Kitz Forum
Broadband Related => ADSL Issues => Topic started by: Weaver on June 11, 2020, 01:43:40 AM
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Nightmare. I have noticed that line #2 is now showing the symptoms that line #4 exhibited. Can’t tell when this started.
- The same strange depression in the SNR-vs-tone graph (https://forum.kitz.co.uk/index.php?action=dlattach;topic=24830.0;attach=28794;image) as seen in line #4 (https://forum.kitz.co.uk/index.php?action=dlattach;topic=24614.0;attach=28426;image), again in the region of tones 40-80
- Reduction in downstream sync speed,
- Upstream rate unaffected,
- Too many downstream CRC errors and ES
The downstream sync rate has dropped from 2.7Mbps to 2.593Mbps following a resynch. Live sync rates:
#1: down 2807 kbps, up 519 kbps
#2: down 2593 kbps, up 547 kbps
#3: down 2964 kbps, up 389 kbps
#4: down 2861 kbps, up 528 kbps
Here is the SNR-vs-tone graph for line #2. Note that for some reason the upstream (in green) values are all zero in this graph.
(https://forum.kitz.co.uk/index.php?action=dlattach;topic=24830.0;attach=28794;image)
I have reported this to AA and they are looking into it. They ran some tests which gave now-you-see-them-now-you-don’t error reports.
Here are the line #2 detailed stats:
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason: 8000
Last initialization procedure status: 0
Max: Upstream rate = 499 Kbps, Downstream rate = 2800 Kbps
Bearer: 0, Upstream rate = 547 Kbps, Downstream rate = 2593 Kbps
Link Power State: L0
Mode: ADSL2 Annex A
TPS-TC: ATM Mode(0x0)
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 2.8 5.8
Attn(dB): 65.0 41.6
Pwr(dBm): 18.3 12.4
ADSL2 framing
Bearer 0
MSGc: 55 12
B: 28 62
M: 8 1
T: 3 1
R: 16 14
S: 2.8182 3.6235
L: 704 170
D: 1 8
Counters
Bearer 0
SF: 2433900 361928
SFErr: 99 15
RS: 55675468 569814
RSCorr: 85423 4270
RSUnCorr: 100 0
ReXmt: 89281 0
ReXmtCorr: 89276 0
ReXmtUnCorr: 110 0
Bearer 0
HEC: 109 18
OCD: 0 0
LCD: 0 0
Total Cells: 240910173 50935074
Data Cells: 91903637 10195572
Drop Cells: 0
Bit Errors: 3868 1572
ES: 171 18
SES: 26 0
UAS: 124 99
AS: 39456
Bearer 0
INP: 28.00 2.50
INPRein: 0.00 0.00
delay: 8 7
PER: 16.11 16.30
OR: 30.27 8.83
AgR: 2612.76 554.19
Bitswap: 9547/9882 132/132
Total time = 22 hours 5 min 59 sec
FEC: 156127 7357
CRC: 1155 21
ES: 171 18
SES: 26 0
UAS: 124 99
LOS: 1 0
LOF: 9 0
LOM: 0 0
Latest 15 minutes time = 5 min 59 sec
FEC: 894 2
CRC: 4 0
ES: 3 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: 1989 12
CRC: 2 0
ES: 2 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 22 hours 5 min 59 sec
FEC: 156127 7357
CRC: 1155 21
ES: 171 18
SES: 26 0
UAS: 124 99
LOS: 1 0
LOF: 9 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 = 10 hours 57 min 35 sec
FEC: 85423 4270
CRC: 99 15
ES: 96 13
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
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Oh, yuck. :yuck:
Acknowledging the current problem but there is nothing new I can add. :(
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The line 2 problem has worsened slightly, by about 2dB is my best guess.
Speed is currently : 2.362 Mbps downstream @ 3.1 dB SNRM, 544 kbps upstream @ 5.9 dB SNRM. Should be around 2.8 Mbps downstream if not more.
