What can I do, and what improvements can I expect?

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satyr
Posts: 39
Joined: Fri Feb 15, 2008 3:38 pm
Location: melbourne

What can I do, and what improvements can I expect?

Post by satyr » Sun Mar 09, 2008 2:59 am

I have Naked ADSL2+ (allegedly) $50 pcm 8/48 plan.

Before signing up, I rang Exetel and asked them on several occasions whether their Naked ADSL plans were 2+, or some variant of 8 Mbps, or 12 Mbps. They all insisted that it was true ADSL2+, with theoretical speeds of 24 Mbps, and not theoretical speeds of 12 or 8 mbps of other ADSL variants.

Since connecting I find that my highest sync rates are no more than 11,400 kbps.

http://i100.photobucket.com/albums/m2/s ... emsync.gif

My physical distance from the exchange is 1,356 meters, and electrical distance is 2,102 meters. According to various calculators I should be attaining sync rates of up to 18,000 kbps, but no less than 13,000 kbps (according to the worst ones).

http://i100.photobucket.com/albums/m2/s ... speeds.jpg

http://i100.photobucket.com/albums/m2/s ... lspeed.gif

My D-Link G604T modem shows Attenuation to be 24 dB, and not 37 dB as it would be if ADSL2+ 24 mbps is attenuated to 11 mbps over 2,102 meters.

Because this is a naked account, the modem is the only device which is connected to the line, and is connected directly. The MTU is optimised and set to 1464.

Image

And the above test was done using the Exetel mirror. Admittadly I have gotten results as high as 9 mbps, Image

But on average they're closer to 5 mbps, and that is again to ONLY Sydney or Melbourne ISP's.

Ozspeedtests show a different story;

[`[*Test Results from <a href="http://www.ozspeedtest.com">Oz Broadband Speed Test</a>*]`]
[(----------------------------------
Test run on [*09/03/2008*] @ [*02:34 AM*]

Mirror: [*Exetel*]
Data: [*3 MB*]
Test Time: [*13.34 secs*]

Your line speed is [*1.84 Mbps*] (1836 kbps).
Your download speed is [*230 KB/s*] (0.22 MB/s). )]

[`[*Test Results from <a href="http://www.ozspeedtest.com">Oz Broadband Speed Test</a>*]`]
[(----------------------------------
Test run on [*09/03/2008*] @ [*02:36 AM*]

Mirror: [*Exetel*]
Data: [*9 MB*]
Test Time: [*32.59 secs*]

Your line speed is [*2.32 Mbps*] (2320 kbps).
Your download speed is [*290 KB/s*] (0.28 MB/s). )]

[`[*Test Results from <a href="http://www.ozspeedtest.com">Oz Broadband Speed Test</a>*]`]
[(----------------------------------
Test run on [*09/03/2008*] @ [*02:38 AM*]

Mirror: [*Exetel*]
Data: [*15 MB*]
Test Time: [*54.71 secs*]

Your line speed is [*2.29 Mbps*] (2291 kbps).
Your download speed is [*286 KB/s*] (0.28 MB/s). )]

Yes, I realise the above are after midnight, but even during the day, they do not get much higher than 3.5 mbps.

Download speeds from anywhere outside of Australia (eg McAfee, etc) have been no different to the download speeds when I had 1500/256 ADSL.

So what are your suggestions for increasing sync rates? I have followed the Exetel suggestions, including MTU rate optimisation.

And how can I get something respectable compared with say TPG ADSL2+. My friend who is 3 km from his exchange syncs at 14 mbps with his TPG ADSL2+ Super2 account.

This is not only disappointing, but also an embarrassment for Exetel.

NetworkAdmin
Exetel Staff
Posts: 559
Joined: Tue Jan 06, 2004 1:19 am
Contact:

Re: What can I do, and what improvements can I expect?

