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


res



13 posts

Geek


# 247747 20-Feb-2019 15:13
Send private message

Hi,I live in a rural site some 4.5 k away from the DSLAM in the nearby Wairarapa town.  No surprises we are stuck on ADSL, even fixed wireless doesn't look like a runner.

 

That said, I've installed the in-wall splitter, and placed my ADSL modem (Tecnicolor TG789vn v3 on generic firmware) close to it.  In this config, it consistently connects at around 8.5Mb/s down and 1.1Mb/s up, and clearly the speed is negotiated to achieve a 6dB noise margin both down and up.  I use this modem as it has a Broadcom chipset matching the DSLAM, plus it gives near real-time display of speed and noise margins.

 

Last December things went strange.  Speeds sagged to <7 down and about 0.9 up, with a massive 12dB noise margin down and up, no matter how many times I reconnected.  I listened to the fixed phone, no funny sounds on the line or significant new electric fence ticks.  I swapped in an older TG585v8 and it connected at the same speeds/margins. So, not the line, not the modem?

 

A week later nothing had changed and I was thinking I'd need to call Spark faults and somehow ????? get the person on the other end to understand the issue.  I could not see that ending well.  Someone talking noise margins to their under resourced, under paid, limited training help desk?

 

Then I again looked at where my connect speeds were.  They had improved!  Clearly we were now negotiating for an 8dB margin up and down.  A few days later and we were back to normal speeds and 6dB margins.  This was weird, but OK things were normal again......

 

Come Feb 2019 and the up speed only has dropped, it is negotiating a 12dB margin, while the down speed is fine still targeting 6dB.  As of the last week or so, we've been steady with down normal, up still a little low and now 8dB margin.

 

Does anyone have any idea what Chorus (I assume) are doing?  Is someone tinkering with DLAM settings?  Doing DSLAM software upgrades?Any other suggestions for diagnosing this?

 

Thanks for any ideas/info

 

RES


Create new topic
732 posts

Ultimate Geek


  # 2184399 20-Feb-2019 15:15
Send private message

Sounds like ddDLM doing it's thing - possibly there is a small line issue somewhere. Have these changes coincided with a lot of rain or anything like that?

 


Have you tried a new/different modem for a few weeks to see if it will stabilize at the lower SNR margin? Wouldn't surprise me if that modem was the issue. 


'That VDSL Cat'
11168 posts

Uber Geek

Trusted
Spark
Subscriber

  # 2184410 20-Feb-2019 15:38
Send private message

This is absolutely ddDLM doing it's thing.

 

 

 

it will adjust line profile in order to balance stability and speed.

 

If your rebooting your modem tons, that would encourage it to suspect your line is faulty.





#include <std_disclaimer>

 

Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.


 
 
 
 


'That VDSL Cat'
11168 posts

Uber Geek

Trusted
Spark
Subscriber

  # 2184412 20-Feb-2019 15:39
Send private message

Most of the DSLAM's there are vectoring enabled too, so your better off on a modem that supports G.INP and Vectoring

 

 





#include <std_disclaimer>

 

Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.


5595 posts

Uber Geek


  # 2184442 20-Feb-2019 16:51
One person supports this post
Send private message

res:[snip]Last December things went strange.  Speeds sagged to <7 down and about 0.9 up, with a massive 12dB noise margin down and up, no matter how many times I reconnected. 

 

 

Every time you reconnect, ddDLM thinks there is a problem with the line. It sees all the disconnections, and increases the noise margin to try and get stability on the line. Best not to disconnect unless you really have to.


1957 posts

Uber Geek

Trusted
Subscriber

  # 2184449 20-Feb-2019 16:58
One person supports this post
Send private message

or better yet, why don't you call Spark and _not_ presume that the other end will be staffed by someone who cant help. Yes you need to go through front line help desk, but if you keep it simple and straightforward - "my internet was very fast before xmas but now is getting slower and slower", they will escalate to tech support desk, and they can open an investigation case for you using what you do know.

 

 

 

It's interesting that the default listening for ISPs is they are all incapable of helping, before being proved incompetent.





