ADSL to ADSL2
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- Re: ADSL to ADSL2
ADSL to ADSL2
31-05-2014 5:35 PM
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Currently my account is set to ADSL1, my exchange supports ADSL2.
Please move me over to ADSL2, I understand it won't necessarily increase speed.
Thanks
Re: ADSL to ADSL2
31-05-2014 5:41 PM
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If you carry out the BT speedtest - further diagnostics what are the results
Can you post your router stats as it is possible that you are on ADSL1 because of line line
Re: ADSL to ADSL2
31-05-2014 6:25 PM
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If your line is provisioned as ADSL2+, if necessary you can then choose ADSL2+, ADSL2 or ADSL1 by configuring your modem/router accordingly.
I did find a possible source for the "ADSL2+ no benefit" claim:
Quote from: https ADSL1 or upto 8Mbps on longer lines may offer the optimum service when compared with ADSL2+ upto 20Mbps, under certain conditions (Lines over 4Km's/40dB) there may not be potentially a performance gain by upgrading to ADSL2+
I have never seen any valid explanation for that. Also, according to kitz's max speed calc, 40dB line attenuation is about 2.9km, 4km is more like 55dB.
Re: ADSL to ADSL2
31-05-2014 7:35 PM
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I'm interested to see how my 52dB line performs with ADSL2/ADSL2+.
Re: ADSL to ADSL2
31-05-2014 8:36 PM
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http://www.speedtest.btwholesale.com/PerformanceTesterWS/diagnostics.do
jelv (a.k.a Spoon Whittler) Why I have left Plusnet (warning: long post!) Broadband: Andrews & Arnold Home::1 (FTTC 80/20) Line rental: Pulse 8 Home Line Rental (£14.40/month) Mobile: iD mobile (£4/month) |
Re: ADSL to ADSL2
31-05-2014 9:15 PM
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Quote from: ejs
I have never seen any valid explanation for that. Also, according to kitz's max speed calc, 40dB line attenuation is about 2.9km, 4km is more like 55dB.
On long lines the higher frequencies as used by the full ADSL2+ service deteriorate into just 'noise'.
The attenuation of a signal at at specific frequency is much higher as the frequency used is increased
So the presence on the line of this junk/noise actually makes the line performance worse
Such lines benefit for deliberately restricting the ADSL output from the the DSALM to ADSL1/2 and not having the ADSL2+ "extra" part also there.
Re: ADSL to ADSL2
31-05-2014 11:32 PM
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Re: ADSL to ADSL2
01-06-2014 9:31 AM
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So while the router makes the decision that it cannot understand the data on say any specific frequency and allocates zero bit loading to it, the Dslam is still pumping it out.
By the time the BB signal has reach this sample long line those higher frequencies will have just become wideband 'general noise' across the entire frequency spectrum - making a general mess of the line's performance.
If you set the router to only work say on ADSL1 on a long line it will simply ignore the higher frequencies components of the signal and stop at the max ADSL1 frequency when analyzing the line at sync - above which in our example are unintelligible anyway - but you have to get the ISP to set the line to ADSL1 at their end if you want the DSLAM to stop sending out the higher frequencies in the first place.
From what I've seen/heard the main effect of removing the unused higher frequencies from a long line and restricting to either ADSL1 or plain 2 seems to be on stability rather than achieved sync level. As a guess I'd say that the general mush of the disturbing ADSL2+ higher frequencies present creates a highly variable level of interference minute by minute on the line
Re: ADSL to ADSL2
01-06-2014 9:58 AM
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Phil
* I now limit to ADSL2 and, subjectively, it seems to re-sync slightly quicker
Using a TP-Link Archer VR600 modem-router.
Re: ADSL to ADSL2
01-06-2014 10:07 AM
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If the line is operating on ADSL1 or ADSL2 (not 2+), regardless of which end selected it, then the DSLAM isn't going to be outputting anything on the 2+ frequencies.
I know my line syncs at higher rates with the modem set to ADSL1 or ADSL2, you don't need anything changed at the exchange.
Quote from: ITU During the exchange process, each receiver shares with its corresponding far-end transmitter certain transmission settings that it expects to see. Specifically, each receiver communicates to its far-end transmitter the number of bits and relative power levels to be used on each DMT subcarrier, as well as any messages and final data rates information.
Re: ADSL to ADSL2
02-06-2014 10:36 AM
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I've placed the order for you, this should complete tomorrow morning for you. If the changes aren't that great or are worse, it'll only take 24 hours to revert back to ADSL1
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