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Speed Thread (Before and after transfer speed comparisons)

VileReynard
Champion
Posts: 11,844
Thanks: 455
Fixes: 17
Registered: ‎01-09-2007

Re: Speed Thread (Before and after transfer speed comparisons)

Quote from: Word
It would be too simplistic to say that as I was getting around 50% ± of the "up to 8M" connection that I could expect around 50%± of 24M but to actually get around the same after several reboots of the modem indicates that there is a long way to go yet.

Doesn't work like that unfortunately. ADSL2+ works best on really good short lines, if you can get above about 4.5-5Mbps on ADSL then you'll see an increase in speed with ADSL2+. If you're below about 1.5Mbps again you'll see an increase in speed. But for lines between about 1.5Mbps to 4.5Mbps the actual speed is unlikely to increase by much. Have a look at the graph here:
http://www.internode.on.net/residential/internet/home_adsl/extreme/
If you're in that middle band then ADSL2+ doesn't really do much to increase the speed unfortunately.

That's disappointing to hear, I was kind of hoping for a bit more speed up and down but it seems I'm at the optimum  Cry

Note that the link you posted is Australian.
Australians like to live close to their telephone exchanges, in cities.

"In The Beginning Was The Word, And The Word Was Aardvark."

michaelm
Grafter
Posts: 83
Registered: ‎21-06-2007

Re: Speed Thread (Before and after transfer speed comparisons)

Hi there
Doing some further test on my line last night around 11pm my speed seems to have dropped to around the 7Mbps which is not too unlike what I was getting before.
That is surprising as the first day my speed was over 10Mbps. Do PlusNet need to update any profiles on their end? Under "High Speed Broadband" in my account settings it still reports a 7000 BRAS profile. Does this need changing or does it happen automatically?
Any help or advice will be welcome. Thanks
M
pnf
Grafter
Posts: 266
Registered: ‎07-11-2007

Re: Speed Thread (Before and after transfer speed comparisons)

Since the last time I posted, my connection had been stable for about 42 hours and then it disconnected yesterday at about 12:30.  Prior to disconnecting, the Sync Speed (up/down) was 810/11,581 kbps and typically the SN Margin (up/down) was 9.5/6.5-8.5 dB.  After disconnecting, the Sync Speed (up/down) was 835/13,964 kbps and the SN Margin (up/down) was 9.5/2.5 dB.  I tried restarting and rebooting the router a number of times in an attempt to increase the downstream SN Margin but it only increased to 3.5 dB.  Subsequently, the downstream SN Margin on the connection fluctuated between 3.5 and 4.0 dB but the connection remained alive even though the error count was increasing. 
I rebooted the router this morning, after which the Sync Speed (up/down) was 835/13,879 kbps and the SN Margin (up/down) was 8.5/3.5 db.  The connection was lost again at about 12:10 today and now the Sync Speed (up/down) is 450/14,292 kbps and the SN Margin (up/down) is 23.0/2.0 dB.  I find it really odd that the downstream rate keeps on increasing and the SN Margin keeps on reducing regardless of the fact that the error count on the router is increasing as a result.  Surely if this continues my line will become more and more unstable.  Hopefully the rate adaption system will get there in the end.
Having said this, since my IP Profile increased to 10,000 kbps and prior to today, my download speeds have been consistently between 8,900 and 9,679 kbps and my upload speeds have been between 670 and 698 kbps.  Today, download speeds have been about 9,300 kbps and upload speeds have been 376 kbps.
Current Router Stats:
Link Information  - 16:15 - 10/12/2008    (router disconnected at about 12:10)
Uptime: 0 days, 4:02:26
Modulation: G.992.5 annex A
Bandwidth (Up/Down) [kbps/kbps]: 450 / 14,292
Data Transferred (Sent/Received) [MB/MB]: 6.92 / 68.84
Output Power (Up/Down) [dBm]: 12.0 / 23.0
Line Attenuation (Up/Down) [dB]: 17.0 / 33.0
SN Margin (Up/Down) [dB]: 23.0 / 2.0
Vendor ID (Local/Remote): TMMB / TSTC
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 1 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 20 / 0
FEC Errors (Up/Down): 3,654,072 / 15,024,445
CRC Errors (Up/Down): 142,813 / 66
HEC Errors (Up/Down): 131,122 / 58

Plusnet Staff
Plusnet Staff
Posts: 12,169
Thanks: 18
Fixes: 1
Registered: ‎04-04-2007

