trogers

This being the case, I recommend you check to ensure your modem is set to auto, WAN of router to auto and Nic to auto. This is because the modem is also servicing your cable TV system

ntl:home 100/120 (Ambit) duplex setting The ntl:home 100/120 (Ambit) cable modem duplex setting can be configured by the user, by using the web pages at http://192.168.100.1/, user root password root. By default, the cable modem is configured to auto-negotiate its speed and duplex setting to be the same as your ethernet card. If you manually configure an explicit speed and duplex setting in your ethernet card, you should also configure the same one in the cable modem, thus removing auto-negotiation from both ends of the link. The optimal setting is to manually force both the ethernet card and the cable modem to full-duplex, thus avoiding all ethernet collisions, and avoiding any possibility of an auto-negotiation mistake.

Do not set Nic if you have a router. Leave Nic at auto. You can set WAN port of router to 10 full and test again.

Check your modem manual to see if it is set to default at full duplex.

Choose the 10 with half-duplex. Leave your Nic at auto.

Correct one thing at a time. Correct duplex mismatch first or correct EMI effect first. Not both together or else you cannot eliminate the right source of the problem.

If I recalled the link about adjusting for duplex setting, you should not adjust your Nic but your router if you are using one. "This section applies to your PC only if your PC ethernet card is connected directly to the cable modem, and not if you have an intervening device, e.g. a NAT router such as a Linksys or Netgear. If you have an intervening device such as a router, then this section applies to the WAN port of the router."

I am not using any router so I am not able to advise about this.

If my maths is any good, I believe 90% of 1.5 Mbps is 1.35 Mbps. 1.4 is 93.33% of 1.5, I believe.

Usually the effect is speed fluctuates significantly within minutes. And if EMI is too strong, you get disconnection.

Maybe you should start by elimination. Take away all other devices like speakers, TV sets, etc. and just connect your comp to the router and modem and check performance. Then bring in the other devices one by one and check if speed falls with each. Then you can know which is giving you the problem.

Both routers and modem are affected by EMI. A router also emits EMI and affects the modem when placed near each other.

Is your modem near any strong magnets like from a subwoofer? Even with power off, magnet still works.

Click on this link and post the results enclosed in the white box: https://www.speedguide.net/analyzer.php

LOL...your speed variations show your modem moving in a huge field of EMI. If you cannot relocate your modem elsewhere, enclose it in a metal box and earth the box.

Will you feel better if you know you have lots of company with this problem? This link may provide a clue for you: http://www.hardwareanalysis.com/content/topic/5695/

Still not to the expected optimum speed of 3.5-3.6 Mbps. A few things to check. Place your modem away from any electrical devices that may emit electromagnetic interference, eg. cordless phones, sound speakers, TV set...etc. Test speed with anitvirus turned off.

Hopefully with the driver update, your 'auto' setting in the Nic will do its auto sensing efficiently with minimum hiccups. Some more senior members of this forum advise to leave it be and perhaps things will get better with time. We can still do the tweak, and if auto sensing does not misbehave, you should get near 90% of your subscribed speed. Download the Cablenut adjuster program from www.cablenut.com and use it to open the attached ccs file. Then, click 'Save to Registry', exit and reboot comp. Test speeds again using the largest file 2992 KB and post.

Click 'Start' and 'Run' and type "cmd" in the pop up box and click 'ok'. A DOS black screen will appear. Type after the C: the following and press 'enter'. tracert www.testmy.net Then post the results.

Do a tracert to www.testmy.net

Any other electrical devices near your comp that emits EMI? A subwoofer has a hugh magnet within its casing. Even with power off, there is still magnetic effect. Keep it away from your modem and signal cables. Any other devices like cordless phone etc.?

This is the key to the problem: "Web100 reports the Round trip time = 1195.11 msec; the Packet size = 1460 Bytes; and No packet loss was observed. This connection is receiver limited 85.85% of the time. Increasing the the client's receive buffer (125.0 KB) will improve performance This connection is network limited 14.12% of the time." Something at your end (receiver) is limiting speed. This can be seen by the RTT value of 1195 ms. Under normal conditions, RTT (round trip time) should not exceed 300 ms if you are in USA. In many such cases, I will first look for line quality problem or electromagnetic interference on the signal processing devices - modem and router. Here are some interesting links of other people's experiences: http://www.testmy.net/forum/index.php?topic=11588.0 https://www.speedguide.net/read_articles.php?id=1885 https://www.speedguide.net/read_articles.php?id=117

The reason why testing speeds at far away sites do not show optimum performance is that signals from your comp have to travel through many internediate routers (called 'hops"). This will increase time delay and subject to unknown traffic jams at the intermediate routers. The better way is to test at websites nearer to you.

You have only posted the Summary. We need to see the 'Staistics' and 'More Details' reports. Click the 2 buttons below the test box and the reports will pop up.

Here are 3 speedtest sites in Australia: http://bandwidthplace.com/speedtest/ http://www.dungogtlc.org/speedtest.shtml http://www.cyberwizards.com.au/modemspeed