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[adslmax]

Is it true that Openreach FTTC no longer get 96.69% from IP Profile if the sync rate sit at 79999K from Target SNR 3dB as the IP Profile sit at 74.1Mb rather than 77.35Mb with G.INP enabled.

Before:

Max Rate 80021K
Sync Rate 79999K
SNR 5.9dB
G.INP Enabled
Bras IP Profile 77.35Mb (96.69%)

Now:

Max Rate 81069K
Sync Rate 79999K
SNR 3.1dB
G.INP Enabled
Bras IP Profile 74.1Mb (92.64%)
 

[kitz]

Depends if your DLM profile is Re-tx high  - See NGA for VDSL / FTTC  Profiles

Figure is 91-92% for lines which have High Re-tx DLM profiles

I think most/all lines on 3dB have re-tx high.


Whats your INP REIN figure from your line stats?

[j0hn]

From my experience all Broadcom modems use retx high on 3, 4, and 5dB SNRM targets.

I've only ever once seen a line with a 3dB (or 4/5dB) SNRM target with retx low and that was Blacksheep using his
BT HH5A.
Usually we can't see the stats of this modem in detail but he posted his line profile which confirmed it.

https://forum.kitz.co.uk/index.php/topic,20102.msg352352.html#msg352352

This was fairly early on in the XdB rollout so things may have changed but I'm pretty convinced the Broadcoms default to retx high.

[adslmax]

@kitz how do I find out of INP REIN figure in my router stats?

[j0hn]

@kitz how do I find out of INP REIN figure in my router stats?

adsl info --stats

You're looking for

Bearer 0
INPRein = 1

[Black Sheep]

From my experience all Broadcom modems use retx high on 3, 4, and 5dB SNRM targets.

I've only ever once seen a line with a 3dB (or 4/5dB) SNRM target with retx low and that was Blacksheep using his
BT HH5A.
Usually we can't see the stats of this modem in detail but he posted his line profile which confirmed it.

https://forum.kitz.co.uk/index.php/topic,20102.msg352352.html#msg352352

This was fairly early on in the XdB rollout so things may have changed but I'm pretty convinced the Broadcoms default to retx high.

Had another recently on a Hub 6. 

[adslmax]

  How can you access to BT with all these service tools BS?

[j0hn]

He's an OpenReach engineer max ...

Thanks BS! Impossible to tell from the stats of said modem.

It's probably a Broadcom thing.
When MDWS was still up I checked every single user with a sub 6dB SNRM target* and every single 1 had Bearer 0 INPRein 1 which we understand to be retx high.

* it was easy to tell on mdws between snrm's with a lower target and those that had dropped from the 6dB target.

[adslmax]

Ah that's explain cos he work for openreach but I do think that's every customers should have that feature tools via the ISP.

[Black Sheep]

Thanks BS! Impossible to tell from the stats of said modem.

Not a problem, pal. 

[Archetype486]

I am currently on 3db and my line is re-tx low. It was on high after my line was un-banded and this was confirmed by my ISP.

Sync rate is: 68680
BRAS rate is: 66410 (96.74%)

How I got it changed was to manually limit my connection speed, thus reducing errors. The DLM then kicked in after just under a week and removed re-tx high.

Code: [Select]

xdslctl info --stats
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    0
Last initialization procedure status:   0
Max:    Upstream rate = 18741 Kbps, Downstream rate = 68643 Kbps
Bearer: 0, Upstream rate = 18741 Kbps, Downstream rate = 68680 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             6.1
Attn(dB):        18.3            0.0
Pwr(dBm):        13.3            7.4

                        VDSL2 framing
                        Bearer 0
MSGc:           -6              22
B:              243             239
M:              1               1
T:              0               64
R:              10              14
S:              0.0000          0.4075
L:              17962           4987
D:              8               1
I:              254             127
N:              254             254
Q:              8               0
V:              0               0
RxQueue:                56              0
TxQueue:                14              0
G.INP Framing:          18              0
G.INP lookback:         14              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               1477377
OHFErr:         7               718
RS:             1485793448              670977
RSCorr:         10471195                3948
RSUnCorr:       0               0
                        Bearer 1
OHF:            116504466               0
OHFErr:         0               0
RS:             1165044046              0
RSCorr:         203             0
RSUnCorr:       0               0

