Now connected to cabinet - interleaving off or on?

Forums › Spark New Zealand (including Skinny and BigPipe) › Now connected to cabinet - interleaving off or on?

w2krules

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#63954 4-Jul-2010 18:34

Our local cabinet, maybe 300m from the house, has just been commissioned. Connection speed is just over 16 Mb/s, and I can get Speedtest results up to 14 MB/s. So in combination with a Telecom Business plan, I am now a very happy user.

But I note that interleaving is still switched on. Would I be likely to see much of a speed increase if I had this switched off? Router stats (2 wire) are as follows:

Current DSL Connection:

Down Up

Rate:
16189 kbs
964 kbs

Max Rate:
16189 kbs
964 kbs

Noise Margin:
11.6 dB
13.3 dB

Attenuation:
7.5 dB
2.0 dB

Output Power:
15.9 dBm
12.0 dBm

Protocol:
G.DMT2+ Annex A

Channel:
Interleaved

DSLAM Vendor Information
Country: {46336} Vendor: {BDCM} Specific: {37265 }

ATM PVC:
0/100

Rate Cap:
16189 kbs

Attenuation @ 300kHz:
2.7 dB

Uncanceled Echo:
-19.8 dB
Ok

VCXO Frequency Offset:
-29.8 ppm
Ok

Final Receive Gain:
-2.2 dB
Ok

Impulse Noise Comp. Tones:
0
Ok

Excessive Impulse Noise:
0
Ok

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cyril7

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#347741 4-Jul-2010 18:38

Hi, speed normaly drops slightly (not a lot) with interleaving off. Unless you are using it for gaming or SIP trunks then I would leave it as it is.

Cyril

muppet

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#347744 4-Jul-2010 18:44

+1 cyril7

richms

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#347751 4-Jul-2010 18:56

Browsing trademe is heaps snappier with interleaving off, no reason not to turn it off IMO

Richard rich.ms

johnr

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#347760 4-Jul-2010 19:13

If its working well don't try to fix anything that is not broken

w2krules

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#347858 5-Jul-2010 08:53

Thanks for your replies. So I'm more likely to see reduced latency than increased speed?

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cyril7

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#347867 5-Jul-2010 09:01

You will typically see a small reduction in speed with interleaving off, never an increase in speed, basically one is compromised for the other. That said as you are so close to the cabinet the presence of noisy bins that would be dumped with interleaving off is probably very few, so the speed would drop quite minimally but it will not increase.

As Richard said a couple of posts above, reducing the latency right down does make the connection feel a little more snappy, but actual speed does not increase. When browsing and you click on a link your browser is doing lots of short lived connections for DNS then lots of sub elements on other liniked sites within a page, these short payloads can be quite numerous, but quite low in packet size, this is where a low latency can make those flood of short new connections seem faster, even if you reduced the connection speed by a reasonable amount.

The come back on that is if you are browsing to overseas servers, this all becomes irrelevant as shaving 30mS of a 300mS end to end still leaves you with the same sluggish connection.

Cyril

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wreck90

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#347872 5-Jul-2010 09:07

I am around 30-50m from a cabinet.

On the telecom adventurer plan, interleaving on, my ping was around 43ms, download speed at around 1.75MB/s.

So, with nothing to lose (telecom will re-enable interleaving if the service quality degrades), I asked them to switch interleaving off.

A day later, my ping dropped from 43ms to 23ms, and , transfer speed increased from 1.75MB/s to just over 2MB/s.

Well worth the effort, except I can blow my whole months data cap in a under 2 hours. At these speeds, the caps look like Mr Bean.

wreck90

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#347884 5-Jul-2010 09:30

cyril7: You will typically see a small reduction in speed with interleaving off, never an increase in speed, basically one is compromised for the other. That said as you are so close to the cabinet the presence of noisy bins that would be dumped with interleaving off is probably very few, so the speed would drop quite minimally but it will not increase.

Cyril

My actual experience differs, download speed increased from around 1.75MB/s to just over 2MB/s after interleaving switched off. Upload speed did not change much though.

And, this is certainly seems to be the case, I often use speedtest.net to check my speed, and downloading larger files such as itunes is definitely faster.

One thing though, I use the telecom 2wire modem - this is a very good modem specifically configured and tested by telecom to be optimum on their network.

The sync speed as reported on my modem webpage...(prior to interleaving off, it measured around 18,000Kbps)

Broadband

download

21213Kbps

736Kbps

And, from speedtest.net, this is typical my speed now, over 18Mb/s . Sometimes it will read a little slower or faster, depending on network congestion I suppose ....(before interleaving off ,the typical speed was over 15Mb/s).....

It seems too much of a coincidence that after I disable interleaving my speed increases measurably.

wreck90

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#347885 5-Jul-2010 09:30

cyril7: You will typically see a small reduction in speed with interleaving off, never an increase in speed, basically one is compromised for the other. That said as you are so close to the cabinet the presence of noisy bins that would be dumped with interleaving off is probably very few, so the speed would drop quite minimally but it will not increase.

Cyril

21213Kbps

It seems too much of a coincidence that after I disable interleaving my speed increases measurably.

cyril7

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#347892 5-Jul-2010 09:37

Hi, as I stated in the above post if you are very close to the cabinet then interleaving off may not show any decrease in speed, any increase is unlikely and not expected.

Interleaving is a noise spreading mechanisim, however if you are not suffering any noise issues (which is very very likely on a short tail) then when interleaving is turned off the modem does not see any bins that are marginal (noise wise) so continues to use them, hence no speed change.

In a typical scenario where interleaving has benefit, ie longer lines in heavily used feeders (read lots of interference and noise) then turning interleaving off will force the modem to take a more conservative result to what bins it uses or not as the link is now more prone to noise issues, this will reduce speed.

As to why your speed went up, this is possbily more related to the actual latency reduction so acks etc are returned sooner, so the overall speed goes up, however in a normal longer line overall speed will drop.

Cyril

w2krules

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#348019 5-Jul-2010 14:34

Sounds like it might be worth a try. I recall reading an ADSL 2 modem test in an Aussie computer mag some time ago, and they had to turn off interleaving to get maximum performance. I can always get it turned back on if there are any problems.

In the course of checking my router settings (it's a 2 wire supplied by Telecom), I found that the DNS settings were NOT the current Xtra DNS servers. Setting these manually has certainly improved my browsing experience - it's something that I normally do anyway with a new router.

I was a geek before the word was invented!