General Discussion
  >> General Broadband Chatter


Register (or login) on our website and you will not see this ad.


  Print Thread
Anonymous
(Unregistered)Wed 01-Aug-12 20:48:19
Print Post

Meaning of "Attainable Rate"?


[link to this post]
 
Hi,

My router stats look as follows (sorry about the formatting):


adsl status
--------------------------- ATU-R Info (hw: annex A, f/w: annex A) -----------
Running Mode : ADSL2+(G.992.5) State : SHOWTIME
DS Actual Rate : 6648972 bps US Actual Rate : 1063878 bps
DS Attainable Rate : 7876000 bps US Attainable Rate : 1064000 bps
DS Path Mode : Fast US Path Mode : Fast
DS Interleave Depth : 1 US Interleave Depth : 1
NE Current Attenuation : 42 dB Cur SNR Margin : 8 dB
DS actual PSD : 19. 0 dB US actual PSD : 12. 8 dB
ADSL Firmware Version : 232201_A
-------------------------------- ATU-C Info ---------------------------------
Far Current Attenuation : 18 dB Far SNR Margin : 9 dB
CO ITU Version[0] : 00004946 CO ITU Version[1] : 0000544e
DSLAM CHIPSET VENDOR : < IFTN >


Can anyone help with explaining what the "DS Attainable Rate" and "US Attainable Rate" are governed by? Obviously they're DownStream and UpStream but how are they determined?

Thanks,

Tom
Standard User Andrue
(knowledge is power) Wed 01-Aug-12 21:11:05
Print Post

Re: Meaning of "Attainable Rate"?


[re: Anonymous] [link to this post]
 
As I understand it 'attainable rate' means the rate the modem could connect at if it were allowed. A bit like saying the attainable speed of my Honda Jazz is 105mph. In practice road conditions and most especially the Police prevent me reaching that. The only thing I find a bit puzzling in your case is why your actual rate is so far below the attainable when both are below 80Mb/s. It probably relates to the BT profiling and/or DLM. For some reason the modem isn't being allowed to reach its full potential.

Doesn't look abnormal though - just a little sub optimal. Perhaps your line is a bit noisy.

---
Andrue Cope
Brackley, UK

Just because he could. RIP.
Standard User RobertoS
(sensei) Wed 01-Aug-12 22:25:03
Print Post

Re: Meaning of "Attainable Rate"?


[re: Andrue] [link to this post]
 
The noise margin also affects it. I don't know what the Attainable rate calculation assumes for that. It's also quite common on ADSLx, and I find even more so on VDSL2, for the actual to be higher than the "maximum".

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - Plusnet Value Fibre FTTC 80/20 trial.

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


Register (or login) on our website and you will not see this ad.

Standard User XRaySpeX
(eat-sleep-adslguide) Thu 02-Aug-12 00:14:00
Print Post

Re: Meaning of "Attainable Rate"?


[re: Andrue] [link to this post]
 
In reply to a post by Andrue:
The only thing I find a bit puzzling in your case is why your actual rate is so far below the attainable when both are below 80Mb/s
OP''s on ADSL2+ not VADS!. He's syncing at < 8 Meg.

1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC
Administrator MrSaffron
(staff) Thu 02-Aug-12 09:00:09
Print Post

Re: Meaning of "Attainable Rate"?


[re: Anonymous] [link to this post]
 
With an 8dB margin you are getting the actual. The attainable will be what is possible is you used a lower target noise margin generally. Of course if noise is such that the line becomes unstable, there is little point in pushing the extra sync

42dB attenuation on ADSL2+ you are a little slow, but not massively so.

Andrew Ferguson, andrew@thinkbroadband.com
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 Andrue
(knowledge is power) Thu 02-Aug-12 13:04:48
Print Post

Re: Meaning of "Attainable Rate"?


[re: XRaySpeX] [link to this post]
 
In reply to a post by XRaySpeX:
In reply to a post by Andrue:
The only thing I find a bit puzzling in your case is why your actual rate is so far below the attainable when both are below 80Mb/s
OP''s on ADSL2+ not VADS!. He's syncing at < 8 Meg.
Oops, yeah I wasn't in the forum I thought I was.

---
Andrue Cope
Brackley, UK

Just because he could. RIP.
Standard User XRaySpeX
(eat-sleep-adslguide) Thu 02-Aug-12 13:15:59
Print Post

Re: Meaning of "Attainable Rate"?


[re: Andrue] [link to this post]
 
There's a lot of that about grin

1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC
Anonymous
(Unregistered)Thu 02-Aug-12 19:14:09
Print Post

Re: Meaning of "Attainable Rate"?


[re: XRaySpeX] [link to this post]
 
Thanks Everyone.

Very useful - I has wondered if it had referred to an ISP or Network-set limit (banding) but it sounds like it's a Draytek set guess based on what the sync could be if the noise was lower.

Cheers

Tom
Standard User XRaySpeX
(eat-sleep-adslguide) Thu 02-Aug-12 20:49:48
Print Post

Re: Meaning of "Attainable Rate"?


[re: Anonymous] [link to this post]
 
In reply to a post by Anonymous:
what the sync could be if the noise was lower.
If the noise were lower it would go like the clappers grin

No, it's if the target Noise Margin were lower.

1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC
Standard User tommy45
(knowledge is power) Thu 02-Aug-12 21:28:40
Print Post

Re: Meaning of "Attainable Rate"?


[re: XRaySpeX] [link to this post]
 
In reply to a post by XRaySpeX:
In reply to a post by Anonymous:
what the sync could be if the noise was lower.
If the noise were lower it would go like the clappers grin

No, it's if the target Noise Margin were lower.
theoretically yes, but how many lines would sync with the target noise margin set at 0db ? never mind hold a sync with a 0 db margin for any period of time
But the theoretical attainable rate also increases or decreases according to what the margin is showing , mine at now is saying 194.500 kbps attainable, it fluctuates all the time, i think the highest Ive seen is around the 21000kbps mark and that was last summer

Edited by tommy45 (Thu 02-Aug-12 21:31:28)

  Print Thread

Jump to