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Author Topic: BT DLM advice needed..  (Read 5374 times)

8062282

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  • Posts: 64
Re: BT DLM advice needed..
« Reply #45 on: October 06, 2019, 08:30:14 AM »

Hi Kitz & Black Sheep, thanks for your helpful responses. I have read them all. The problems with my line seem to be dynamic in that it's changing all the time. The last few days, it's changed for the better (or so it seems). The noise at night was dropping but only some of the time, not every night. Since 2/3 days ago, the SNR is going up every night & instead of dropping to about 6.4dB sometime during the day, it's not dropping as much. The noise during the day seems better, as the last 2/3 days the SNR has been at 6.8dB.  At the moment I'm at 8.1dB with an attainable of 47,648. When it drops to 6.8dB, the attainable is 43/44Mb.  Errors since the last re-sync have been negligible. 1400 of those US ES were caused by the re-sync (No idea why it does that).



xdslctl info --stats
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    0
Last initialization procedure status:   0
Max:    Upstream rate = 8539 Kbps, Downstream rate = 47701 Kbps
Bearer: 0, Upstream rate = 8028 Kbps, Downstream rate = 34999 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):        8.1             6.1
Attn(dB):        19.9            0.0
Pwr(dBm):        12.7            5.8


                        VDSL2 framing
                        Bearer 0
MSGc:           18              25
B:              57              238
M:              1               1
T:              62              52
R:              16              16
S:              0.0527          0.9466
L:              11232           2155
D:              613             1
I:              74              255
N:              74              255


                        Counters
                        Bearer 0
OHF:            228149293               636580
OHFErr:         1190            277
RS:             3780988062              1435497
RSCorr:         2751357         11195
RSUnCorr:       26647           0


                        Bearer 0
HEC:            8195            0
OCD:            2               0
LCD:            2               0
Total Cells:    3421769341              0
Data Cells:     290272971               0
Drop Cells:     0
Bit Errors:     0               0


ES:             86              1645
SES:            2               4
UAS:            30              280091
AS:             561482


                        Bearer 0
INP:            3.00            0.00
INPRein:        0.00            0.00
delay:          8               0
PER:            2.46            12.35
OR:             78.03           20.07
AgR:            35076.81        8047.70


Bitswap:        130642/131759           8200/8340


Total time = 6 days 11 hours 58 min 32 sec
FEC:            2751357         11195
CRC:            1190            277
ES:             86              1645
SES:            2               4
UAS:            30              280091
LOS:            0               4
LOF:            0               4
LOM:            0               0
Latest 15 minutes time = 13 min 32 sec
FEC:            916             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:            2200            0
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 = 11 hours 58 min 32 sec
FEC:            246437          682
CRC:            8               15
ES:             2               14
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 1 day time = 24 hours 0 sec
FEC:            431341          4984
CRC:            37              41
ES:             9               34
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Since Link time = 6 days 11 hours 58 min 1 sec
FEC:            2751357         11195
CRC:            1190            277
ES:             86              1645
SES:            2               4
UAS:            0               280061
LOS:            0               4
LOF:            0               4
LOM:            0               0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0


I haven't spoken to the BT MOD since last weekend as I wanted to collate a weeks worth of stats to indicate why I don't think my line should have been banded. When the SNR dropped to 4.8dB that coincided with the interleave coming off & the speed increasing. Probably the increase of X-Talk/Interference pushed it down, as you said Kitz. The missing tones have almost filled in at the beginning but I'm still missing tones from 250 - 290


Since midnight, apart from FECs, there hasn't been any errors on the DS at all.  What causes US errors? Are they something the DLM takes into account?



Average error rates for 06 Oct 2019


CRC erors per hour:  0 Down,  1.19 Up
FEC erors per hour:  6047 Down,  1.43 Up
HEC erors per hour:  0 Down,  0 Up
ES per hour:         0 Down,  1.07 Up
SES per hour:        0 Down,  0 Up
Total ES in the day: 0 Down, 9 Up


Thanks for all your help. I don't understand a lot of it but it's helping me learn  :)
« Last Edit: October 06, 2019, 10:23:10 AM by 8062282 »
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j0hn

  • Kitizen
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  • Posts: 3365
Re: BT DLM advice needed..
« Reply #46 on: October 06, 2019, 03:00:00 PM »

Usually banding is applied for too many resyncs in a short time period.

Was DSLStats running as the banding was applied and was there a number of resyncs at or around that time?

edit:

I see it happened here

Hi - Thanks for replies, Kitz & jOhn. The internet dropped connection last night & DSLstats threw a wobbler sometime in the night, When I checked it this morning, it came up with a floating decimal point error & stopped recording. I had to close it & re-start it.


Anyway, the DLM kicked in last night & I'm back to interleaving on at 793 on the DS. SNR is a 6.3dB. Speed has dropped to 34,995 with an attainable of 41,727. My errors prior to DSLstats having a dicky fit were.

Line likely resynced multiple times during that period.
« Last Edit: October 06, 2019, 03:07:07 PM by j0hn »
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8062282

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  • Posts: 64
Re: BT DLM advice needed..
« Reply #47 on: October 06, 2019, 04:20:42 PM »

Hi John, The re sync was after the two full days of increased errors when the DLM took interleaving off & the speed increased. Due to the noise, the SNR dropped to 4.8dB . I didn't do anything until the 29th Sept when I was getting millions of FECs all through the day. I shouldn't have, but before I went to bed, I took the DSL cable out the back of the modem & left it for about 20 secs. That stopped the FECs & the speed went from 34,995 to 34,999. I only did that as I was worried it might start creating other errors during the night.  I checked with BT to make sure I hadn't been banded & they said I had, at 34,999.
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