IP profile lowers each time modem is powered down.

To clarify, before anyone says it, I know it's not a good idea to mess about with the Openreach modem, so I don't so this regularly.

I've had fibre since May. I started off with a 77.44 Mbps profile which I believe to be the highest possible.

I first powered it off in August when we went on holiday for a fortnight, I don't like leaving routers etc. on when away for so long. When we got home I powered everything back up and noticed I had lost a little off my profile,which was now 76.78 Mbps.

Now this week, I lost the connection, long story, but after following advice to reboot the modem, my connection came back up with an IP profile of 70.91 Mbps.

As far as I know, the line has been solid, even when I had the original higher profile, so why does it drop each time I have powered down the modem? Am I likely to ever get the higher profile back?

N.B. I've learnt my lesson and don't intend to power it down next time I go on holiday!

The first drop was so small that it wasn't significant. Any reconnect will depend on line details at the time of the reconnection, and these can easily vary by that sort of amount.

The more recent loss may be because whatever caused your disconnection made DLM (digital line management) see problems, and lowered your speed to try to give a you a stable line that overcomes the problems. If that is the case, and if the underlying cause has gone away, DLM will probably let you back to the original speed or very near. It can easily take two to three weeks, but is sometimes quite quick.

It is a good idea to disconnect/reconnect (web interface) or reboot the ROUTER each morning during this period. DLM generally schedules any speed increase in the middle of the night. Sometimes the low level speed increase is not seen by the higher level exchange/router connection, and your IP profile is not increased to match the new faster sync speed; the reconnect will force an update of the IP profile to match sync speed.

In reply to a post by StephenTodd:

DLM (digital line management)

I thought the acronym stood for dynamic line management.

So do Openreach http://www.openreach.co.uk/orpg/home/products/produc...

In reply to a post by David_W:

In reply to a post by StephenTodd:

DLM (digital line management)

I thought the acronym stood for dynamic line management.

Thanks for the correction -- I'll try to remember

In reply to a post by David_W:

In reply to a post by StephenTodd:

DLM (digital line management)

I thought the acronym stood for dynamic line management.

Hehe. Not only that, but it is of course operating on an analogue line .

Edited by RobertoS (Sat 23-Nov-13 23:33:15)

Just to clarify, I didn't explain very well, the connection didn't drop, BT cut me off, so instability wasn't the reason for the loss of connection.

So the profile can pick up without having to disconnect the modem, if I just try rebooting the router every so often is that correct, but it can take 2-3 weeks. I hate not being able to see the line stats like I could with ADSL.

One reason your connection is getting slower could be increased takeup by your neighbours which results in increased crosstalk. This is why BT are looking at vectoring as a solution for the problem.

Ah OK. Thanks.