What is happening here?

[#1]

Hello @gco

Thanks a lot for reaching out. I'll upload a KBD that I've just run, but the speeds on there are incorrectly showing that the line is syncing at 33.5 Mbps, whereas an RRT is showing the line to be syncing at 39.9Mbps. Can you please upload a photo of your helpdesk page which will show the current data rate? This will give us all a better indication of the current sync speed.

When it comes to FTTC, we can't directly turn interleaving on and off, nor can we directly reset the DLM profile. Openreach adjust this according to the number of disconnections on the line at any given time. If many are found, it'll band the line at certain speeds to preserve stability - so in effect, it's doing it's job.

Nonetheless, please send across a screenshot of your helpdesk page, covering your personal information, and we'll take it

GEA Test Detail
Circuit ID	NA	Service ID

Test Outcome	Pass
Test Outcome Code	GTC_FTTC_SERVICE_0000
Description	GEA service test completed and no fault found .
Main Fault Location	OK
Sync Status	In Sync
Downstream Speed	33.5 Mbps (RRT shows 39.9Mbps)
Upstream Speed	9.7 Mbps
Appointment Required	N
Fault Report Advised	N
NTE Power Status	PowerOn
Voice Line Test Result	Pass
Radio Frequency Ingress	Not Detected
Repetitive Electrical Impulse Noise	Not Detected
Cross Talk	Not Detected
Estimated Line Length In Metres	940.8
Upstream Rate Assessment	Very Good
Downstream Rate Assessment	Reasonable
Interference Pattern	Not Detected
Service Impact	No Impact Observed
Home Wiring Problem	Not Detected
Downstream Policing Discard Rate	0.0
Customer Traffic Level	Upstream and Downstream traffic detected
Technology	VDSL
Current 15Min Bin Retrains	0
Last 15Min Bin Retrains	0
DP Type	External
Profile Name	0.128M-40M Downstream, Interleaving Low - 0.128M-10M Upstream, Error Protection Off
Time Stamp	2021-11-11T00:45:00

Parameters	MIN	MAX	AVG
Down Stream Line Rate	34.9 Mbps	39.9 Mbps	39.6 Mbps
Up Stream Line Rate	9.6 Mbps	9.6 Mbps	9.6 Mbps
Up Time	2.0 Sec	900.0 Sec	892.6 Sec
Retrains	0.0	1.0	0.0

[#2]

Here's what I am currently getting from my router.

Some of the stats on your table look as though they come from how it was before DLM intervened last night.

I'm trying to take shots every so often to see if there are any particular times when the error rate increases excessively, but it's very hit and miss. I guess there's no way of getting the data that's used by DLM, which as I understand it provides 15 minute windows.

It's rather irritating that first it removes interleaving and then it bands the line. I'd have thought it would have tried interleaving first.

Gavin.

[#3]

and here's what it was before DLM intervened.

[#4]

Thanks a lot for getting back in touch. Both an RRT and KBD are now showing that speeds have dropped slightly since the last test, though these remain within your expected speeds, so wouldn't reach the fault threshold on our end. DLM will intervene if any drops are seen on the line, in order to preserve it's stability. I'd advise monitoring your connection and seeing how things go over the next week or two.

Feel free to reach out if you have any further issues though.