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    • 1 Post By speedyrite
    • 1 Post By gorebrush
    • 1 Post By epyon

    FTTC Speed Tests

    This is a discussion on FTTC Speed Tests within the Sky Broadband (Fibre) Help forums, part of the Sky Broadband help and support category; Had a bit of spare time on my hands today (always a dangerous thing) so I continue to research in ...

    1. #1
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      FTTC Speed Tests

      Had a bit of spare time on my hands today (always a dangerous thing) so I continue to research in my quest to learn about and better understand the detailed end-to-end techie mechanics of how FTTC works (and in particular SFU) but got sidetracked on this subject. (Maybe I should apply to be a Virgin Media apprentice engineer? I wonder if they would they take a 55 year old with a CCNA and a desire to get into network engineering?)

      Speed testing is always a hot topic, but never more so for those with SFU and in particular those who are experiencing the "half speed" problem. It looks like one culprit might be aluminium (instead of copper) wire between the home and the street cabinet.

      Everyone seems to have an opinion of Speedtest.net - The Global Broadband Speed Test and the BT Speedtesters and probably have their own favourite speed testing sites and methods (I know I do!)

      But I came across a couple of interesting looking resources, so I thought I'd put them out there and see if Skyuser members find them interesting and to get feedback on what they make of them:

      1. Understanding broadband speed measurements
      http://measurementlab.net/sites/defa...asurements.pdf

      2. Measurement Lab's Network Diagnostics (comprehensive speed test & diagnostics)
      Run NDT | M-Lab

      Haven't had time yet to read #1 or try #2 myself but enjoy!

      Cheerio now...


      (Thanks to the kitz forum for the links)
      Last edited by speedyrite; 11-05-12 at 07:31 PM.
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    4. #2
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      Re: FTTC Speed Tests

      Has anyone tried this yet?

      "M-Labs Network Diagnostic Tool (NDT) provides a sophisticated speed and diagnostic test. An NDT test reports more than just the upload and download speeds — it also attempts to determine what, if any, problems limited these speeds, differentiating between computer configuration and network infrastructure problems. While the diagnostic messages are most useful for expert users, they can also help novice users by allowing them to provide detailed trouble reports to their network administrator."
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    5. #3
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      Re: FTTC Speed Tests

      Finally got around to trying the Measurement Lab's Network Diagnostics (comprehensive speed test & diagnostics)
      Run NDT | M-Lab

      In addition to reporting my connection's upload and download speed, which are much the same as I have seen on other speedtest websites, it also reported lots of other info on the Detailed tab:

      Your system: Mac OS X version 10.7.4
      Java version: 1.6.0_31 (x86_64)

      TCP receive window: 66608 current, 66608 maximum
      1.0E-6 packets lost during test
      Round trip time: 12 msec (minimum), 84 msec (maximum), 16.25 msec (average)
      Jitter: 72 msec
      0 seconds spend waiting following a timeout
      TCP time-out counter: 214
      0 selective acknowledgement packets received

      No duplex mismatch condition was detected.
      The test did not detect a cable fault.
      No network congestion was detected.
      No network address translation appliance was detected.


      0.0078% of the time was not spent in a receiver limited or sender limited state.
      98.53% of the time the connection is limited by the client machine's receive buffer.
      Optimal receive buffer: 68206592 bytes
      0 duplicate ACKs set

      And there is yet more statistics on the Advanced tab.

      More potentially useful testing tools here:
      http://www.measurementlab.net/measurement-lab-tools
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    6. #4
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      Re: FTTC Speed Tests

      I think one of the issues that modern broadband connections have brought is there are many more layers between the user and the internet connection itself - what I mean is this...

      Back in the days of dial up - I had a single computer with a modem connected directly to the internet - And back in the those days the only way to increase speeds were to join an ISP which supported the faster modem speeds (K56Flex or X2 modems anyone?) and having the cleanest telephone line possible.

      I think the best I managed out of my home line was 51,667bps which yielded something like a 5KB/s download speed. Oh, so slow.

      What I'm getting at here is that your basic connection to the internet basically happened over a telephone call. Now, it occurs through a broadband modem (BT Broadband "Frog" USB Modems anyone?) which has to synchronise with the exchange - and there are all manner of variables that now influence the speed available. Then, later as internet connections turned to routers with "true" always-on broadband, and wireless, we are adding more and more layers to the internet connection than just a 56k modem dialling up.

