Line Rate vs Speedtest Results

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daftjon

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#61354 14-May-2010 19:06

Some advice here would be appreciated.
My modem (Dynalink RTA1025) says I have Line Rate of around 20000 Kpbs.
However Speedtest is coming up with results around the 4 Mpbs mark.
I am on Orcon via Telecom Wholesale.
The local Telecom Whisper cabinet is less than 250m from my house.
There is a Splitter installed at the demarc point, so there is no point in doing an isolation test.
Thanks

muppet

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#330211 14-May-2010 19:24

Firstly, take speedtest with a grain of salt. It's a specific test between two points. If there's a single problem between those two points, you might (well, you will) get bad results. That doesn't mean your whole connection is slow.

Having said that, just because you've sync'd at 20Mb/s, doesn't mean you'll ever get that! Your ISP might have backhaul issues (from the exchange to their datacentre), local peering issues (Speedtest is usually hosted locally thus local peering capacity is tested) or other issues.

Are you seeing poor performance downloading from international sites with something like downloadthemall?

You don't state where you're speedtesting to, or what your actual problem is. Are you really seeing poor performance, or is it just the results you're getting making you unhappy?

I hate you.

insane

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#330212 14-May-2010 19:31

daftjon: Some advice here would be appreciated.
My modem (Dynalink RTA1025) says I have Line Rate of around 20000 Kpbs.
However Speedtest is coming up with results around the 4 Mpbs mark.
I am on Orcon via Telecom Wholesale.

Do you have FS/FS or FS/128k , if the latter then get the former and your problem will go away.

daftjon

15 posts

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#330235 14-May-2010 21:42

I have talked to Orcon, and upgraded to Max/Max. Will post updated results once it happens early next week.

daftjon

15 posts

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#331865 19-May-2010 14:14

There has been an improvement in Download speed, but not as much as expected. I am now getting around 6-7Mbps on the Consumer Speedtest.

cyril7

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#332053 20-May-2010 08:07

Hi, first could you actually post the full line stats from the modem not just the line sync rate. Also you say the line sync rate, is that the attainable or actual, the Dynalinks provide both, the attainable is impossible and simply a calculated figure by the modem.

Also try a speed test at www.speedtest.net and try the auckland server, also make sure that your PC is in good condition and freshly booted and handles flash player well. The speedtest site runs a flash app, I have seen on this PC (running XP and 2Gig of RAM) that if its having issues with memory leaks from other apps recently run then it will never see speeds more than 1-2Mb/s but if its freshly booted will see 15-16Mb/s.

Our kids play lots of online flash games, when these run in FF memory leaks will soon have 2Gbytes of no RAM and a machine falling on its knee's and the above condition.

Cyril

daftjon

15 posts

Geek

#332395 20-May-2010 15:13

Modem stats as follows.
PC freshly booted
Speedtest.net gave me 4Mbps

Line Rate
Up 16659 Kbps
Down 956 Kbps

Attainable Line Rate
Up 19956 Kbps
Down 1048 Kbps

Noise Margin
Up 12.7 dB
Down 13.8 dB

Line Attenuation
Up 12.0 dB
Down 4.0 dB

Output Power
Up 0.0 dBm
Down12.8 dBm

Other figures of concern?

Super Frame Errors
Up 30821
Down 7

HEC Errors
Up 22675

cyril7

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#332424 20-May-2010 15:59

Hi, that looks ok although the errors may be an issue, what time frame are those ones accumulated over, try redoing the speedtest noting the error count to get a feel for how many impacted in a real time frame.

Also what is the measured speedtest uplink speed, as thats the one the errors are impacting.

Failing that I would be talking to Orcon with a please explain.

Cyril

daftjon

15 posts

Geek

#333298 22-May-2010 16:04

Line Mode
ADSL2+

Line State
Show Time

Line Power State
L0

Line Up Time
00:00:16:18

Line Coding
Trellis On

Line Up Count
1

Line Rate
19899 Kbps
940 Kbps

Attainable Line Rate
22996 Kbps
952 Kbps

Noise Margin
12.1 dB
13.3 dB

Line Attenuation
12.0 dB
4.0 dB

Output Power
0.0 dBm
12.8 dBm

MSGC (number of bytes in overhead channel message)
51
2

B (number of bytes in Mux Data Frame)
236
58

M (number of Mux Data Frames in FEC Data Frame)
1
2

T (Mux Data Frames over sync bytes)
3
4

R (number of check bytes in FEC Data Frame)
0
2

S (ratio of FEC over PMD Data Frame length)
0.3806
4.0000

L (number of bits in PMD Data Frame)
4982
240

D (interleave depth)
1
1

Delay
0
1

Super Frames
60108
61066

Super Frame Errors
289
0

RS Words
0
977070

RS Correctable Errors
0
0

RS Uncorrectable Errors
0
0

HEC Errors
254
0

OCD Errors
0
0

LCD Errors
0
0

Total Cells
45922248
0

Data Cells
197754
0

Bit Errors
0
0

Total ES
248
225

Speedtest.net (Auckland Server) is giving me even lower download speed around 3Mb/s, Upload is looking OK at 0.8Mb/s.
When looking at the modem stats, it sometimes says "Webpage can not be found". What would be causing this.

cyril7

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#333300 22-May-2010 16:08

Maybe your Dynalink is dying or there is ethernet issues causing packet loss between your PC and the modem, ahhhhhhhh how are you connecting to you modem, via wireless, then that may well be the problem, if you are try a wired connection.

Cyril

daftjon

15 posts

Geek

#333302 22-May-2010 16:12

I have a wired connection. I have tested the computer plugged directly into the modem rather than through the home network, and get the same results.
Maybe I should be looking at a replacement Modem, any suggestions?

cyril7

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#333303 22-May-2010 16:15

My favourite is the TP-Link 8840 or the old DSE XH9949, but the latter no longer seems to be available.

http://www.ascent.co.nz/productspecification.aspx?ItemID=361956

If you want wireless also the 8901 get good reports, but have not personally used it.

http://www.ascent.co.nz/productspecification.aspx?ItemID=9384105

Cyril