How long does 3db take to start?

I had a lift and shift around 9.9.20 with a port swap by Openreach. DLM has intervened once by changing Interleaving from 4 to 8. But I am not seeing any movement on my 6db target margin. Uno my ISP has put through a DLM reset request but that was a few weeks ago, again no movement.

Am I waiting in vain?

Huawei DSLAM I am connected to.

Week, Month or never! Only DLM decided! If your sync rate 79993 u will not gonna see any 3dB because your line is on max 80Meg

Edited by adslmax (Thu 22-Oct-20 00:13:45)

Sync is 54. I had 3db all last year.

In reply to a post by Banger:

Sync is 54. I had 3db all last year.

you need to update your signature. Perhaps remove all the sync details as they change.

Sig changed

Post deleted by RobertoS

As quick as 2 days after a DLM reset.

It used to be a couple days for G.INP to be applied and then another couple for the drop to 5dB but G.INP is now kept active after a DLM reset which knocks a couple days off.

It could change at any point but if it doesn't change within a few days then most of the time it never will.

Not sure who your ISP uses for backhaul but BTWholesale will reject any DLM reset request from your ISP if the line is within its estimates with no banding in place.
They are very unlikely to process a DLM reset just because the line hasn't dropped SNRM target.
Talktalk backhaul is likely to be the same if not similar.

How come I had 3db all last year and it changed due to a port swap? TTB is my backhaul.

The port swap sees the settings reset back to ‘out of the box’ ...

So is DLM stuck? I am not seeing any downstream Error Seconds just upstream.

DLM is really strange.

I switched ISP's and had no G.INP - think the line sync'd at 56Mbps - at 6db SNR.

About 7 days later I got G.INP - that pushed me up to around 65Mbps.

After about 6 weeks I noticed drops at 2am every 2/3 days. DLM would never go past 4db though. Then it put me up to 5db and left me there for 2 months.

I decided to get a new modem as the HG612 was old. Same thing. It pushed for 4db and ended up back on 5db.

I removed the front of the 5C and plugged it into the test socket about 6 months in and it's now settled at the sync speed in my sig at 3db on retx low. The D side is around 350m.

Does DLM not take FEC's into consideration?

Removed front of the 5C will make no difference in Test Socket to DLM. Also DLM will not bother about FEC Errors. (only the CRC, ES, SES Errors & if resync more than 5 times in the space of 24 hours)

Edited by adslmax (Fri 23-Oct-20 09:59:14)

In reply to a post by adslmax:

Removed front of the 5C will make no difference in Test Socket to DLM.

It can and does.

If internal wiring is connected poorly it can make a massive and immediate improvement.

Also DLM will not bother about FEC Errors.

I and others believe it does.

My FEC errors once get 87000 on downstream but no DLM act.

Edited by adslmax (Fri 23-Oct-20 12:05:34)

And my FEC has been at over 1 million per minute with no DLM action.
That doesn't mean DLM doesn't use it.

It's my opinion that DLM doesn't punish a line for high FEC but it takes FEC in to consideration when deciding whether to remove actions.

For example DLM won't remove interleaving or Retx High if the FEC numbers are too high.

That's the DLM strange way! No ones know when it will bite the line change in fast path, interleaved, low retx, high retx, snr 3dB or even banded.

low retx end up IP Profile 96.69% from sync rate and high retx end up IP Profile 91% from sync rate

Edited by adslmax (Fri 23-Oct-20 12:16:43)

That IP Profile only applies on BT Wholesale circuits. AIUI the OP is on TT backhaul.

You seem to be posting useless information a lot these days Max. Even when it is correct it is rarely relevant to the discussion at the time.

Thought BTw and TTB are same IP Profile because it still controlled by Openreach for all FTTC lines, if not, explain what the difference?

In reply to a post by RobertoS:

That IP Profile only applies on BT Wholesale circuits. AIUI the OP is on TT backhaul.

You seem to be posting useless information a lot these days Max. Even when it is correct it is rarely relevant to the discussion at the time.

While only BT Wholesale have a publicly viewable IP profile system, all backhaul providers have to apply their own limit to downstream traffic based on sync speed.

With Talktalk and Sky backhaul this gives identical throughput values as BTw with around 96.7% on Retx Low and between 91-92% on Retx High.

5C's can and do fail.

I don't know if mine was faulty but the random noise bursts and ES's disappeared when I removed it.

Can't your isp request Openreach engineer to come out and replaced new socket

In reply to a post by j0hn83:

While only BT Wholesale have a publicly viewable IP profile system, all backhaul providers have to apply their own limit to downstream traffic based on sync speed.

With Talktalk and Sky backhaul this gives identical throughput values as BTw with around 96.7% on Retx Low and between 91-92% on Retx High.

You seem recently to be trying to "correct" me at every available opportunity. Rarely do you add anything useful to my posts, nor is what I have posted actually wrong in substance.

It's as much of as an irritant to me as adslmax is to others. Slightly below that from a wasp in the room, but worse than the occasional silent fly. I hope it isn't deliberate. I'm on the verge of needing to start counting my posts site-wide and how many pointless "non-corrections" you make to them .

When I was more active on the technical/ISP forums I frequently posted extracts from and links to BT SIN 498 on precisely this matter.

Yes, all providers are required (expected) to limit the speed data is sent to the relevant DSLAM, in one way or another, but there is only one (wholesale) provider that specifically uses the term "IP Profile", and I am sure that is what the poster I replied to was referring to.

Also, don't forget that the IP Profile system far predates FTTx

You what?

Your post was nonsense. It's completely wrong in substance.

That IP Profile only applies on BT Wholesale circuits. AIUI the OP is on TT backhaul.

You seem to be posting useless information a lot these days Max. Even when it is correct it is rarely relevant to the discussion at the time.

You criticised max for posting an irrelevant statement, claiming the OP's line doesn't have or can't have the limited throughput max suggested based on the DLM profile, because it isn't a BT Wholesale line and therefore no IP Profile.

That's just totally incorrect.

All backhaul providers must limit a lines profile based on the current sync speed, just as BT Wholesale do.
They all have their own internal version of the BT Wholesale IP profile, just implemented their own way.

Max's English isn't the best and you know it.

Is your justification for jumping on his post because he referred to it as an "IP profile"?
He didn't call it a BT Wholesale IP Profile.

That IP Profile only applies on BT Wholesale circuits

That's just incorrect.

I corrected that so the OP didn't make the assumption that his line wasn't profiled based on the current sync and current DLM profile, which is what your post seemed to suggest.
It is.
Almost identically to how BT Wholesale do it.
At least 1 of the other GEA backhaul provider even names it an IP Profile internally.

My correcting of you in the other thread regarding the Wayback post was clearly in jest. Don't get your knickers in a twist.

You're on a public forum. If you don't want corrected once in a while then stop posting.

Edit: typos

Edited by j0hn83 (Fri 23-Oct-20 22:21:57)

You have my sympathy.

But:

In reply to a post by RobertoS:

Please desist.😁😁

Sweet dreams.