DSL Analysis Tool

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dgashby

71 posts

Master Geek

#18320 6-Jan-2008 16:25

Hi,

My ISP recently recommended the following tool (DMT - http://dmt.mhilfe.de/) for obtaining a detailed anaylsis of my phone line. There are several version available depending on which DSL modem you are using. I managed to find a version that works with my LinkSys modem even though it isn't mentioned in the list of supported modems. Unfortunately the forum pages for the application are all in german so deciphering the results is a bit tricky. I've included a screen capture below:

DMT Screen Dump

I'd be intrested in comparing results with others, and comments from anyone who knows how to interpret the graphs above.

Cheers,

Dean

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904 posts

Ultimate Geek

Trusted

#103215 6-Jan-2008 22:10

The first graph shows which tones are used and how many bits in each tone are being used, and the second one shows the SNR on each tone.
I think it is good to have high numbers throughout the graph, indicating a good sync?
Not sure what the last one displays, something to do with the line length, as there's an estimate on the bottom right.

EDIT: updated image with error data.

hellonearthisman

1819 posts

Uber Geek

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#103216 6-Jan-2008 22:12

Site in Google Engligh

The infomation looks intersting, I'm going to look at the xp version DMT v9.01 - Windows2000/XP/Vista

matt1553

30 posts

Geek

#103298 7-Jan-2008 11:46

Looks like a rather useful tool. This is the result I get with my RTA1320 modem approx 1.5km from the exchange (by road) with Xnet FS/FS plan. The "estimated loop length" in the bottom right of the grey graph seems reasonably accurate and useful. The v8 edition of this tool looks to support the most commonly available modems in NZ. I didn't know that the level of detail on the conection that is displayed was available through telnet! Couldn't get it to work with my AM300 modem (no telnet).

billgates

4705 posts

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#103339 7-Jan-2008 14:44

The biggest secret to this tool is that, it can change the SNR margin of your line. There is a hidden option in there which lets you increase/deacrease your sync rate (which you have to choose and tell it, that what sync rate you connect at) and it changes the SNR margin according to that. Bought my SNR margin down from 12db to 6db and it increased my sync rate by 1000kbps. Been using this software for months. Although when you resync the modem with the software, it works but as soon as you physically reboot the modem, all the settings go back to default.

ps - my speedtest did increase from 5Mb/s to 5.2Mb/s after resyncing the modem with the software and genereal download manager speeds were little bit quicker as well.

Do whatever you want to do man.

filch

1 post

Wannabe Geek

#103389 7-Jan-2008 17:58

Is there nstructions for this tool somewhere? What server are you supposed to be connecting to?

TIA

Dave

cokemaster

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#103390 7-Jan-2008 18:00

billgates: The biggest secret to this tool is that, it can change the SNR margin of your line. There is a hidden option in there which lets you increase/deacrease your sync rate (which you have to choose and tell it, that what sync rate you connect at) and it changes the SNR margin according to that. Bought my SNR margin down from 12db to 6db

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hellonearthisman

1819 posts

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#103449 7-Jan-2008 21:12

I have not had much time to play with this.

I think they are connecting to (loging into) their modems.

But I could be wrong, a few settig tips would be great.

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dgashby

71 posts

Master Geek

#103485 7-Jan-2008 23:43

In my case DMT tool logs into my ADSL modem via telnet and runs the adslctl command. My modem is a LinkSys WAG325N, it's a combined wireless-N ADSL2+ router with VPN enpoint support. The modem is basically running an embedded version of linux. The web interface doesn't report as much detail as my old Dynalink RTA770W did but by using DMT or the adslctl command directly I get a lot more detail.

What is surprising to me is that my performance actually dropped by about 2-5% when our local exchange (Burwood, Christchurch) was switched over to ADSL2+. My downstream line attenuation went up from 41 to 44db. I've got an internal hard-wired splitter - this was well worth the $$, it was fitted before the switch over to ADSL2+ and took my old ADSL1 attainable rate from about 2Mbps up to over 4Mbps. I'm about 2km by road from the exchange, the roadside cabinet I connect to is about 150m down the road and due for cabinetisation in July next year :( For anyone that hasn't seen yet, Telecom's UCLL site has quite a bit of detail, including GIS files outlining which cabinets are ear-marked for upgrading, and which area they cover.

