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.


6 posts

Wannabe Geek


Topic # 240871 30-Sep-2018 19:33
Send private message quote this post

I'm looking for some information on what rural ADSL stats should look like. I'm attaching modem stats for 2 different households that are similar distance (~2.4km) from the exchange (Waitati, Otago). Both use DSL filters rather than a central splitter. One connect suffers from regular disconnects (was running a Linksys WAG120N, testing now with an old Vodafone supplied HG556a) where the other seems to stay keep DSL sync, but has 60 seconds of no data (Spark supplied HG630b). I'm thinking the problem is with the SNR - but looking for any pointers. Both lines have huge numbers of errors at times. Wondering if nothing can be done about the line stats - is there a recommended modem for conditions like these?

 

Click to see full size

 

Click to see full size


Create new topic
5122 posts

Uber Geek
+1 received by user: 1648


  Reply # 2098902 30-Sep-2018 19:38
One person supports this post
Send private message quote this post

There is no problem with SNR - ddDLM sets it based on how stable the connection is - 6dB for a very stable connection, may go as high as 15dB for very very unstable, in 3dB steps.

 

That Spark connection is showing a very high error rate - very likely to be internal dwelling wiring if you are using plugin filter(s). Get a master splitter installed with a dedicated xDSL outlet to sort that.

 

Can;t see the errors on the other connection, but 37dB attenuation means a long line, or poor wiring - could be both. Again, cleaning up the internal wiring is the first step.


5122 posts

Uber Geek
+1 received by user: 1648


  Reply # 2098903 30-Sep-2018 19:45
Send private message quote this post

The other thing that could cause high FEC and cyclic loss of connection but retaining xDSL sync would be interference from an electric fence, probably running nearby and parallel to the phone line.


5122 posts

Uber Geek
+1 received by user: 1648


  Reply # 2098904 30-Sep-2018 19:47
Send private message quote this post

Also, check the firmware version of the 630b - these have been around a while, so may need updating. Details here https://www.geekzone.co.nz/forums.asp?forumid=39&topicid=230752


3621 posts

Uber Geek
+1 received by user: 2087

Trusted
Lifetime subscriber

  Reply # 2098907 30-Sep-2018 20:20
Send private message quote this post

@keppelk Are they Naked Broadband connections or clothed?

 

John





Ex JohnR VodafoneNZ 17 years 4 days



6 posts

Wannabe Geek


  Reply # 2098929 30-Sep-2018 21:05
Send private message quote this post

Thanks for the pointers.

 

Working on a firmware update from the HG630b. Currently running B021, so can upgrade to B023.... as soon as the admin password is remembered.... Currently using user/HuaweiUser which doesn't allow firmware upgrades. admin/admin doesn't work

 

There is an electric fence line parallel to the feed up the road. Have had this turned on and off for testing, and it doesn't seem to make much difference. Will try and get some more information about the error timeframe (clusters or random).

 

Internal wiring is in CAT5 at both places. Splitter will be easy in one, and very much not easy at the other.

 

Any ideas re a more error tolerant modem option?




6 posts

Wannabe Geek


  Reply # 2098953 30-Sep-2018 21:44
Send private message quote this post

@Linux - both clothed connections with active landlines


'That VDSL Cat'
8698 posts

Uber Geek
+1 received by user: 1882

Trusted
Spark
Subscriber

  Reply # 2098957 30-Sep-2018 21:55
One person supports this post
Send private message quote this post

I'm not convinced 60 seconds of NDT will be errors. Connection will fall over before that.

 

 

 

I'd check there is no upload sessions regularly running. 





#include <std_disclaimer>

 

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




6 posts

Wannabe Geek


  Reply # 2098996 30-Sep-2018 22:24
Send private message quote this post

So new firmware of the HG630b. Plenty of errors inside the first few minutes after connection: Click to see full size

 

Just noticed that the ADSL uptime on the old firmware was different on the front "Statistics" page and the "ADSL/VDSL" page. Maybe sync has been lost and I've been looking at the sync on the ADSL page. Will keep an eye on this on the new FW.

 

@hio77 - how do I check "there is no upload sessions regularly running"? Bulk of the internet traffic is on mobile devices and tablets at this place. No torrenting or anything like that.


681 posts

Ultimate Geek
+1 received by user: 222

Trusted
Spark NZ

  Reply # 2099011 30-Sep-2018 22:52
Send private message quote this post

With that amount of FEC (Forward Error Correction) going on I'd definitely call Spark and get a line test run on that line.

 

The fact that FEC is working so hard tells you that the data being sent down the ADSL line is being corrupted (between the Chorus exchange and your modem) - but there are many frames that the technology is able to recover the frame despite the corruption.  My assumption here is that CRC (Cyclic Redundancy Check) stats refer to CRC failures, and frame discards (due to how badly corrupted they are).

 

This has the hallmarks of some sort of line issue - impossible to tell at this stage if the fault is with your internal wiring, or out in the street. 

 

 

 

 





My views are my own, and may not necessarily represent those of my employer.

3621 posts

Uber Geek
+1 received by user: 2087

Trusted
Lifetime subscriber

  Reply # 2099013 30-Sep-2018 23:13
Send private message quote this post

keppelk:

@Linux - both clothed connections with active landlines



Time for a master splitter installed then

John




Ex JohnR VodafoneNZ 17 years 4 days

1523 posts

Uber Geek
+1 received by user: 580


  Reply # 2099174 1-Oct-2018 10:03
Send private message quote this post

keppelk:

 

@hio77 - how do I check "there is no upload sessions regularly running"? Bulk of the internet traffic is on mobile devices and tablets at this place. No torrenting or anything like that.

 

 

See if there's iCloud backup or similar running.


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.



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.