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[adslmax]

Are I getting high retx now on my line?

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

[iwish]

you need the stats from Bearer 0 not one

[adslmax]

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:            78468.97        20063.54

[johnson]

For me I set 48000 10000 100000
I usually sync about 45-46Mb but the 48Mb cap ensures I won't sync any higher if the DSLAM reboots and I reconnect before crosstalkers.

So the settings passed to "xdslctl configure" persist even after a resync? So all that need to be done to make any settings like maxDataRate or snr for those that use it persistent across reboots is to have the xdslctl configure command issued at some point during the boot?

[kitz]

I'm interested in the changes in figures from before the cap and during the cap.

I've been thinking about this.  Previously they denied using FEC.  I tried asking about LEFTRS but it was completely glossed over.
The most obvious is probably LEFTRS or rtx_uc yet you have seen no difference in either of those.. nor Err/Secs

I'm still not totally dismissing FEC, but what about the SNRMargin...  eg:   
if (Profile == 3dB) && (SNRM > 5dB) && (Errors < 'x') then reduce retx

I just made up 5dB.  Errors could be LEFTRS/ErrSecs as usual

If it is SNRM, it could explain why capping works not just for retx, but was also able to remove Interleaving.   Openreach doesn't expect people to be able to tweak the Target SNRM anymore... but when we cap we are artificially increasing the SNRM.

[bkehoe]

So in the early hours of this morning, approx just 36 hours after imposing my cap DLM intervention caused a resync which removed Re Tx High and I'm now back on low. It also appears to have moved me from a 4dB target to a 3dB target SNR finally.
Stats after resync.

===================================================================================
       VDSL Port Details       Upstream         Downstream
               Line Rate:     20.063 Mbps       64.998 Mbps
    Actual Net Data Rate:     19.999 Mbps       64.999 Mbps
          Trellis Coding:         ON                ON
              SNR Margin:        7.1 dB            6.6 dB
            Actual Delay:          0 ms              0 ms
          Transmit Power:      - 2.1 dBm          13.2 dBm
           Receive Power:      -17.1 dBm           1.2 dBm
              Actual INP:        0.0 symbols      46.0 symbols
       Total Attenuation:        0.0 dB          12.0 dB
Attainable Net Data Rate:     22.653 Mbps       78.462 Mbps

After removing cap;

        VDSL Port Details       Upstream         Downstream
               Line Rate:     20.063 Mbps       76.736 Mbps
    Actual Net Data Rate:     19.999 Mbps       76.737 Mbps
          Trellis Coding:         ON                ON
              SNR Margin:        7.2 dB            3.4 dB
            Actual Delay:          0 ms              0 ms
          Transmit Power:      - 2.1 dBm          13.2 dBm
           Receive Power:      -17.1 dBm           1.1 dBm
              Actual INP:        0.0 symbols      47.0 symbols
       Total Attenuation:        0.0 dB          12.1 dB
Attainable Net Data Rate:     22.641 Mbps       77.313 Mbps

Note I do have an occasional source of interference that reduces my SNR by approx 1dB and sometimes lasts for a day, sometimes for a few weeks so I'm not sure if this is the reason that my attainable (and thus new actual sync speed) is lower than 80MBit or if the reason is because of ReTx low and no INP REIN being switched on. I used to use MDWS but since its demise I've sadly lacked closer scrutiny of my connection.

[bkehoe]

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:            78468.97        20063.54

ReTx LOW

[adslmax]

I wish my line get ReTx HIGH and change to ReTx LOW with SNR 3dB to get my line back to 79999K on it own by DLM but maybe I should wait longer.

[johnson]

Sorry for this second OT post, but I was playing with "xdslctl configure" options last night with a view to placing one in the start up of a zyxel modem.

"xdslctl configure --maxDataRate" clears a lot of other options from the configuration of the modem when issued. To the extent that VDSL as a modulation type becomes disabled, obviously this cant really be the case as the way it has been used by people in this thread would not work. It also clears phyre, but I guess this in an ADSL thing, but also bitswap, sra and trellis.. at least as reported after the command.

So the VDSL lines people have tried this on behave exactly as before after creating the cap? Makes me think very little of the modems chosen settings have any effect at all.

[j0hn]

bitswap always continues to work as normal.
never had a problem setting maxdatarate it's a command I've played with for a few years.

