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Author Topic: DLM nuked my connection , for no known reason  (Read 1962 times)

tommy45

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  • Posts: 627
DLM nuked my connection , for no known reason
« on: March 28, 2019, 04:16:11 PM »

Until 4am this morning  my modem had been in continuous sync for over 600 days and the sync was around 78mbps  it is now 74 ish mbps , that isn't the issue that hurts it's the sloooww ramp up in speed download throughput  and increased latency whilst watching online video , never had this poor performance before, the error rates where well within the dlm threshold under 100 most days and a max of around 150 if i had several incoming calls as when the phone rings a get a spike in errors (upstream) no ds errors , Here are the current Stats i can did out the previous if needed

Code: [Select]
xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 25353 Kbps, Downstream rate = 72964 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 73494 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): 6.2 15.1
Attn(dB): 13.7 0.0
Pwr(dBm): 12.4 2.2
VDSL2 framing
Bearer 0
MSGc: -6 26
B: 243 237
M: 1 1
T: 0 42
R: 10 16
S: 0.1057 0.3781
L: 19221 5374
D: 8 1
I: 254 127
N: 254 254
Q: 8 0
V: 0 0
RxQueue: 60 0
TxQueue: 20 0
G.INP Framing: 18 0
G.INP lookback: 20 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 199816
OHFErr: 0 1
RS: 29812312 4093598
RSCorr: 445 2
RSUnCorr: 0 0
Bearer 1
OHF: 49307 0
OHFErr: 0 0
RS: 492451 0
RSCorr: 0 0
RSUnCorr: 0 0

Retransmit Counters
rtx_tx: 431931 0
rtx_c: 21 0
rtx_uc: 0 0

G.INP Counters
LEFTRS: 0 0
minEFTR: 73501 0
errFreeBits: 887821 0

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 111900477 0
Data Cells: 3942087 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: 25 25
AS: 793

Bearer 0
INP: 49.00 0.00
INPRein: 0.00 0.00
delay: 0 0
PER: 0.00 3.98
OR: 0.01 64.22
AgR: 73569.68 20063.54

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: 9/9 0/0

Total time = 13 min 38 sec
FEC: 445 2
CRC: 0 1
ES: 0 1
SES: 0 0
UAS: 25 25
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 15 minutes time = 13 min 38 sec
FEC: 445 2
CRC: 0 1
ES: 0 1
SES: 0 0
UAS: 25 25
LOS: 0 0
LOF: 0 0
LOM: 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
LOM: 0 0
Latest 1 day time = 13 min 38 sec
FEC: 445 2
CRC: 0 1
ES: 0 1
SES: 0 0
UAS: 25 25
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 = 13 min 13 sec
FEC: 445 2
CRC: 0 1
ES: 0 1
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
#
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re0

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  • Posts: 840
Re: DLM nuked my connection , for no known reason
« Reply #1 on: March 28, 2019, 05:17:12 PM »

Doesn't look like the DLM "nuked" your connection. 600 days is quite a long time, so conditions would have certainly changed since then. 4 Mbps drop over that period of time could be anything.

As for the "poor" performance, it's not going to be anything related to the DLM; it seems to be nothing more than a coincidence. Don't know which ISP you are on, but perhaps after authenticating you have gotten poor(er) routing or on a congested link somewhere.

Small spike in upstream errors can happen with incoming calls, and can be caused by poor filtering (broadband and POTS signals not properly filtered from eachother).
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ISP: Gigaclear - Hyperfast 900 (up to 940 Mbps symmetrical)

Alex Atkin UK

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    • Thinkbroadband Quality Monitors
Re: DLM nuked my connection , for no known reason
« Reply #2 on: March 29, 2019, 09:48:44 PM »

I would have to agree.  A slow "ramp up" or complete lack of hitting your normal speed is almost certainly contention issues at your ISP.

