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Author Topic: Drop in sync  (Read 770 times)

banger

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Drop in sync
« on: July 09, 2018, 08:58:56 PM »

For months, I think the beginning of the year I have had a downstream sync of 79999 but today I had a resync. Admittedly I was running a downstream SNRM of 0.8db with attainable of 73999. Today after the resync I am now syncing at 66799 @ 3.4dB. Here's my stats :-

Code: [Select]
adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    0
Last initialization procedure status:   0
Max:    Upstream rate = 14675 Kbps, Downstream rate = 67327 Kbps
Bearer: 0, Upstream rate = 14675 Kbps, Downstream rate = 66799 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):        3.3             6.2
Attn(dB):        20.0            0.0
Pwr(dBm):        12.6            7.4

                        VDSL2 framing
                        Bearer 0
MSGc:           -6              26
B:              243             237
M:              1               1
T:              0               64
R:              10              16
S:              0.0000          0.5159
L:              17470           3939
D:              8               1
I:              254             127
N:              254             254
Q:              8               0
V:              0               0
RxQueue:                76              0
TxQueue:                19              0
G.INP Framing:          18              0
G.INP lookback:         19              0
RRC bits:               0               24
                        Bearer 1
MSGc:           154             -6
B:              0               0
M:              2               0
T:              2               0
R:              16              0
S:              6.4000          0.0000
L:              40              0
D:              3               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               225338
OHFErr:         0               1
RS:             63647560                1528273
RSCorr:         3876            1
RSUnCorr:       0               0
                        Bearer 1
OHF:            115735          0
OHFErr:         0               0
RS:             1156731         0
RSCorr:         0               0
RSUnCorr:       0               0

                        Retransmit Counters
rtx_tx:         30951779                0
rtx_c:          5               0
rtx_uc:         0               0

                        G.INP Counters
LEFTRS:         0               0
minEFTR:        66809           0
errFreeBits:    1894318         0

                        Bearer 0
HEC:            0               0
OCD:            0               0
LCD:            0               0
Total Cells:    238806507               0
Data Cells:     252989          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:             0               1
SES:            0               0
UAS:            37              37
AS:             1860

                        Bearer 0
INP:            52.00           0.00
INPRein:        1.00            0.00
delay:          0               0
PER:            0.00            8.28
OR:             0.01            30.89
AgR:            66867.61        14706.05

                        Bearer 1
INP:            4.50            0.00
INPRein:        4.50            0.00
delay:          3               0
PER:            16.06           0.01
OR:             79.68           0.01
AgR:            79.68   0.01

Bitswap:        372/372         8/8

Total time = 31 min 37 sec
FEC:            3876            1
CRC:            0               1
ES:             0               1
SES:            0               0
UAS:            37              37
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 15 minutes time = 1 min 37 sec
FEC:            243             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:            1949            1
CRC:            0               1
ES:             0               1
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 1 day time = 31 min 37 sec
FEC:            3876            1
CRC:            0               1
ES:             0               1
SES:            0               0
UAS:            37              37
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 = 30 min 59 sec
FEC:            3876            1
CRC:            0               1
ES:             0               1
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
 >

Anything I can do? Seems a heck of a drop after 1 resync.

[Moderator edited to enclose the data within a pair of [code][/code] tags.]
« Last Edit: July 13, 2018, 05:06:21 PM by burakkucat »
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Tim
www.uno.net.uk & freenetname
Asus DSL-N55U and ZyXEL VMG1312-B10A Bridge on 80 Meg TTB Fibre

https://www.thinkbroadband.com/speedtest/1502566996147131655

banger

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Re: Drop in sync
« Reply #1 on: July 09, 2018, 11:18:36 PM »

Tried swapping VMG-1312-B10A but same sync or thereabouts. Worth a swap. Hmmm.
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Tim
www.uno.net.uk & freenetname
Asus DSL-N55U and ZyXEL VMG1312-B10A Bridge on 80 Meg TTB Fibre

https://www.thinkbroadband.com/speedtest/1502566996147131655

tubaman

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  • Posts: 2253
Re: Drop in sync
« Reply #2 on: July 10, 2018, 08:45:23 AM »

