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xlinknz

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#20500 28-Mar-2008 12:59
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I'm not sure of the status of the dsl2+ rollout at my local exhange ie whether the profile has been changed but my modem now syncs at dsl2+ but there is absolutely no difference in download speed

someone in here mentioned I would need to upgrade to FS/FS, is this true ?!

I'm on xnet river 128/FS

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coffeebaron
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  #119339 28-Mar-2008 13:19
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Yes & No. If your are on a good line that syncs say 6Mbps+ upwards on ADSL2+, then yes going to FS/FS will help you take advantage of this. If you are on a more marginal line, say 2-3Mbps DSL or 4-5Mbps DSL2, then going to FS/FS will have less impact. Stats show that on a FS/128k plan, your downstream tends to get limited to around the 4Mbps.

However, there are other advantages to FS/FS. If you send large emails, or use VoIP for your land-line.




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xlinknz

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  #119342 28-Mar-2008 13:35
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Currenly I typically get 2.7Mbit max download and this hasn't changed with my modem syncing at dsl2+

My dsl1 stats were as follows:

Line ModeG.DMT Line StateShow Time  
Latency TypeInterleave Line Up Time00:08:37:26 
Line CodingTrellis On Line Up Count

Line Rate7616 Kbps160 Kbps
Attainable Line Rate8928 Kbps864 Kbps
Noise Margin14.8 dB24.0 dB
Line Attenuation26.0 dB14.0 dB
Output Power19.7 dBm4.4 dBm

I can supply the same stats under dsl2+ tonight


Spyware
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  #119344 28-Mar-2008 13:48
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You are syncing at 7.6 Mbps. If you are only getting throughput of 2.7 Mbps then go to http://www.speedguide.net/ and run TCP analyser and TCP Optimiser. Default windows settings for tcp receive window size is not optimised for long propogation delay on Internet.

EDIT: Then upgrade plan to full speed up.




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coffeebaron
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  #119377 28-Mar-2008 17:03
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Yes, with those sync speeds, FS/FS will definitely be beneficial. But as posted above, there are a few other factors involved that may still influence your downstream.




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xlinknz

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  #119385 28-Mar-2008 18:19
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Here is my adsl2+ stats

Line ModeADSL2+ Line StateShow Time  
Line Power StateL0 Line Up Time05:07:23:21 
Line CodingTrellis On Line Up Count

StatisticsDownstreamUpstream
Line Rate11675 Kbps166 Kbps
Attainable Line Rate14624 Kbps933 Kbps
Noise Margin11.9 dB29.9 dB
Line Attenuation30.0 dB13.2 dB
Output Power18.6 dBm12.3 dBm

I suspect that TCNZ have not finished at my exchange as there has been no increase in my download rate despite the attainable line rate increasing by 50% ie from 7.6Mbit to 11.6Mbit

Thoughts ?


Spyware
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  #119398 28-Mar-2008 19:10
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As stated above, your low throughput is more likely related to tcp receive window size. Goto http://www.speedguide.net/ and run the TCP Analyser. Post results. Mine are below.

« SpeedGuide.net TCP Analyzer Results »
Tested on: 03.28.2008 02:08
IP address: 125.236.xxx.xxx

TCP options string: 020405b40103030301010402
MSS: 1460
MTU: 1500
TCP Window: 513920 (multiple of MSS)
RWIN Scaling: 3
Unscaled RWIN : 64240
Reccomended RWINs: 64240, 128480, 256960, 513920
BDP limit (200ms): 20557kbps (2570KBytes/s)
BDP limit (500ms): 8223kbps (1028KBytes/s)
MTU Discovery: ON
TTL: 51
Timestamps: OFF
SACKs: ON
IP ToS: 00000000 (0)




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hpj2007
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  #119400 28-Mar-2008 19:21
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From what I've heard, if your ISP is xnet you will not benefit from ADSL2+ yet.  Currently Xnet rate limits users to ADSL1 speeds even if you sync at 2+.  Don't quote me on this, saw this on another website.



xlinknz

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  #119405 28-Mar-2008 20:00
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Spyware: As stated above, your low throughput is more likely related to tcp receive window size. Goto http://www.speedguide.net/ and run the TCP Analyser. Post results. Mine are below.


Here they are: NOTE these are over my 802.11g connection but my download is the same whether ethernet or wifi

TCP options string = 020405b401010402
MTU = 1500
MTU is fully optimized for broadband.
MSS = 1460
Maximum useful data in each packet = 1460, which equals MSS.
Default TCP Receive Window (RWIN) = 17520
RWIN Scaling (RFC1323) = 0 bits
Unscaled TCP Receive Window = 17520

RWIN is a multiple of MSS
Other RWIN values that might work well with your current MTU/MSS:
513920 (MSS x 44 * scale factor of 8)
256960 (MSS x 44 * scale factor of 4)
128480 (MSS x 44 * scale factor of 2)
 64240 (MSS x 44)

bandwidth * delay product (Note this is not a speed test):

Your TCP Window limits you to: 701 kbps (88 KBytes/s) @ 200ms
Your TCP Window limits you to: 280 kbps (35 KBytes/s) @ 500ms
Consider increasing your RWIN value to optimize TCP/IP for broadband.
MTU Discovery (RFC1191) = ON
Time to live left = 103 hops
TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000 (0)

Niel
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  #119418 28-Mar-2008 20:47
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I had exactly the same sync speeds as xlinknz before and after ADSL2+.  Then going to Fusion (i.e. to FS/FS) my download speed increased significantly.  National speed is now around 6.5Mbps.

XNet staff has stated (was either here or in a help desk e-mail to me) that it is Telecom that has not yet enabled the ADSL2+ speed profiles.  It sync on ADSL2+ protocol, but the speed profile is still set to ADSL1.  There are however tirals/tests going on and some people are downloading around 15Mbps.  I think that Telecom will enable everyone at the same time, which should be once all the exchanges are upgraded.  This should be within a few months.




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MrChairman
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  #119687 30-Mar-2008 13:18
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As far as tcnz goes, if you are on an adsl2 profile then you will get adsl2 sync rates and speeds. Without the profile you obviously get neither. Xnet limits your connection, end of story

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