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[ejs]

But the drop in SNRM indicates it's now worse than it was before.

[hucknallred]

But the drop in SNRM indicates it's now worse than it was before.

OK, I suspect I have to live with this due to the sheer length of my line to the cab, would have preferred more than a 25% increase for switching to FTTC.

I do want to categorically rule out my wiring including my DIY cable to the router, so I'm going to rejig things, I've ordered proper 3m cables for the router & phone so I can locate them in the living room plugged direct into the master socket & remove all extension wiring.

So, my question is, can the VDSL connection be gracefully shut down without any more DLM malarkey kicking in? Should I select disconnect from the router then power down? Just power off the router?
From doing this I should know what I can expect going forward. For the record these are my stats from the BTW DSL checker, I presume I'm in the expected range so no engineer checks



                                        High   Low     High Low            
VDSL Range A (Clean)   36.5   27.4      7.6  5.7   
VDSL Range B (Impacted)   28   15      6.9  2.7   


WBC ADSL 2+   Up to 15.5   --    8.5 to 18.5 << ADSL was always higher than 18.5.

[Dray]

If you disconnect or power down the DSL connection, remember to leave 30 minutes before you reconnect it. This will stop DLM counting a disconnection

[hucknallred]

But the drop in SNRM indicates it's now worse than it was before.

Thanks for pointing out my lack of knowledge 
I have now discarded my dodgy internal wiring for proper manufactured cables. The downstream SNRM has now gone up to 8.4/8.6dB max attainable is now around 35700, still stuck at the banded 24999 though, fingers crossed DLM ups this now 

[hucknallred]

still stuck at the banded 24999 though, fingers crossed DLM ups this now 

Success! Had a resync at 12:04, now at 29999 down  SNRM has dropped & is hovering at +/- 6dB.
Didn't expect anything to happen that quick, anything else speedwise will be a bonus now.

Hopefully the errors are manageable & it won't drop again.

new stats below

 > adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    1
Last initialization procedure status:   0
Max:    Upstream rate = 7248 Kbps, Downstream rate = 35465 Kbps
Bearer: 0, Upstream rate = 7175 Kbps, Downstream rate = 29999 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):        6.1             6.2
Attn(dB):        25.8            0.0
Pwr(dBm):        6.4             6.3

                        VDSL2 framing
                        Bearer 0
MSGc:           24              33
B:              34              224
M:              1               1
T:              60              5
R:              8               16
S:              0.0371          0.9969
L:              9272            1934
D:              880             1
I:              43              241
N:              43              241

                        Counters
                        Bearer 0
OHF:            5527828         108400
OHFErr:         338             74
RS:             1989911654              1340810
RSCorr:         1168078         199
RSUnCorr:       57984           0

                        Bearer 0
HEC:            11457           0
OCD:            26              0
LCD:            26              0
Total Cells:    1068983193              0
Data Cells:     288786833               0
Drop Cells:     511
Bit Errors:     0               0

ES:             78              649
SES:            11              0
UAS:            33              22
AS:             18534

                        Bearer 0
INP:            3.00            0.00
INPRein:        0.00            0.00
delay:          8               0
PER:            3.35            16.26
OR:             71.59           19.18
AgR:            30070.44        7194.30

Bitswap:        1044/1045               8/8

Total time = 1 days 22 hours 16 min 7 sec
FEC:            164618529               2005
CRC:            3073            743
ES:             78              649
SES:            11              0
UAS:            33              22
LOS:            1               0
LOF:            8               0
LOM:            0               0
Latest 15 minutes time = 1 min 7 sec
FEC:            1795            1
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:            49857           13
CRC:            2               3
ES:             1               3
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 1 day time = 22 hours 16 min 7 sec
FEC:            163975675               982
CRC:            2929            330
ES:             49              287
SES:            11              0
UAS:            33              22
LOS:            1               0
LOF:            8               0
LOM:            0               0
Previous 1 day time = 24 hours 0 sec
FEC:            642854          1023
CRC:            144             413
ES:             29              362
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Since Link time = 5 hours 8 min 53 sec
FEC:            1168078         199
CRC:            338             74
ES:             29              59
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
 

[WWWombat]

It looks like it both altered the banding to 30Mbps, and reduced the FEC+interleaving to a lower level (INP is now 3 instead of 3.5; delay still 8ms; FEC overhead now 8/43 instead of 10/42).

With the increase in speed, it looks like the ES rate has increased a little. That'll be the thing to watch now.

[ejs]

Probably the INP_min is the same at 3, but with the lower banding, there was a lot of spare bandwidth which could be used to carry FEC data, which was used to produce an actual INP value above the minimum required. The DLM has changed the banding, but the error protection has remained the same on the "Interleaving Low" profile.

[WWWombat]

That makes sense - I can buy that.

[hucknallred]

Thanks for taking the time to look at my stats. I have since moved the router away from the electric socket & DECT base station - very carefully without powering off, & got bout an extra 0.5dB on the SNRM. I had no idea VDSL was so sensitive to interference.
Hopefully this may eek out a little more speed, we shall see.
I think I have successfully set up MDWS - user Gedpie if anyone cares to take a look.

[burakkucat]

I think I have successfully set up MDWS - user Gedpie if anyone cares to take a look.

I can see eight users whose names begin with "G" or "g" but no "Gedpie". 

[konrado5]

hucknailred: could you also attach your Hlog?

[hucknallred]

I can see eight users whose names begin with "G" or "g" but no "Gedpie". 

I did say "I think". Registration was succesful, but I need to revisit MDWS another time...

[hucknallred]

hucknailred: could you also attach your Hlog?

That I can manage...

[burakkucat]

That I can manage...

Unfortunately it is truncated. A Profile 17a, G.993.2 (a.k.a. VDSL2) circuit has a total of 4096 sub-carriers (numbered from 0 to 4095). So you will need to adjust the X-axis scale with the controls at the bottom of the relevant screen.

[hucknallred]

Unfortunately it is truncated. A Profile 17a, G.993.2 (a.k.a. VDSL2) circuit has a total of 4096 sub-carriers (numbered from 0 to 4095). So you will need to adjust the X-axis scale with the controls at the bottom of the relevant screen.

Sorted, it was set for ADSL.
Have also ticked the box to get MDSW uploading too