Broadband being limited

Question

Hi Guys, can anyone work some magic with these numbers if possible please? Our line should deliver between 3-7MB/s
Current Download speed is 0.49MB/s on BTwholesale site, with Upload 0.35MB
Line state:
Connected
Connection time:
0 days, 04:07:40
Downstream:
3.438 Mbps
Upstream:
448 Kbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.1 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
12.9 dB / 24.0 dB
Line attenuation (Down/Up):
46.2 dB / 27.0 dB
Output power (Down/Up):
19.8 dBm / 12.2 dBm
FEC Events (Down/Up):
503875 / 146
CRC Events (Down/Up):
1554 / 118
We're about 1.5 mls from the exchange in a straight line, and rough guess around 100mtr's from the cabinet. Line runs off a pole to our roof, where there's a junction box outside, enters the loft with 1mtr of flat cable, then junction box to 10mtrs of Cat5 twisted pair to the master socket - Not BT socket but is a MASTER. cables loop in/out terminals 3-5 (ring wire removed) the loop out then feeds a second socket around 8mtrs away. Router achieves same speeds etc at both points.
History: Broadband has always seemed to offer a speed of around 2.6MB/s as best when tested on the Intel speed test in the past, worst is possibly around 2.2MB/s. We're currently having fibre installed in our village, our cabinet is yet to be fitted.
About 15 days ago the phone line had sound like a scrunching crisp packet, and also steady static noise. BT were called who sent an openreach tech out around 3 days later. He identified and fixed a line break around 60m from the property, but also mentioned it might be an intermittent fault as the ringtone disappeared during his visit? however mentioned he was unable to check the pole, external roof and loft connections given the access.
He did also discover that the static noise on the line was only present with the router: Home hub 3 connected - you could also hear the odd noise the router makes down the phone when initializing. He tried a different filter and also the cable between the router and filter was changed, both making no difference he advised that we should report the router to BT. He left with the line being clear (with the router not connected), however mentioned he was unable to check the pole or the roof connections given the access.
So.. Phone line clear for voice calls, but broad band speed was: line speed 3.5MB but only 0.45MB at the device
BT 150 Broadband support were called who've supplied a new router - this didn't make any difference. Tech team 2 got involved who reset the line - apparently the fault? put a cap on the line. With this being done, the sync speed was 5.125MB/s and 4.6MB/s at the device (results off BT speed test) and I was advised that they'd monitor the line for 3 days as it 'learned'. Latency was also changed from Interleaved to Fast.
Checking the router info during this time showed figures as shown in the chart above, although the downstream was 4-5ish MB and the noise margin was 3.5db, FEC, CRC errors were much higher.
From that, the download speed has gradually dropped to where we are now.. and I'm talking to BT stage 1 again who are asking about filters etc, and completely oblivious to any past events on our line??
I'm not sure what to do, if anyone has any help it would be much appreciated, as explaining the above to someone who has only the ability to diagnose fault off flowchart each time is very time consuming! Many thanks

Answer 1

Hi, thanks for your reply, please see comments
is there still noise on quiet line test  dial 17070 option 2  should be quiet and best with corded phone. When a test is done with a corded phone there is a 'just' audible steady static sound to the line. It's not silent essentially.
do you have a test socket you can use? No. Our master socket is non BT but does have the capacitor? barrel behind the plate. The engineer ran all his tests through this, and as I remember found some issue at the cabinet, whch was fixed.
your connection time is only 4hrs is that due to manual reset or router dropping connection?  your noise margin is high at 12.9db as normal is about 6db sugegsting line noise and or drops in connection. It will have dropped. I think the best connection managed over the last week or more is just over 1 day without a drop.
can you run btspeedtester and when first test completes then run diagnostic test and post results
0.49mbps Down
0.00mbps Up
43.13 Ping Latency