Interleaved after service change - normal?

Does anyone know if its normal to have interleaving applied when switching packages?

I moved from BT Infinity 1 (Up to 55Mbps) to Plusnet Fibre Extra (Up to 80Mbps)

Since the migration my pings have gone from 10ms to 18ms and my max sync has gone up too.

No re-syncs occurred. Line has been stable.

Sadly i can't check if interleaving is enabled as my modem TP-Link W9970 doesn't have detailed stats. But its rock solid and on a FP BT connection i never had any errors, they always reported 0.

thanks

To be expected when going between products (and also happens to me when migrating) DLM may remove interleave over time again, or apply G.INP or other tweaks if Huawei DSLAM

If you went from 55 to 80 then there will have been a resync at that time

In reply to a post by MrSaffron:

To be expected when going between products (and also happens to me when migrating) DLM may remove interleave over time again, or apply G.INP or other tweaks if Huawei DSLAM

If you went from 55 to 80 then there will have been a resync at that time

Thank you

That cleared it up for me. Yes i did have a resync on the switchover, but i left it well alone and let it get on with it.

With it being 3rd party modem/router, BT cut off at 4am. Logged a load of auth errors, but was synced with a different actual and max... switched the credentials over and it came online around 1pm.

Solid ever since. Glad to hear interleaving it typical in this case. I shall wait until its removed and get some sync back. Thanks

Edited by oldskool (Wed 23-Jan-19 17:37:29)

Something similar happened to me a couple of years ago when I moved from PN to IDNet. It went from 65/19 (where it had been for several years) down to 55/19 - the first time I'd ever seen it below 60. Stayed that way for six months then, in slightly odd circumstances, jumped back up one Saturday afternoon and has been there ever since.

Edited by Andrue (Wed 23-Jan-19 20:23:09)

Yes, Huawei lines default to interleaving then G.INP, ECI fastpath then interleaving if needed.

Maybe G.INP was activated? Are you connected to a Huawei cabinet?

In reply to a post by WilliamGrimsley:

Maybe G.INP was activated? Are you connected to a Huawei cabinet?

Yes, I am. What struck me as a bit odd about it was that it took so long for the line to recover back to where it had been for several years previously. I can only assume that the DSLAM threw away its historical information about my line when I changed ISPs.

The other thing that was odd was how and when it recovered. I started a large upload (several hundred gigabytes) then went out for the afternoon. About 15 minutes into the upload my connection dropped and the modem (my original HG612) was unable to re-establish it. I had to power cycle the modem to get the connection back at which point it was running at its original speed. The thing is that's probably the only time my VDSL connection has dropped during the day in the many years I've had it. Other than forced retrains the only other drops I've seen have been the usual early hours DLM and of course the modem always recovers from those in seconds.

Odd

Maybe a crosstalker was connected, then disconnected, but your line didn't pick up the original rate until you resynced the modem?

In reply to a post by WilliamGrimsley:

Yes, Huawei lines default to interleaving then G.INP, ECI fastpath then interleaving if needed.

Both Huawei and ECI lines default to interleaved on DLM resets now.

Ooh really?! When did that happen? Kind of makes sense, I suppose.

In reply to a post by WilliamGrimsley:

Maybe a crosstalker was connected, then disconnected, but your line didn't pick up the original rate until you resynced the modem?

Could be. Odd that it dropped in the middle of the day though. The only known instance in nearly seven years. Just..odd

It was announced last February, and gradually became the default.

https://www.ispreview.co.uk/index.php/2018/02/openre...

The article is quite poorly written (sorry Mark) as it makes no mention of the fact Huawei lines already did this (more than half the FTTC lines).

I believe interleaving is now the default for all new provisions, all DLM resets and for migrations that result in the DLM being reset. Not all migrations reset the DLM
This is the case for both ECI and Huawei lines.

With Huawei lines with a modem which supports it G.INP is applied on day 2.
If the line is stable DLM can drop the SNRM target to 5dB, 4dB then 3dB on days 4, 6 and 8.
This can occur over months for lines with higher error counts, not at all for others, or somewhere inbetween (some stick on 4dB or 5dB).

With ECI lines DLM will move a stable line to fastpath after 2 days.
It can take longer for noisier lines.
Many lines will stay interleaved.

Edited by j0hn83 (Fri 25-Jan-19 00:10:04)

In reply to a post by j0hn83:

With ECI lines DLM will move a stable line to fastpath after 2 days.
It can take longer for noisier lines.
Many lines will stay interleaved.

