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[Chrysalis]

there is nothing unusual about his graph colin, you graph has the power cutback at a higher range so your lower tones are better, compare your tone 350 to his 350.  The reason is your cabinet is closer to the exchange than his, so in your area the adsl2+ tones are used on adsl services, whilst in his area not.  It is my opinion in areas where the distance is longer to exchange the cutback is more harsh I agree on that point (due to weaker adsl services) but that isnt a fault its how BT designed it. Its also only his first upstream channel with 0 bitloading not the downstream.

[ColinS]

there is nothing unusual about his graph ... that isnt a fault its how BT designed it.

Well, you're the only contributor to this thread (so far), including the OP, that thinks it's not at least unusual.
I never suggested it was a fault, I merely observed the lower SNR over the first 100 tones, not at 350,  most of which are shared tones, and asked a single question.
European regional PSD masks were defined by ETSI TM6.

The reason is your cabinet is closer to the exchange than his

and your evidence for that is what?  How far are we exactly from our respective exchanges?

We can all have opinions Chrysalis, but please try to avoid asserting things without providing at least some sort of evidence to back it up.

[Chrysalis]

I am surprised if you saying you have never seen a graph like his before, there is many like that posted on the internet, mine is the same here.

The power masking applied on VDSL is dependent on the locality to exchange or rather the loop loss on the lines covered by the cabinet (from exchange), so if its an area with say average 10db attenutation on adsl (close to exchange) then the low tones will have full power but tones between 250 and 500 will have cutback applied albeit a weak cutback.  If its an area with attenuation of say 50db from the exchange (like my area) then the cutback is below 250 and is usually more severe as well due to weaker adsl signals.  The reason is in an area like mine there is no point applying cutbakc to 250-500 as there is noone around here on adsl using those tones as the lines are too long.  In areas with low attenuation the tones 0-250 are strong enough to withstand vdsl crosstalk.

There is also some other posts on this forum where the first upstream channels is left unused (0-100) if the line can get full sync speed without it.  I assume so poor vdsl lines can use those tones with less crosstalk.  I think bald eagle made some comments about it in another thread regarding U0.

Now i cant say for 100% sure its not related to a fault but I think its very unlikely.

Finally we do know he had local interference issues and now has to wait (probably for weeks) for DLM to revert his connection, only after that point (or a manual DLM reset) can a proper judgement be made but I expect at that point he will have full sync and be happy.

[ColinS]

I am surprised if you saying you have never seen a graph like his before, there is many like that posted on the internet, mine is the same here.

That's because I didn't.

Please try to read posts more carefully, then you wouldn't make so many wrong assumptions about what others are actually saying.

[napalmdaz]

Ok folks. Good stuff!

DLM has been busy undoing its changes. We are not there yet, but here are the latest graphs. We went away from Saturday until today and it seems the scheduled stats grabbing task crapped out on Sunday, hence the slew in the graphs. Overall it looks good and the main thing is that I'm getting some value from the 80/20 service now.

[Chrysalis]

looks much better now, and it seems DLM has been working fast.

you are on the 74mbit banding now which is the last one before the top 80mbit banding.

however until interleaving is removed you wont get full 80mbit sync.  So keep going as it is, dont disconnect it or power off.  It should eventually get to 80/20 fast path.

[napalmdaz]

Hi all,

Looks like we are cooking on gas now. Thanks for all the advise guys.

[kitz]

Past 6 days looks soooo much better

[napalmdaz]

Spoke too soon.

As soon as I remove stats gathering and relax I discover the sync has dropped this afternoon. I think I heard next door messing with power tools in the garden. It could have also been the washing machine.

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:   2
Max:   Upstream rate = 28653 Kbps, Downstream rate = 83556 Kbps
Path:   0, Upstream rate = 20000 Kbps, Downstream rate = 60393 Kbps

Link Power State:   L0
Mode:         VDSL2 Annex B
VDSL2 Profile:      Profile 17a
TPS-TC:         PTM Mode
Trellis:      U:ON /D:ON
Line Status:      No Defect
Training Status:   Showtime
      Down      Up
SNR (dB):    12.4       16.3
Attn(dB):    0.0       0.0
Pwr(dBm):    13.3       6.6
         VDSL2 framing
         Path 0
B:      239      237
M:      1      1
T:      64      45
R:      0      16
S:      0.1265      0.3782
L:      15181      5373
D:      1      1
I:      240      127
N:      240      254
         Counters
         Path 0
OHF:      4458803      2129636
OHFErr:      1387      6
RS:      0      1321611
RSCorr:      0      66
RSUnCorr:   0      0

         Path 0
HEC:      16554      0
OCD:      0      0
LCD:      0      0
Total Cells:   1051435335      0
Data Cells:   371657346      0
Drop Cells:   0
Bit Errors:   0      0