________

 

Antonios K

 

Click to see full size


res



13 posts

Geek


  # 2184470 20-Feb-2019 17:59
Send private message

antoniosk:

 

or better yet, why don't you call Spark and _not_ presume that the other end will be staffed by someone who cant help. Yes you need to go through front line help desk, but if you keep it simple and straightforward - "my internet was very fast before xmas but now is getting slower and slower", they will escalate to tech support desk, and they can open an investigation case for you using what you do know.

 

 

 

It's interesting that the default listening for ISPs is they are all incapable of helping, before being proved incompetent.

 

 

 

 

Don't want to be rude - but have you actually tried your own medicine?  Ok it's been a couple of years since I last did, but based on that and the previous times, seriously, THEY ARE CRAP.

 

 

 

Thanks everyone for your ideas.  May start looking for a new modem.  But vectoring isn't used on ADSL is it, only VDSL?

 

 


'That VDSL Cat'
11168 posts

Uber Geek

Trusted
Spark
Subscriber

  # 2184486 20-Feb-2019 18:33
Send private message

Your right on vectoring. I've got a lot on lately and slipped what tech your on.

ADSL still has dddlm working on it.


As someone who builds the assure systems I can say we have plenty of great experiences.
I won't deny that the occasional case can go wrong, but we are all human.
A few years ago things were very much legacy. Tons of improvements and even means that do not require you to call.




#include <std_disclaimer>

 

Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.


 
 
 
 


838 posts

Ultimate Geek

Trusted

  # 2184489 20-Feb-2019 18:42
2 people support this post
Send private message

res:

 

antoniosk:

 

or better yet, why don't you call Spark and _not_ presume that the other end will be staffed by someone who cant help. Yes you need to go through front line help desk, but if you keep it simple and straightforward - "my internet was very fast before xmas but now is getting slower and slower", they will escalate to tech support desk, and they can open an investigation case for you using what you do know.

 

 

 

It's interesting that the default listening for ISPs is they are all incapable of helping, before being proved incompetent.

 

 

 

 

Don't want to be rude - but have you actually tried your own medicine?  Ok it's been a couple of years since I last did, but based on that and the previous times, seriously, THEY ARE CRAP.

 

 

 

Thanks everyone for your ideas.  May start looking for a new modem.  But vectoring isn't used on ADSL is it, only VDSL?

 

 

 

 

Most of the ISPs have smart people nestled away, and they're there to help. It might feel like the help desk isn't there to help, but they're there to filter the "OH I WAS PLUGGED INTO THE WRONG HOLE IN THE FILTER?" from the "Yeah, it DOES seem like you've got a weird issue with DHCP, I guess we'll send out a new router out".





Anything I say is the ramblings of an ill informed, opinionated so-and-so, and not representative of any of my past, present or future employers, and is also probably best disregarded.


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 »

Spark launches new wireless broadband "Unplan Metro"
Posted 11-Nov-2019 08:19


Malwarebytes overhauls flagship product with new UI, faster engine and lighter footprint
Posted 6-Nov-2019 11:48


CarbonClick launches into Digital Marketplaces
Posted 6-Nov-2019 11:42


Kordia offers Microsoft Azure Peering Service
Posted 6-Nov-2019 11:41


Spark 5G live on Auckland Harbour for Emirates Team New Zealand
Posted 4-Nov-2019 17:30


BNZ and Vodafone partner to boost NZ Tech for SME
Posted 31-Oct-2019 17:14


Nokia 7.2 available in New Zealand
Posted 31-Oct-2019 16:24


2talk launches Microsoft Teams Direct Routing product
Posted 29-Oct-2019 10:35


New Breast Cancer Foundation app puts power in Kiwi women's hands
Posted 25-Oct-2019 16:13


OPPO Reno2 Series lands, alongside hybrid noise-cancelling Wireless Headphones
Posted 24-Oct-2019 15:32


Waikato Data Scientists awarded $13 million from the Government
Posted 24-Oct-2019 15:27


D-Link launches Wave 2 Unified Access Points
Posted 24-Oct-2019 15:07


LG Electronics begins distributing the G8X THINQ
Posted 24-Oct-2019 10:58


Arlo unveils its first video doorbell
Posted 21-Oct-2019 08:27


New Zealand students shortlisted for James Dyson Award
Posted 21-Oct-2019 08:18



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.