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Standard User RobertoS
(sensei) Sun 15-Sep-13 20:19:29
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Re: Interleaving on ADSL Max


[re: 4M2] [link to this post]
 
In reply to a post by 4M2:
Returning to the Forward Error Correction/interleaving topic: are FEC errors reported by a router an indication of interleaving depth?
Too deep for me, that. Basically the greater the interleaving depth, the more uncorrected errors would become "corrected", but latency would increase.

Up to the point where the remaining errors are uncorrectable.

My broadband basic info/help site - www.robertos.me.uk | Domains,website and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 51.8/16.8Mbps @ 600m. - BQM

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
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Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.
Standard User yarwell
(sensei) Mon 16-Sep-13 19:52:11
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Re: Interleaving on ADSL Max


[re: 4M2] [link to this post]
 
the bandwidth for the extra data (for the error correction) has to come from somewhere I guess.

--

Phil

MaxDSL - goes as fast as it can and doesn't read the line checker first.

MaxDSL diagnostics
Standard User RobertoS
(sensei) Mon 16-Sep-13 23:26:42
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Re: Interleaving on ADSL Max


[re: yarwell] [link to this post]
 
Tut Phil! That's nothing to do with the sync speed, merely the way the bits are used. And as the whole point of interleaving is to increase the throughput for a given sync, by reducing the number of retransmissions required ....

My broadband basic info/help site - www.robertos.me.uk | Domains,website and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 51.8/16.8Mbps @ 600m. - BQM

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.


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Standard User yarwell
(sensei) Thu 19-Sep-13 07:35:01
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Re: Interleaving on ADSL Max


[re: RobertoS] [link to this post]
 
Tut Phil! That's nothing to do with the sync speed, merely the way the bits are used.
But why does 8128 fast path often drop to 7616 interleaved ?

--

Phil

MaxDSL - goes as fast as it can and doesn't read the line checker first.

MaxDSL diagnostics
Standard User RobertoS
(sensei) Thu 19-Sep-13 11:51:50
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Re: Interleaving on ADSL Max


[re: yarwell] [link to this post]
 
Don't forget with there is a setting that allows the full 8128 on interleaved, given appropriate hardware and firmware. Just that most combinations don't have that setting available in both parts.

We may as well ask why ADSL Max has a maximum sync of 8128kbps, not 8192kbps.

In fact it was frequently reported that on O2/Be, interleaving could increase sync. Presumably because it was applied at (real) training time and reduced the error rates, so allowing a higher speed to be negotiated.

My broadband basic info/help site - www.robertos.me.uk | Domains,website and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 51.8/16.8Mbps @ 600m. - BQM

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.

Edited by RobertoS (Thu 19-Sep-13 12:05:19)

Standard User adslmax
(knowledge is power) Thu 19-Sep-13 12:56:51
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Re: Interleaving on ADSL Max


[re: RobertoS] [link to this post]
 
BT could easily put 8888K on it. (instead of 8128K or 8192K) but it alway's will be 8128K or 7616K (with interleaved)

plusnetADSL2+15.7 Meg
Standard User 4M2
(knowledge is power) Thu 19-Sep-13 13:18:48
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Re: Interleaving on ADSL Max


[re: adslmax] [link to this post]
 
In reply to a post by adslmax:
BT could easily put 8888K on it. (instead of 8128K or 8192K) but it alway's will be 8128K or 7616K (with interleaved)


Perhaps the IP Profiling system on G.DMT will only work on speeds up to 8128Kbps and there wouldn't be any advantage in having a faster downstream sync speed?
Standard User adslmax
(knowledge is power) Thu 19-Sep-13 14:40:52
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Re: Interleaving on ADSL Max


[re: 4M2] [link to this post]
 
In reply to a post by 4M2:
In reply to a post by adslmax:
BT could easily put 8888K on it. (instead of 8128K or 8192K) but it alway's will be 8128K or 7616K (with interleaved)


Perhaps the IP Profiling system on G.DMT will only work on speeds up to 8128Kbps and there wouldn't be any advantage in having a faster downstream sync speed?


BT can increasing IP Profile no problem. But, they wouldn't do it. They put a cap on 7150K out of 8128K.

plusnetADSL2+15.7 Meg
Administrator MrSaffron
(staff) Thu 19-Sep-13 14:44:18
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Re: Interleaving on ADSL Max


[re: adslmax] [link to this post]
 
Explain?

Or do the ATM to IP overheads not mean anything?

Andrew Ferguson, [email protected]
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User 4M2
(knowledge is power) Thu 19-Sep-13 14:51:28
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Re: Interleaving on ADSL Max


[re: MrSaffron] [link to this post]
 
Is the IP Profile a means of limiting throughput speed also - no point in allocating a 8128Kbps bandwidth to a line that can not handle that speed, so perhaps, in a sense, the IP Profile is a cap?
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