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[William Grimsley]

Ok so going from 76/20 to 55/10 = no DLM reset.

That's bad news. PM me, I may have an idea to get an engineer to reset DLM.

That's not correct. There has been a DLM reset as I've lost G.INP but the banding is still in place. Ok, will PM you now thanks.

Surely, if DLM has been reset by a package upgrade, trying to get an engineer won't help?

Pings have increased from the low 20's ms to the low 30's ms...

[William Grimsley]

I'm onto BT live chat now, I'm so confused.

[digitalnemesis]

Ok so going from 76/20 to 55/10 = no DLM reset.

That's bad news. PM me, I may have an idea to get an engineer to reset DLM.

That's not correct. There has been a DLM reset as I've lost G.INP but the banding is still in place. Ok, will PM you now thanks.

Surely, if DLM has been reset by a package upgrade, trying to get an engineer won't help?

Pings have increased from the low 20's ms to the low 30's ms...

Your SNR margin dropped to ~6 dB whilst your attainable stayed around the same. Really strange.

Your before:

xDSL
Mode   VDSL2
Traffic Type   PTM
Status   Up
Link Power State   L0
Downstream   Upstream
Line Coding (Trellis)   On   On
SNR Margin (dB)   10.4   6.2
Attenuation (dB)   25.8   0.0
Output Power (dBm)   12.0   5.9
Attainable Rate (Kbps)   44544   8007
Rate (Kbps)   34999   8007
B (# of bytes in Mux Data Frame)   166   239
M (# of Mux Data Frames in an RS codeword)   1   1
T (# of Mux Data Frames in an OH sub-frame)   0   42
R (# of redundancy bytes in the RS codeword)   8   0
S (# of data symbols over which the RS code word spans)   0.1517   0.9524
L (# of bits transmitted in each data symbol)   9229   2016
D (interleaver depth)   16   1
I (interleaver block size in bytes)   175   120
N (RS codeword size)   175   240
Delay (msec)   0   0
INP (DMT symbol)   48.00   0.00
OH Frames   0   0
OH Frame Errors   0   142
RS Words   491979456   1067642
RS Correctable Errors   635577   0
RS Uncorrectable Errors   0   0
HEC Errors   0   0
OCD Errors   0   0
LCD Errors   0   0
Total Cells   3676665736   0
Data Cells   219415830   0
Bit Errors   0   0
Total ES   0   122
Total SES   0   0
Total UAS   31   31

After:

xDSL
Mode   VDSL2
Traffic Type   PTM
Status   Up
Link Power State   L0
Downstream   Upstream
Line Coding (Trellis)   On   On
SNR Margin (dB)   6.5   5.9
Attenuation (dB)   25.6   0.0
Output Power (dBm)   12.1   5.3
Attainable Rate (Kbps)   46082   8079
Rate (Kbps)   34998   8079
B (# of bytes in Mux Data Frame)   31   239
M (# of Mux Data Frames in an RS codeword)   1   1
T (# of Mux Data Frames in an OH sub-frame)   64   43
R (# of redundancy bytes in the RS codeword)   10   0
S (# of data symbols over which the RS code word spans)   0.0290   0.9440
L (# of bits transmitted in each data symbol)   11568   2034
D (interleaver depth)   1123   1
I (interleaver block size in bytes)   42   120
N (RS codeword size)   42   240
Delay (msec)   8   0
INP (DMT symbol)   3.50   0.00
OH Frames   536564   147195
OH Frame Errors   0   4
RS Words   205904822   2073743
RS Correctable Errors   2676   0
RS Uncorrectable Errors   0   0
HEC Errors   0   0
OCD Errors   0   0
LCD Errors   0   0
Total Cells   101088756   0
Data Cells   1368670   0
Bit Errors   0   0
Total ES   0   3
Total SES   0   0
Total UAS   28   28

[Black Sheep]

From an Openreach perspective, regarding the resetting of DLM, this is the official line on FTTC faults we pick up ..............

'Check and prove that all wiring meets quality standards. Complete relevant checklist and add notes.    Do not undertake speculative or precautionary changes unless advised by SMC.  Successful PQT / ECLIPSE and VDSL Close Out Tests are required to be completed before closing the fault. Only request a DLM reset if you have found and resolved a definite fault and the current sync speeds are significantly below the max attainable speeds shown on your tester.' 

[William Grimsley]

Ok, the live chat has now gone to customer care and they are doing "checks on the line" um, didn't realise they could do that on FTTC?

[William Grimsley]

From an Openreach perspective, regarding the resetting of DLM, this is the official line on FTTC faults we pick up ..............

'Check and prove that all wiring meets quality standards. Complete relevant checklist and add notes.    Do not undertake speculative or precautionary changes unless advised by SMC.  Successful PQT / ECLIPSE and VDSL Close Out Tests are required to be completed before closing the fault. Only request a DLM reset if you have found and resolved a definite fault and the current sync speeds are significantly below the max attainable speeds shown on your tester.' 

Sounds about right!

[daveesh1]

Well just looks like we will have to wait and see if DLM works. I have a great chunk of interleaving that's been applied about 1300 off the top of my head will post some stats in a bit.

[William Grimsley]

BT customer care says that "they're still running tests at the telephone exchange and that you will experienced some dropouts today". Interesting... I don't really believe that to be honest.

[digitalnemesis]

BT customer care says that "they're still running tests at the telephone exchange and that you will experienced some dropouts today". Interesting... I don't really believe that to be honest.

Was that UK support?

[William Grimsley]

BT customer care says that "they're still running tests at the telephone exchange and that you will experienced some dropouts today". Interesting... I don't really believe that to be honest.

Was that UK support?

Yes, luckily!

[digitalnemesis]

Sounds like BS. If they really wanted to help an engineer would be sent out to reset DLM.

[William Grimsley]

Sounds like BS. If they really wanted to help an engineer would be sent out to reset DLM.

Same here, they said if it didn't increase by midnight then they would do something about it. I wonder if I should reply to the text message. What do you think?

[digitalnemesis]

Sounds like BS. If they really wanted to help an engineer would be sent out to reset DLM.

Same here, they said if it didn't increase by midnight then they would do something about it. I wonder if I should reply to the text message. What do you think?

Lol I've been through that before.  They basically running automated tests which wont find anything wrong.

After these 'tests' they're going to say your speed is within acceptable limits.
Keep pushing.

[William Grimsley]

Cool, I'll reply to the text message and demand engineer visit.

[atkinsong]

William, look at your stats! Pre reset interleave depth was 16, post reset interleave depth is 1123. Hence large difference between attainable and actual and increased latency. probably not banded at all.