Re: Speed Thread (Before and after transfer speed comparisons)

The changing of the speed profile on our side isn't automated yet so will lag a little bit behind. I've now updated it though, BT report you should have a 13000kbps BRAS profile. You'll need to disconnect/reconnect for the change to take effect.
Plusnet Staff
Plusnet Staff
Posts: 12,169
Thanks: 18
Fixes: 1
Registered: ‎04-04-2007

Re: Speed Thread (Before and after transfer speed comparisons)

Quote from: pnf
After disconnecting, the Sync Speed (up/down) was 835/13,964 kbps and the SN Margin (up/down) was 9.5/2.5 dB.  I tried restarting and rebooting the router a number of times in an attempt to increase the downstream SN Margin but it only increased to 3.5 dB.  Subsequently, the downstream SN Margin on the connection fluctuated between 3.5 and 4.0 dB but the connection remained alive even though the error count was increasing. 

21CN now has a 3dB target SNR profile. If your line is stable at 6dB for long enough (and long enough depends on how long since the last change and what else it's done) then it will try you on a 3dB profile. If it's unstable then it should undo the change the next day.
ckempo
Newbie
Posts: 2
Registered: ‎20-11-2008

Re: Speed Thread (Before and after transfer speed comparisons)

Not sure if Plusnet are requiring any feedback about this, but here we go:
I went live last night, and without changing any router setings, my stats were as follows:
DSL Status: Connected
DSL Modulation Mode: MultiMode
DSL Path Mode: Interleaved
Downstream Rate: 15226 kbps
Upstream Rate: 1085 kbps
Downstream Margin: 2147483646 db
Upstream Margin: 5 db
Downstream Line Attenuation: 27 db
Upstream Line Attenuation: 7 db
Downstream Transmit Power: 12 db
Upstream Transmit Power: 23 db

Following that, I changed the modulation to ADSL2+ and tried again:
DSL Status: Connected
DSL Modulation Mode: ADSL2+
DSL Path Mode: Interleaved
Downstream Rate: 15226 kbps
Upstream Rate: 1085 kbps
Downstream Margin: 3 db
Upstream Margin: 5 db
Downstream Line Attenuation: 27 db
Upstream Line Attenuation: 7 db
Downstream Transmit Power: 12 db
Upstream Transmit Power: 23 db

Speedtests are sitting somewhere between 7-10 Mbps at the mo, but the connection hasn't been very stable yet - am waiting for it to even out, will have another look tonight.
VileReynard
Champion
Posts: 11,844
Thanks: 455
Fixes: 17
Registered: ‎01-09-2007

Re: Speed Thread (Before and after transfer speed comparisons)

Quote
Downstream Margin: 2147483646 db

Seems rather high!

"In The Beginning Was The Word, And The Word Was Aardvark."

pnf
Grafter
Posts: 266
Registered: ‎07-11-2007

Re: Speed Thread (Before and after transfer speed comparisons)

Thanks Dave, that explains everything!
I wasn't aware that the target SNR profile was 3 dB on ADSL2+, I thought that it was 6 dB as with ADSL1.  I had been searching for technical information about ADSL2+ that would explain things such as this but I didn't uncover anything.
pnf
Grafter
Posts: 266
Registered: ‎07-11-2007

Re: Speed Thread (Before and after transfer speed comparisons)

I have just done a BT speed test and it reported that my IP Profile is now 11,000 kbps.  Just thought I would let you know so that it can be increased on the PlusNet side.  Thanks.
pnf
Grafter
Posts: 266
Registered: ‎07-11-2007

Re: Speed Thread (Before and after transfer speed comparisons)

Thanks for increasing my IP Profile, it is now at 11,000 kbps.  I've just done my first speed test after rebooting the router and the download speed has now increased to 10,631 kbps.
greyposter
Grafter
Posts: 235
Registered: ‎27-06-2007

Re: Speed Thread (Before and after transfer speed comparisons)

My BB speed has gone back to pre trial speed
ie

     
Test1 comprises of Best Effort Test:  -provides background information.
    Your DSL connection rate: 7392 kbps(DOWN-STREAM),  448 kbps(UP-STREAM)
    IP profile for your line is - 6000 kbps
    Actual IP throughput achieved during the test was - 5035 kbps
G.DMT Annex A
Downstream Rate: 7392 kbps 
Upstream Rate: 448 kbps 
Channel: Interleaved
Current Noise Margin: 13.0 dB (Downstream), 26.0 db (Upstream)
Current Attenuation: 29.9 dB (Downstream), 18.5 db (Upstream)
Current Output Power: 19.8 dB (Downstream), 12.2 db (Upstream




pnf
Grafter
Posts: 266
Registered: ‎07-11-2007

Re: Speed Thread (Before and after transfer speed comparisons)

