Not crosstalk.
DLM has capped/banded the downstream at 6.4Mb.

The stats suggest the line will sync higher if the cap wasn't in place.

Can you post the full output of the Telnet Data > Connection Stats tab on DslStats?

Here we go...

xdslctl info --stats
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 1169 Kbps, Downstream rate = 8478 Kbps
Bearer: 0, Upstream rate = 1169 Kbps, Downstream rate = 6399 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): 10.1 6.3
Attn(dB): 36.2 0.0
Pwr(dBm): 4.0 10.4

VDSL2 framing
Bearer 0
MSGc: -6 26
B: 65 31
M: 1 1
T: 0 54
R: 6 0
S: 0.3238 0.8562
L: 1779 299
D: 2 1
I: 72 32
N: 72 32
Q: 2 0
V: 0 0
RxQueue: 108 0
TxQueue: 27 0
G.INP Framing: 18 0
G.INP lookback: 27 0
RRC bits: 0 24
Bearer 1
MSGc: 90 -6
B: 0 0
M: 2 0
T: 2 0
R: 16 0
S: 10.6667 0.0000
L: 24 0
D: 1 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 6388503
OHFErr: 57 0
RS: 908276026 344799940
RSCorr: 128628 0
RSUnCorr: 0 0
Bearer 1
OHF: 4595050 0
OHFErr: 0 0
RS: 27569930 0
RSCorr: 951 0
RSUnCorr: 0 0

Retransmit Counters
rtx_tx: 89293 0
rtx_c: 67685 0
rtx_uc: 1666 0

G.INP Counters
LEFTRS: 10 0
minEFTR: 6398 0
errFreeBits: 7158503 0

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 908106937 0
Data Cells: 40634600 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: 33 0
SES: 2 0
UAS: 28 28
AS: 73819

Bearer 0
INP: 51.00 0.00
INPRein: 1.00 0.00
delay: 0 0
PER: 0.00 11.60
OR: 0.01 22.06
AgR: 6497.61 1191.34

Bearer 1
INP: 2.50 0.00
INPRein: 2.50 0.00
delay: 0 0
PER: 16.06 0.01
OR: 47.81 0.01
AgR: 47.81 0.01

Bitswap: 50782/50783 0/0

Total time = 20 hours 30 min 47 sec
FEC: 128628 0
CRC: 57 0
ES: 33 0
SES: 2 0
UAS: 28 28
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 0
HostInitRetr: 0
FailedRetr: 0
Latest 15 minutes time = 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
Retr: 0
HostInitRetr: 0
FailedRetr: 0
Previous 15 minutes time = 15 min 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
Retr: N/A
HostInitRetr: N/A
FailedRetr: N/A
Latest 1 day time = 20 hours 30 min 47 sec
FEC: 128628 0
CRC: 57 0
ES: 33 0
SES: 2 0
UAS: 28 28
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 0
HostInitRetr: 0
FailedRetr: 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
Retr: 0
HostInitRetr: 0
FailedRetr: 0
Since Link time = 20 hours 30 min 17 sec
FEC: 128628 0
CRC: 57 0
ES: 33 0
SES: 2 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 0
HostInitRetr: 0
FailedRetr: 0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
$

The line should sync at the max attainable figure, or just slightly under it.

It's a Huawei cabinet with G.INP enabled so the max attainable is pretty accurate (unlike with INP/Interleaving enabled).

DLM caps the line for too many resyncs in a set time period.
So anything that caused the power to go on/off repeatedly or perhaps rebooting the modem repeatedly.

I'm not sure if ISP's still have the ability to request a remote DLM reset as that scheme was coming to an end.

It might need an on site OpenReach engineer to reset the DLM but it's not easy to convince the ISP to send 1 out when you are within the estimates.

The line is definitely capped at 6.4Mb though.
Every resync will result in a 6399 sync with SNRM above 6dB.

If you can't get the DLM reset then my advice is leave the modem in sync at all times. This makes it more likely DLM will remove the cap.

Tinkering/rebooting the router makes no difference to the DLM but rebooting the modem is treated as the line being unstable.

Edited by j0hn83 (Tue 13-Aug-19 14:33:30)

I have a feeling it was the recent summer thunderstorms. We had power outages, lightning strikes and similar in the area for a few days.

I have reset the modem about three times in the past week and noticed the 6399 remained so I guess I am capped until it stabilizes.

Still stuck at 6399 down at the moment despite an automatic resync last night when the upload speed nudged down a couple of bytes. Fingers crossed the DLM will unbunch its panties in a couple of days.

I have a scheduled all-day powercut on next Monday so if it hasn't released the speed by the end of that I will have to phone it in. My TBB Speed Test results are down to 4.8Mbps down, 0.9 up with 80ms latency which is the worst they have ever been.

https://www.thinkbroadband.com/_assets/speedtest/but...