ADSL2+, should it be faster than this?
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- Re: ADSL2+, should it be faster than this?
ADSL2+, should it be faster than this?
27-07-2012 9:15 AM
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On ADSL1, for the last 8 and a bit months, I've been synced at 8128kpbs, attenuation usually 17/18dB, SNR margin varying around 13dB. Immediately after the upgrade, this changed drastically. Attenuation is now 26dB, SNR margin has been as low as 4dB and as high as 10dB. Initially the downstream speed was ~14mbps, but it's now down around ~12mbps. My setup is a Draytek Vigor 100 modem attached to a Linux box, and I've actually got monitoring set up to graph the stats from the modem, see attached images
Now, I'm not really complaining, as obviously any increase in speed for free is nice, but I was expecting a bit more than this. A couple of speed estimators I've used online suggest I should be getting around 17mbps with these line stats. Is it likely there's a problem somewhere? Am I expecting too much, or just being impatient? How long should the line take to settle?
Re: ADSL2+, should it be faster than this?
27-07-2012 9:41 AM
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The attenuation increasing from 18dB to 26dB is frankly terrible - it should only increase by about 2dB to 4dB
When you say you were moved to ADSL2 I assume this was part of a move from 20CN to 21CN which involves a wiring change at the exchange. Unless this included a couple of kilometres of extra wire or they moved the exchange in the process it shouldn't have had that effect.
Re: ADSL2+, should it be faster than this?
27-07-2012 9:53 AM
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Reading around how ADSL works I was expecting the attenuation to increase, but was a bit surprised by how much it changed, so good to have my suspicions confirmed. In a straight line I'm less than 1km from my exchange, so I doubt anything quite that crazy will have been done to the line I assume it's essentially moving the line from an ADSL1 "endpoint" to an ADSL2+ "endpoint" within the exchange.
One other thing to note is that I have had a few disconnects during the day since the switchover. I had put that down the the line sorting itself out, but could that be indicative of a problem?
Re: ADSL2+, should it be faster than this?
27-07-2012 10:12 AM
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Before the changeover
Near attenuation 17dB
Far attenuation 21dB
After changeover
Near attenuation 26dB
Far attenuation 11dB initially then 6dB
Normally the upstream attenuation should be about half the downstream and "near" is usually the upstream
Do you have another modem or router you can try
Re: ADSL2+, should it be faster than this?
27-07-2012 10:41 AM
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--------------------------- ATU-R Info (hw: annex A, f/w: annex A) -----------
Running Mode : ADSL2+(G.992.5) State : SHOWTIME
DS Actual Rate : 12028000 bps US Actual Rate : 1100000 bps
DS Attainable Rate : 12028000 bps US Attainable Rate : 1104000 bps
DS Path Mode : Interleave US Path Mode : Interleave
NE Current Attenuation : 26 dB Cur SNR Margin : 7 dB
DS actual PSD : 11. 9 dB US actual PSD : 20. 4 dB
ADSL Firmware Version : 131701_A
-------------------------------- ATU-C Info ---------------------------------
Far Current Attenuation : 6 dB Far SNR Margin : 11 dB
CO ITU Version[0] : 00004946 CO ITU Version[1] : 0000544e
DSLAM CHIPSET VENDOR : < IFTN >
I do have an old Netgear DG634 I can try, which I think supports 2+, I'll give that a try tonight. If nothing else it should help confirm I'm getting the stats the right way round.
Re: ADSL2+, should it be faster than this?
27-07-2012 11:11 AM
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It will be interesting to see what the Netgear reports
Re: ADSL2+, should it be faster than this?
27-07-2012 1:09 PM
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US should be around 12 and DS should be around 20
NB your old netgear may report the DS power as 0 - this is not a fault - its a known bug in many routers
Re: ADSL2+, should it be faster than this?
27-07-2012 1:22 PM
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When I was on ADSL1, the same modem did report 0 for both of these.
Re: ADSL2+, should it be faster than this?
29-07-2012 3:14 PM
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US Connection Rate: 1067 DS Connection Rate: 14963
DS Line Attenuation: 22 DS Margin: 6
US Line Attenuation: 11 US Margin: 7
US Transmit Power : 0 DS Transmit Power: 0
Showtime Count: 1 DS Max Attainable Bit Rate: 16884
BitSwap: 1 US Max Attainable Bit Rate: 1068000
Can someone from Plusnet confirm whether this may indicate a problem with the line? From what I can tell, the increase in attenuation I've seen when switching to ADSL2+ is higher than would be expected, and even at that attenuation, I'm not getting the speeds I should. Both devices I've tested with were plugged into the master socket, which in my house isn't an NTE5, but a normal double socket plate.
Re: ADSL2+, should it be faster than this?
30-07-2012 8:24 PM
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Quote from: plusnet Estimated line speed:
8Mb (Accurate to within +/- 1Mbit) - Checked on 2012-06-15 10:35:55
Current line speed:
11.9 Mb
Could something here be limiting my line? Or am I simply making it take longer to settle by keeping on fiddling with it?
Re: ADSL2+, should it be faster than this?
31-07-2012 11:02 AM
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Just checked and your profile matches across ours and BTs sides at 11900, this ties in well with the estimate given for your line at http://www.dslchecker.bt.com/adsl/adslchecker.welcome though there are one or two disconnections showing. I'd recommend checking filters and trying the router in the test socket if possible to see if this eliminates the drops, if not then we'd need to escalate this as a fault for you - please run through the wizard at http://faults.plus.net and we'll pick it up once that's been done (if the fault is still apparent following testing).
Re: ADSL2+, should it be faster than this?
31-07-2012 11:41 AM
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I realise that the speeds are within the expected range for my line, it's just that given that my ADSL1 connection was so good, I was expecting the ADSL2+ connection to be a lot faster than this. Is that an unrealistic expectation?
Thanks.
Re: ADSL2+, should it be faster than this?
31-07-2012 1:39 PM
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Having checked your routers also, I'm not convinced that either are specifically ADSL2+ compatible - I realise they are working and the netgear especially is showing the correct protocol (I can see on further googling that an official ADSL2+ compatible firmware update has been released) but I would seriously recommend trying a more recent router that was released with ADSL2+ in mind if that's possible.
Re: ADSL2+, should it be faster than this?
31-07-2012 2:02 PM
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http://www.broadbandbuyer.co.uk/Shop/Specifications.asp?ProductID=4276
http://web.archive.org/web/20080120153108/http://www.draytek.co.uk/products/vigor100.html (it's not listed on the Draytek site currently, but the Wayback Machine has the page).
I had to upgrade the FW on the Netgear before it would sync at > 8mpbs, the Draytek is already on the latest firmware.
Is it possible that the old microfilters don't support ADSL2+?
Edit: and the Draytek even says "ADSL2/2+" on the front
Re: ADSL2+, should it be faster than this?
01-08-2012 10:57 AM
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