Here’s the SNR vs tones graph for line 2:
(https://i.postimg.cc/hjJmBcQJ/E7605049-D9-B2-4-BDB-AF5-E-FA74-B0-B0-CE53.png)
Full stats:
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason: 8000
Last initialization procedure status: 0
Max: Upstream rate = 502 Kbps, Downstream rate = 2572 Kbps
Bearer: 0, Upstream rate = 544 Kbps, Downstream rate = 2362 Kbps
Link Power State: L0
Mode: ADSL2 Annex A
TPS-TC: ATM Mode(0x0)
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 3.0 5.9
Attn(dB): 65.5 41.9
Pwr(dBm): 18.1 12.4
ADSL2 framing
Bearer 0
MSGc: 51 12
B: 27 62
M: 8 1
T: 3 1
R: 16 14
S: 2.9860 3.6450
L: 643 169
D: 1 8
Counters
Bearer 0
SF: 145774 142846
SFErr: 20 3
RS: 3115940 2570288
RSCorr: 9258 204
RSUnCorr: 20 0
ReXmt: 11049 0
ReXmtCorr: 11048 0
ReXmtUnCorr: 21 0
Bearer 0
HEC: 21 9
OCD: 0 0
LCD: 0 0
Total Cells: 13012448 3005373
Data Cells: 235369 82893
Drop Cells: 0
Bit Errors: 1448 164
ES: 6595 721
SES: 113 0
UAS: 524 430
AS: 2345
Bearer 0
INP: 26.00 2.50
INPRein: 0.00 0.00
delay: 8 7
PER: 15.95 16.40
OR: 28.57 8.77
AgR: 2380.51 550.93
Bitswap: 532/557 2/2
Total time = 58 days 18 hours 11 min 44 sec
FEC: 1385583 370765
CRC: 14238 1102
ES: 6595 721
SES: 113 0
UAS: 524 430
LOS: 6 0
LOF: 27 0
LOM: 32 0
Latest 15 minutes time = 11 min 44 sec
FEC: 2736 52
CRC: 4 0
ES: 4 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: 3599 132
CRC: 8 3
ES: 8 2
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 18 hours 11 min 44 sec
FEC: 353952 2108
CRC: 6496 3
ES: 4332 2
SES: 0 0
UAS: 59 59
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 203696 2718
CRC: 369 3
ES: 359 3
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 39 min 3 sec
FEC: 9258 204
CRC: 20 3
ES: 20 2
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
The current attenuation figures are : 65.5 dB downstream ; 41.9 dB upstream. Notice how much they have increased (worsened) since the time when the previous stats were captured: 65.0 dB ; 41.6 dB
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I would normally ignore a 0.3 - 0.5 dB change in relative values. But in your case, at the extreme limits of the technology, they have to be acknowledged.
:wall: I'll do it for you . . .
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How can I find the current FTR ? (Or MSR of course) Where should I look?
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I wonder if A&A have the means to query the BTW systems for those values? :-\
[Edited to insert a missing word.]
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Thank you for jogging my memory! I suddenly thought where I might so find it given. A&A’s remote query "Sync Status" is a function that is available in the control server clueless.aa.net.uk and it reports the following today for line 2:
BT Test xDSL Status Check:Pass Standalone sub test passed successfully.Pass OK. Circuit In Sync
BRAS=2083kb/s FTR=2278kb/s MSR=2848kb/s ServOpt=1 I/L=I
A SERVICE OPTION CHANGE ORDER IS IN PROGRESS ON THIS LINE
Up Sync=544kb/s LoopLoss=41.9dB SNR=6.1dB ErrSec=0 HECErr=0 Cells=0
Down Sync=2362kb/s LoopLoss=65.5dB SNR=3.1dB ErrSec=0 HECErr=N/A Cells=0
And for line 4:
BT Test xDSL Status Check:Pass Standalone sub test passed successfully.Pass OK. Circuit In Sync
BRAS=2498kb/s FTR=2278kb/s MSR=2848kb/s ServOpt=1 I/L=I
A SERVICE OPTION CHANGE ORDER IS IN PROGRESS ON THIS LINE
Up Sync=550kb/s LoopLoss=41.7dB SNR=6.1dB ErrSec=0 HECErr=0 Cells=0
Down Sync=2832kb/s LoopLoss=65dB SNR=2.4dB ErrSec=0 HECErr=N/A Cells=0
I wish I knew exactly what the definition is. Does it mean that you have to have a downstream target SNRM of 6dB ? Because without some standard then it’s wildly variable of course. This downstream sync rate in both cases is with a target SNRM of 3dB.
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I suspect that a target SNRM of 6 dB is used to provide "base line values".
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The state of the lines now is - Live sync rates:
#1: down 2730 kbps, up 519 kbps
#2: down 2409 kbps, up 512 kbps
#3: down 2927 kbps, up 376 kbps
#4: down 2310 kbps, up 553 kbps