Geekzone: technology news, blogs, forums
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

19 posts


# 29447 7-Jan-2009 12:53
Send private message

I live in Auckland, in the area of Telecom's Onehunga exchange.  I have one of the original Xtra "Go Large" accounts - supposedly as fast as possible in both directions.

Results from a speed test done soon after we got ADSL:
Download 1412 kb/s
Upload 128 kb/s

Recently my ADSL connection speeds appear to be getting slower.  I also visited my brother-in-law's house, and their ADSL is 3-4x faster than ours (subjectively).

Following advice in these forums I contacted Telecom, and asked them to perform a line check.  These are the results I received:
Here are the test results you requested earlier
Your distance from the exchange is approximately 3.9kms

Cable Length: 3,910.9m (to locale: ON)
Copper Attenuation: 96 dB (to locale: ON)
Loop Resistance: 825.7 Ohms (to locale: ON)

Thank you for your inquiry

According to the attenuation result I should have a very poor ADSL connection indeed, but even though it is bad, it is not that bad!

Is this result somehow inaccurate?

The reason I am performing these investigations is that I am thinking of changing ISPs to someone else like Orcon for example, who apparently offer ADSL2+.  If I get this will I notice any speed improvement, given the distance our house is from the exchange?


Create new topic
776 posts

Ultimate Geek

Snap Internet

  # 188007 7-Jan-2009 13:44
Send private message

Thats probably the loop attenuation, not single direction attenuation (much more relevant in adsl).


0800 BROADBAND (276 232)

@SnapInternet on Twitter
Snap Internet on Facebook

Our Social Media Team:
^RO Ricky - Technical Lead
^AT Ashleigh - Retail Marketing Coordinator

2325 posts

Uber Geek

Lifetime subscriber

  # 188010 7-Jan-2009 13:48
Send private message

Maybe attenuation figure depends on frequency used. ADSL figure relates to 300 kHz.



Spark FibreMAX using Mikrotik CCR1009-8G-1S-1S+


Speed Test



239 posts

Master Geek


  # 188015 7-Jan-2009 14:09
Send private message

As Spyware pointed out the attenuation depends on frequency it's measured at. What is the attenuation figure displayed on your modem configuration page? I was quoted 85dB by Telecom when I first got broadband, while actual modem downstream attenuation was ~40dB.

1874 posts

Uber Geek


  # 188030 7-Jan-2009 15:22
Send private message

First of all Go Large isnt as fast as your line can go in both directions, upstream is capped at 128k (possibly 192 cant quite remember) and because of this and the way Adsl works your downstream will automaticaly be capped at 3.5mbit.

I have had problems with high Attenuation in the past, we rewired from the demarcation point to the jack and it decreased it somewhat, its now 69 Upstream and 52 Downstream, and i synch at 2281 Kbps.. It used to synch at ~400Kbps and be somewhere in the high 80's! So this is a vast improvement.

19 posts


  # 188046 7-Jan-2009 17:24
Send private message

This is the best I can achieve now...

635 posts

Ultimate Geek

  # 188055 7-Jan-2009 18:11
Send private message

Have you checked if you are in an area to be moved onto a cabinet (one with a DSLAM in it)?
Check by entering your address here:

If you are and it's going to happen soon, then you might be best to stay with Xtra.

In garvaini's post he mentioned rewiring... check this thread for more on ADSL connections speeds (if you haven't checked already).

If the limitation is in your house wiring or the Telecom cable back to the exchange, changing ISP probably won't help.

206 posts

Master Geek


  # 188096 7-Jan-2009 20:53
Send private message

Have a read of this thread.

If it's still worse than expected email with the ADSL line number, your Telecom account number and a description of the issue along with troubleshooting already performed.

As Alexx suggested, check here for information regarding the availability of ADSL2+ and projected cabinet installation dates.

Also, GoLarge is shaped aggresively which results in poor performance. Once your connect rates are sorted you'd fare better on a newer ADSL2+ plan as they're not at all restricted.

Please note: Any posts, comments, or contributions in this forum are posted by me as an individual acting in my own right and do not necessarily reflect the views of any company I work for, clients I've consulted for or anyone else.


194 posts

Master Geek


  # 188441 9-Jan-2009 19:02
Send private message

Just a note here about the results you got back

They don't measure them.

These are expected results.

Basically (at least last time I checked) they put your address into a spreadsheet that calculates it for you.

- Hone , Often accused of Excess Verbosity

206 posts

Master Geek


  # 188444 9-Jan-2009 19:09
Send private message

Yeah, it's a calculated value as opposed to a direct test result.
That said if the records are out of date (e.g. you've just moved or had some changes made to your exchange) the results may be inaccurate.

96dB is high, however it isn't an astounding figure. I've seen ADSL functioning (albeit not extremely fast) at 115dB on those line tests.
As for resistance it should be relatively reliable if the number returned is <1000ohms

Please note: Any posts, comments, or contributions in this forum are posted by me as an individual acting in my own right and do not necessarily reflect the views of any company I work for, clients I've consulted for or anyone else.

635 posts

Ultimate Geek

  # 188473 9-Jan-2009 21:21
Send private message

Even if 96db was the measured value at some frequency, it might be possible to have reasonable line performance at other frequencies and a working ADSL connection due to the Discrete Multi-Tone (DMT) modulation scheme used.

19 posts


# 188978 12-Jan-2009 13:57
Send private message

Here is another thread related to this one...

Create new topic

Switch your broadband provider now - compare prices

Twitter and LinkedIn »

Follow us to receive Twitter updates when new discussions are posted in our forums:

Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:

Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:

News »

Microsoft New Zealand Partner Awards results
Posted 18-Oct-2019 10:18

Logitech introduces new Made for Google keyboard and mouse devices
Posted 16-Oct-2019 13:36

MATTR launches to accelerate decentralised identity
Posted 16-Oct-2019 10:28

Vodafone X-Squad powers up for customers
Posted 16-Oct-2019 08:15

D Link ANZ launches EXO Smart Mesh Wi Fi Routers with McAfee protection
Posted 15-Oct-2019 11:31

Major Japanese retailer partners with smart New Zealand technology IMAGR
Posted 14-Oct-2019 10:29

Ola pioneers one-time passcode feature to fight rideshare fraud
Posted 14-Oct-2019 10:24

Spark Sport new home of NZC matches from 2020
Posted 10-Oct-2019 09:59

Meet Nola, Noel Leeming's new digital employee
Posted 4-Oct-2019 08:07

Registrations for Sprout Accelerator open for 2020 season
Posted 4-Oct-2019 08:02

Teletrac Navman welcomes AI tech leader Jens Meggers as new President
Posted 4-Oct-2019 07:41

Vodafone makes voice of 4G (VoLTE) official
Posted 4-Oct-2019 07:36

2degrees Reaches Milestone of 100,000 Broadband Customers
Posted 1-Oct-2019 09:17

Nokia 1 Plus available in New Zealand from 2nd October
Posted 30-Sep-2019 17:46

Ola integrates Apple Pay as payment method in New Zealand
Posted 25-Sep-2019 09:51

Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.