Thanks John

I was moved from bt to pN on Monday and to the higher speed package

My line is on an ECI cab and I�m interleaved

Sadly I still am. No resyncs. And my SNR has not moved at all from 6.3db

My max rate has stayed solid and there have been no errors logged.

Even on bt Fastpath I never had a resync so afaik my line is clean and stable

Just strange to see I�m still interleaved if it�s meant to switch after 2 days

I have just had a long rural line moved from ADSL to VDSL on a Huawei cabinet so DLM is still settling.

I noted 151/0 Interleave Depth for the first day in DSLStats. At the first midnight it resynced the modem at 129/0 Interleave.

I am still at downstream INP 3.00 and G.INP disabled but will watch what it does overnight until it stops changing.

Edited by DanielCoffey67 (Tue 29-Jan-19 17:19:10)

I wish mine would resync

The modem has been connected for just over a week now, when it moved from BT to Plusnet and without resyncing since DLM reset and the modem connected for the first time.

I can't see my interleaving stats, but my pings are around 9m higher than BT.

I did change the MTU to 1488 earlier today, that seemed to force and a re-auth but not a resync.

My experience with ECI cabs is that unless you are on a short line they seem to be very reluctant to remove interleaving.

When I moved and the fault on my line was fixed, I was on a fastpath connection for about 5 months until I got a series of disconnection in quick succession when Openreach were installing a new cabinet. The following day DLM interleaved this line and it's been that way ever since, almost 10 months now. It's not as if the downstream error rate is high, averaging around 1.2 ES per hour.

Thats a little disappointing to hear.

My Infinity 1 speeds were 55Mbps (maxed out) on fathpath - with an actual of 49-50Mbps.

Switch to PN and i'm on 51Mbps with an actual for 46Mbps - up to 80Mbps package; with interleaving on.

I can only hope it takes me off soon. I did have some power cuts a few months ago, it took approx 20 days to go back on fast path. I think it took longer because the HH5 at the time has a known habit of constantly resyncing itself every 5-7 days, issuing a user term req.

thanks for the info

Edited by oldskool (Wed 30-Jan-19 11:24:44)

AIUI FTTC cabinet Openreach modems don't recognise last gasp on disconnection.

At the second midnight, Interleave Depth went right down to 4/1, INP went to 47.00 and as was predicted above, G.INP turned on.

Well it�s been 2 weeks since I switched from BT to PN and was immediately interleaved.

Not one resync by DLM or me.

Perhaps I should restart the modem. Doesn�t look like DLM is acting at all. No idea what�s gone wrong

In reply to a post by oldskool:

Well it�s been 2 weeks since I switched from BT to PN and was immediately interleaved.

Not one resync by DLM or me.

Perhaps I should restart the modem. Doesn�t look like DLM is acting at all. No idea what�s gone wrong

You'd be better to just leave it alone. It took over two months before mine recovered. And that's a line that was rock steady for years before and has been rock steady for years since.

Restarting the modem will never, ever make DLM make a positive change on your line.
It sees a resync as a negative, instability.

When you are capped at 55Mb your line runs much more stable, lower FEC, ES, higher SNRM.

Personally I had to cap my line to a lower sync speed for a few days to get DLM to move my line to fastpath. I'm not familiar with the TP-Links and if they are able to apply a temporary cap on the sync speed.

There are MANY threads on kitz with members having to cap their line to get DLM to nudge them to fastpath.

Tried to stay quite patient but its been over a month now since i switched to PN

DLM still hasn't performed even 1 resync.

Unfortunately our electricity tripped yesterday. I decided to switch off the router incase it kept tripping, which it did.

Anyway, after i sorted the problem, i turned everything back on and the modem still synced at a lower speed than my old infinity 1 (which was 55Mbps maxed out) - i'm still at 51Mbps and i'm interleaved still. No errors logged and line is stable.

What should i do, i should be syncing closer to 60Mbps.

The only thing I know that works to remove interleaving is capping the line.
I was interleaved for 9 months. A few days after applying a cap the line switched to fastpath.

Applying a cap requires a Broadcom modem with access to the Broadcom CLI to set a cap on the sync, or a Lantiq modem with the ability to instead the target SNRM.

The main sticky on the kitz fibre forum is for exactly this problem, which many on ECI cabinets are stuck with.

https://forum.kitz.co.uk/index.php/topic,16427.0.html