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[shaun1264]

I artificially reduced my speed a few days ago via Puty to 38mbps to reduce my build up of FEC errors which was turning into ES's after a day or two.  FECs would go into the thousands in each 15 mins and ES would start.  I am using a VMG8924 after reducing my speed FECS went right down and SNR went up. 

Today I decided to do a reboot to remove the speed cap.  The stats said my speed is back up to 54mbps but my speed using various speed checks are stuck around 36mbps. I swapped routers for a Billion 8800NL r2 but the speed still seems to be stuck around 36mbps even though my attainable is around 50mbps using this router.  What i've noticed with this router is that my SNR is all over the place low was 3.2 and high as 4.8!? on the VMG8924 it was stable.  Im struggling to work out what the hell has happened.

Mode   VDSL2
Traffic Type   PTM
Status   Up
Link Power State   L0
Downstream   Upstream
Line Coding (Trellis)   On   On
SNR Margin (dB)   3.4   6.1
Attenuation (dB)   21.3   0.0
Output Power (dBm)   12.0   5.3
Attainable Rate (Kbps)   47652   8154
Rate (Kbps)   48827   8154
B (# of bytes in Mux Data Frame)   227   237
M (# of Mux Data Frames in an RS codeword)   1   1
T (# of Mux Data Frames in an OH sub-frame)   0   37
R (# of redundancy bytes in the RS codeword)   10   16
S (# of data symbols over which the RS code word spans)   0.1485   0.9270
L (# of bits transmitted in each data symbol)   12820   2192
D (interleaver depth)   4   1
I (interleaver block size in bytes)   238   127
N (RS codeword size)   238   254
Delay (msec)   0   0
INP (DMT symbol)   54.00   0.00
OH Frames   0   0
OH Frame Errors   0   5
RS Words   70772204   11384796
RS Correctable Errors   53343   15
RS Uncorrectable Errors   0   0
HEC Errors   0   0
OCD Errors   0   0
LCD Errors   0   0
Total Cells   247793697   0
Data Cells   876761   0
Bit Errors   0   0
Total ES   0   5
Total SES   0   0
Total UAS   29

[Ixel]

I notice your INP is 54, if I'm not mistaken that's 'retransmission high' on DLM. I read somewhere that it knocks a fair bit off your actual true speed hence why you might be seeing what you see in the speed test, though down to 36 megabits does seem a bit extreme so I might be a bit wrong. However I've not had much of a chance to use DLM as I'm on one of the horrid ECI DSLAM's who might one day see G.INP again and hopefully for good, so I might be slightly wrong. I'm sure someone will reply soon to confirm or expand.

[22over7]

I'm interested to see what people say. I too appear to have retransmission high (INT 8, INP 52)
and just removed caps including DS at 70 (72?) mbps.  It is as if my speeds are still capped
-- although I'm synced at 80mbps and the attainable is almost 100 mbps!   To me this
suggests that about 12% of my sync rate is taken up with error-protection measures that could
well be over the top.

[j0hn]

Check your IP Profile isn't stuck.
https://windows.mouselike.org/be/index.asp?DoAction=BrasChecker

It should be 91-92% if you are on retransmission high. It's around 96.7% for retransmission low.

Stopping the PPP session for 20 mins can help with a stuck BTw IP Profile. If you are with Plusnet they have an additional profile on top of the BT profile.

[shaun1264]

I stopped the session for 20 mins but still the same.  Speed is currently 33mbps even though my line rate is 52mpbs .   I put the vmg8924 back on.   Still the same.  I've started uploading data again to mydslwebstats under shaun1264. 

I had a resync this morning putting me back on a 5dB SNR.  I was on a 4.  I just don't understand as my line has been stable .  Perhaps DLM does now take note of FEC errors. ?   G.INP sure does take a large chunk of speed away if it is that!!