In reply to a post by cosmicflame1:

To be honest I haven't put this forward to support (I assume you mean phoning them?) but I have phoned O2 on other matters and they're very nice and UK based, not like Virgin's foreign centres, ugh.

Also, (not intending to insult your intelligence) but are you sure I can phone O2 about my SN Margins and get them sorted? Because I read (http://community.plus.net/blog/2007/10/05/snr-margins-what-and-why/) that changing them is a very complicated matter.

Also, off topic but does BE have a trial period like O2? Because this trial period is the only reason I'm swaying towards O2, I can't seem to find one in BE but it might be in the fine print?

Again, I can't speak for O2, but with Sky, things like this can usually be fixed by phoning and asking for "tier 2" support, or by emailing them with your stats and your complaint and they can adjust it.

And keeping the router on *should* help with your SNR and line capping/DLM. If you are having constant problems maybe you should ask them for a replacement router.

If it was speed issues you were having it may have been high contention or a traffic management issue.

O2 doesn't have a DLM of the kind described. They do have a DLM that they run for the first 2-3 days, then it is switched off. Same with Be - it's the same DLM.

From your description of the O2 problem, and the stats you posted earlier, it seems you were getting greater than 6dB variation in margin, which caused you to get a disconnection and then a reconnection at a low speed. That resets the margin to the nornal 6dB. Then the noise goes away and your margin rises to 13dB. So your restret then set it back to 6dB at a high speed.

You might find my explanation of noise margin helpful.

In reply to a post by RobertoS:

From your description of the O2 problem, and the stats you posted earlier, it seems you were getting greater than 6dB variation in margin, which caused you to get a disconnection and then a reconnection at a low speed. That resets the margin to the nornal 6dB. Then the noise goes away and your margin rises to 13dB. So your restret then set it back to 6dB at a high speed.

You might find my explanation of noise margin helpful.

I don't really understand, and I did check out your link -nice website.

From what I gather having a lower margin gives you a less stable but faster connection? So turning my router off and on my router means that increased it, resulting in lower speeds? What's this about resetting it back to 6? How can you do that? Pin-hole reset?
IF not, I can just phone O2 up and they can do it easily/it won't take a lot of time?

If the ISP systems raised the target value to above 6dB, then it is call them to reduce it.

NOTE: If it does this a lot then you should look at the wiring in the home to try and stop this happening.

In reply to a post by MrSaffron:

If the ISP systems raised the target value to above 6dB, then it is call them to reduce it.

The O2 DLM is turned off after 1-2 days from initial connection. (The stats indicate LLU).

They are also horrendous. Possibly no filters anywhere when on O2, and maybe also now on VM Cable?

What do you mean by filters?

And are you saying that after 1-2 Days the DLM is turned off and the SN Margin is fixed? Or can you still call them to change it?

In reply to a post by cosmicflame1:

What do you mean by filters?

When you were on O2, in the modem box there were two things that looked like the XF-1e here. Those are filters. Did you use one at all?

Does anything similar come with VN Cable?

And are you saying that after 1-2 Days the DLM is turned off and the SN Margin is fixed? Or can you still call them to change it?

Most ISPs use BT Wholesale services. That has a DLM that runs for ever and does wierd things to the connection-time noise margin.

LLU connections such as your O2 one don't use that BT Wholesale service. So they have their own DLM, and yes, in the case of O2 they turn it off after a couple of days.

The connection time margin is basically fixed, but it can be manually altered by O2.

After you connect at whatever "connection time margin" has been set, the noise margin will change a bit during the day and often quite a lot at night. That's because the actual noise changes. It's noisier at night than in the day, for lots of reasons.

Edited by RobertoS (Fri 02-Mar-12 21:20:41)

Cool I read that changin the SN Margins doesn't take that much effort, you simply phone them up ad they'll do it.

And lol yup I read about noise increases on your website