Try installing the Vector4 firmware instead of the BT one. Works for me on lines where it starts resyncing on a regular basis.

In reply to a post by j0hn83:

Can you post the SNRM graph from the same time.
That's a huge drop in the attainable on the graph but it has gone back to normal now.

DLM counts ES, not CRC's.
Both are low for a line running fastpath.
DLM allows up to 2880 or 1440 ES (depending on the DLM profile your ISP uses) per 24 hours of uptime before taking action to stabilise the line (interleaving). You're well short of that.

Hi John,

Thanks for the info.

Unfortunately, that was one of the first days i had installed DSL Stats and didn't have the snapshots set up properly.

Having said that, so far things have been reasonably stable!

In reply to a post by jabuzzard:

Try installing the Vector4 firmware instead of the BT one. Works for me on lines where it starts resyncing on a regular basis.

Thanks.

One of the guys on the Draytek forum posted an alternative MDM2 firmware for me to try.

However, at the moment i'm running a Zyxel modem so that i can monitor the connection with DSL Stats.

Once everything is settled, i may drop back to the Draytek and give it another go.

Did that drop coincide with a landline phone call? That would be normal.

Though the drop in both actual and attainable upstream at the end suggests a re-sync. But the downstreams reverted to previous. Capped?

In reply to a post by RobertoS:

Did that drop coincide with a landline phone call? That would be normal.

Though the drop in both actual and attainable upstream at the end suggests a re-sync. But the downstreams reverted to previous. Capped?

Just gone back through my fault ticket and yes, that was the day an engineer was supposed to do a lift and shift but didn�t.

Three hours later I went out and found him in his van parked up at the end of the road relaxing.

Having read through the firmware update notes I get the feeling that what has happened is that the modem code went through the illegal BT SIN 498 approval process and Draytek have been pushing that as the default in the UK. Meanwhile the modem code has undergone further improvement but in the UK they are sticking with the illegal BT SIN 498 code by default because of the significant cost of putting the new modem code through the illegal BT SIN 498 certification process.

Looking at the notes on the UK and other Draytek sites around the world the latest option for the modem code is the Vector 4 (579F17) firmware.

For a while I had just stuck an ECI Openreach modem in the way on WAN2 (just what I had to hand), to overcome the issue but with the new firmware 3.8.9.4 firmware that came out at the beginning of March I decided to try it with the Vector 4 firmware as it has both G.998.4 and G.998.5 support (aka G.INP and vectoring).

Before the upgrade I took out the ECI Openreach modem and tried it on the 576D17 firmware for the illegal BT SIN 498 and it was still giving issues with dropping sync every few minutes. It was on the 3.8.9.3_BT firmware at this point. I loaded the Vector 4 firmware and rebooted. It's been up for about a week now without dropping sync.

Read from this what you will, but my take away is if you are having problems with a Draytek loosing line sync switching to the Vector 4 firmware should be your first port of call. Certainly looks to have worked for me. Well for my sister I use an Edgerouter X-SFP with UniFi AP-LR and a HG612-3b, both powered via 24v passive PoE from the Edgerouter.

Please could you tell us what is illegal about SIN 498?

Because we are still in the E.U. While we remain members of the E.U. it is against E.U. law for a telecommunications operator to run a compliance scheme like this. BT/Openreach do not have the legal authority to run such a scheme with the threat of disconnection for equipment that does not meet their specification.

Simply put it's not much of a single market if every telecommunications operator in the E.U. is running their own certification scheme. As such certification is now done at an E.U. wide level. There is no if's and no but's it's illegal.

Which EU law, regulation or directive is that please?

Well first off some common sense tells you that it is not much of a single market if you say make a telephone, or modem etc. and have to have it approved in every single country of the E.U. Freedom of movement of goods, people, capital and services are the four fundamental pillars of the E.U. If I cannot freely move my VDSL router from Germany to France to the UK then the single market is broken. All those E.U. directives are about removing the barriers to those fundamental freedoms.

Secondly some more common sense would say "What happened to all those green BABT approved stickers?" The short answer being this is now all handled at an E.U. level and a national sticker standard was not compatible with the single market and was consequently terminated.

However specifically 1999/5/EC, 2002/21/EC, 2014/53/EU and 2017/1354 covers it.

It will all shortly be moot, but right now the threat of disconnection is illegal. It's perfectly permissible for BT/Openreach to have a testing program for equipment to ensure it works optimally with their network. What they cannot legally do is threaten or actually disconnect you for not using equipment tested by themselves. As they do threaten disconnection BT SIN 498 is illegal under E.U. law.