[Snap] VDSL Trial on Snap

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#434260 2-Feb-2011 13:26

Interleaving is error correction isn't it? I'm surprised they would let you turn it off

wjw

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#434273 2-Feb-2011 13:55

markpetrie: oh and WJW - does this mean you are happy to cancel that special cable connection you happen to have at your house:) you would need to work out routing your native IPv6 allocation to it too!

Need to get cabinetised first...

Beccara: Interleaving is error correction isn't it? I'm surprised they would let you turn it off

Many moons ago I setup VDSL at a ski field in Cadrona, the amount of interferance between the 12 subs I had caused the speed to drop considerably when interleaving was turned off.

juha

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#434296 2-Feb-2011 14:59

Beccara: Interleaving is error correction isn't it? I'm surprised they would let you turn it off

I'm curious too why it's not optional, when it is on ADSL2+. VDSL2 won't ever be delivered from distances over 6-700 metres... is interleaving still necessary, if the line is good?

Juha

wjw

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#434302 2-Feb-2011 15:06

juha:
Beccara: Interleaving is error correction isn't it? I'm surprised they would let you turn it off

I'm curious too why it's not optional, when it is on ADSL2+. VDSL2 won't ever be delivered from distances over 6-700 metres... is interleaving still necessary, if the line is good?

Probably, in the instance I was talking about, the copper only shared the same conduit for the first 1000m then split.

cyril7

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#435669 5-Feb-2011 15:14

Hi, older VDSL (not VDSL2) modulation was not very compatible with ADLS2 carriers in the same wrapper. Basically VDSL1 was not aligned with ADSL and the Power density profiles that allowed good compatibility with ADSL. VDSL2 on the other hand is quite harmonious, relatively speaking.

Cyril

Edit, oh Nick good blog, great to see VDSL2 come out in the light of day.

Mark any news on what the public release will be.

markp

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#435695 5-Feb-2011 17:09

Hi Cyril

I would have to completely agree with you there, from our trial's where we have had a few VDSL2+ lines off the same DSLAM and cable pair we have not noticed any issues (although to be fair we have not really looked at this in great depth) if anything the option to allow interleave off would have been good. - especially as most of the lines running VDSL will be on short copper runs and are unlikely to benefit from interleaving - there is some interesting info on interleaving on the commerce commission's website here http://www.comcom.govt.nz/media-releases/detail/2009/averagebroadbandperformancecontinu

In terms of a public release we are still a good few months away, the Telecom Wholesale service is still in soft launch, so we won’t be launching it until it is in full production. (hopefully this saves some calls to our helpdesk!)

Mark

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Ragnor

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#436097 7-Feb-2011 02:04

You can see why they might not want to have an interleaving off option to begin with in the trial/pilot.

However, surely it's just a profile setting on the line cards in the ISAM? It's well known that the IKANOS line cards in the ISAM's do VDSL2 and ASDL2+, interleaving off is available for ADSL2+ plans so it would be madness to not allow it for VDSL2 from the very same line card.... unless there is a technical reason for it?

scensation

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#436241 7-Feb-2011 12:38

Thanks for posting the results, Nick.

The speednet test results are similar to what I got with TelstraClear's 15/2 cable, while the upload speeds are only slightly better than what I am getting with Slingshot ADSL2+ right now. Mind you though, Slingshot's performance today is actually better than what it has been for the past few days.

I have high regards for Snap and had high hopes for VDSL2+, and was even more excited with the combination of the two. These results dampen my enthusiasm somehow.

Ragnor

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#436250 7-Feb-2011 12:48

Just noticed 12dB noise margin in the screenshot same as ASDL. Telecom are too conservative with these settings, 9dB and 6dB are common overseas and in LLU gear for ADSL here... which allows higher sync rates.

It's a seems a shame to limit everyone's max sync sped by having a conservative noise margin because some lines are bad.

markp

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#436331 7-Feb-2011 15:20

scensation: Thanks for posting the results, Nick.

The speednet test results are similar to what I got with TelstraClear's 15/2 cable, while the upload speeds are only slightly better than what I am getting with Slingshot ADSL2+ right now. Mind you though, Slingshot's performance today is actually better than what it has been for the past few days.

I have high regards for Snap and had high hopes for VDSL2+, and was even more excited with the combination of the two. These results dampen my enthusiasm somehow.

I'm slightly confused, Nik's results show a upload sync of 9Mbit with an attainable sync speed of 29Mbit - which would be substantially faster than the 2Mbit on HFC or ADSL2+? - even the download speeds far exceed 15Mbit on cable or what is achievable on ADSL2+ - are you sure you are looking at the right speedtests on Niks page?

scensation

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#436344 7-Feb-2011 15:50

These are my latest results. Obviously, TCL cable would have been better.

(Nicks: 8.38/5.16)

(Nicks: 7.03/2.49)

(Nicks: 4.78/1.85)

(Nicks: 2.62/0.96)

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#436792 8-Feb-2011 12:58

Not surprised to see speedtest results on Slingshot (especially internationally) that are lower than sync rates, and of course DSL sync rate depends on line conditions/distance/quality etc.

Anyway bask to VDSL2....

Good to see Snap piloting it.

Why isn't Telecom retail offering a pilot of this Telecom wholesale service yet, staff only atmj?

Where are Xnet and Maxnet they are usually early adopters aren't they? Wasn't Orcon taking some volunteers a few months back from GZ too.

lokeynz

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#437214 9-Feb-2011 12:14

Switched over to the VDSL2 trial yesterday afternoon
Bandwidth (Down/Up - kbit/s): 51280/10350
The extra upload speed really helps to keep latency stable for VOIP
This graph shows latency to our VOIP provider, the cutover to interleaved VDSL2 shows the overall ping time going up but it can now keep stable through periods of heavy upload usage.

Mark: Are all connections set to profile 8b by default? Does the line just need to meet certain criteria to be changed to 17a or will it be sold as an optional upgrade?

networkn

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#437223 9-Feb-2011 12:32

I am curious to know (Nick your blog is down), why Nick would only be getting 8Mbit down, as I am on ADSL2+ and getting 12Mbit down already. I would have thought that unless he was only getting really slow speeds before that his down speed would be better (Up speeds look awesome).

lokeynz

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#437230 9-Feb-2011 12:43

I don't know whether it's single thread vs multi thread - my international on speedtest.net is also ~8mbps but a well seeded torrent can happily put through 40mbps with international peers.
Local speedtests aren't far off line speed.

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