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[Alex Atkin UK]

Why are you still worrying about this after telling us time and time again you would stop monitoring your line rates?

[tubaman]

Your line can only just achieve the full 80Mbps sync rate at 6dB SNR, probably due to crosstalk as you have suggested earlier, and there is absolutely nothing that you can do about that. Given the storms that have been going through the country in the last day or so I wouldn't be surprised if the error counts have been high enough for DLM to think that a resync is in order, and when it does the sync rate will change slightly each time, which is what you are seeing. Unless your speed drops significantly further, which could then indicate a fault, then I'd say that what you are seeing is just the way your line is now and you'll just have to live with it.
As a comparison below are my line stats. I've lost a good 10% of sync rate over the years, probably due to crosstalk too. I know it's just way VDSL is so I live with it.  I suggest you think yourself very fortunate to have a line as good as you have.

Code: [Select]

xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    1
Last initialization procedure status:   0
Max:    Upstream rate = 6899 Kbps, Downstream rate = 43831 Kbps
Bearer: 0, Upstream rate = 6899 Kbps, Downstream rate = 43403 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Link Power State:       L0
Mode:                   VDSL2 Annex B
VDSL2 Profile:          Profile 17a
TPS-TC:                 PTM Mode(0x0)
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        2.9             5.3
Attn(dB):        26.6            0.0
Pwr(dBm):        11.9            6.5

                        VDSL2 framing
                        Bearer 0
MSGc:           -6              26
B:              227             207
M:              1               1
T:              0               41
R:              10              8
S:              0.0000          0.9573
L:              11396           1805
D:              4               1
I:              238             108
N:              238             216
Q:              4               0
V:              0               0
RxQueue:                104             0
TxQueue:                26              0
G.INP Framing:          18              0
G.INP lookback:         26              0
RRC bits:               0               24
                        Bearer 1
MSGc:           90              -6
B:              0               0
M:              2               0
T:              2               0
R:              16              0
S:              10.6667         0.0000
L:              24              0
D:              1               0
I:              32              0
N:              32              0
Q:              0               0
V:              0               0
RxQueue:                0               0
TxQueue:                0               0
G.INP Framing:          0               0
G.INP lookback:         0               0
RRC bits:               0               0

                        Counters
                        Bearer 0
OHF:            0               886704
OHFErr:         3118            1846
RS:             1904366184              2629671
RSCorr:         401638869               7477
RSUnCorr:       0               0
                        Bearer 1
OHF:            229217369               0
OHFErr:         97              0
RS:             1375303845              0
RSCorr:         34213           0
RSUnCorr:       142             0

                        Retransmit Counters
rtx_tx:         459985677               0
rtx_c:          20264470                0
rtx_uc:         339508          0

                        G.INP Counters
LEFTRS:         8730            0
minEFTR:        43400           0
errFreeBits:    3727063533              0

                        Bearer 0
HEC:            0               0
OCD:            0               0
LCD:            0               0
Total Cells:    2187685029              0
Data Cells:     2548911881              0
Drop Cells:     0
Bit Errors:     0               0

                        Bearer 1
HEC:            0               0
OCD:            0               0
LCD:            0               0
Total Cells:    0               0
Data Cells:     0               0
Drop Cells:     0
Bit Errors:     0               0

ES:             714             2542
SES:            57              0
UAS:            91              54
AS:             3682895

                        Bearer 0
INP:            51.00           0.00
INPRein:        1.00            0.00
delay:          0               0
PER:            0.00            9.85
OR:             0.01            25.98
AgR:            43498.78        6925.53

                        Bearer 1
INP:            2.50            0.00
INPRein:        2.50            0.00
delay:          0               0
PER:            16.06           0.01
OR:             47.81           0.01
AgR:            47.81   0.01

Bitswap:        1701772/1701788         32282/32386

Total time = 91 days 17 hours 6 min 39 sec
FEC:            762036871               10409
CRC:            5058            3170
ES:             714             2542
SES:            57              0
UAS:            91              54
LOS:            1               0
LOF:            4               0
LOM:            25              0
Latest 15 minutes time = 6 min 39 sec
FEC:            54592           0
CRC:            0               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 15 minutes time = 15 min 0 sec
FEC:            71624           2
CRC:            0               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 1 day time = 17 hours 6 min 39 sec
FEC:            11592052                131
CRC:            26              22
ES:             17              21
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 1 day time = 24 hours 0 sec
FEC:            12587814                516
CRC:            272             159
ES:             41              116
SES:            4               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            1               0
Since Link time = 42 days 15 hours 1 min 51 sec
FEC:            401638869               7477
CRC:            3118            1846
ES:             485             1472
SES:            31              0
UAS:            16              0
LOS:            0               0
LOF:            0               0
LOM:            15              0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0

[adslmax]

Code: [Select]

Max:    Downstream rate = 78131 Kbps
Bearer: 0, Downstream rate = 77375 Kbps


Code: [Select]

Connection speed (kbps):   77375     
SNR margin (dB):           6.4     

Do u guys think DLM will try lower SNR from 6.4 to 5.4 then 4.4 and lastly 3.4 to put connection speed from 77375 to 79999 in next few days?

