Many different modem models show an estimated maximum attainable sync speed on the GUI pages, but the Speedstream modems do not include this capability. The Speedstream 5100b/4100/4100b modem analysis tool (aka DMT tool) programmed by deblin  can estimate the upload/download maximum attainable sync speeds for a line if provided with a link to a saved copy of the Technician Readout page on the user's hard drive. The 5100b/4100 modem must be using software version 1.0.0.53 to provide the complete results for the upload side. The 4100b modem uses the factory 1.0.0.63 software.
To save a copy of the Technician Readout page, »192.168.0.1/techreadout.htm, with a non-IE browser, simply use the Save as command. If you are using any version of Internet Explorer, then after using the Save as command, you must change from the default setting on the Save as type: drop down box to the Web Page, HTML only (*.htm,*.html) choice and then save the Technician Readout Page.
On IE, alternatively you can use the View -> Source menu item on the Technician Readout page. This will open up the HTML source in notepad (or whatever your default text file viewer is). Save this file as "techreadout.htm" (the file name doesn't matter).
These estimates will under report the actual maximum attainable sync speeds if the modem is not running at full output power. Because these modems do not report the output power levels, there is no way to compensate for this possibility.
Also note at the slower speed plans such as 1536/384, the modem only lists the statistics for tone bins (frequencies) it is using. So the speed estimates made from limited tone bin data tend to be slower than the real potential of the line.
The chart below (click for full image) was produced by the modem analysis tool for a good 1536/384 connection on a relatively short loop. It is an extreme illustration of the limits of these maximum attainable speed calculations. This line was only running at about half output power and no data is reported for the higher tone bins. AT&T techs estimate the line's maximum attainable sync speed at 6976 kbps instead of the tool's estimate of 5128. Had the modem been running at full output power, the two estimates would have been much closer in agreement.
If you are asked to post the tool's results in a thread and you don't have the ability to make a graphic capture such as the above shot, then you can post a copy of the DMT chart link address (with Firefox you right click on the chart and 'Copy Image Location' and with IE you right click on the chart, select Properties, and then copy the entire Address:(URL)) and a simple cut-and paste of the text such as done below. This will make viewing your results much easier for those reading your thread:
»/users/deblin/···aph=true
Downstream Maxrate (Estimated): 5328
Upstream Maxrate (Estimated): 844
Bit tones with notches/missing bits:
bit(s) 38:47 163.875 - 207 KHz
bit(s) 65 280.3125 - 284.625 KHz
bit(s) 144:148 621 - 642.5625 KHz
bit(s) 163 702.9375 - 707.25 KHz
bit(s) 172:255 741.75 - 1104 KHz
Note: This DMT tool now works for the Motorola 2210 modem as well as the Speedstream 5100b, 4100, and 4100b modems. Follow the above instructions, but for the 2210 modem save the Technician Readout page from »192.168.1.254/techreadout.htm instead.
The upload tone bins (the leftmost group) for the 2210 modems are not shown on the DMT chart because they do not list that data in their techreadout pages. The maxrates listed by the DMT tool for the 2210 modem are those actually reported on the modem's techreadout page.
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by d_l
last modified: 2008-09-12 09:45:32 |
