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Topic # 107990 23-Aug-2012 10:48 Send private message

Hi,

I'm having some trouble with my sync speeds and after having read a bunch of very telco-technical geekzone threads I was wondering if anyone could provide some advice:

Line is with Telecom, ASDL provider is ICONZ (their 100GB plan). I'm using a Dlink G604T with the latest available firmware (which is from 2006). A typical sync scenario looks like this:

ADSL Firmware Version:5.00.04.00 - 5.00.03.00 - 5.00.03.00 Annex A - 01.07.2b - 0.52ADSL Software Version:V3.00B02.NZ.20060711Line StateConnectedModulationADSL_2plusAnnex ModeAnnex AMax Tx Power-38 dBm/Hz ItemDownstreamUpstreamUnitSNR Margin1515dBLine Attenuation215dBData Rate6754675kbps SNR Margin varies between 12 and 16 both down- und upstream.

Line Attenuation is quite stable and a data rate around 7000/700 kbps is quite typical. I've had up to 7500 down and 800 up before - but it varies. I've never seen ADSL2+ - like speeds of 8000 down or more. I'm in Welington/Karori, not sure if on an exchange or a cabinet and ICONZ claims (their tech support) that I have ADSL2+.

Now - I know that this is a theoretical best-case scenario, but according to the internode graph (http://iforce.co.nz/i/667e93bec35e8024c9191f1ea3e0e17c.jpg) my line attenuation indicates that I'd be around 1500-1700 meters from the exchange and on ADSL2+ could reach possible a downstream sync of 20000 kbps. Given where I live, 1500-1700 meters would be somewhere in central Karori and could well make sense for where the exchange is.

Is there a way to find out the locations of the exchanges. I've seen the Telecom Wholesale maps, but I can't see how I could deduce from that information to the location of the exchange or a cabinet.

1. I'm not even sure if the ICONZ people are telling me the truth given that I've never had speeds in the ADSL2+ range. Their website on no occasion mentions ADSL2 or ADSL2+ either. The fact that my modem syncs on ADSL_2plus modulation is from what I understand not really an indication if I'm on a plan allowing ADSL2+ speeds. Does anyone know if ICONZ even offers setups and plans that allow this speed - how can I check if they're not just telling my bullsh*t?

2. My home wiring is certainly not great an can probably do with some improvement and a master splitter etc. Fro what I can see all the line filters and splitters are applied correctly, I've done some isolation testing with all phones unplugged, the modem connecting directly (which made attaining sync speeds of around 7500 down possible more consistently). We also have an alarm (adding this a year ago or so didn't make a difference at all in SNR Margin,LA or the sync speeds I'm seeing). Is there anyone in Wellington offering a good installation and tune-up service like the user Coffeebaron does for Auckland and the Waikato? I'm not sure that a random local electrician would be up to the job from what I could read on the forums.

3. Are there any other suggestions of what I could try to improve the DSL connection speed at my place? Any help/suggestion very appreciated.

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  Reply # 675847 23-Aug-2012 10:52 Send private message

Oh, sorry - here's the ADSL modem report screen properly formatted:

Firmware Version: 5.00.04.00 - 5.00.03.00 - 5.00.03.00 Annex A - 01.07.2b - 0.52
ADSL Software Version: V3.00B02.NZ.20060711
Modulation: ADSL_2plus
Annex Mode: Annex A
Max Tx Power: -38 dBm/Hz

SNR Margin: Downstream 15, Upstream 15
Line Attenuation: Downstream 21, Upstream 5
Data Rate: Downstream 6754, Upstream 675

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  Reply # 675850 23-Aug-2012 11:09 Send private message

Get a master splitter installed before going any further






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  Reply # 675851 23-Aug-2012 11:13 Send private message

Thanks - I'm def. happy to do that. You couldn't suggest someone in the Wellington area doing that by any chance?

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  Reply # 675857 23-Aug-2012 11:34 Send private message

What revision is that modem? Revision A requires a firmware update to do ADSL2+

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  Reply # 675859 23-Aug-2012 11:36 Send private message

Are you in a 10Mbps zone on the Chorus SAT? If you are and are in a VDSL coverage area your sync speeds should be far better than this, and your internal wiring would be the first thing to look at.

Those modems are also very average, and the early ones don't do ADSL2+ from memory, although there was a firmware upgrade for some.





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  Reply # 675864 23-Aug-2012 11:46 Send private message

kyhwana2: What revision is that modem? Revision A requires a firmware update to do ADSL2+


According to the DLINK page: http://www.dlink.com.au/tech/Download/download.aspx?product=DSL-G604T_NZ I'm on the latest (ADSL2+) firmware.

