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998 posts

Ultimate Geek


#11454 24-Jan-2007 10:42
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Firstly my thanks to Xnet for getting my HSI 'River' FS down broadband expedited on Sat [I moved into my new home Fri night] having come from Telstra Cable I was apprehensive about getting adsl [my only choice]

I am curious as to why I don't get more than 2Mbit down so could the following noise levels be why this is so, or is the noise level an indication of distance from the exchange ? [I do get the 128 upstream]

downstream noise margin 13.9 dB
upstream noise margin 24 dB

I can also supply the output power and line attenuation figures too. Prior to getting this connection TCNZ wouldn't tell me how far from the exchange/dslam I am

The new house cabling is all Cat5E UTP, the modem a Dynalink RTA1320 which I am quite impressed with :)

Don't get me wrong I am quite happy content with what I get esp as mentioned having come from a 2Mbit TCL cable service and having read and heard of so many issues with dsl performance and reliability

Thank you again to Xnet so far so good Smile

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334 posts

Ultimate Geek


  #58718 24-Jan-2007 12:21
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Hi Xlinknz,

Here is a guide on attenuation and noise margins. It looks like your connection should be fine given the detail below. You should be able to break the 2Mb mark however there may be some restrictions which apply to your circuit. It might pay to send an email to with your user name & the query.

Attenuation Rates:
20bB. and below = Outstanding
20dB-30dB. = Excellent
30dB-40dB. = Very Good
40dB-50dB. = Good
50dB-60dB. = Poor and may experience connectivity issues
60dB. and above = Bad and will experience connectivity issues

For S/N Margin Readings:

6bB. or below = Bad and will experience no line synchronisation or intermittent synchronisation problems.
7dB-10dB. = Fair but does not leave much room for variances in conditions.
11dB-20dB. = Good with little or no synchronisation problems
20dB-28dB. = Excellent
29dB. or above = Outstanding


2064 posts

Uber Geek

Lifetime subscriber

  #58769 24-Jan-2007 20:48
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Many factors affect performance. But the most common is that much of NZ is connected to a Telecom exchange, and the copper run from an exchange is 0 to 8km. In some cases repeaters are installed along the way to boost the signal, but this effectively caps your speed to 2mb/s.

Some lucky folk are on a cabinet, which breaks the run down. But that's far and few between.

ADSL only goes so far. At 2km it's ok - I used to be on Courtenay Place exchange, and my max speed was 2.2mb/s. At 4km you're pushing 256k. Any further you're pushing something uphill :-)

And of course, you might just be on a service that is capped at 2mb/s downstream....





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998 posts

Ultimate Geek


  #58802 25-Jan-2007 09:21
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I tool Cameronns advise and emailed xnet who were better than excellent [these guys are very good]

Firstly they confirmed they don't do any shaping or dare I say it rate limiting. They confirmed my adsl stats as being "excellent"

downstream noise margin 13.9 dB
upstream noise margin 24 dB
line rate downstream 7616 Kbps
attainable line rate downstream 8640 Kbps

They want me do do some testing outside the dreaded 4pm to midnight period that the dsl network is thrashed

This morning I tried with their test and got 2.6Mbit which shows I can get more than 2Mbit. As they suggest maybe my

neighbours  are downloading movies/bit torrenting etc

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