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[mofa2020]

Hello Kitizens, wishing you all happy holidays and a Merry Christmas 🎄🎅🏻.

So now it is the old mystery again but with getting line stats from the tp-link vr400 (v2) on dslstats * my package is 100/10 but recently my line sync. is 100/20 even on lower packages (could this be a DLM bug or some sort of testing line capability?)  ,, and now here is magic:

xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    0
Last initialization procedure status:   0
Max:    Upstream rate = 50476 Kbps, Downstream rate = 126422 Kbps
Bearer: 0, Upstream rate = 20480 Kbps, Downstream rate = 100015 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):        12.7            23.3
Attn(dB):        10.2            0.0
Pwr(dBm):        14.4            2.4

                        VDSL2 framing
                        Bearer 0
MSGc:           -6              -6
B:              178             162
M:              1               1
T:              0               0
R:              8               10
S:              0.0570          0.2529
L:              26260           5472
D:              16              4
I:              187             173
N:              187             173
Q:              16              4
V:              2               0
RxQueue:                51              39
TxQueue:                17              13
G.INP Framing:          18              18
G.INP lookback:         17              13
RRC bits:               24              24
                        Bearer 1
MSGc:           234             58
B:              0               0
M:              2               2
T:              2               2
R:              16              16
S:              4.5714          16.0000
L:              56              16
D:              3               1
I:              32              32
N:              32              32
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               0
OHFErr:         2               0
RS:             292016560               3950775483
RSCorr:         7232            1177
RSUnCorr:       0               0
                        Bearer 1
OHF:            14515606                15613244
OHFErr:         2               0
RS:             217733230               62452979
RSCorr:         24              0
RSUnCorr:       6               0

                        Retransmit Counters
rtx_tx:         212             3326472
rtx_c:          130             158
rtx_uc:         4               0

                        G.INP Counters
LEFTRS:         0               0
minEFTR:        99978           20425
errFreeBits:    381185590               9642577

                        Bearer 0
HEC:            0               0
OCD:            0               0
LCD:            0               0
Total Cells:    803226508               0
Data Cells:     379849663               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:             1               0
SES:            0               1
UAS:            28              28
AS:             249812

                        Bearer 0
INP:            45.00           38.00
INPRein:        0.00            0.00
delay:          0               0
PER:            0.00            0.00
OR:             0.01            0.01
AgR:            100155.07       20542.55

                        Bearer 1
INP:            3.00            4.00
INPRein:        3.00            4.00
delay:          2               0
PER:            17.20           16.06
OR:             111.56          31.87
AgR:            111.56  31.87

Bitswap:        178/178         2/2

Total time = 2 days 21 hours 24 min 0 sec
FEC:            7232            1177
CRC:            2               0
ES:             1               0
SES:            0               1
UAS:            28              28
LOS:            0               0
LOF:            0               0
LOM:            0               0
Retr:           0
FailedRetr:     0
FailedFastRetr: 0
Latest 15 minutes time = 9 min 0 sec
FEC:            3               0
CRC:            0               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Retr:           0
FailedRetr:     0
FailedFastRetr: 0
Previous 15 minutes time = 15 min 0 sec
FEC:            7               0
CRC:            0               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Retr:           N/A
FailedRetr:     N/A
FailedFastRetr: N/A
Latest 1 day time = 21 hours 24 min 0 sec
FEC:            720             361
CRC:            0               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Retr:           0
FailedRetr:     0
FailedFastRetr: 0
Previous 1 day time = 24 hours 0 sec
FEC:            3447            449
CRC:            0               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Retr:           0
FailedRetr:     0
FailedFastRetr: 0
Since Link time = 2 days 21 hours 23 min 31 sec
FEC:            7232            1177
CRC:            2               0
ES:             1               0
SES:            0               1
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Retr:           0
FailedRetr:     0
FailedFastRetr: 0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
~ #

Stats recorded 21 Dec 2020 19:31:45

DSLAM type / SW version:   HISI:0x3412 (52.18) / v0x3412
Modem/router firmware:     AnnexA version - A2pv6F039v2.d26m
DSL mode:                  VDSL2 Profile 17a
Status:                    Showtime
Uptime:                    2 days 21 hours 35 min 2 sec
Resyncs:                   0 (since 21 Dec 2020 18:06:42)
         
            Downstream   Upstream
Line attenuation (dB):     10.2      0.0
Signal attenuation (dB):   Not available on VDSL2      
Connection speed (kbps):   100015      20480
SNR margin (dB):           12.7      23.3
Power (dBm):               14.4      2.4
Interleave depth:          16      4
INP:                       45.00      38.00
G.INP:                     Enabled      Enabled
Vectoring status:          5 (VECT_UNCONFIGURED)      

RSCorr/RS (%):             0.0021      0.0000
RSUnCorr/RS (%):           0.0000      0.0000
ES/hour:                   0      0


Attached below the Bit-loading (though I guess it is missing the download/upload, if so I could use some help here DSLstats 6.5), Hlog and QLN graphs also anything else further needed to justify how this is even possible I happily will provide.

