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38 posts

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Topic # 110036 2-Oct-2012 00:07 Send private message

Hi all,

I'll try to keep this brief. I'm looking at buying a new modem because my Vodafone (Huawei) modem is a POS really. I actually use Telecom because they update their nameservers almost instantly and Vodafone take 24-48 hours (!!).

Basically, I'm wondering if any brand of modem achieves (e.g. speedtest.net) what it says it is connected as (modem's control panel). I've just moved house and sadly I can't get cable on this street so ADSL it is, and it's pretty slow.

Here's the thing. At my old house:
Modem stated download link: 21 Mbps
Reality (speedtest.net, etc.): 17 Mbps

New house:
Modem: 18.5 Mbps
Reality: 15 Mbps (Crying)

Is there any way to achieve that line speed using a decent modem? Anyone have experience with this?

Cheers,
James

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38 posts

Geek


  Reply # 694576 2-Oct-2012 00:14 Send private message

I'd better add: the real-world speeds I mentioned are the highest that I ever saw. This isn't a one-off test, but many done over several months. 

Also, the upload speed in my case is very important too. Currently, the modem says 1 Mbps upload, however I never get above 0.8 Mbps. It would be great if I could get more than this.

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Spark NZ

  Reply # 694577 2-Oct-2012 00:17 Send private message

jamesmcd: Hi all,

I'll try to keep this brief. I'm looking at buying a new modem because my Vodafone (Huawei) modem is a POS really. I actually use Telecom because they update their nameservers almost instantly and Vodafone take 24-48 hours (!!).

Basically, I'm wondering if any brand of modem achieves (e.g. speedtest.net) what it says it is connected as (modem's control panel). I've just moved house and sadly I can't get cable on this street so ADSL it is, and it's pretty slow.

Here's the thing. At my old house:
Modem stated download link: 21 Mbps
Reality (speedtest.net, etc.): 17 Mbps

New house:
Modem: 18.5 Mbps
Reality: 15 Mbps (Crying)

Is there any way to achieve that line speed using a decent modem? Anyone have experience with this?

Cheers,
James


You will never get a speedtest reporting the same speed as the modem reports sync speed because the speedtest is reporting IP throughput and the modem is reporting a DSL sync speed. They aren't the same.

Without doing the calculations, your figures are pretty much exactly in line with what I would expect.

And you realise that for ADSL2+, 15mbps of actual, proper, tested real world throughput is thoroughly excellent right? You're crying for joy presumably :-)

Cheers - N




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Geek


  Reply # 694578 2-Oct-2012 00:20 Send private message

I thought as much. Haha, 15 is acceptable, but I'd prefer 100 over UFB or Telstra cable ;)

I do remember, however, that with my previous connection the test shot up to 20 Mbps once (definitely uncached). Never happened again...

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  Reply # 694579 2-Oct-2012 00:37 Send private message

Read this...

http://wand.cs.waikato.ac.nz/~513/2006/readings/adsl-2.pdf

moderately complex but does explain the issue...

This is simpler - but only specifically references PPPoE which Telecom don't use...

http://pflog.net/dsl_overhead/

PPPoA has a slightly reduced overhead compared to PPPoE... Basically though, you might as well use their figures of about 86% efficient best case...

21mbps * 0.86 = 18mbps
18.5mbps * 0.86 = 15.9mbps

So yeah, I'd say you're getting pretty much spot on performance.

There are ISPs offering VDSL - it's highly likely if you are getting such good sync speeds that you would see a big improvement (especially upstream) from using VDSL.

Cheers - N

ps. Note some people suggest lower values for the efficiency, down to about 80% - they derive from a mix of packet sizes approximating real world use - while speedtests don't use this type of packet mix.




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  Reply # 694580 2-Oct-2012 00:41 Send private message

Thanks for the info. Regarding VDSL, it's ridiculously expensive from memory?

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  Reply # 694582 2-Oct-2012 00:43 Send private message

jamesmcd: Thanks for the info. Regarding VDSL, it's ridiculously expensive from memory?


Nope. Go and speak to your ISPs of choice and ask them. Several ISPs now offer it. I think it may be a $25-$50/month premium over ADSL.

Cheers - N


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  Reply # 694614 2-Oct-2012 08:43 Send private message

Do you currently have a phone line? I switched to snap naked VDSL and replaced phone line with VOIP and the increase worked out even less than $25 per month.

The uploads slaughter ADSL (9mbps+ on speedtests and on real uploads) and on my line ADSL was only getting 13mbps download (15 with SNR tweaking) while VDSL is giving 32mbps.

I'd highly recommend it and loving snap as my ISP, they rock.



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  Reply # 694668 2-Oct-2012 10:07 Send private message

I did some calling, apparently Telecom don't offer it at all. Snap looks good but wow, those up front costs are mental! 

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  Reply # 694688 2-Oct-2012 10:28 Send private message

I signed up on 2 year contract so modem was half price and connection was free IIRC; I think snap have changed their plans slightly since then so now you can in theory get modem and connection free, but you'll need to check that.

If you're comfortable with a 2 year contract, the big cost will be if you need a master filter (in general you will but search and read on these forums to check - in some scenarios you don't) you can do the master filter install yourself if you're comfortable with that sort of thing - search and read up on it a bit to see what's involved; often it's really easy but sometimes not so much. There are people on the forums here who will do it for less than the chorus quoted prices - depends where you are.




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  Reply # 694692 2-Oct-2012 10:35 Send private message

Ok, I'll call them to be sure of what things cost etc. I probably can't justify this switch just yet anyway as there would be a 199 disconnection fee with Telecom. Man contracts suck.

Wiring is no problem, I have a good friend who's an expert at telephony installations :)

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  Reply # 694696 2-Oct-2012 10:43 Send private message

Oh wow, yeah the new snap signup process is a little scary on step 5. Basically if you already have working ADSL and you move to naked VDSL you most likely don't require anything on Step 5 of the snap signup - if you don't have a master splitter you can do it yourself for probably < $50 or there are folk on the forums who will do it for I believe around $150... the $402 they quote on the snap signup is a bit scary!

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  Reply # 694706 2-Oct-2012 10:57 Send private message

FWIW my connection syncs at a bit over 17mbps, and my downloads can often sit just on 2MB/sec. via my Telecom ADSL2+ connection with a shiny new run of cable to the road.




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