As for a drop in speed, I lost 10Mbit overnight at some random point in the past due to crosstalk.  I also lost another 2Mbit recently due to getting VDSL activated on the second pair in my drop wire.  So a loss of 2Mbit could be margin of error (every resync can vary) or just another customer coming online in the area.
« Last Edit: March 29, 2019, 09:51:59 PM by Alex Atkin UK »
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Broadband: Zen Full Fibre 900 + Three 5G Routers: pfSense (Intel N100) + Huawei CPE Pro 2 H122-373 WiFi: Zyxel NWA210AX
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tommy45

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Re: DLM nuked my connection , for no known reason
« Reply #3 on: March 30, 2019, 11:50:42 AM »

Well, i wouldn't blame the ISP so quickly as i'm WBMC not on Zen's GEA  for transit,  And after a chat with their tech yesterday i was told that the initial drop , re sync  may have been caused by BTW doing some load balancing, Which i'm very skeptical about, but i have been on BT hot vlan's before , but not had these issues,. Zen's line rate data is not updating  so it thinks i'm syncing at 69mbps  and is now restricting my throughput because my current sync as of this morning  is now 76.5mbps  but through put is still limited to 65mbps  as it was yesterday sync was 73.5 mbps , even the BT availability checker reported (updated yesterday) it as 73.5 but zen says 69???

Here is a snap shot of what  the latency  was like , under normal use and has looked like for the 5 years i have had vdsl2
https://www.thinkbroadband.com/broadband/monitoring/quality/share/08e0a9db83bf9972ef99ef5d7d3a6f4d6038c258-27-03-2019

And one that shows what it's like now it's borked https://www.thinkbroadband.com/broadband/monitoring/quality/share/e9981fe0fd44f98e7ca67e11a00abbddba62a4af-28-03-2019


 Looks like DLM has decreased my SNR to 5db Current stats:
Code: [Select]
xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 26861 Kbps, Downstream rate = 75848 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 76523 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): 5.3 15.2
Attn(dB): 13.7 0.0
Pwr(dBm): 12.5 3.6
VDSL2 framing
Bearer 0
MSGc: -6 26
B: 243 237
M: 1 1
T: 0 42
R: 10 16
S: 0.1015 0.3781
L: 20013 5374
D: 8 1
I: 254 127
N: 254 254
Q: 8 0
V: 0 0
RxQueue: 84 0
TxQueue: 21 0
G.INP Framing: 18 0
G.INP lookback: 21 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 943144
OHFErr: 0 1
RS: 146844984 939859
RSCorr: 109 38
RSUnCorr: 0 0
Bearer 1
OHF: 233027 0
OHFErr: 0 0
RS: 2329650 0
RSCorr: 0 0
RSUnCorr: 0 0

Retransmit Counters
rtx_tx: 432248 0
rtx_c: 8 0
rtx_uc: 0 0

G.INP Counters
LEFTRS: 0 0
minEFTR: 76528 0
errFreeBits: 4368100 0

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 550777707 0
Data Cells: 19119838 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: 24 24
AS: 3743

Bearer 0
INP: 50.00 0.00
INPRein: 1.00 0.00
delay: 0 0
PER: 0.00 3.98
OR: 0.01 64.22
AgR: 76601.12 20063.54

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: 469/469 1/1

Total time = 1 hours 2 min 47 sec
FEC: 109 38
CRC: 0 1
ES: 0 1
SES: 0 0
UAS: 24 24
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 15 minutes time = 2 min 47 sec
FEC: 5 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: 23 11
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 = 1 hours 2 min 47 sec
FEC: 109 38
CRC: 0 1
ES: 0 1
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 = 1 hours 2 min 23 sec
FEC: 109 38
CRC: 0 1
ES: 0 1
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
#
« Last Edit: March 30, 2019, 12:40:45 PM by tommy45 »
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j0hn

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  • Posts: 4093
Re: DLM nuked my connection , for no known reason
« Reply #4 on: March 30, 2019, 01:48:59 PM »

BTw load balancing (or them doing ANYTHING actually) wouldn't cause a resync. Only the PPP would be affected by BTw.

OpenReach are the only ones who would be able to kill the xDSL link and initiate a resync.
I'm not aware of them ever remotely resyncing a line, everything is left to the DLM.

Quote
Well, i wouldn't blame the ISP so quickly as i'm WBMC not on Zen's GEA  for transit

Any reason you think WBMC can't be congested?

The decrease is sync appears to be crosstalk and any throughput issues are a coincidence on timing and are likely down to the ISP/backhaul.