[digitalnemesis]

Who is your ISP?

[mofa2020]

I am not from UK, but though something may appear from behind figures and graphs that is causing the line to attain and sync. 100+mbps.

[Alex Atkin UK]

VDSL2 Profile 17a can sync up to 100/50, nothing really unusual about that other than your ISP not capping your upload as you expected.

I used to get 100/30 at 200m.

[mofa2020]

I used to get 100/30 at 200m.

Ah, Thanks for that I thought it is only theoretical and speeds are lower on actual provided service even the short lines.

[Alex Atkin UK]

Ah, Thanks for that I thought it is only theoretical and speeds are lower on actual provided service even the short lines.

Well it kinda is thanks to crosstalk.  As this was a failed local council project (it was ahead of its time and poorly advertised) so me and my friend were probably the only people on the cabinet.

While I cannot compare like for like (as that cabinet was removed due to the financial failure of the network), on the same line to a different cabinet (this time a standard BT/Openreach one) I'm only able to achieve 67/24.8 (limited to 67/20).

You can see the different states my line was in on that old network:


My current stats (not the same modem so the stats are formatted differently):

Code: [Select]

Chipset: Lantiq™ XWAY™ VRX268
Firmware Version: 5.8.1.8.1.6
API Version: 4.17.18.6
MEI Version: 1.5.17.6
Power Management Mode: L0 - Synchronized
Line State: UP [0x801: showtime_tc_sync]
Line Uptime: 110d 3h 51m 43s
Resyncs: 6
DSLAM/MSAN VID:
XTSE Capabilities: 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2
Annex: B
Line Mode: G.993.2 (VDSL2)
Profile: 17a
Trellis: D: ON / U: ON
Bitswap: D: ON / U: ON
G.INP: D: Not Enabled / U: Not Enabled
Virtual Noise Support: D: Not Supported / U: Not Supported
Attain Data Rate: 79.471 Mb/s / 24.835 Mb/s
Actual Data Rate: 67.000 Mb/s / 20.000 Mb/s
Impulse Noise Prot: 0.0 sym / 0.0 sym
Interleave Delay: 0.0 ms / 0.0 ms
NFEC: 255 / 255
RFEC: 16 / 16
LSYMB: 17979 / 5410
Interleave Depth: 1 / 1
Interleave Block: 255 / 255
LPATH: 0 / 0
Line Attenuation: 12.9dB / 15.9dB
Signal Attenuation: 12.9dB / 15.7dB
Noise Margin: 5.7dB / 8.0dB
Transmit power: 13.8dBm / 5.3dBm
FECS: 10950710 / 97226
ES: 4066 / 64698
SES: 0 / 18
LOSS: 5 / 0
UAS: 2147 / 2147
HEC: 0 / 0
CRC_P: 0 / 0
CRCP_P: 0 / 0
15m Code Violations: 0 / 0
15m FEC Errors: 0 / 0
1d Code Violations: 8 / 101
1d FEC Errors: 136 / 500
The higher attainable rate quoted above is due to my modem having an SNRm offset applied, so its calculating what I should sync at if DLM had not blocked my line from syncing below 6dB. 

[mofa2020]

Yes I see, my line attainable speed was ~155mbps but few months later it dropped to ~125mbps, I am connected to a small Huawei cabinet so I guess fewer lines means less cross-talk and I notice that when the power cut in my area the attainable speed jumps to ~150mbps again and SNR increases (my router powered by a UPS).

[burakkucat]

. . . I notice that when the power cut in my area the attainable speed jumps to ~150mbps again and SNR increases (my router powered by a UPS).

That is a definite indicator of cross-talk affecting your circuit.

[mofa2020]

That is a definite indicator of cross-talk affecting your circuit.

Yup, no vectoring applied (yet) hoping since my ISP is willing to provide 200mbps speed that would mean applying vectoring as there is no other way to do that on FTTC.

[Ronski]

VDSL2 Profile 17a can sync up to 100/50, nothing really unusual about that other than your ISP not capping your upload as you expected.

I used to get 100/30 at 200m.

Actually 17a has a theoretical maximum of 150/50Mbps. https://en.m.wikipedia.org/wiki/VDSL#VDSL2

[Alex Atkin UK]

Actually 17a has a theoretical maximum of 150/50Mbps. https://en.m.wikipedia.org/wiki/VDSL#VDSL2

Right I forgot, it can also do 100/100, but I don't think those settings have ever been used on an actual public telephone system.