ES:      562      512
SES:      64      0
UAS:      205      205
AS:      9060

         Path 0
INP:      0.00      0.00
PER:      2.02      4.25
delay:      0.00      0.00
OR:      94.88      60.17

Bitswap:   36      87

Total time = 1 days 21 hours 39 min 16 sec
FEC:      0      0
CRC:      18773      0
ES:      562      512
SES:      64      0
UAS:      205      205
LOS:      36      0
LOF:      36      0
Latest 15 minutes time = 9 min 16 sec
FEC:      0      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
Previous 15 minutes time = 15 min 0 sec
FEC:      0      0
CRC:      0      0
ES:      0      1
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
Latest 1 day time = 21 hours 39 min 16 sec
FEC:      0      0
CRC:      15536      0
ES:      209      57
SES:      28      0
UAS:      16      16
LOS:      4      0
LOF:      5      0
Previous 1 day time = 24 hours 0 sec
FEC:      0      0
CRC:      146      0
ES:      119      59
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
Since Link time = 2 hours 30 min 59 sec
FEC:      0      66
CRC:      1387      6
ES:      49      6
SES:      1      0
UAS:      0      0
LOS:      0      0
LOF:      0      0

xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:   2
Max:   Upstream rate = 28653 Kbps, Downstream rate = 83556 Kbps
Path:   0, Upstream rate = 20000 Kbps, Downstream rate = 60393 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3959)
Medley Phase (Final) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3959)
       VDSL Port Details       Upstream        Downstream
Attainable Net Data Rate:      28653 kbps         83556 kbps
Actual Aggregate Tx Power:        6.6 dBm          13.3 dBm
============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):    4.4    18.7    27.0     N/A    10.2    22.7    34.3   
Signal Attenuation(dB):    4.4    17.7    25.9     N/A    10.2    22.7    34.3   
        SNR Margin(dB):    16.1    16.4    16.3     N/A    11.8    11.2    13.6   
         TX Power(dBm):   -7.6   -26.0    6.4     N/A    10.2    7.8    7.1   

[Chrysalis]

wait a day then resync it if the stats are the same tommorow, thats not DLM'd but it looks like you intermmently lost snr as you on a lower sync but now the available snr is there again, its not interleaved, and DLM typically doesnt take action in the day.  Resync it by pulling the power so a 'dying gasp' is sent to the dslam, DLM is supposed to ignore 'dying gasps'.

[napalmdaz]

Thanks!

Sync was the same this morning with no more CRC errors than yesterday (I assume thats what you guys noticed in the stats dump?). Pulled the power to the modem and aso rebooted the hub and we are back at 79999 sync

I think I'll keep the stats monitoring running full time from now on.

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:   0
Max:   Upstream rate = 28355 Kbps, Downstream rate = 83436 Kbps
Path:   0, Upstream rate = 20000 Kbps, Downstream rate = 79999 Kbps

Link Power State:   L0
Mode:         VDSL2 Annex B
VDSL2 Profile:      Profile 17a
TPS-TC:         PTM Mode
Trellis:      U:ON /D:ON
Line Status:      No Defect
Training Status:   Showtime
      Down      Up
SNR (dB):    6.9       15.0
Attn(dB):    0.0       0.0
Pwr(dBm):    13.6       6.6
         VDSL2 framing
         Path 0
B:      239      237
M:      1      1
T:      23      45
R:      0      16
S:      0.0955      0.3782
L:      20107      5373
D:      1      1
I:      240      127
N:      240      254
         Counters
         Path 0
OHF:      174767      67957
OHFErr:      0      0
RS:      0      3057362
RSCorr:      0      0
RSUnCorr:   0      0

         Path 0
HEC:      0      0
OCD:      0      0
LCD:      0      0
Total Cells:   44440776      0
Data Cells:   2438063      0
Drop Cells:   0
Bit Errors:   0      0

ES:      0      0
SES:      0      0
UAS:      18      18
AS:      290

         Path 0
INP:      0.00      0.00
PER:      1.64      4.25
delay:      0.00      0.00
OR:      116.56      60.17

Bitswap:   2      1

Total time = 5 min 8 sec
FEC:      0      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      18      18
LOS:      0      0
LOF:      0      0
Latest 15 minutes time = 5 min 8 sec
FEC:      0      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      18      18
LOS:      0      0
LOF:      0      0
Previous 15 minutes time = 0 sec
FEC:      0      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
Latest 1 day time = 5 min 8 sec
FEC:      0      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      18      18
LOS:      0      0
LOF:      0      0
Previous 1 day time = 0 sec
FEC:      0      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
Since Link time = 4 min 49 sec
FEC:      0      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0

xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:   0
Max:   Upstream rate = 28355 Kbps, Downstream rate = 83436 Kbps
Path:   0, Upstream rate = 20000 Kbps, Downstream rate = 79999 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3959)
Medley Phase (Final) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3959)
       VDSL Port Details       Upstream        Downstream
Attainable Net Data Rate:      28355 kbps         83436 kbps
Actual Aggregate Tx Power:        6.6 dBm          13.6 dBm
============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):    3.9    18.3    26.6     N/A    9.9    22.3    33.8   
Signal Attenuation(dB):    3.9    17.5    25.7     N/A    9.9    22.3    33.8   
        SNR Margin(dB):    15.5    15.0    15.0     N/A    6.9    6.9    7.0
         TX Power(dBm):   -8.0   -27.8    6.4     N/A    10.8    7.8    6.7   

[burakkucat]

Looking good, once again. 