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  Reply # 675865 23-Aug-2012 11:50 Send private message

+1 for master splitter. No Coffeebaron in Wellington :( - who is his equivalent there?







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  Reply # 675867 23-Aug-2012 11:54 Send private message

sbiddle: Are you in a 10Mbps zone on the Chorus SAT? If you are and are in a VDSL coverage area your sync speeds should be far better than this, and your internal wiring would be the first thing to look at.

Those modems are also very average, and the early ones don't do ADSL2+ from memory, although there was a firmware upgrade for some.



I'm within the dark blue 10Mbps zone, yes. Not in the VDSL2 zone though - short of it about 15 houses down the road. The "capability at this address" says ADSL2+. Connected to the Karori Exchange from what I can see, not to a cabinet.

Re firmware see my other post - it's up to the latest one (which apparently made it ADSL2+ compatible)

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  Reply # 675879 23-Aug-2012 12:11 Send private message

Hi, I have seen 604's that were meant to do ADSL2+ (according to the same documentation you have linked) but never would budge beyond the figures you are getting.

I strongly recommend you get a new modem.

As for filters, I did do this work for a while, but back in an engineering office again, not too sure who else does filters at a reasonable price, and sorry my Saturdays are for riding my motorcycle now rather than noting the mice in your ceiling :)

Cyril

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  Reply # 675882 23-Aug-2012 12:20 Send private message

If you want a cheap modem to test if that's your issue, try looking for an RTA1320 on trademe; should get one for ~$5 or less. Flash with the latest firmware and they work great (IIRC it worked great even on stock firmware) When on ADSL I tried a Thomson, linksys, TP-Link and even Fritzbox for a little while. My trusty little RTA1320 worked just as well as the best of any of them.

With the added bonuses that if you ever feel like trying half-bridging to a standalone router + SNR tweaking worked pretty well in my experience too.


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  Reply # 675892 23-Aug-2012 12:43 Send private message

I recently got a Netgear DG modem from TradeMe and flashed it with DG team's custom firmware. I highly recomend it. I am currently syncing at 17Mb/s compared to the stock settings on stock firmware which was maximum 13Mb/s at best.

The firmware gives you the option to adjust the SNR to tweak the settings for the best possible stable connection.

After the master splitter install, I highly recommend one of these modems. Stable under load too!





Sometimes what you don't get is a blessing in disguise!



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  Reply # 676002 23-Aug-2012 16:11 Send private message

DravidDavid: I recently got a Netgear DG modem from TradeMe and flashed it with DG team's custom firmware. I highly recomend it. I am currently syncing at 17Mb/s compared to the stock settings on stock firmware which was maximum 13Mb/s at best.

The firmware gives you the option to adjust the SNR to tweak the settings for the best possible stable connection.

After the master splitter install, I highly recommend one of these modems. Stable under load too!


Thx, will try to get my hands on one of those.



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  Reply # 676009 23-Aug-2012 16:16 Send private message

cyril7: Hi, I have seen 604's that were meant to do ADSL2+ (according to the same documentation you have linked) but never would budge beyond the figures you are getting.

I strongly recommend you get a new modem.

As for filters, I did do this work for a while, but back in an engineering office again, not too sure who else does filters at a reasonable price, and sorry my Saturdays are for riding my motorcycle now rather than noting the mice in your ceiling :)

Cyril


I've actually seen the info that the 604T might be a roadblock to "full" *depending on one's line* ADSL2+ speed. Will tackle that as well.

Fair enough re the master filter :)

What are my realistic (or best) options then - go with Chorus via my ISP (Iconz) for NZ$149 as other people suggested get a local electrician to do it?



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  Reply # 676012 23-Aug-2012 16:22 Send private message

A quick update:

Spoke to the guys at Iconz again today as well and opened a formal ticket. They were actually really helpful.

- they did a port reset 
- they requested a profile change on Chorus which apparently has happened "...just received confirmation that you have been transferred from an RM to an AM profile."

After each change, I rebooted the modem but no _significant_ change in sync speed, however It seems that I'm getting more consistently data rates at about 7300/800 now.

I guess my next step is the master filter and at the same time getting my hands on a different modem to see if and how the 604T is contributing to the situation.

Thanks for everyone's help so far!

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  Reply # 676013 23-Aug-2012 16:26 Send private message

Hi, how practical with simple wiring tasks, its not actually hard to install, the hardest part is to identify how your wiring is layed out.

Maybe even tell us about the wiring as you understand it now.

Cyril

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