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[divybc]

Hello guys. I have been wandering this forum for a while and think it's time for a post and would appreciate some advice!

I recently had what I believe is DLM kick in on the line as I was tinkering with a few all in one modem routers.

After that didn't go well, I decided to chase perfection and go with the HG612 which I picked up on Gumtree locally for a fiver!

Got it set up with an Asus RT-AC68U and I got the line stats shown above.

My question is, I was always synced at 80/20 and now as you can see I am down to 73/20. How long is this process of getting pushed back up in experience? What should I avoid doing? Any tips or is it just going to happen in time?

Also, last quick one is that I see I have like 500 and 500 FEC errors there within 2hrs. Looking at these stats and your experiences, would I be quick to get back to my old sync speeds?

Thank you.

[NEXUS2345]

This looks strange to me. You have G.INP applied, so the parameters look fine to me for a line which has it enabled. The FEC errors if I understand correctly are errors that would have occurred, but were prevented by the G.INP. I can't really explain the sudden reduction in sync speed, but I would advise trying to power down your modem for 30 mins, then powering it back on and see what the stats are then. One thing I would note is that the rate of 72998 on the downstream suggests some sort of banding to me may be possible, but I wouldn't know without looking at the stats previous to the HG612 being installed. As you said you had been playing about with other AiO solutions, it may be possible DLM hit you with banding, in which case you may see it fix itself over time (possibly up to a couple of months) or you would require a DLM reset. I would wait for burrakucat or ejs to take a look though, as they have much better insight.

[divybc]

Thank you for the response.

I do think it's banded due to the amount of restarts I was performing with the AiO kits. As I said, I was on 80/20 for months on end before I had that spell of messing about due to Sky's hub being atrocious for port forwarding, dns changing, not applying dmz correctly, no QoS, poor wifi and the list goes on.

I did enquire to them if they could get me a DLM reset, but I was sure they were going to knock it back and sure they did. They told me OR won't entertain it unless my speeds are way under 60Mb.

I am due a master socket relocation, but Sky told me the engineer is an installer and therefore won't be able to call back to OR for a reset. Guess it's just a waiting game.

As for leaving it of for 30 minutes, I tried this earlier today with no joy, still syncing in at 73.

Any other insight on top of what you said from anyone else is appreciated.

[NEXUS2345]

There are 4 types of engineer from Openreach I believe. General, Broadband, Underground, and REIN. A general Openreach engineer should be able to do a DLM reset, although I am not sure of this, so maybe Black Sheep could give some insight? They do also have contractors, but they are generally only used for either first installs (not sure how often in this case) or on bulk installs on new builds I believe.

[divybc]

I guess it's a general engineer I'll be getting then.

What's weird is I had an engineer for a supposed fault in the copper joint according to Sky's line test on the 22nd. The engineer was a broadband guy and visited out the blue later that day.

He ran tests at the master socket and found nothing at all, in-fact he said my line is really good. I asked him at this point for a DLM reset and even though he was a really nice guy he told me that as his jobs notes say, he can't reset the DLM unless he has fixed a fault.

[divybc]

Don't know if anyone could tell me this here, but would I need to disable NAT on the HG612 as it's already enabled on the router? I believe this is known as doubt nat. Correct me if I'm wrong please, bit of a noob at this.

Cheers,

Dave.

[divybc]

Ignore the above. I am learning some more lol. The router shows my public ip and not a private ip and as the modem is in bridge mode we're all good.

Learn something new every day

[Ronski]

Engineers  are only allowed to reset DLM when fixing a fault, and I think only specific faults,  as I understand DLM resets are only allowed under exceptional circumstances and are monitored, so an engineer requesting one will get in trouble if not done for a good reason.

You still have very good speeds, and have G.INP enabled, I suggest you just enjoy the connection and don't worry about the small drop.

[divybc]

Thanks for clearing that up Ronski.

I had a resync at 7AM this morning as shown my hg612 stats, supposedly retrain reason 1 which pushed my interleaving to 16/8. It also put me from 73998 sync to 74000 lol.

I guess its slowly working its way back up?

I will try to enjoy my speeds, but I'm so used to seeing over 70 on the speedtests.

[j0hn]

From the downstream snrm of 9.8dB and the exact sync figures, you're line is definitely banded by DLM at 74mb. Constant restarts of multiple modems is exactly the kind of thing that causes banding. Recent experience is that banding by DLM sticks, and requires an on site OpenReach engineer to perform a DLM reset. The engineer will only be able to obtain 74mb while testing at the cabinet so the issue should be easy to diagnose, IF you manage to get an engineer booked. ISP's often won't send an engineer for banded lines if the banding is above your low estimate.

[Ronski]

It's unlikely apart from speed tests that you'll notice any difference, my speed has fluctuated between 38 and 55 in the 4 years I've had it, and recently I took a hit on download dropping from 55 to 48 to gain 2Mbps on the upload (different modems).

Yes there is something odd (as pointed out by John most likely banding), given your attainable and SNRM you should be getting 80/20, but for 6Mbps it's really not worth the hassle trying to get it sorted out, given time it may sort it's self out. As long as it doesn't get worse just sit back and enjoy, it's far to easy to get fixated on these things.

[gt94sss2]

There are different types of banding - as DLM is resyncing the line to a slightly higher speed and quoting a retrain reason 1  - I would leave the line alone for a few weeks..

With the more permanent type of banding the sync speed would never increase after a retrain.

No real point asking for an engineer - unless you want to risk the possibility of a charge as BT engineers have been told not to carry out DLM resets unless they find and fix a fault.
 

[divybc]

Appreciate all the replies guys. Really helpful info and makes a lot of sense.

The thing I was told with Sky is that as I am in contract I will never pay for an engineer if they send them out. As mentioned by John I guess if he tested 74 at the CAB then he should be able to get away with doing it.

It may all work out tomorrow as I am due some type of engineer for a socket relocation. If it retrained at 7AM and put it up a little bit, it may in time just do it itself as mentioned.

[ejs]

Why would anyone bother with going to the cab to test the speed there? Anyone can see it's banded from the profile reported in the line test results.

I thought some ISPs had their own engineers or contractors to do internal and master socket work, so you might not even get an Openreach engineer.

[divybc]

I mean I guess that's true, but I will see what happens.

If it's not openreach doing the work tomorrow then I guess I'm not too bothered. I was just hoping for a little more insight which you guys have given me.