The comment about modifying the SNR doesn't appear to be a crazy as it sounds, I haven't tried it yet but came across the following http://www.digitalspy.co.uk/forums/showthread.php?t=508793 in a UK forum.

Still waiting for someone to upload an example analysis from an ADSL2+ connection...

billgates

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#103546 8-Jan-2008 12:03

cokemaster:
billgates: The biggest secret to this tool is that, it can change the SNR margin of your line. There is a hidden option in there which lets you increase/deacrease your sync rate (which you have to choose and tell it, that what sync rate you connect at) and it changes the SNR margin according to that. Bought my SNR margin down from 12db to 6db

No offence, but have you tried it? NO

Have I tried it, YES
Have others I know tried it? YES

According to the fundamentals of DSL telchnology, IS this possible? YES

Please follow this NZ thread from page 1 to page 4

http://www.gpforums.co.nz/showthread.php?s=9302a69f663ea5a4b2fc9b1a9efe994d&threadid=294630&perpage=25&pagenumber=1

In No of cases, ~ 10% users experience CRC errors and disconnections but majority had their sync rate increased and a majority from that bunch also experienced speed increases.

Do whatever you want to do man.

cokemaster

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#103557 8-Jan-2008 12:49

Messing with DSL parameters can result in additional errors, drop outs, and other goodies.

Remember not to blame your ISP when you start experiencing those issues.

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billgates

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#103561 8-Jan-2008 13:01

cokemaster: Messing with DSL parameters can result in additional errors, drop outs, and other goodies.

Remember not to blame your ISP when you start experiencing those issues.

You are correct there and it did happen with few users but it was only about 10% of the users who experienced disconnections. It has been working like a charm for me. You should give it a try, It might be very good or very ugly. If it turns out to be ugly then just reboot the modem, and all settings will be back to normal.

Do whatever you want to do man.

Spyware

3771 posts

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Lifetime subscriber

#103571 8-Jan-2008 13:37

dgashby:

What is surprising to me is that my performance actually dropped by about 2-5% when our local exchange (Burwood, Christchurch) was switched over to ADSL2+. My downstream line attenuation went up from 41 to 44db. I've got an internal hard-wired splitter - this was well worth the $$, it was fitted before the switch over to ADSL2+ and took my old ADSL1 attainable rate from about 2Mbps up to over 4Mbps. I'm about 2km by road from the exchange, the roadside cabinet I connect to is about 150m down the road and due for cabinetisation in July next year :( For anyone that hasn't seen yet, Telecom's UCLL site has quite a bit of detail, including GIS files outlining which cabinets are ear-marked for upgrading, and which area they cover.

I'm on Belfast exchange, attenuation changed from 29 dB before to 34 dB (indicates 2.5 km) after change to ADSL2+. Physical distance is 1.8 km. ADSL1 sync was always 8 Mbps, ADSL2+ between 10.5 and 11.2 using Belkin 9630 (DMT doesn't work).

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cokeman2

919 posts

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#105809 20-Jan-2008 15:59

has anyone got this tool working with the wag54g V3 ?

i get it conneted then a "unknown command Router (1mmain (m)" comes up

?

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Spyware

3771 posts

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Lifetime subscriber

#105811 20-Jan-2008 16:13

wag54gv3 uses Texas Instruments TNETD 7200+1350+3422+3427 chipset. Need Broadcom 6338/6348 etc.

Spyware

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#108543 4-Feb-2008 18:48

dgashby: In my case DMT tool logs into my ADSL modem via telnet and runs the adslctl command. My modem is a LinkSys WAG325N, it's a combined wireless-N ADSL2+ router with VPN enpoint support. The modem is basically running an embedded version of linux. The web interface doesn't report as much detail as my old Dynalink RTA770W did but by using DMT or the adslctl command directly I get a lot more detail.

So I have my WAG325N, rolled back firmware to A1.00.08, 2007-04-16 to get telnet working. DMT v8.07 logs in but says doesn't recognise modem type.

What firmware version are you running dgashby?

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