Post by NetworkAdmin » Sun Mar 09, 2008 3:38 am

Before signing up, I rang Exetel and asked them on several occasions whether their Naked ADSL plans were 2+, or some variant of 8 [Mbps, or 12 Mbps. They all insisted that it was true ADSL2+
As it is.
with theoretical speeds of 24 Mbps, and not theoretical speeds of 12 or 8 mbps of other ADSL variants.
There is no ADSL service in Australia that runs at 12 mbps - the highest possible speed is 8192 that is not achieved by more than a handful of users.
Since connecting I find that my highest sync rates are no more than 11,400 kbps.

http://i100.photobucket.com/albums/m2/s ... emsync.gif

My physical distance from the exchange is 1,356 meters, and electrical distance is 2,102 meters. According to various calculators I should be attaining sync rates of up to 18,000 kbps, but no less than 13,000 kbps (according to the worst ones).

http://i100.photobucket.com/albums/m2/s ... speeds.jpg

http://i100.photobucket.com/albums/m2/s ... lspeed.gif

My D-Link G604T modem shows Attenuation to be 24 dB, and not 37 dB as it would be if ADSL2+ 24 mbps is attenuated to 11 mbps over 2,102 meters.
The line width and quality of repair are the major determinants of line speed.
[`[*Test Results from <a href="http://www.ozspeedtest.com">Oz Broadband Speed Test</a>*]`]
[(----------------------------------
Test run on [*09/03/2008*] @ [*02:34 AM*]

Mirror: [*Exetel*]
Data: [*3 MB*]
Test Time: [*13.34 secs*]

Your line speed is [*1.84 Mbps*] (1836 kbps).
Your download speed is [*230 KB/s*] (0.22 MB/s). )]

[`[*Test Results from <a href="http://www.ozspeedtest.com">Oz Broadband Speed Test</a>*]`]
[(----------------------------------
Test run on [*09/03/2008*] @ [*02:36 AM*]

Mirror: [*Exetel*]
Data: [*9 MB*]
Test Time: [*32.59 secs*]

Your line speed is [*2.32 Mbps*] (2320 kbps).
Your download speed is [*290 KB/s*] (0.28 MB/s). )]

[`[*Test Results from <a href="http://www.ozspeedtest.com">Oz Broadband Speed Test</a>*]`]
[(----------------------------------
Test run on [*09/03/2008*] @ [*02:38 AM*]

Mirror: [*Exetel*]
Data: [*15 MB*]
Test Time: [*54.71 secs*]

Your line speed is [*2.29 Mbps*] (2291 kbps).
Your download speed is [*286 KB/s*] (0.28 MB/s). )]

Yes, I realise the above are after midnight, but even during the day, they do not get much higher than 3.5 mbps.
Within the expected range.
Download speeds from anywhere outside of Australia (eg McAfee, etc) have been no different to the download speeds when I had 1500/256 ADSL.
Many commercial sites limit single session downloads so as not to over tax the ftp servers. If the update was coming from our Akamai server, it would be pretty much line speed, so I guess it isn't.
So what are your suggestions for increasing sync rates? I have followed the Exetel suggestions, including MTU rate optimisation.

And how can I get something respectable compared with say TPG ADSL2+. My friend who is 3 km from his exchange syncs at 14 mbps with his TPG ADSL2+ Super2 account.
The options are not great. MTU is only going to make a very minute difference. It sounds line you are getting close to optimal for your line anyway. I would check the line encoding and DSL protocol type for your modem against the suggested best settings in the FAQ's.

If you think you have a problem with the line that is affecting your sync speed, you can open a fault and we can arrange for a carrier field tech to check the line. If they find a problem they will fix it, if they don't you will be billed to the call out free - about $120 I think.
This is not only disappointing, but also an embarrassment for Exetel.
It's a common experience for ADSL2 users around Australia. What someone else achieves in the same suburb is completely irrelevant as the speed achieved is very much dependent on the individual line.

dogwomble
Posts: 375
Joined: Sat Mar 17, 2007 12:21 am

Post by dogwomble » Sun Mar 09, 2008 10:19 am

The long and short of it is that, even on ADSL2, if you're getting those sync speeds you're doing well!

ADSL2+ is theoretically capable of 24 mbit speeds. To achieve these sorts of speeds, you'd have to move into a home next door to the exchange and have the phone cable routed so that it's the shortest possible distance to the exchange. In other words, chances are almost nobody in Australia will ever achieve the full 24 mbit.

The ADSL2+ signal drops off very quickly after leaving the exchange. The length of cable between my property and the exchange I'm on is approx. 3.2 kilometers (in a straight line I am 2.4 kilometers from the exchange) and I sync at about 5.7 megabit.

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