[AusNOG] NBN FTTC services and power hits

Mon Jan 3 20:55:38 AEDT 2022

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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