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

5 posts

Wannabe Geek

Topic # 114752 1-Mar-2013 17:40
Send private message

I've been a long time periodic lurker on these forums, although I live in AU these days.

Before I left, I set up my in-laws with a Billion 5100 on a semi-rural line.  They use TelstraClear - although I'm unsure whether they are ULL or wholesale.

The router's log shows a typical sync as:

01/01/1970 00:00:17> Modulation: G.dmt
01/01/1970 00:00:17> Annex Mode: ANNEX_A
01/01/1970 00:00:17> Max Tx Power: -38dBm/Hz
01/01/1970 00:00:17> CO Vendor: N/A
01/01/1970 00:00:17> d/s SNR: 12.4dB, u/s SNR: 15.0dB
01/01/1970 00:00:17> d/s Attenuation: 39.8dB, u/s Attenuation: 19.0dB
01/01/1970 00:00:17> d/s Data Rate: 5984kbps, u/s Data Rate: 896kbps

Nothing too special.

Now, as this router is almost 10 years old, I was planning to replace it when I come back to visit shortly, both to get them a better sync and to prevent uPNP weirdness that likes a reboot every couple of weeks.

All the talk on Whirlpool seems to lean towards matching ADSL chipsets with the ports used at the Telco, as well as some chipsets working better on poor SNR lines, and others working better over short distances etc.

Has anyone got any advice on chipsets in NZ, especially regarding specific chipsets that you've found to work well on lower-quality/long run lines?

Create new topic
8027 posts

Uber Geek
+1 received by user: 387


  Reply # 773672 2-Mar-2013 17:33
Send private message

It's most likely Chorus DSL equipment with Broadcom line card if it's rural. Chorus use Ikanos line cards in new deployments.

Broadcom chipset works great on either.

Can't remember what vendor Telstraclear were using for their LLU, doesn't look like a LLU connection though as it wouldn't be G.dmt/ADSL1 and most LLU uses more aggressive noise margin than Chorus does (eg: 9dB or 6dB instead of 12 dB). 

Check the address in to see what exchange/cabinet they are connected to and whether ADSL2+ is available.

Also might as well install a master filter/splitter while you are there to isolate the DSL line from the undoubtedly daisy chained internal phone wiring. Could be getting more line rate even on ADSL1 (G.dmt) with 40dB attenuation.

5 posts

Wannabe Geek

  Reply # 773864 3-Mar-2013 13:09
Send private message

Awesome reply, thanks.

From what you're saying, Broadcom seems to be the way to go.  I've checked their address in the tool and they're well outside any ADSL2+ coverage.  This leads me to agree that they are more than likely on a (Broadcom) Chorus DSL port.
I've got a TG585v7 based on a BCM6338 which I can give them or I can pick up a TD-W8950N (unknown BCM chipset) fairly cheaply too.

I've not done a master splitter install before, and I probably don't want to start now.  I could look in to getting an installer to come out though, assuming they're still $150-200.

What do you estimate would be achievable goal on a G.Dmt line at 40dB attenuation?


6369 posts

Uber Geek
+1 received by user: 319


  Reply # 773883 3-Mar-2013 14:06
Send private message

Hi, at 40dB expect around 4-6Mb/s, about 4yrs back in Waikanae I was sitting on 43dB and with a master filter and correct wiring sat on 4.6-5Mb/s. That said YMMV depending on how many other DSL services are in the feeder your on and what size that feeder is.


Create new topic

Twitter »

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:

Geekzone Live »

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

Geekzone Live »

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.