au>
> *1300 049 749* <1300%20049%20749>
> *Unit 2, 31-39 Norcal Road, Nunawading VIC 3131*
> <https://www.google.com/maps?cid=12522583051503623677&_ga=2.149009334.1057584350.1554770858-1081443428.1554770858>
> [image: Summit Internet] <http://summitinternet.com.au>
> ------------------------------
> *From:* AusNOG <ausnog-bounces at lists.ausnog.net> on behalf of Chris
> Chaundy <chris.chaundy at gmail.com>
> *Sent:* 03 January 2022 09:26
> *To:* ausnog at ausnog.net <ausnog at lists.ausnog.net>
> *Subject:* [AusNOG] NBN FTTC services and power hits
>
> Is there anyone from NBNco on this list willing to discuss this with me?
>
> It seems that every time there is a power hit in our locality (which with
> Ausnet is pretty regularly), the FTTC services die and don’t come back
> until you log a fault through the provider (in my case, Telstra) and then
> wait for them to go through the hoops of dealing with NBNco.
>
> This has happened four times in the last couple of months (thankfully I
> have 4G backup).  There must be some aggregator kit that has no power
> backup or cannot recover from power outages - pretty crap really. :-|
>
> Sorry if this is a little OT for the list but I’d be interested if other
> FTTC areas see the same problem.
>
> Sent from my iPhone
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