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# 175668 7-Jul-2015 18:58
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given that chorus are dynamically setting profiles, is there any reason that there isn't 12a/12b as well as 17a/8b?  it seems to be that it'd go a way with reaching better speeds for a lot of users.

even better if they can stop limiting upload speeds so aggressively.  so something like 17a for short lines, 12a(12b?) for medium, 8b for long.

unfortunately because i'm on 8b i can't see what snr is - but it's staying high right to the end of 8b with lowered transmit power like 17a/12a.  (well 42db, high enough..) so i figure it should go at least close to a significant drop off?  and it's not much higher at adsl frequencies than that - jumping up just before adsl frequencies are finishing... (tone 509)


12a wouldn't improve download speeds so much as improving upload speeds.  which means that users in areas that don't get fibre anytime soon could get 20 megabit up or such easily if chorus uncapped.

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  # 1338825 7-Jul-2015 18:58
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Hello... Our robot found some keywords in your post, so here is an automated reply with some important things to note regarding broadband speeds.

 



 

If you are posting regarding DSL speeds please check that

 



 

- you have reset your modem and router

 


 

- your PC (or other PCs in your LAN) is not downloading large files when you are testing

 

- you are not being throttled by your ISP due to going over the monthly cap

 


 

- your tests are always done on an ethernet connection to the router - do not use wireless for testing

 


 

- you read this topic and follow the instructions there.

 



 

Make sure you provide information for other users to help you. If you have not already done it, please EDIT your post and add this now:

 



 

- Your ISP and plan

 


 

- Type of connection (ADSL, ADSL2, VDSL)

 


 

- Your modem DSL stats (do not worry about posting Speedtest, we need sync rate, attenuation and noise margin)

 


 

- Your general location (or street)

 


 

- If you are rural or urban

 


 

- If you know your connection is to an exchange, cabinet or conklin

 


 

- If your connection is to a ULL or wholesale service

 


 

- If you have done an isolation test as per the link above

 



 

Most of the problems with speed are likely to be related to internal wiring issues. Read this discussion to find out more about this. Your ISP is not intentionally slowing you down today (unless you are on a managed plan). Also if this is the school holidays it's likely you will notice slower than usual speed due to more users online.

 



 

A master splitter is required for VDSL2 and in most cases will improve speeds on DSL connections. Regular disconnections can be a monitored alarm or a set top box trying to connect. If there's an alarm connected to your line even if you don't have an alarm contract it may still try to connect so it's worth checking.

 



 

I recommend you read these two blog posts:

 



 

- Is your premises phone wiring impacting your broadband performance? (very technical)

 


 

- Are you receiving a substandard ULL ADSL2+ connection from your ISP?




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  # 1338839 7-Jul-2015 19:08
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Quality / Age of the copper is part of the issue this has been spoken about in a few threads already

 
 
 
 




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  # 1338841 7-Jul-2015 19:09
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johnr: Quality / Age of the copper is part of the issue


that's what's been said various times, but cat3 can run 100 megabit fine often in practice even if cat5 is recommended.  the main concern seems to be crosstalk, but with the current capping to 70 megabit etc then 12a shouldn't impact 17a profiles that much etc.  with all of the error correction, dynamic management of tones etc it's lower risk than 100 megabit ethernet over cat3 surely?

also even in areas where copper quality is bad connections often sync way better after power outages with snr and work fine.  snr is another artifical cap which matters especially 6+km from exchange on extra-thin cable.  although cabinets make things a LOT better :)




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  # 1338842 7-Jul-2015 19:13
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The copper that runs up and down the streets is the issue not from the road to the house

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  # 1338843 7-Jul-2015 19:13
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Chorus are removing the upload restrictions when they move from 997 to 998



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  # 1338844 7-Jul-2015 19:14
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johnr: The copper that runs up and down the streets is the issue not from the road to the house


isn't that just about finding a good pair though?  



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  # 1338845 7-Jul-2015 19:14
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sbiddle: Chorus are removing the upload restrictions when they move from 997 to 998


any idea if they'll add 12a, 6db snr margin etc type profiles?  and is there any way to get in as a test user on this? :)


 
 
 
 


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  # 1338846 7-Jul-2015 19:15
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mercutio:
johnr: The copper that runs up and down the streets is the issue not from the road to the house


isn't that just about finding a good pair though?  


So how do all customers get a good pair?



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  # 1338848 7-Jul-2015 19:16
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johnr:
mercutio:
johnr: The copper that runs up and down the streets is the issue not from the road to the house


isn't that just about finding a good pair though?  


So how do all customers get a good pair?


well most areas have like twice as many as needed?  i suppose it just means they test each pair until they find one that's good.


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  # 1338850 7-Jul-2015 19:21
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Who pays for the time for a best effort service and what happens if they can't find a good pair?



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  # 1338851 7-Jul-2015 19:21
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this is where i found some good information on the various vdsl profiles btw:

http://yadda.icm.edu.pl/yadda/element/bwmeta1.element.baztech-article-BATA-0019-0023/c/Heliotis.pdf





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  # 1338852 7-Jul-2015 19:22
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johnr: Who pays for the time for a best effort service and what happens if they can't find a good pair?


well they have to anyway for adsl?  a lot of the worst areas for copper are also the areas that aren't getting ufb... so the problem isn't going away.

like for instance laingholm has pretty bad copper, and used to go all the way back to titirangi... so with cabinets it's like 1 or 2km ... but they still have pretty iffy copper, and is an area where a lot of people like to work from home and out of ufb area.

most of the destined for ufb areas have cabinets a lot closer though.  and so things like 12a could still work well there.  and give 20 megabit upload etc.


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  # 1338859 7-Jul-2015 19:30
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in theory, 12a/b profiles would be a good idea to lower crosstalk a tad.

but i doubt it would happen.

ild love to see G.INP/G998.4 put into use too however... Probably would never happen aswell.




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  # 1338861 7-Jul-2015 19:31
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It's still a best effort service / speed line can handle clearly they are going to replace the copper lines

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  # 1340167 9-Jul-2015 19:03
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johnr: It's still a best effort service / speed line can handle clearly they are going to replace the copper lines


Bit of a shame payment for the "Best Effort Service" is not best effort also.........




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