Anyone familiar with DMT v7 ?

bluetech · 29 Jun 2007 at 01:04

I am suffering from disconnects on my new Be* ADSL2+ Broadband. Started using DMT v7 for configuration of the BeBox (Speedtouch 780WL).

Would like to know what the graphs (specifically colours) relate to and what to watch for that may indicate high noise.

Thanks!

Wingz · 29 Jun 2007 at 01:17

can you post a screenshot of the DMT.

bluetech · 29 Jun 2007 at 01:24

Wingz said:
can you post a screenshot of the DMT.

Here we are. Ignore the low SnR for now, doing some tests with that at the mo... lowest SnR (can't adjust SnR up, only SnR down?). Filter to faceplate with phone and modem, no other anologue devices on the phone line (not that it would matter now I am in the test socket)

Ol!ver · 4 Jul 2007 at 22:11

Get anywhere with this? I'm getting disconnects too.

bluetech · 5 Jul 2007 at 13:07

Ol!ver said:
Get anywhere with this? I'm getting disconnects too.

Increasing the SnR seams to have stopped the droppouts (4 days no drops) but I have paid the price with slower speeds. I am trying to find a place in the middle between the best possible speed of 14Mbps and the lowest possible speed of 8Mbps.

Have you tried removing the ring wire from your telephone system?

I have done this because initially I was getting very slow speeds (6Mbps), transpires that the ring wire causes loads of excess noise on the line, slowing speeds and causing dissconnects.

Basically, using the tool, the higher the SnR the slower the speeds yet a lesser chance of dropouts. The lower the SnR, the faster the speeds, but the higher the chance of dropouts.

Ol!ver · 5 Jul 2007 at 18:34

bluetech said:
Increasing the SnR seams to have stopped the droppouts (4 days no drops) but I have paid the price with slower speeds. I am trying to find a place in the middle between the best possible speed of 14Mbps and the lowest possible speed of 8Mbps.

Have you tried removing the ring wire from your telephone system?

I have done this because initially I was getting very slow speeds (6Mbps), transpires that the ring wire causes loads of excess noise on the line, slowing speeds and causing dissconnects.

Basically, using the tool, the higher the SnR the slower the speeds yet a lesser chance of dropouts. The lower the SnR, the faster the speeds, but the higher the chance of dropouts.

How much difference does it actually make removing the ring wire? Makes the phones pretty useless mind

bluetech · 5 Jul 2007 at 21:19

Ol!ver said:
How much difference does it actually make removing the ring wire? Makes the phones pretty useless mind

The only phones it will affect are the old ones. Its job is to supply voltage to them. Nowadays we are using cordless phones, the base unit is powered separatley.

Basically, if you have a phone that plugs into the mains, remove the ring wire, if you have a phone that does not connect to the mains, leave the ringwire.

It made a huge difference for me. I use an ADSL2+ provider. with the ring wire installed and going through the master socket I found myself with 6Mbps. When I connected to the test socket I was getting 12Mbps, but connecting to the test socket disconnects all the extensions in the house. I removed the ring wire and went though the master socket (thus all other phone extensions were attached) and I was back at 12Mbps.

I have since upped the SnR due to dropouts and am now at 10Mbps and fingers crossed a stable connection with the SnR upped to 6dB to 13dB.

Try the following:

Connect your modem to the test socket (remove the faceplate if the master socket to do this, this will disconnect all of the extensions until re affixed).

If the speed is better (by 4Mbps or so, look into removing that ringwire), this may also resolve the dropouts. If not deffinetly look into upping the SnR, if you have a compliant modem, use the DMT tool to up the SnR. It looks to be working for me.

Let me know how you get on. And if anyone has any answers to my original post it would be appreciated but I think I am hopefully getting to the bottom of it now.

Ol!ver · 5 Jul 2007 at 22:04

bluetech said:
The only phones it will affect are the old ones. Its job is to supply voltage to them. Nowadays we are using cordless phones, the base unit is powered separatley.

Basically, if you have a phone that plugs into the mains, remove the ring wire, if you have a phone that does not connect to the mains, leave the ringwire.

It made a huge difference for me. I use an ADSL2+ provider. with the ring wire installed and going through the master socket I found myself with 6Mbps. When I connected to the test socket I was getting 12Mbps, but connecting to the test socket disconnects all the extensions in the house. I removed the ring wire and went though the master socket (thus all other phone extensions were attached) and I was back at 12Mbps.