The move to 5dB is very positive.
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tommy45

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  • Posts: 627
Re: DLM nuked my connection , for no known reason
« Reply #5 on: March 30, 2019, 02:34:47 PM »

Zen's line data which is the sync rate and associated  Bras IP profile is wrong  so the info from BT is wrong , it 's shows a IP profile of 66.81 and sync rate of 69032, When the actual sync rate is 76523 Even with high retx my IP profile should be higher
Zen are going to get BT to sort out that vlan issue and hopefully the stuck profile

Update: Dlm has since decreased the target ds margin  to 4db  and i now have nearely a full sync rate again

Code: [Select]
xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 27151 Kbps, Downstream rate = 79056 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 79952 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): 4.2 15.2
Attn(dB): 13.7 0.0
Pwr(dBm): 12.3 3.6
VDSL2 framing
Bearer 0
MSGc: -6 26
B: 243 237
M: 1 1
T: 0 42
R: 10 16
S: 0.0972 0.3781
L: 20910 5374
D: 8 1
I: 254 127
N: 254 254
Q: 8 0
V: 0 0
RxQueue: 88 0
TxQueue: 22 0
G.INP Framing: 18 0
G.INP lookback: 22 0
RRC bits: 0 24
Bearer 1
MSGc: 186 -6
B: 0 0
M: 2 0
T: 2 0
R: 16 0
S: 5.3333 0.0000
L: 48 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 1598348
OHFErr: 0 37
RS: 2323705184 2508700
RSCorr: 12014 274
RSUnCorr: 0 0
Bearer 1
OHF: 3528404 0
OHFErr: 0 0
RS: 42340109 0
RSCorr: 3 0
RSUnCorr: 0 0

Retransmit Counters
rtx_tx: 433034 0
rtx_c: 766 0
rtx_uc: 46448 0

G.INP Counters
LEFTRS: 10 0
minEFTR: 79944 0
errFreeBits: 575516241 0

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 124065415 0
Data Cells: 79347996 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: 11 185
SES: 11 0
UAS: 57 46
AS: 56676

Bearer 0
INP: 50.00 0.00
INPRein: 1.00 0.00
delay: 0 0
PER: 0.00 3.98
OR: 0.01 64.22
AgR: 80034.45 20063.54

Bearer 1
INP: 4.00 0.00
INPRein: 4.00 0.00
delay: 3 0
PER: 16.06 0.01
OR: 95.62 0.01
AgR: 95.62 0.01

Bitswap: 7451/7451 3/3

Total time = 1 days 4 hours 1 min 43 sec
FEC: 135542 1563
CRC: 555 200
ES: 11 185
SES: 11 0
UAS: 57 46
LOS: 1 0
LOF: 9 0
LOM: 0 0
Latest 15 minutes time = 1 min 43 sec
FEC: 10 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: 133 4
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 = 4 hours 1 min 43 sec
FEC: 2338 91
CRC: 0 13
ES: 0 12
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 13973 464
CRC: 555 64
ES: 11 59
SES: 11 0
UAS: 33 22
LOS: 1 0
LOF: 9 0
LOM: 0 0
Since Link time = 15 hours 44 min 35 sec
FEC: 12014 274
CRC: 0 37
ES: 0 34
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
#
But I still have a slow ramp up of ds throughput both single and also multiple streams,According to zen support, BTW detected the Vlan i was on was running hot, so initiated a change of vlan i'm supposed to be on a new 10gb vlan with only a few users) and the BT bras profile is still not correct In the Zen portal the info on my current sync rate and IP profile is wrong again,69878 BT IP profile 72192 sync rate, And throughput is sub 70mbps

Looks like the Vlan i was on got changed  at around 1am  the slow ramp up and high level of jitter /latency when watching video (youtube) seems to be resolved, will need to evaluate d/s throughput consistency during evening peak time's to get a good idea if the vlan is good or not, but my max throughput has increased a little but BT are still supplying the incorrect line data info to Zen the latest is 75764 sync rate with a IP profile of 73.33mbps when there was no Re sync or loss of sync at 1am only a drop in PPPOE session when the vlan was re jigged
« Last Edit: April 03, 2019, 10:42:43 AM by tommy45 »
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