G.dmt on Netgear DG834GT

[halifax50]

On a number of posts in this wonderful forum I have seen references to G.dmt.

There does not appear to be any mention of this on the Netgear DG834GT router. Does anyone know where I can find it or something that relates to it?

[Squawk]

Your looking for modes of connection, others available are adsl2+, adsl2 and adsl, to name probably the three most common.

[halifax50]

Your looking for modes of connection, others available are adsl2+, adsl2 and adsl, to name probably the three most common.

Thanks Squawk for such a quick response. the only mention of adsl on the router status page is copied below:-

ADSL Firmware VersionA2pB022c.d20e
Modem StatusConnected
DownStream Connection Speed8086 kbps
UpStream Connection Speed443 kbps
VPI0
VCI38

[anthony]

On my DG834g v2, i could only change the mode through telnet,
dont know if the DG834GT is the same.

[markdyer72]

On my DG834g v2, i could only change the mode through telnet,
dont know if the DG834GT is the same.

unfortunately i do not know ov anyway that u can tell what it is connected at, i also have a DG834GT and have not found anywhere that says what mode is connected in, i think it just negotiates the best connection it can on boot up

[Jake]

if you use DMT tool, it will tell you what mode you are connected with, and give you your line characteristics. Great tool

[halifax50]

Thank you all for your input. Searched DMT tool and it did not appear as being available for this router only the Netgear dg834N.

Again thank you to you all. I have no problems and happy with connection but curiosity always gets the better of me, roll on holidays.

[markdyer72]

Thank you all for your input. Searched DMT tool and it did not appear as being available for this router only the Netgear dg834N.

Again thank you to you all. I have no problems and happy with connection but curiosity always gets the better of me, roll on holidays.



true i have had no problems with mine either, but true is the saying about curiosity i have messed up a few things via curiosity, but hey we live n learn. :D

[halifax50]

true i have had no problems with mine either, but true is the saying about curiosity i have messed up a few things via curiosity, but hey we live n learn. :D

:D I know, I certainly live but stupidly take a long time to learn, :D messed so many things up tinkering around. But if you (or I) find a way in the future please share it, maybe just one more little tinker!!! :s :D

[markdyer72]

:D I know, I certainly live but stupidly take a long time to learn, :D messed so many things up tinkering around. But if you (or I) find a way in the future please share it, maybe just one more little tinker!!! :s :D


certainly sir lol theres always enuff time for 1 more little tinker :) lol

[emjay]

There are ways to do it, some involve telnetting into your router, while others actually involve replacing the firmware with a non-netgear version, which gives more control of your router.

However, please note that both methods can seriously brick your router :eek:

Cheers
Mj

[bunnywabs]

This is for the DG834GT only AFAIK

First enable debug mode on the router by clicking:

http://192.168.0.1/setup.cgi?todo=debug

Then, in windows, Start -> All Programs -> Accessories -> Command Prompt

A black window will appear. Type the following commands one at a time into the window:


telnet 192.168.0.1
adslctl configure --mod d
adslctl info --stats


The output of the last command should be something like:


adslctl: ADSL driver and PHY status
Status: Showtime
Channel: INTR,
Upstream rate = 1024 Kbps, Downstream rate = 9184 Kbps
Link Power State: L0
Mode G.DMT - adsl1
Channel: Interleave
Trellis: ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 8.8 11.0
Attn(dB): 17.0 9.5
Pwr(dBm): 19.8 12.2
Max(Kbps): 10144 1316
Rate (Kbps): 9184 1024


The important line is the "adslctl configure --mod d" bit.
The last character forces the router to use a specific ADSL mode:

d = G.dmt
2 = ADSL2
p = ADSL2+
e = Router chooses (I think!)

Hope that helps.

:)

[Les The Gnome]

Halifax50: I downloaded the DMT program for use with my DG834PN. I believe the same version works with the DG834GT as well. The link I originally found was via Google - this is it (http://translate.google.co.uk/translate?hl=en&sl=de&u=http://dmt.mhilfe.de/&sa=X&oi=translate&resnum=2&ct=result&prev=/search%3Fq%3Ddsl%2Bmodem%2Btool%26hl%3Den%26newwin dow%3D1%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-GB:official%26hs%3D8eG%26pwst%3D1). As the site is German, Google translated the info; not perfect but good enough! The DMT site claims that v8.07 works with DG834GT although I've not tried it.

