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Author Topic: How bad is my line?  (Read 2938 times)

hushcoden

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How bad is my line?
« on: January 16, 2019, 04:29:58 PM »

Hi folks,

Sky has upgraded my line from 40/10 to 80/20 (and without any surcharge), and after about 27 hours I can see it's not performing at the best (I know there is crosstalk, etc.).

I am still running a Vigor 2760 and I was thinking after 7-10 days to try my VMG1312-B10A and see if the speed would improve: do you think it's worth the trouble ?

Tia.
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j0hn

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Re: How bad is my line?
« Reply #1 on: January 16, 2019, 04:55:55 PM »

ECI cabinet I assume?
In what way is it not performing as you would like?

The gap between attainable and sync is expected as the line is interleaved.

You could lower the target SNRM with the DrayTek to get a higher sync.
The Zyxel will likely sync a Mb or 2  higher at the default 6dB but you can't lower this.
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hushcoden

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Re: How bad is my line?
« Reply #2 on: January 16, 2019, 05:07:23 PM »

Yes, ECI cabinet. Well, I was hoping to get something in the range of 70Mb+...

And from what you're saying, I could hope to get a speed increase only if the line will move from interleave to fast, right?
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j0hn

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Re: How bad is my line?
« Reply #3 on: January 16, 2019, 05:56:09 PM »

You would get roughly 73Mb on fastpath.

You could get another 5-10Mb while still interleaved by setting a lower target SNRM on the Draytek.
That would likely increase errors so would probably prevent the line going to Fastpath.

You could also increase the SNRM target for a few days which would lower your sync, but it usually nudges DLM to move the line to fastpath.
At that point you change the SNRM back and get the roughly 73Mb i mentioned above.
You could then try lowering the SNRM target and could even get a full 80Mb. You won't be able to tell if the line would hold fastpath at those speeds until you try it.
« Last Edit: January 16, 2019, 05:58:27 PM by j0hn »
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hushcoden

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Re: How bad is my line?
« Reply #4 on: January 16, 2019, 06:00:55 PM »

Okey dokey, many thanks.
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hushcoden

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Re: How bad is my line?
« Reply #5 on: February 19, 2019, 06:34:58 PM »

So, this is my line situation after a week ago I decided to swap a Vigor 2760 for a VMG8924-B10A.

I've attached the Draytek stats just before I disconnected it and here the stats from the ZyXEL:

Code: [Select]
xdslctl info --webstats

====================================================================================
    VDSL Training Status:   Showtime
                    Mode:   VDSL2 Annex B
            VDSL Profile:   Profile 17a
                G.Vector:   Disable
            Traffic Type:   PTM Mode
             Link Uptime:   7 days: 2 hours: 28 minutes
====================================================================================
       VDSL Port Details       Upstream         Downstream
               Line Rate:     19.027 Mbps       68.424 Mbps
    Actual Net Data Rate:     19.003 Mbps       68.301 Mbps
          Trellis Coding:         ON                ON
              SNR Margin:        6.3 dB            6.0 dB
            Actual Delay:          0 ms              8 ms
          Transmit Power:        2.4 dBm           2.5 dBm
           Receive Power:       -4.4 dBm           0.8 dBm
              Actual INP:        0.0 symbols       3.0 symbols
       Total Attenuation:        0.0 dB          15.0 dB
Attainable Net Data Rate:     19.499 Mbps       81.403 Mbps
====================================================================================
  VDSL Band Status        U0      U1      U2      U3      U4      D1      D2      D3
  Line Attenuation(dB):  0.2     23.5    23.8     N/A     N/A    10.0    19.9    33.4
Signal Attenuation(dB):  0.1     22.9    23.7     N/A     N/A    10.3    19.9    33.4
        SNR Margin(dB):  6.0     6.5     6.3      N/A     N/A    6.3     5.9     5.9
         TX Power(dBm): -4.4    -38.4    1.4      N/A     N/A    9.1     7.5     7.4
====================================================================================

            VDSL Counters

           Downstream        Upstream
Since Link time = 28 min 37 sec
FEC:            35067429                3762
CRC:            10891           574
ES:             2353            548
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 15 minutes time = 3 min 4 sec
FEC:            23377           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:            34826           16
CRC:            15              1
ES:             4               1
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 1 day time = 2 hours 33 min 4 sec
FEC:            975966          121
CRC:            215             18
ES:             47              18
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 1 day time = 24 hours 0 sec
FEC:            4163803         569
CRC:            1867            97
ES:             391             93
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Total time = 1 days 2 hours 33 min 4 sec
FEC:            35067429                3762
CRC:            10891           574
ES:             2353            548
SES:            0               0
UAS:            265             265
LOS:            0               0
LOF:            0               0
LOM:            0               0
====================================================================================

It seems connection has slightly improved, is that right?
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tubaman

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Re: How bad is my line?
« Reply #6 on: February 20, 2019, 06:23:25 PM »

I'd be very happy with a line that good - mine runs at approx 45/7, and that's with G.INP and 3dB on a Huawei cabinet.
 :)
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hushcoden

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Re: How bad is my line?
« Reply #7 on: February 21, 2019, 09:08:52 AM »

Oh yes, of course I can't complain  :cool: But I was thinking if I would cap the line I might be lucky and get the interleave removed  :fingers:

Do you think it's feasible ?