                        Retransmit Counters
rtx_tx:         3051208         0
rtx_c:          9323            0
rtx_uc:         32              0

                        G.INP Counters
LEFTRS:         67              0
minEFTR:        68681           0
errFreeBits:    1960233053              0

                        Bearer 0
HEC:            0               0
OCD:            0               0
LCD:            0               0
Total Cells:    2350277003              0
Data Cells:     868773811               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:             5               676
SES:            0               0
UAS:            29              29
AS:             1871898

                        Bearer 0
INP:            49.00           0.00
INPRein:        0.00            0.00
delay:          0               0
PER:            0.00            6.54
OR:             0.01            34.22
AgR:            68750.78        18775.16

                        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:        282856/282856           16941/16943

Total time = 21 days 15 hours 58 min 47 sec
FEC:            10471195                3948
CRC:            7               718
ES:             5               676
SES:            0               0
UAS:            29              29
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 15 minutes time = 13 min 47 sec
FEC:            4640            3
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:            5484            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 = 15 hours 58 min 47 sec
FEC:            299507          221
CRC:            0               33
ES:             0               29
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 1 day time = 24 hours 0 sec
FEC:            412877          191
CRC:            0               32
ES:             0               32
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Since Link time = 21 days 15 hours 58 min 17 sec
FEC:            10471195                3948
CRC:            7               718
ES:             5               676
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
 >


[j0hn]

I am currently on 3db and my line is re-tx low. It was on high after my line was un-banded and this was confirmed by my ISP.

Sync rate is: 68680
BRAS rate is: 66410 (96.74%)

How I got it changed was to manually limit my connection speed, thus reducing errors. The DLM then kicked in after just under a week and removed re-tx high.

I can see your stats confirm this with Bearer 0 INPRein 0.
I'm now 110% confident this tells us with certainty if a line is retx low/high.

I just capped my own line from 46Mb to 32Mb in the hope of nudging DLM to retx low.

edit: to cap your line the necessary commands is

xdslcmd configure --maxDataRate 60000 20000 100000
or
adsl configure --maxDataRate 60000 20000 100000

This would cap the line at 60/20. The 3rd figure can be left at 100000. Adjust to suit your own line.

If you are unsure if you need to use adsl or xdslcmd feel free to ask and dungeons will be happy to advise.

Would anyone who is taking advantage of this advice to lower retransmission level and who runs DslStats spend a couple minutes of your time to contribute to the pool of knowledge.

I'm interested in seeing the following figures before capping your line and during the cap.

ES and FEC
and from the G.INP tab
rtx_tx, rtx_uc and LEFTERS

Snapshots/Screenshots of these graphs would be very much appreciated.
We would like to get some idea what parameters DLM is monitoring when deciding on retx high/low.

DslStats does not routinely gather snapshots of G.INP graphs but clicking the camera icon in the bottom left of DslStats while viewing each graph will take a snapshot of that particular graph.

[underzone]

I just capped my own line from 46Mb to 32Mb in the hope of nudging DLM to retx low.

What CLI command did you enter mate?

[kitz]

I can see your stats confirm this with Bearer 0 INPRein 0.
I'm now 110% confident this tells us with certainty if a line is retx low/high.

I think that INP Rein 0 = Off. 
Like you, I'm pretty sure that this is the indicator for re-tx low/high, which is why I asked Max to provide that info from his stats.

I just capped my own line from 46Mb to 32Mb in the hope of nudging DLM to retx low.

Interesting experiment.  Good luck

[Archetype486]

What CLI command did you enter mate?

I used the information in this thread https://forum.kitz.co.uk/index.php/topic,16427.0.html to cap my line.

adsl configure --maxDataRate 30000 15000 100000 is what I used on my Zyxel VMG8924-B10A