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1045 posts

Uber Geek

#56745 22-Jan-2010 14:19
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Just got myself a new CNET Car-854 wireless router.
Doesn't really have a very intuitive interface - however, after some playing have it all set up and working correctly.

I do have a question about one setting though . . .

Telecom's help pages state taht the adsl mode shoudl be set to G.DMT
With this setting I get a down connection speed of 6048 and up of 576

If I change the setting in the router to ADSL2+ instead I get a down speed of 7396 and up of 645

Is there any reason I shouldn't use the ADSL2+ setting over the G.DMT setting?

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7327 posts

Uber Geek


  #292281 22-Jan-2010 17:34
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Hi, can you post the ADSL line stats from the router, and do you know roughly how far you are from the exchange or cabinet.


1045 posts

Uber Geek

  #292297 22-Jan-2010 19:02
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SNR margin  down 7.0  up 12.5 db
Line attenuation down 25.4 up 17.1
Data rate down 6940 up 641

Has dropped a little from earlier in the day.
This is with the modem set to ADSL2+

Approx 2km from exchange - right on the edge - no planned cabinets as Telecom state am within acceptable distance of exchange.
Speed seems about right as three of my neighbours get about the same connection speeds.


7327 posts

Uber Geek


  #292299 22-Jan-2010 19:07
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You have a 7dB noise margin, this is not good, indicating that there my be some issues with the performance of the cabling in you area.

25dB attenuation should be able to get around twice the speed you are getting, other than the fact that the noise is bad and you have not indicated what you house wiring is like.

90% of DSL issues (according to TelecomNZ) are house wiring issues, and from my experience this is very much the case.


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Uber Geek

  #292305 22-Jan-2010 19:37
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one neighbour has 9db noise and the other 6db - so don't think it is my house wiring.

1045 posts

Uber Geek

  #292695 24-Jan-2010 16:36
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Here's my neighbours settings - I'm on an overhead cable - he is on an underground cable but they both connect up the same pole on the street

Me SNR Down 9.1 Up 11.8        Neighbour down 12.2 Up 40.5
Me line attenuation down 24.4 Up 17.0        Neighbour down 32.5 Up 14.2
Me Data rate down 6631 Up 652       Neighbour down 4647 Up 166 (prob capped by his intrnet provider)

I am on Telecom neighbour is on TelstraClear
Despite me having a worse snr I get a faster connection.

Worth having someone come to check the wiring on the street or do you think it is likely my house?

7327 posts

Uber Geek


  #292715 24-Jan-2010 18:27
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The only way to isolate your house issues is to test at the demarc with all the house wiring disconnected. Once that is done you can decide if its your problem or Chorus's. But regardless, those attenuations (assuming they had 12dB s/n) should support twice the rates you have.


263 posts

Ultimate Geek


  #292763 24-Jan-2010 22:19
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Use adsl2+ as it sounds like your exchange is adsl2 enabled hence the better speeds.

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