I have since upped the SnR due to dropouts and am now at 10Mbps and fingers crossed a stable connection with the SnR upped to 6dB to 13dB.

Try the following:

Connect your modem to the test socket (remove the faceplate if the master socket to do this, this will disconnect all of the extensions until re affixed).

If the speed is better (by 4Mbps or so, look into removing that ringwire), this may also resolve the dropouts. If not deffinetly look into upping the SnR, if you have a compliant modem, use the DMT tool to up the SnR. It looks to be working for me.

Let me know how you get on. And if anyone has any answers to my original post it would be appreciated but I think I am hopefully getting to the bottom of it now.

I've ripped out the ringing wire and it's taken be from 6mb to nearly 10mb, which is nice. I'm on BE btw.

My only problem now is the disconnects I get at around half nine every night. It resyncs straight away at a lower speed. Then, at some point in the morning, it syncs again at the original faster speed. It's done this since I got activated a few days ago. Can't be the SNR can it? It did it at the default 6 on day one.

bluetech · 6 Jul 2007 at 17:21

You could try playing around with the SnR, it can't hurt. If you speak with Be* they will only do the same but force a higher SnR at their end. If you manually do it your end you will have more control over the fine tuning. Be* will have 6dB, 9dB, 12dB and 15dB and will take you down them untill there are no more dropouts.

Manually adjusting the SnR yourself will give you better control.

Use the DMT v7 tool (you have to go into options to allow the experimental tabs (SnR adjustments), but with my experience and the BeBox (Speedtouch 780WL), this is all fine.

I would suggest taking note of the following incase the worst happens:

Sign in here: https://www.bethere.co.uk/memberhome.do

Then go to support - bebox

However I have found the DMT v7 tool to be easy to use and work just fine as long as you don't "play", I only use it for adjusting the SnR at the moment, I don't play with the other parts I don't understand.

Once you have it all setup, push the SnR as high as it will go monitor it for a few days. If you don't get any dropouts, you know the SnR is the issue and some finer tweaking can be done to get the best speeds but with a high enough SnR).

Before this check the modem is in the master socket, and that all devices going into the telephone line are filtered. If the dropout is allways at a certain time, plug the modem into the test socket before this time and see if it drops thile in there. If it does, the SnR needs to be upped, if not then the problem is local (i.e unfilterd phone / faulty filter etc).

Hope this helps

Ol!ver · 6 Jul 2007 at 22:18

bluetech said:
You could try playing around with the SnR, it can't hurt. If you speak with Be* they will only do the same but force a higher SnR at their end. If you manually do it your end you will have more control over the fine tuning. Be* will have 6dB, 9dB, 12dB and 15dB and will take you down them untill there are no more dropouts.

Manually adjusting the SnR yourself will give you better control.

Use the DMT v7 tool (you have to go into options to allow the experimental tabs (SnR adjustments), but with my experience and the BeBox (Speedtouch 780WL), this is all fine.

I would suggest taking note of the following incase the worst happens:

Sign in here: https://www.bethere.co.uk/memberhome.do

Then go to support - bebox

However I have found the DMT v7 tool to be easy to use and work just fine as long as you don't "play", I only use it for adjusting the SnR at the moment, I don't play with the other parts I don't understand.

Once you have it all setup, push the SnR as high as it will go monitor it for a few days. If you don't get any dropouts, you know the SnR is the issue and some finer tweaking can be done to get the best speeds but with a high enough SnR).

Before this check the modem is in the master socket, and that all devices going into the telephone line are filtered. If the dropout is allways at a certain time, plug the modem into the test socket before this time and see if it drops thile in there. If it does, the SnR needs to be upped, if not then the problem is local (i.e unfilterd phone / faulty filter etc).

Hope this helps

Can't connect to the first socket, just not logistically possible I'm afraid.

I'll whack the SNR up a bit and see if that stops it. It's resynced at half nine now for all 3 days I've been connected, and someone on the BE forum from Sheffield, on a different exchange, is having it disconnect at that time too.

bluetech · 6 Jul 2007 at 22:28

Ol!ver said:
Can't connect to the first socket, just not logistically possible I'm afraid.

I'll whack the SNR up a bit and see if that stops it. It's resynced at half nine now for all 3 days I've been connected, and someone on the BE forum from Sheffield, on a different exchange, is having it disconnect at that time too.

See if what I mentioned above helps. Please keep me posted. I am having the occasional dropout to and upping the SnR certainley makes a difference, but I am still testing.

