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1387 posts

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  # 1421775 5-Nov-2015 16:23
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Theclaytons: What determines 17a vs 8b?


heavy voodoo.  no-one really knows for sure.  some say a low attenuation, but it seems to be more complicated than that.  the old rule of thumb seemed to suggest if you had great (50 megabit+) then you had a good chance.  but there were people with 50 megabit syncs still on 8b before.  now a rule of thumb may be if you get 70 megabit on 8b there's a good chance.  


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  # 1421777 5-Nov-2015 16:24
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lol

I'm guessing that 850m is probably pushing the envelope for 17a :)

 
 
 
 


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  # 1421778 5-Nov-2015 16:25
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Theclaytons: lol

I'm guessing that 850m is probably pushing the envelope for 17a :)


unfortunately yes, the best hope for 850m is that chorus start allowing 6db snr dlm profiles for stable lines.


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  # 1421779 5-Nov-2015 16:26
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sorry for ignorant question, what would that enable? faster sync?

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  # 1421782 5-Nov-2015 16:28
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yes lower SNR generally means higher sync speeds

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  # 1421809 5-Nov-2015 16:31
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i think i may of switched to the new bandplans, but i lost nearly 4mbit on the upload side.




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  # 1421813 5-Nov-2015 16:34
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Theclaytons: sorry for ignorant question, what would that enable? faster sync?


if you look with a program like dslstats, most frequences are usually around 40 to 50db snr on a decent line (less on a worse line) and snr margin is the number of db taken out of the available spectrum to deal with any drops in snr.  so 3db would only allow a 3db drop, while 12db allows a 12db drop.  lots of people are syncing at 7db - the profile only specifies are low as 9db, but there's an extra 2db of noise that happens while everyone is active.  so if you were on a 3db profile you could easily have instability.  with dlm being automatic, if snr margin is only dropping on stable lines it wouldn't be so bad.  if you sync during active time you'll have a higher snr margin too with slower downlaod speed.


 
 
 
 


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  # 1421817 5-Nov-2015 16:37
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I'm sure this has been covered before but I'll give a very simplistic view.

The previous (997) bandplan allows(ed) more symmetric up and down sync speeds than the new 998 Bandplan.

However, until now the upload was capped at 10Mbps artificially.

With the new 998 bandplan, we are moving to a LESS symmetric system (biased toward better download and worse upload than 997), BUT at the same time, the artificial 10Mbps upload limit has been removed. (I don't know if the new 30 or 50 upload limit is artificial - I personally don't care)

This means that many people will see an upload speed increase because of the removal of the artificial 10Mbps limit.

People with an old (997) based upload of under the 10Mbps limit (or right at it), will likely see a small decrease in upload.

Clear as mud?

Cheers - N





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Please note all comments are the product of my own brain and don't necessarily represent the position or opinions of my employer, previous employers, colleagues, friends or pets.


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  # 1421825 5-Nov-2015 16:43
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Talkiet: I'm sure this has been covered before but I'll give a very simplistic view.

The previous (997) bandplan allows(ed) more symmetric up and down sync speeds than the new 998 Bandplan.

However, until now the upload was capped at 10Mbps artificially.

With the new 998 bandplan, we are moving to a LESS symmetric system (biased toward better download and worse upload than 997), BUT at the same time, the artificial 10Mbps upload limit has been removed. (I don't know if the new 30 or 50 upload limit is artificial - I personally don't care)

This means that many people will see an upload speed increase because of the removal of the artificial 10Mbps limit.

People with an old (997) based upload of under the 10Mbps limit (or right at it), will likely see a small decrease in upload.

Clear as mud?

Cheers - N



But to confirm, the maximum download will still be 70Mbps?


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  # 1421830 5-Nov-2015 16:45
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networkn: [snip]

But to confirm, the maximum download will still be 70Mbps?



Or 100 :-) Depending on chipset. No. I don't know how to find out what you are connected to... Some routers might expose the info, I'm not sure.

Cheers - N





--

 

Please note all comments are the product of my own brain and don't necessarily represent the position or opinions of my employer, previous employers, colleagues, friends or pets.


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  # 1421833 5-Nov-2015 16:50
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Talkiet:
networkn: [snip]

But to confirm, the maximum download will still be 70Mbps?



Or 100 :-) Depending on chipset. No. I don't know how to find out what you are connected to... Some routers might expose the info, I'm not sure.

Cheers - N



adsl info --vendor on broadcom with telnet (or xdslcmd and ssh with hg659)



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  # 1421844 5-Nov-2015 17:15
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So if my already hopeless 4 meg upstream drops even furthur with the change, would that then count as a fault as far as chorus is concerned or would I risk the $150 for a rude tech turning up and doing nothing but BSing like my flatmate had?




Richard rich.ms

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  # 1421845 5-Nov-2015 17:17
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richms: So if my already hopeless 4 meg upstream drops even furthur with the change, would that then count as a fault as far as chorus is concerned or would I risk the $150 for a rude tech turning up and doing nothing but BSing like my flatmate had?


it may not drop further, ... there seems to be a shift to 9db snr margin at the same time, and there's the addition of a little bit of spectrum right at the start of the frequency table.

i think 15/5 was the target originally?  but best you can do is probably shift back to adsl which is still worse.  i wouldn't worry about it until it happens.  but if you really care about upload speed you could always try getting a second vdsl line and see if the line is cleaner.


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  # 1421846 5-Nov-2015 17:22
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I already have 2. The second one is 21/10 as was the flatmates until one day it mysteriously dropped to 15/4ish




Richard rich.ms

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  # 1421847 5-Nov-2015 17:23
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richms: I already have 2. The second one is 21/10 as was the flatmates until one day it mysteriously dropped to 15/4ish


you could always try raising a fault.  if you make heavy use of upload that'd be annoying :)


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