My downstream Sync Speed is gradually being nudged upwards.  It started the week at 11580 kbps and is now at 14004 kbps.  My upstream Sync Speed has been switching between the old ADSL1 rate of about 374 kbps and speeds between 665 and 714 kbps, it's currently at 374 kbps.  My IP profile started the week at 10,000 kbps and is now at 11,000 kbps.
Since switching over to the ADSL2+ service at 12:10 on 4th December, I have noticed that my line has disconnected at approximately 12:10 each day, except for one day.  Does the rate adaption system resync the line every 24 hours subject to certain conditions being met on the line? 
Speed tests this week:
Mon 08/12/2008 20:10 - IP Profile 10000 kbps  Actual Throughput Up/Down: 675/9667 kbps
Tue  09/12/2008 09:45 - IP Profile 10000 kbps  Actual Throughput Up/Down: 676/9667 kbps
Tue  09/12/2008 20:10 - IP Profile 10000 kbps  Actual Throughput Up/Down: 659/9661 kbps
***  PlusNet changed IP Profile to 10,000 kbps from 9,000 kbps  ***
Wed 10/12/2008 08:40 - IP Profile 10000 kbps  Actual Throughput Up/Down: 698/9394 kbps
Wed 10/12/2008 20:55 - IP Profile 11000 kbps  Actual Throughput Up/Down: 374/9365 kbps
Thu  11/12/2008 11:25 - IP Profile 11000 kbps  Actual Throughput Up/Down: 373/9392 kbps
***  PlusNet changed my IP Profile to 11,000 kbps from 10,000 kbps  ***
Thu 11/12/2008 11:40 - IP Profile 11000 kbps  Actual Throughput Up/Down: 376/10631 kbps
Thu 11/12/2008 21:15 - IP Profile 11000 kbps  Actual Throughput Up/Down: 665/10344 kbps
Fri  12/12/2008 09:20 - IP Profile 11000 kbps  Actual Throughput Up/Down: 714/10343 kbps
Fri  12/12/2008 12:40 - IP Profile 11000 kbps  Actual Throughput Up/Down: 373/10386 kbps
Router Stats:
Link Information - 13:18 Fri 12/10/2008  (line dsconnected at 12:10)
Uptime: 0 days, 1:07:48
Modulation: G.992.5 annex A
Bandwidth (Up/Down) [kbps/kbps]: 447 / 14,004
Data Transferred (Sent/Received) [MB/MB]: 5.14 / 72.42
Output Power (Up/Down) [dBm]: 12.0 / 23.0
Line Attenuation (Up/Down) [dB]: 17.0 / 33.5
SN Margin (Up/Down) [dB]: 23.0 / 2.5
Vendor ID (Local/Remote): TMMB / TSTC
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 2 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 40 / 0
FEC Errors (Up/Down): 0 / 1,978,532
CRC Errors (Up/Down): 0 / 7
HEC Errors (Up/Down): 0 / 7
Superuser
Superuser
Posts: 10,002
Thanks: 1,323
Fixes: 71
Registered: ‎06-04-2007

Re: Speed Thread (Before and after transfer speed comparisons)

Moderator's Note:
The second paragraph in the previous reply concerns a separate issue from speed comparisons. I have added that paragraph to a cross reference in the Questions thread so that discussions relating to that issue logically fit in the one place. Please keep the present thread for speed comparisons.
David (spraxyt)
David
michaelm
Grafter
Posts: 83
Registered: ‎21-06-2007

Re: Speed Thread (Before and after transfer speed comparisons)

@ Dave Post #79
Hi Dave
Thanks for updating that for me. I did some further test over the weekend and I was getting some comfortable speeds of 10-13Mbps and a reasonable upload of 800Kbs.
Will post some graphs tonight when I get back home.
Cheers for all your help.
Michael
gm4jjj
Rising Star
Posts: 697
Thanks: 6
Fixes: 3
Registered: ‎30-07-2007

Re: Speed Thread (Before and after transfer speed comparisons)


Now that interleaving is off on ADSL1 I get sync at 4448 / 672 Att 56db Noise Margin 6.6dB
This is the best result I have ever had - please don't change a thing.