Ol!ver · 6 Jul 2007 at 23:44

Just had athought. To recap:

Between nine and ten I get a resync, and the speeds drop. I assume the SNR is dropping too low so the router is resetting. Would this be helped by either:

A: Using DMT Tool to RAISE the SNR so it had a higher starting point, so when it drops it doesn't drop far enough to retrain or

B: Using DMT Tool to DROP the SNR so it's not going to retrain because the lower SNR is above what it's looking for?

Not sure which is the way to go as I'm still fairly new to paying attention to line stats

ops:

Any help?

bluetech · 9 Jul 2007 at 17:48

Ol!ver said:
Just had athought. To recap:

Between nine and ten I get a resync, and the speeds drop. I assume the SNR is dropping too low so the router is resetting. Would this be helped by either:

A: Using DMT Tool to RAISE the SNR so it had a higher starting point, so when it drops it doesn't drop far enough to retrain or

B: Using DMT Tool to DROP the SNR so it's not going to retrain because the lower SNR is above what it's looking for?

Not sure which is the way to go as I'm still fairly new to paying attention to line stats ops:

Any help?

You and me both!

I would suggest after trying the whole filter / test socket thing first. If you have done this RAISE the SnR as far as it will go. Then it shouldent require a re-sync which causes a slower speed as it will automatically up the SnR I think.

I am still a little new to this. Anyone familiar with this please shine some light where you can.

Just to let you know, I had dropouts, raised the SnR right out... no more dropouts but slower speed. I am trying to meet in the middle by dropping the SnR.

Hope some of the above helps. Keep me posted on how it all goes.

Ol!ver · 9 Jul 2007 at 18:27

bluetech said:
You and me both!

I would suggest after trying the whole filter / test socket thing first. If you have done this RAISE the SnR as far as it will go. Then it shouldent require a re-sync which causes a slower speed as it will automatically up the SnR I think.

I am still a little new to this. Anyone familiar with this please shine some light where you can.

Just to let you know, I had dropouts, raised the SnR right out... no more dropouts but slower speed. I am trying to meet in the middle by dropping the SnR.

Hope some of the above helps. Keep me posted on how it all goes.

Can't work out why it does it at the same time give or take twenty mins with me though.

I've ordered some daddy filters today, should be here tomorrow.

bluetech · 10 Jul 2007 at 02:17

Hm, I am having a few issues with this DMT v7 tool. Or more likely it is the modem that is the issue.

Using the Speedtouch 780WL in conjunction with the DMT v7 tool. I set the SNR margin higher. It then resync's and shows 16dB and fluxuated between 15.5dB and 16.5dB. Now, this is the interesting bit. Slowly over time I notice the SnR getting lower. i.e 3 days later and I am now at 12dB.

Problem with the above is that I know I need to stay above 12dB in order to prevent dropouts. Dropouts have occured beneath 12dB.

My question is this,

How can I set the SnR in "stone"?

I have tried the save settings button. No joy. Anyone who can shed some light on this?

Thank you

Ol!ver · 11 Jul 2007 at 09:46

So whacked it up to some silly snr like 12 and the disconnect didn't happen. Looks like around half nine it's dropping to some low snr that's casing a drop out. Going to have to find an snr that gives it enough head room for the drop at night.

On a related note, anyone noticed that the slider in DMT Tool is a bit hit and miss? Lower the slider and the snr goes down, lower it another notch and it goes back up !

dovey · 11 Jul 2007 at 19:41

Could be some interference such as street lights switching on! Snr generally will drop at night, to do with the polarization of the sun or something like that.

Ol!ver · 11 Jul 2007 at 23:00

tested tonight with an SNR or 8db, still reconnected. I've noticed that tonight it's resynced at the same speed though, which it's not done before.

EDIT:

Just noticed the attenuation also drops from 47 to 43 at night.

Ol!ver · 13 Jul 2007 at 20:46

Just had to reboot my router cos it wouldn't let me at the internet, and it for some reason reset a load of options. Now I can't make DMT Tool connect. Just says port 23 isn't running a server.

bluetech · 20 Jul 2007 at 17:53

Ol!ver said:
Just had to reboot my router cos it wouldn't let me at the internet, and it for some reason reset a load of options. Now I can't make DMT Tool connect. Just says port 23 isn't running a server.

Try loging into the HTML interface and see if there is anything odd in here. By default just type 192.168.1.254 into your internet browser and use the default loging credentials (unless changed).

From here you can reload the manufacturers settings to get it back on line and perhaps re-enable the telnet service.