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ADSL to ADSL2+

zpeterk
Grafter
Posts: 377
Registered: 14-04-2007

ADSL to ADSL2+

I have been upgraded to ADSL2 on the 2nd January and it was all hunky dory until the recent routing problems on the network. I had changed router to a WAG320N as my old WAG200N s graphic interface was locking up. I think smaller people will have rebooted the router several times the other day hoping to resolve the lack of service when plusnet had routing issues.
I am within 200m of the exchange.
My line stats when on 20CN  Downstream margin 5db syncing at 8128kbs since 2006
On 2/1/13
DSL Status:                                      Connected
DSL Modulation Mode:                  MultiMode
DSL Path Mode:                              Interleaved
Downstream Rate:                        20626 kbps
Upstream Rate:                              1091 kbps
Downstream Margin:                      6 db
Upstream Margin:                          7 db
Downstream Line Attenuation:    7 db
Upstream Line Attenuation:          0.5 db
Downstream Transmit Power:    9 db
Upstream Transmit Power:          13 db

07/01/13¬
DSL Status:                                      Connected
DSL Modulation Mode:                  MultiMode
DSL Path Mode:                              Interleaved
Downstream Rate:                        21216 kbps
Upstream Rate:                              1063 kbps
Downstream Margin:                      1 db
Upstream Margin:                          7 db
Downstream Line Attenuation:    5 db
Upstream Line Attenuation:          0.5 db
Downstream Transmit Power:    9 db
Upstream Transmit Power:          12 db
10/01/13 9:17
--- DSL Information ---
DSL Driver Version:      AnnexA version - A2pB023k.d21d
DSL VPI/VCI:        0/38
DSL Status:                      Showtime
DSL Mode:                        ADSL2+
DSL Channel:       
DSL Upstream Rate:      1119 Kbps
DSL Downstream Rate: 6656 Kbps
                                        Down        up   
DSL Noise Margin:        30.3 dB      6.5 dB
DSL Attenuation:            8.0 dB      2.0 dB
DSL Transmit Power:    0.0 dBm    11.0 dBm
How do I get back to the good connection?
14 REPLIES
Community Veteran
Posts: 26,678
Thanks: 900
Fixes: 10
Registered: 10-04-2007

Re: ADSL to ADSL2+

You need to do one resync and check the sync speed and noise margin immediately after. If it is still high noise margin and low sync speed it probably means your connection has been banded to limit the sync speed because of all the disconnections. Plusnet will want to see around 24 hours of continuous connection when you can ask them to do a SNR Reset which should put things back to normal (a reset on an unstable line is counter-productive which is why they need to see the period of stability).
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 (£13/month)
Mobile: iD mobile (£4/month)
Community Veteran
Posts: 3,789
Registered: 08-06-2007

Re: ADSL to ADSL2+

Quote from: zpeterk
DSL Downstream Rate: 6656 Kbps

As Jelv says, this figure indicates that your line has been banded.  As he also says, hang fire for 24 hours then request an SNR reset Smiley
B.
zpeterk
Grafter
Posts: 377
Registered: 14-04-2007

Re: ADSL to ADSL2+

Downstream rate now 4554kbs, SNR was reset yesterday, do I leave it alone or should I reboot the router?
Community Veteran
Posts: 26,678
Thanks: 900
Fixes: 10
Registered: 10-04-2007

Re: ADSL to ADSL2+

For some reason SNR resets sometimes fail and it looks like yours has. What's the noise margin at the moment?
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 (£13/month)
Mobile: iD mobile (£4/month)
zpeterk
Grafter
Posts: 377
Registered: 14-04-2007

Re: ADSL to ADSL2+

30.5db
Community Veteran
Posts: 26,678
Thanks: 900
Fixes: 10
Registered: 10-04-2007

Re: ADSL to ADSL2+

Try ONE resync and post the sync speed and noise margin again.
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 (£13/month)
Mobile: iD mobile (£4/month)
Highlighted
zpeterk
Grafter
Posts: 377
Registered: 14-04-2007

Re: ADSL to ADSL2+

These are the stats after reboot
--- DSL Information ---
DSL Driver Version:  AnnexA version - A2pB023k.d21d
DSL VPI/VCI:        0/38
DSL Status:          Showtime
DSL Mode:            ADSL2+
DSL Channel:       
DSL Upstream Rate:  1123 Kbps
DSL Downstream Rate: 4544 Kbps
                      Down        up   
DSL Noise Margin:    30.9 dB      6.2 dB
DSL Attenuation:      8.0 dB      2.0 dB
DSL Transmit Power:  0.0 dBm    10.8 dBm
Community Veteran
Posts: 4,845
Thanks: 121
Fixes: 24
Registered: 14-07-2009

Re: ADSL to ADSL2+

Quote from: jelv
For some reason SNR resets sometimes fail...

In my experience they often fail if the profile has been banded.
zpeterk
Grafter
Posts: 377
Registered: 14-04-2007

Re: ADSL to ADSL2+

What next then?
Superuser
Superuser
Posts: 9,511
Thanks: 861
Fixes: 53
Registered: 06-04-2007

Re: ADSL to ADSL2+

The sync speed of 4544kbps is at the top of one of the banded ranges so almost certainly the problem is that your profile has been banded by BT. This band is the next one down from where your were previously.
Something is clearly amiss here. I suggest raising a slow speed fault at http://faults.plus.net to get this looked at properly.
David
zpeterk
Grafter
Posts: 377
Registered: 14-04-2007

Re: ADSL to ADSL2+

Seems to have settled down now, plusnet profile says 19.8 but btw speed tester says 17.13 should it be higher or is that about it?
--- DSL Information ---
DSL Driver Version:  AnnexA version - A2pB023k.d21d
DSL VPI/VCI:        0/38
DSL Status:          Showtime
DSL Mode:            ADSL2+
DSL Channel:       
DSL Upstream Rate:  1187 Kbps
DSL Downstream Rate: 23752 Kbps
                      Down        up   
DSL Noise Margin:    3.5 dB      6.1 dB
DSL Attenuation:      8.0 dB      2.0 dB
DSL Transmit Power:  0.0 dBm    12.2 dBm
Plusnet Alumni (retired) chrispurvey
Plusnet Alumni (retired)
Posts: 5,369
Fixes: 1
Registered: 13-07-2012

Re: ADSL to ADSL2+

Hi there,
I've bumped your line profile according to your sync rate, so it's now at 20.9Mb/s, you should be seeing speeds close tho that, although it will tend to be slightly lower. If there's a big difference then it's a concern if it's not then it's fine.
zpeterk
Grafter
Posts: 377
Registered: 14-04-2007

Re: ADSL to ADSL2+

btw tester now says 19.88Mbs down of 21 Mbps Max Achievable Speed and  1.01Mbs up of 0.83Mbs Max Achievable Speed. 117% for up not bad then!
Plusnet Alumni (retired) chrispurvey
Plusnet Alumni (retired)
Posts: 5,369
Fixes: 1
Registered: 13-07-2012

Re: ADSL to ADSL2+

That look's spot on  Smiley