To me those stats look perfectly ok. With G.INP and 3dB on the downstream side I don't think you'll get any more speed.
Perhaps a new cross-talker has caused the reduction, but there's not much you can do about it if that has happened.
I'd be tempted to leave it alone for now as you know that the VMG1312-B10A gives good results on your line.
 :)
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BT FTTC 80/20 Huawei Cab - Netgear D6220

spring

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  • Posts: 322
Re: Drop in sync
« Reply #3 on: July 10, 2018, 09:35:01 AM »

i've had my SNR unexpectedly change over a week ago as well, and did cause a resync. this led my line to be back to how it was last year, with an SNR of 29~, from ~25, and evidently caused by interference. how does your snr graph look? current SNR, HLog and QLN along your previous, you can upload all of this on imgur or other site. i'm saying this because it's easy to upload and there's no other stat that shows interference [not errors].
« Last Edit: July 10, 2018, 09:39:38 AM by spring »
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No one knows what is the taste of the void.

j0hn

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Re: Drop in sync
« Reply #4 on: July 10, 2018, 01:16:31 PM »

Sounds like a new crosstalker came online today.
It dropped your snr so low it caused a resync.

Looks like that crosstalker has taken about 8Mb off your line.
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BT FTTC 55/10 ECI now Huawei cab
Zyxel VMG1312-B10A bridge mode with 1508 MTU + Asus RT-AC68U running Asuswrt-Merlin

jaydub

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  • Posts: 224
Re: Drop in sync
« Reply #5 on: July 10, 2018, 05:05:23 PM »

Sounds like a new crosstalker came online today.
It dropped your snr so low it caused a resync.

Looks like that crosstalker has taken about 8Mb off your line.
How does crosstalk manifest itself in other graphs?

By changes to the noise floor on the QLN graph?

Asking because I am seeing a drop in max attainable and SNRM, but can't see any discernible differences in the QLN graph.

Sent from my EVA-L09 using Tapatalk

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banger

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  • Uno comms 80/20
Re: Drop in sync
« Reply #6 on: July 10, 2018, 08:54:30 PM »

Here is my QLN and HLOG for the more experienced in these things.
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Tim
www.uno.net.uk & freenetname
Asus DSL-N55U and ZyXEL VMG1312-B10A Bridge on 80 Meg TTB Fibre

https://www.thinkbroadband.com/speedtest/1502566996147131655

banger

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  • Posts: 775
  • Uno comms 80/20
Re: Drop in sync
« Reply #7 on: July 13, 2018, 02:17:51 AM »

Slight increase to 67 after a manual resync. Also noticed upstream sync has dropped from around 17 to 14 would this also indicate a crosstalker. Either way cant see OR doing anything about it as it is within A and B estimates.
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Tim
www.uno.net.uk & freenetname
Asus DSL-N55U and ZyXEL VMG1312-B10A Bridge on 80 Meg TTB Fibre

https://www.thinkbroadband.com/speedtest/1502566996147131655

parkdale

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  • Posts: 238
Re: Drop in sync
« Reply #8 on: July 13, 2018, 09:04:02 AM »

@ Banger, your attenuation is the same as mine but you've got a lot more download speed  :) :) :) I must have quite a few neigbours camping on my line :( 
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tubaman

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Re: Drop in sync
« Reply #9 on: July 13, 2018, 09:34:19 AM »

@parkdale - you have neither G.INP or 3dB SNR on your downstream side (@banger has both) and these together give a significant increase in attainable speed.
 :)
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BT FTTC 80/20 Huawei Cab - Netgear D6220

parkdale

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Re: Drop in sync
« Reply #10 on: July 13, 2018, 07:17:24 PM »

ECI cab  :'( 
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