I dont use "xdslctl configure --maxDataRate" but rather "adsl configure --maxDataRate" but i would expect identical results from both.

It survives all resyncs wether DSLAM rebooting, DLM initiated or user initiated. It only clears after a reboot of the modem.

[underzone]

I have now settled on capping my line at 74000 to keep FEC errors nice and low - just 20,000 in the last 24hrs. My BRAS IP profile is now 73.7Mbps.

It does seem daft that BT lower your SNR margin to 3dB to increase line speed, however they then add INPREIN=1 which reduces your IP profile and data throughput massively.

[adslmax]

As long don't let openreach see this thread post otherwise openreach could adjusted DLM to stop people's mess around with cap the line and trying to get low rxt

[kitz]

I don't think they'd care so much about us using this method.   What they did not like is people adjusting their Target SNR margin to say 2/3db and then some numpties complaining because their line became unstable at such low rates.   BT made specific mention of people playing with Target SNRM to have an adverse effect on the line.   

This method is in effect increasing the Target SNRm (rather than reducing) to give DLM a nudge.    DLM is now clever enough to know that if the line is unstable to take back what it giveth.

The old method was permanently able to over-ride DLM parameters.  This method just gives the DLM a tap on the shoulder to say "hey I think this line is ok and stable enough to have a better profile...  but you still have full control over it." 

[kitz]

It does seem daft that BT lower your SNR margin to 3dB to increase line speed, however they then add INPREIN=1 which reduces your IP profile and data throughput massively.

It does rather 

[NewtronStar]

The capping method worked as Archetytype486 suggested RTX is now low after 2 days with cap in place, INP: has been stuck at 52.00 and also interleaving Depth of 4 for 5 months.
INP: now at 45.00 and interleaved depth 16.

Before capping the sync to 26000 Kbps the FECS per day were 3-4 million, Errored seconds 4 - 7 SNRM 4.8dB, after capping the SNRM rose to 12dB FECS went down to 5000 per day and just 1 errored second in 2 days.

Code: [Select]

adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    0
Last initialization procedure status:   0
Max:    Upstream rate = 6469 Kbps, Downstream rate = 44903 Kbps
Bearer: 0, Upstream rate = 6469 Kbps, Downstream rate = 40000 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):        4.7             6.0
Attn(dB):        25.0            0.0
Pwr(dBm):        11.2            0.3

                        VDSL2 framing
                        Bearer 0
MSGc:           -6              26
B:              138             191
M:              1               1
T:              0               41
R:              8               10
S:              0.1101          0.9423
L:              10684           1715
D:              16              1
I:              147             101
N:              147             202
Q:              16              0
V:              12              0
RxQueue:                27              0
TxQueue:                9               0
G.INP Framing:          18              0
G.INP lookback:         9               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               729254
OHFErr:         2               0
RS:             862036672               2327746
RSCorr:         115685          5
RSUnCorr:       0               0
                        Bearer 1
OHF:            1482645         0
OHFErr:         0               0
RS:             8895502         0
RSCorr:         16              0
RSUnCorr:       0               0

                        Retransmit Counters
rtx_tx:         28220423                0
rtx_c:          937             0
rtx_uc:         5               0

                        G.INP Counters
LEFTRS:         25              0
minEFTR:        39989           0
errFreeBits:    14526711                0

                        Bearer 0
HEC:            0               0
OCD:            0               0
LCD:            0               0
Total Cells:    1831866277              0
Data Cells:     12971644                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:             2               0
SES:            0               0
UAS:            19              19
AS:             23819

                        Bearer 0
INP:            45.00           0.00
INPRein:        0.00            0.00
delay:          0               0
PER:            0.00            9.69
OR:             0.01            26.40
AgR:            40252.99        6495.02

                        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:        6760/6760               5/5

Total time = 6 hours 37 min 18 sec
FEC:            115685          5
CRC:            2               0
ES:             2               0
SES:            0               0
UAS:            19              19
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 15 minutes time = 7 min 18 sec
FEC:            5092            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:            6086            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 = 6 hours 37 min 18 sec
FEC:            115685          5
CRC:            2               0
ES:             2               0
SES:            0               0
UAS:            19              19
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 = 6 hours 36 min 59 sec
FEC:            115685          5
CRC:            2               0
ES:             2               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
 >
Thanks Kitizens