Two questions about ADSL

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zespri

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#203167 20-Sep-2016 11:15

Hello all,

so I had a somewhat unsatisfying switch from Slingshot ADSL to Bigpipe VDSL.

It turned out that I have a very long line, and my ADSL speeds are better than VDSL ones. So I switched back to ADSL with Bigpipe.

Here are my questions:

Is there a DLM on ADSL, or is this something VDSL specific?
I'm getting about 30% better sync speed with Slingshot comparing what I'm having now with Bigpipe as per these screenshots:

Slingshot:

Bigpipe:

I'm considering going back to Slingshot. I'm hoping that since Slingshot is using UCLL and Bigpipe is using Chorus, this difference is due to equipment.

My question is, is it likely, if I go back to Slingshot, that I'll get my sync rate up again?

Thank you in advance!

l43a2

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#1636467 20-Sep-2016 11:22

hi, there is no DLM on ADSL, the speed change is due to the fact you left slingshots unbundled network and back onto chorus's network which uses a higher line profile to keep the connection more stable.

Detruire

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#1636469 20-Sep-2016 11:23

There is no DLM for DSL, and it is likely that you're right about unbundled vs Chorus gear.

The unbundled gear will accept connections with a lower signal to noise ratio ~6db vs Chorus' ~12db.

Depending on your modem and how restricted your access is (such as by ISP firmware), you may be able to tweak the SNR the modem syncs at.

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BarTender

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#1636606 20-Sep-2016 15:38

DLM is coming to ADSL. Chorus have been talking about it. I suspect by early next year.

But for the moment it's just if you are on Chorus or a UCLL as per the above posts.

hio77

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#1636627 20-Sep-2016 16:05

BarTender: DLM is coming to ADSL. Chorus have been talking about it. I suspect by early next year.

But for the moment it's just if you are on Chorus or a UCLL as per the above posts.

i didnt know that fact was public yet. Good to know!

Most definitely is a case of UCLL compared to wholesale.

Personally in your situation i would meet midway, Move back to UCLL and go annex M.

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noroad

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#1636635 20-Sep-2016 16:12

hio77:

Most definitely is a case of UCLL compared to wholesale.

Personally in your situation i would meet midway, Move back to UCLL and go annex M.

+1 for this, I would say go back to UCLL and enable Annex M on your router. NOt sure about anyone else, but Annex M will work on Slingshot, Orcon and Flip UCLL.

Detruire

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#1636636 20-Sep-2016 16:14

Annex M sacrifices downstream rate for upstream rate, so that may not be what OP is after.

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hio77

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#1636651 20-Sep-2016 16:25

Detruire: Annex M sacrifices downstream rate for upstream rate, so that may not be what OP is after.

As stated, as a midway personally i would go for it.

Then you get the jump in upstream, and a bit of a jump back up in downstream. Ild conservatively estimate 15/2 wouldnt be unreasonable to see.

zespri:

What does that mean, go annex M? How does one do this?

annex M is a modulation that uses some of the downstream band to offer a faster upstream.

Upstream congestion is often the biggest issue faced on adsl, a good 10+mbit down can easily congest 1mbit up in acks alone.

The option will be within your routers menu, Annex M is not supported on wholesale gear.

Slingshot should do a 6dB SNR profile on UCLL, if your not on that i would switch to it (assuming you have a master filter installed to reduce risk of errors causing instability)

Generally i would not support going with any medium which adds to crosstalk (which annex M does) but in this situation i am certainly a supporter of it.

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noroad

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#1636654 20-Sep-2016 16:27

Detruire: Annex M sacrifices downstream rate for upstream rate, so that may not be what OP is after.

It is a very small sacrifice of downstream and in practice and increasing the up-link from 1 to 2Mb/s makes a big difference (especially with cloud apps like dropbox).

zespri

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#1636658 20-Sep-2016 16:30

hio77:

Upstream congestion is often the biggest issue faced on adsl, a good 10+mbit down can easily congest 1mbit up in acks alone.

The option will be within your routers menu, Annex M is not supported on wholesale gear.

Slingshot should do a 6dB SNR profile on UCLL, if your not on that i would switch to it (assuming you have a master filter installed to reduce risk of errors causing instability)

When I was on Slingshot SNR used to be 5, someone commented on this as being strange.

The modem (Vigor 130) has the Annex M/J selection, so I'm guessing that's what I should be after. Thank you for your help!

hio77

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Lizard Networks

#1636661 20-Sep-2016 16:32

zespri:

hio77:

Upstream congestion is often the biggest issue faced on adsl, a good 10+mbit down can easily congest 1mbit up in acks alone.

The option will be within your routers menu, Annex M is not supported on wholesale gear.

Slingshot should do a 6dB SNR profile on UCLL, if your not on that i would switch to it (assuming you have a master filter installed to reduce risk of errors causing instability)

When I was on Slingshot SNR used to be 5, someone commented on this as being strange.

The modem (Vigor 130) has the Annex M/J selection, so I'm guessing that's what I should be after. Thank you for your help!

That would have been a 6dB training margin with the noise around you increasing.

In practice, considering rounding it wont account for much if anything at all.

#include <std_disclaimer>

Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.