I do knew VDSL2 do have crosstalk on the cabinet as more and more customers join in and filled up the cabinet except G.fast doesn't affect because G.fast has it own vectoring to avoid crosstalk.

[g3uiss]

Not if we have more storm activity. The heat also swells the cables and potentially causes issues.

[adslmax]

Not if we have more storm activity. The heat also swells the cables and potentially causes issues.

All my cable are underground (there is no overhead pole) I think underground are not heat issues? We have no thunderstorms only rain.

[tubaman]

...
I do knew VDSL2 do have crosstalk on the cabinet as more and more customers join in and filled up the cabinet except G.fast doesn't affect because G.fast has it own vectoring to avoid crosstalk.

Vectoring reduces crosstalk but does not avoid it altogether.
With respect to your current speeds, if your error rates stay low then DLM may drop SNR to 5dB to increase your sync rate but given how small an amount you are below the maximum available I wouldn't say that's a given. You just need to accept that you no longer have a 'perfect' line and join the club with the majority of others.
 

[adslmax]

I have decided to move to BT social tariff having fibre 40/10 @ £15 a month as I don't use any call plan for over 10 years.  I believe 40/10 will be more than enough for two people in my household including myself and my daughter both of using streaming etc Netflix and Now TV.

[tubaman]

I have decided to move to BT social tariff having fibre 40/10 @ £15 a month as I don't use any call plan for over 10 years.  I believe 40/10 will be more than enough for two people in my household including myself and my daughter both of using streaming etc Netflix and Now TV.

As long as you aren't both streaming 4k UHD then 40/10 will do the job quite adequately. My 43/6 connection happily supports a family of four with multiple streaming connections and two of us homeworking at times.

[adslmax]

It's will be UHD 4k streaming both of us at the same time but I don't know if it was ok for 40/10? Maybe I should choose social tariff 80/20 @ £20 a month instead?

[j0hn]

Why it keeping getting reduced and reduced in sync rate?

You know why.
VDSL2 sync rates vary s over time. Until now you have been very lucky to have a line that achieved above the 80Mb/s cap so it didn't affect you.

It isn't affecting your usage of the internet. It doesn't stop you doing anything you could do before.

If it really really bothers you (it clearly does) then why not give the DLM a "nudge" by capping the sync rate.
Cap it at 60/20 for a few days and the DLM should hopefully lower the SNRM target to 5dB, giving you 80Mb/s sync again.
But you knew that already 

[adslmax]

If it really really bothers you (it clearly does) then why not give the DLM a "nudge" by capping the sync rate.
Cap it at 60/20 for a few days and the DLM should hopefully lower the SNRM target to 5dB, giving you 80Mb/s sync again.
But you knew that already 

I forget how to do it?

[j0hn]

I forget how to do it?

Code: [Select]

xdslcmd configure --maxDataRate 60000 20000 100000
or

Code: [Select]

xdslctl configure --maxDataRate 60000 20000 100000
or

Code: [Select]

adsl configure --maxDataRate 60000 20000 100000
Depending on which modem you are using.

[tubaman]

It's will be UHD 4k streaming both of us at the same time but I don't know if it was ok for 40/10? Maybe I should choose social tariff 80/20 @ £20 a month instead?

I think you'll be pushing your luck on a 40/10 with that. Don't have any 4k equipment here and don't see the need as FHD quality is just fine as far as I'm concerned.
 

[adslmax]

Code: [Select]

xdslcmd configure --maxDataRate 60000 20000 100000
or

Code: [Select]

xdslctl configure --maxDataRate 60000 20000 100000
or

Code: [Select]

adsl configure --maxDataRate 60000 20000 100000
Depending on which modem you are using.

Using Billion 8800NL

[Alex Atkin UK]

I think you'll be pushing your luck on a 40/10 with that. Don't have any 4k equipment here and don't see the need as FHD quality is just fine as far as I'm concerned.

Its mostly about the bitrates or HDR for me (though streaming services often have HDR on 1080p streams these days).  A lot of content at 4K on streaming services is closer in quality to a normal Bluray, with their 1080p streams vastly inferior though granted they do a pretty good job of "good enough" for most people.

What a lot of people don't realise is a lot of how compression works is by throwing away the dynamic range and muting the colours.  Our depth perception works a lot on contrast so higher compression = a flatter looking image.  I'm constantly surprised by how much better a Bluray will look than a streaming service even though I know all this.