Fibre 80/20 speed expectations
@fwdlink Your full DLM profile is: "Downstream: 0.128M-80M3dB with Retransmission (Low). Upstream: 0.128M-20M with Retransmission (Low)" and I'm afraid there's no further review or investigation necessary as everything's correct.
As per previous posts, retransmission will give a lower than 'normal' bRAS/IP profile resulting in a lower throughput.
To confirm it's likely that retransmission is causing this, but it'd be difficult to say because you're currently within Openreach's expectations for your line at between 68mbps and 80mbps so they wouldn't investigate further I'm afraid.
Hi @ncd Looking into this again a GEA test is showing your bRAS profile rate at 66426 and your sync speed at 79.9mbps, whereas a different system (RRT) is showing your sync speed at 70mbps is more in line with the bRAS profile. On the other hand the profile on your account which should always match the bRAS is set at 64200.
With regards to your DLM profile, yep you're still on retransmission low: Downstream: 0.128M-80M3dB with Retransmission (Low). Upstream: 0.128M-20M with no error protection
The good news is that a GEA test has given the following conclusion:
| Problem Explanation: [ ND502 ] DSL and BRAS profile mismatch has been identified. Resolution / Recommendation: Please pass to BTW for further diagnostics. |
I've raised the fault to Wholesale and this should hopefully get corrected within the next 24 to 48 hours, although recently I've been seeing these type of faults progress as an automated request to arrange an engineer visit with no manual override.
In the meantime, what's the actual sync speed/data that your router is showing you?
Thanks for getting back to me @ncd
No problem, in that case the bRAS rate of 66426 looks far too low for a sync speed of 79.9mbps let alone 64200, even if it should be 90% of the sync speed, I'd expect it should be set at around 71000, unless I'm missing something.
As predicted the fault report was cleared 90 minutes later with the below message:
| KBD - Your fault has been diagnosed using the Knowledge Based Diagnostic Tool: > NO BTW FAULT - Diagnostics test show no BT fault. Please check all end user equipment and settings. If you require further investigation please book an appointment for an SFI engineer to investigate further. Thankyou. |
Running another KBD (a series of tests which includes a GEA) that's still showing the same 'DSL and BRAS profile mismatch' message, so I've discussed this with a Wholesale adviser and they've said that they don't have any control over this and it's DCoE (Diagnostics Centre of Excellence) at Openreach who oversee this, and the only way to raise something there is through an engineer unless KBD shows a specific fault code, passing the fault directly to the diagnostics team.
I'd personally recommend we go for an engineer to investigate further as your throughput is below both the estimated speed range for your line and and your minimum guaranteed speed. If you're happy to go ahead can you add a reply to the ticket Here with when you'd be free for an engineer to visit? If you concerned about a potential engineer charge, we won't charge you if the engineer finds no fault as your speeds are below the minimum guaranteed.
Hi @fwdlink I've looked into this again for you and there doesn't appear to be anything odd about your connection with your router getting a sync speed of 79.9mbps and the bRAS rate at 75916.
Running a GEA test isn't showing any mismatches like above, it's reporting:
| Problem Explanation: [ NF507 ] No issues have been identified in the BTW network. Resolution / Recommendation: KBD tests indicate no BTW network fault. Please perform all CP and End User checks. BTW Performance/Speed test has not been run. |
When you had 76mbps throughput, do you know if retransmission was enabled on the line?
Thanks for the update @fwdlink
It's good to see your speeds have improved. 
Apart from testing your line last night I didn't make any changes to the service, it's possible it's either a coincidence or the test knocked something back into place, I've not seen that happen very often though so it's certainly a mystery.
The 'lag' in the system from what I've seen only really applies to the DLM banding on a GEA test that it's occasionally out of date by up to 14 days, but RRT data is accurate as of the day before.
Fingers crossed this remains fixed for you!
Hi Andrew, I'm sorry to see the problems you've been experiencing. 
I've tested your line today and while your router is in sync at 79.9mbps, the tests are showing the sync speed at 76.6mbps due to retransmission high enabled on the line with the current bRAS profile rate at 76326 that's correct for the sync speed of 79.9mbps. The sync speed that our tests show would be accounting for retransmission high as it often does.
As you've noted the Current Line Speed on your account (We refer to it as the Connection Profile) is set at 21mbps, upon further investigation, our system reset the profile to this for some reason when the product change to fibre extra completed, and then when your connection dropped on the 9th February your speeds would've been capped to 21mbps.
I've fixed the profile now and momentarily dropped your connection to apply the correct profile to unrestrict your speed. Due to the way your connection and a handful of others route across our network, this particular profile that should always be set at whatever the bRAS line profile is, will cap your download speed if the value is under that.
The majority of lines ignore the Connection Profile on their respective accounts, it's from a bygone era when we used to traffic manage and as far as I'm aware it isn't relevant anymore but it'll unfortunately restrict some peoples speeds if incorrect.
The most common reason for this profile to affect your speed is if you have a static IP due to how we assign them to a connection. One benefit is that it makes things a lot easier to retain the static IP if you ever go through a house move.
Without further ado, can you retest your speed and let us know how they look?