I've had a similar ~60 to ~75 speed increase and my current downstream SNR is 3.3db.

When first installed (my line was the first one on the cabinet) the sync speed was over 100Mb (unfortunately I did not take screenshot) and over time as more people got FTTC my speed dropped to ~60 which I assume was mostly due to crosstalk. It's nice to be back to nearly 80Mb

You cannot have a sync speed of over 100 Mb on VDSL2 connections in the UK...

Not sure that's right. According to Table 6-1 - VDSL2 profiles in G.993.2, 100 Mbit/s is the "Minimum bidirectional net data rate capability" rather than the maximum. There was also a comment in this message on Kitz that calculated the theoretical maximum of the 17a profile as 246 Mbit/s:

"The 17MHz VDSL2 profile (17a) uses 4095 tones, with an effective symbol rate of 4kHz. This gives the following total system capacity: 4000 DMT symbols/s * 4095 tones/symbol * 15 bits/tone = 246Mbps to be shared between the two directions."

Yes, I fully well know that it's POSSIBLE to achieve those speeds, but all Openreach products are capped at 80/20!

Edited by deleted (Sat 09-Sep-17 12:27:49)

It should be enabled on all Huawei 384HD cabs simply to aid with crosstalk.

Agreed.

All Openreach VDSL2 products are capped at 80000 Kbps downstream.

Others are at liberty to run at different caps, e.g. Digital Region used to see the odd 100 Mbps user

That's exactly what I said...

In reply to a post by bsdnazz:

When first installed (my line was the first one on the cabinet) the sync speed was over 100Mb

As others have said, that is not possible as the Openreach product is "hard"-capped at 80Mbps.

This is a common misreading people make of the line statistics. You will have been looking at the "Max attainable" or similarly titled line, which is the speed it could sync at if Openreach allowed such a sync.

Right so can anyone explain how after 1 week of my connection going to max 80mbit speed and snr gaining another 2db why on Sunday my connection dropped 2db meaning i had 1.3snr from 3.3 obviously causing mass errors and forcing me to reconnect.

After doing a reboot i find my line is now back at 73mbit where it was the week before ?! can't be cross talk so how can a line do 80mbit where it never had since i got fttc 3 years ago do it for one week totally fine then go back to 73mbit ?

Surely that shows there is a problem somewhere.

Here are my stats as of today

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 23804 Kbps, Downstream rate = 73192 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 73464 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 15.0
Attn(dB): 15.3 0.0
Pwr(dBm): 14.0 6.7
VDSL2 framing
Bearer 0
MSGc: -6 26
B: 243 237
M: 1 1
T: 0 42
R: 10 16
S: 0.1058 0.3781
L: 19213 5374
D: 8 1
I: 254 127
N: 254 254
Q: 8 0
V: 0 0
RxQueue: 80 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 3965847
OHFErr: 0 132
RS: 2489139248 3115446
RSCorr: 4163 578
RSUnCorr: 0 0
Bearer 1
OHF: 4113431 0
OHFErr: 0 0
RS: 41133696 0
RSCorr: 0 0
RSUnCorr: 0 0

Retransmit Counters
rtx_tx: 1021365 0
rtx_c: 223 0
rtx_uc: 0 0

G.INP Counters
LEFTRS: 0 0
minEFTR: 73470 0
errFreeBits: 74025983 0

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 744435805 0
Data Cells: 14944419 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: 0 107
SES: 0 0
UAS: 30 30
AS: 66072

Bearer 0
INP: 49.00 0.00
INPRein: 1.00 0.00
delay: 0 0
PER: 0.00 3.98
OR: 0.01 64.22
AgR: 73539.06 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: 8997/8997 297/297

Total time = 18 hours 21 min 42 sec
FEC: 4163 578
CRC: 0 132
ES: 0 107
SES: 0 0
UAS: 30 30
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 15 minutes time = 6 min 42 sec
FEC: 28 0
CRC: 0 1
ES: 0 1
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 136 3
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 = 18 hours 21 min 42 sec
FEC: 4163 578
CRC: 0 132
ES: 0 107
SES: 0 0
UAS: 30 30
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 = 18 hours 21 min 11 sec
FEC: 4163 578
CRC: 0 132
ES: 0 107
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
#


xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 23673 Kbps, Downstream rate = 73192 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 73464 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Discovery Phase (Initial) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3970)
Medley Phase (Final) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3970)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 23673 kbps 73192 kbps
Actual Aggregate Tx Power: 6.7 dBm 14.0 dBm
====================================================================================
VDSL Band Status U0 U1 U2 U3 U4 D1 D2 D3
Line Attenuation(dB): 3.9 19.4 29.4 N/A N/A 10.2 23.9 37.5
Signal Attenuation(dB): 3.9 18.4 28.7 N/A N/A 12.0 23.7 37.4
SNR Margin(dB): 15.2 15.0 15.1 N/A N/A 3.3 3.3 3.3
TX Power(dBm): -6.7 -25.0 6.5 N/A N/A 11.4 7.7 7.1
#


Stats recorded 11 Sep 2017 11:11:06

DSLAM/MSAN type: BDCM:0xa48c / v0xa48c
Modem/router firmware: AnnexA version - A2pv6C038m.d24j
DSL mode: VDSL2 Profile 17a
Status: Showtime
Uptime: 18 hours 22 min 11 sec
Resyncs: 0 (since 11 Sep 2017 11:03:50)

Downstream Upstream
Line attenuation (dB): 15.3 0.0
Signal attenuation (dB): Not available on VDSL2
Connection speed (kbps): 73464 19999
SNR margin (dB): 3.3 15.0
Power (dBm): 14.0 6.7
Interleave depth: 8 1
INP: 49.00 0
G.INP: Enabled Not enabled
Vectoring status: 5 (VECT_UNCONFIGURED)

RSCorr/RS (%): 0.0002 0.0154
RSUnCorr/RS (%): 0.0000 0.0000
ES/hour: 0 15.0


Scratching my head big time at this !