I started up the program (just runs as an application and doesn't need installing). The first time it runs, I chose Annexe A (what we use in the UK apparently), I also found that I needed to check the box for "special logon" in DMT, connecting to the default of port 23 seems to work. Of course change the IP address, login and password to suit and it seems to work fine for me. I must say I've only used it out of interest to read settings rather than change anything.

[Les The Gnome]

BTW, telnet is not available by default on Vista, certainly not in Vista Home Premium which I use. Dead easy to install it....

Control Panel, "Programs and Features", "Turn Windows Features on or off", click Continue, check the box for "Telnet client" then OK. It takes a little while to enable it. Then telnet is available from the command prompt as in bunnywabs' post.

[bunnywabs]

BTW, telnet is not available by default on Vista, certainly not in Vista Home Premium which I use. Dead easy to install it....

Control Panel, "Programs and Features", "Turn Windows Features on or off", click Continue, check the box for "Telnet client" then OK. It takes a little while to enable it. Then telnet is available from the command prompt as in bunnywabs' post.
Also, in Vista you will need to right-click on 'Command Prompt' and choose 'Run as Administrator'.

[trinity]

Halifax50: I downloaded the DMT program for use with my DG834PN. I believe the same version works with the DG834GT as well. The link I originally found was via Google - this is it (http://translate.google.co.uk/translate?hl=en&sl=de&u=http://dmt.mhilfe.de/&sa=X&oi=translate&resnum=2&ct=result&prev=/search%3Fq%3Ddsl%2Bmodem%2Btool%26hl%3Den%26newwin dow%3D1%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-GB:official%26hs%3D8eG%26pwst%3D1). As the site is German, Google translated the info; not perfect but good enough! The DMT site claims that v8.07 works with DG834GT although I've not tried it.

I started up the program (just runs as an application and doesn't need installing). The first time it runs, I chose Annexe A (what we use in the UK apparently), I also found that I needed to check the box for "special logon" in DMT, connecting to the default of port 23 seems to work. Of course change the IP address, login and password to suit and it seems to work fine for me. I must say I've only used it out of interest to read settings rather than change anything.

Did you do this mid February Les, as your downstream rate seems to have increased at around that time?

[Les The Gnome]

Did you do this mid February Les, as your downstream rate seems to have increased at around that time?

Ah, no. I've only been playing with DMT for a few days. As I used to work in IT before early retirement, I can't resist a tinker with some software now and then. :) I've not changed any settings in my router using DMT, just had a nose around the config especially at settings that you can't see or change with the standard router firmware.

February 2008 was when I discovered this forum. Soon after, Matt and colleagues tweaked my profile and up went the sync speed, without reliability suffering. I've had a big increase in reliability (during Jan I think) and a decent increase in speed this year. I'm one very happy gnome.... :D

[emjay]

Out of curiosity, I fired up the DMT Tool (v8.07) myself what it can tell me about my connection using the Netgear DG834GT. Looking at it, it appears that you can select what mode you want your router to use, and tweak it more, but not having used it for this, yet, I can't guarantee it will work.

One useful thing, is that it appears to give you a graph of your Downstream readings and at a glance, you can see if anything's wrong, or looks out of place. However, as I've just found out, the graph doesn't appear to go over 1MHz, so doesn't show for anything other than G.DMT.

Cheers
Mj

[peasepud]

emjay - for the graph to show beyond the 1meg you will need to be
on ADSL2+ as this uses a wider bandwidth.

I have a need to change modes from ADSL2+ (which a router reboot automatically selects) to ADSL2. My connection seems to be faster and more stable using ADSL2. The DMT tool does the job fine.

my downstream attenuation 44db - not really good enough for ADSL2+

{Router - DG834GT)

[emjay]

Just tried forcing it to ADSL2+, to recheck it, and discovered that it won't connect on ADSL2+, although it used to, hence why it never showed up before.

It can connect on ADSL2, which, I believe also runs in the 1 - 2MHz bracket, so the DMT Tool should be able to pick this up, but still doesn't show above 1MHz on the graph. Did you have to do anything special to make it work?

[bunnywabs]

Just tried forcing it to ADSL2+, to recheck it, and discovered that it won't connect on ADSL2+, although it used to, hence why it never showed up before.

It can connect on ADSL2, which, I believe also runs in the 1 - 2MHz bracket, so the DMT Tool should be able to pick this up, but still doesn't show above 1MHz on the graph. Did you have to do anything special to make it work?
ADSL runs over the same frequency spectrum as G.dmt...up to 1.1MHz or so. ADSL2+ is the only ADSL modulation that uses frequencies above that.