[napalmdaz]

Hey guys,

The internet has been playing silly buggers, over the past few days, so I started the stats logging again. I swear something has changed in the stats shown below, specifically a new indicator for INPRein.

Could this be an automatic update to the HG612 software or a change at the cabinet? I'm a bit surprised if the software on the modem is being updated remotely.

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:   0
Last initialization procedure status:   0
Max:   Upstream rate = 29484 Kbps, Downstream rate = 87728 Kbps
Bearer:   0, Upstream rate = 19999 Kbps, Downstream rate = 75747 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):    6.3       15.1
Attn(dB):    14.8       0.0
Pwr(dBm):    13.4       6.5
         VDSL2 framing
         Bearer 0
MSGc:      18      26
B:      51      237
M:      1      1
T:      64      42
R:      12      16
S:      0.0218      0.3781
L:      23440      5374
D:      1483      1
I:      64      127
N:      64      254
         Counters
         Bearer 0
OHF:      54225657      2266269
OHFErr:      6      95
RS:      996685651      1859919
RSCorr:      104424      267
RSUnCorr:   8      0

         Bearer 0
HEC:      2      0
OCD:      0      0
LCD:      0      0
Total Cells:   2494559346      0
Data Cells:   887516251      0
Drop Cells:   0
Bit Errors:   0      0

ES:      2      86
SES:      0      0
UAS:      24      24
AS:      76103

         Bearer 0
INP:      3.00      0.00
INPRein:   0.00      0.00
delay:      8      0
PER:      1.40      3.98
OR:      136.80      64.22
AgR:      75883.57   20063.54

Bitswap:   22296/22296      741/741

Total time = 21 hours 8 min 47 sec
FEC:      104424      267
CRC:      6      95
ES:      2      86
SES:      0      0
UAS:      24      24
LOS:      0      0
LOF:      0      0
LOM:      0      0
Latest 15 minutes time = 8 min 47 sec
FEC:      0      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:      97      4
CRC:      0      2
ES:      0      2
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Latest 1 day time = 21 hours 8 min 47 sec
FEC:      104424      267
CRC:      6      95
ES:      2      86
SES:      0      0
UAS:      24      24
LOS:      0      0
LOF:      0      0
LOM:      0      0
Previous 1 day time = 0 sec
FEC:      0      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Since Link time = 21 hours 8 min 23 sec
FEC:      104424      267
CRC:      6      95
ES:      2      86
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0

xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:   0
Last initialization procedure status:   0
Max:   Upstream rate = 29484 Kbps, Downstream rate = 87728 Kbps
Bearer:   0, Upstream rate = 19999 Kbps, Downstream rate = 75747 Kbps

Discovery Phase (Initial) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3970)
Medley Phase (Final) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3970)
        VDSL Port Details        Upstream        Downstream
Attainable Net Data Rate:       29484 kbps          87728 kbps
Actual Aggregate Tx Power:          6.5 dBm           13.4 dBm
====================================================================================
   VDSL Band Status      U0      U1      U2      U3      U4      D1      D2      D3
  Line Attenuation(dB):    4.0    18.1    26.4     N/A     N/A    9.9    22.0    33.2   
Signal Attenuation(dB):    4.0    17.2    25.1     N/A     N/A    12.7    21.8    33.2   
      SNR Margin(dB):    15.1    15.1    15.1     N/A     N/A    6.3    6.3    6.3   
       TX Power(dBm):   -7.9   -25.6    6.4     N/A     N/A    10.4    7.9    7.0   

[ryant704]

That is a firmware update, there are various threads going on.

Check here

http://forum.kitz.co.uk/index.php/board,5.0.html

[napalmdaz]

Hi guys,

After a few happy months of faultless VDSL2, with attainable rates over 82000, I've started getting the intermittent loss of SNR problem in the afternoon again.

The original problem was fixed when the engineers couldn't find a fault at the time they were at the premises, but were shown the dslstats graphs with the daily resyncs. They decided to do a D and E side switch and the problem was solved.

On Thursday last week, the problem started again. There is a window in the afternoon, normally between 13:45 and 15:00, SNR drops through the floor and the HG612 resyncs at a lower speed. This has happened every day until today when something much worse happened.

It seemed last night the intererence wasn't confined to the afternoon but kicked in at around midnight until 9:15 this morning.

Could some engineers swapped my line back to a duff one again?