      One of the things this has led to though is that this has made it more complex for the layperson, and frustration where speed tests come back at 20Mbps where the connection to the users home is 40Mbps. However, because the end user has a 3 year old laptop with only G Wireless capability (i.e. 54Mbit with a "real world" throughput of 20Mbit) - the user would be inclined to blame the ISP. Why do I only have 20Mbit when I was promised 40Mbit.... for example.

      Maybe I am rambling, but that is just my 2 penneth.

      (Coming from a near 29 year old (Birthday tomorrow) with a CCNP btw..)
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    7. #5
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      Re: FTTC Speed Tests

      I bow to your superior qualification sir!

      Yes I had the "Frog" USB modem when I first got ADSL from PIPEX in 2002 - the dizzy heights of 0.5Mbps...

      I trust that you are enjoying SFU and rating it highly?

      [Oh and a happy birthday to you. 29 eh? Happy days!]
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    8. #6
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      Re: FTTC Speed Tests

      Quote Originally Posted by speedyrite View Post
      Finally got around to trying the Measurement Lab's Network Diagnostics (comprehensive speed test & diagnostics)
      Run NDT | M-Lab

      In addition to reporting my connection's upload and download speed, which are much the same as I have seen on other speedtest websites, it also reported lots of other info on the Detailed tab:

      Your system: Mac OS X version 10.7.4
      Java version: 1.6.0_31 (x86_64)

      TCP receive window: 66608 current, 66608 maximum
      1.0E-6 packets lost during test
      Round trip time: 12 msec (minimum), 84 msec (maximum), 16.25 msec (average)
      Jitter: 72 msec
      0 seconds spend waiting following a timeout
      TCP time-out counter: 214
      0 selective acknowledgement packets received

      No duplex mismatch condition was detected.
      The test did not detect a cable fault.
      No network congestion was detected.
      No network address translation appliance was detected.


      0.0078% of the time was not spent in a receiver limited or sender limited state.
      98.53% of the time the connection is limited by the client machine's receive buffer.
      Optimal receive buffer: 68206592 bytes
      0 duplicate ACKs set

      And there is yet more statistics on the Advanced tab.

      More potentially useful testing tools here:
      Use tools running on M-Lab to test your Internet connection. | M-Lab
      Thats interesting, mine says this:

      Network congestion may be limiting the connection.
      No network address translation appliance was detected.

    9. #7
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      Re: FTTC Speed Tests

      Mine also says that :S

      i am having speed issues

      Your system: Windows 7 version 6.1
      Java version: 1.6.0_31 (x86)

      TCP receive window: 183960 current, 261340 maximum
      8.9354E-5 packets lost during test
      Round trip time: 28 msec (minimum), 115 msec (maximum), 38.81 msec (average)
      Jitter: 87 msec
      0 seconds spend waiting following a timeout
      TCP time-out counter: 240
      258 selective acknowledgement packets received

      No duplex mismatch condition was detected.
      The test did not detect a cable fault.
      Network congestion may be limiting the connection.
      No network address translation appliance was detected.

      0.9433% of the time was not spent in a receiver limited or sender limited state.
      5.13% of the time the connection is limited by the client machine's receive buffer.
      Optimal receive buffer: 267612160 bytes
      0 duplicate ACKs set
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    10. #8
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      Re: FTTC Speed Tests

      Quote Originally Posted by web_wizard View Post
      Thats interesting, mine says this:

      Network congestion may be limiting the connection.
      No network address translation appliance was detected.
      @web_wizard: Interesting, from other posts you have made I think you too are having a slower than expected speed issue?
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    11. #9
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      Re: FTTC Speed Tests

      Quote Originally Posted by speedyrite View Post
      @web_wizard: Interesting, from other posts you have made I think you too are having a slower than expected speed issue?
      Indeed. My speedtest.net results have now improved to 37mb however, my throughput has not increased inline with it which I don't get. This suggests an issue at SKY's side somewhere but no one has a clue. Very frustrating. Just ran another test and it still says there is some congestion so your test site is very interesting.

     

     

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