Is this the right command:
Code: [Select]
xdslctl configure --maxDataRate 40000 10000 100000
And to remove the cap, do I just reboot the rooter or I have to issue another command ?
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j0hn

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Re: How bad is my line?
« Reply #8 on: February 21, 2019, 09:16:33 AM »

Not with those ES figures, no.

2353 ES in 26 hours is over 100 times more than what DLM will be looking for to remove interleaving.

You have 391 ES in 24 hours so that's just under 2000 ES in a 2 hour period.
Was DslStats running?

If you can get the line to keep at 390'ish over 24 hours then a cap (maybe in the 40-45Mb region) may remove interleaving.
If you continue to have the huge burst of ES then there's no chance of interleaving being removed.

edit: those timers are baffling me.

Quote
       Link Uptime:   7 days: 2 hours: 28 minutes

Quote
Since Link time = 28 min 37 sec

Quote
Total time = 1 days 2 hours 33 min 4 sec
« Last Edit: February 21, 2019, 09:19:02 AM by j0hn »
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hushcoden

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Re: How bad is my line?
« Reply #9 on: February 21, 2019, 09:26:31 AM »

Ahh I suspected so, never mind then... Not running dslstats as my knowledge of Raspberry PI is close to 0  :blush:

Do you think that the stats the modem gave me are not so realistic ?
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j0hn

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Re: How bad is my line?
« Reply #10 on: February 21, 2019, 09:33:58 AM »

Can you post a recent output of "adsl info --stats"
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hushcoden

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Re: How bad is my line?
« Reply #11 on: February 21, 2019, 09:50:22 AM »

Ah I was using a different command...

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 = 19578 Kbps, Downstream rate = 81438 Kbps
Bearer: 0, Upstream rate = 19003 Kbps, Downstream rate = 68301 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):        6.0             6.4
Attn(dB):        15.0            0.0
Pwr(dBm):        2.5             2.4

                        VDSL2 framing
                        Bearer 0
MSGc:           18              13
B:              51              238
M:              1               1
T:              64              63
R:              12              16
S:              0.0242          0.4004
L:              21136           5095
D:              1337            1
I:              64              255
N:              64              255

                        Counters
                        Bearer 0
OHF:            484812776               2630042
OHFErr:         12748           676
RS:             3852823552              2575634
RSCorr:         47186599                4452
RSUnCorr:       324803          0

                        Bearer 0
HEC:            66585           0
OCD:            0               0
LCD:            0               0
Total Cells:    326329611               0
Data Cells:     2096975904              0
Drop Cells:     0
Bit Errors:     0               0

ES:             2774            646
SES:            0               0
UAS:            265             265
AS:             754780

                        Bearer 0
INP:            3.00            0.00
INPRein:        0.00            0.00
delay:          8               0
PER:            1.55            6.33
OR:             123.36          24.00
AgR:            68424.71        19026.93

Bitswap:        194174/194790           400/405

Total time = 8 days 17 hours 44 min 5 sec
FEC:            47186599                4452
CRC:            12748           676
ES:             2774            646
SES:            0               0
UAS:            265             265
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 15 minutes time = 14 min 5 sec
FEC:            48266           11
CRC:            1               2
ES:             1               2
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 15 minutes time = 15 min 0 sec
FEC:            43030           6
CRC:            5               1
ES:             1               1
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 1 day time = 17 hours 44 min 5 sec
FEC:            5817498         266
CRC:            606             41
ES:             143             38
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 1 day time = 24 hours 0 sec
FEC:            7277638         545
CRC:            1466            79
ES:             325             78
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Since Link time = 8 days 17 hours 39 min 39 sec
FEC:            47186599                4452
CRC:            12748           676
ES:             2774            646
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
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j0hn

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Re: How bad is my line?
« Reply #12 on: February 21, 2019, 09:57:25 AM »

Much better stats and the timers seem to match.

No need to cap the upstream. Upstream ES are counted independent of the downstream ES.

xdslctl configure --maxDataRate 50000 20000 100000

You could cap lower to ensure interleaving is removed but 50Mb should be sufficient.
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hushcoden

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Re: How bad is my line?
« Reply #13 on: February 21, 2019, 10:10:17 AM »

Many thanks and a reboot of the rooter will suffice to remove the cap, am I right ?

Lastly, for the lucky ones connected to an ECI cab, is there a way to get the SNR down to 3dB ?
« Last Edit: February 21, 2019, 10:13:04 AM by hushcoden »
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j0hn

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Re: How bad is my line?
« Reply #14 on: February 21, 2019, 10:48:30 AM »

A reboot of the modem will remove the cap yes.
You can also remove the cap by sending the command

xdslctl configure --maxDataRate 80000 20000 100000

Quote
Lastly, for the lucky ones connected to an ECI cab, is there a way to get the SNR down to 3dB ?

Only with the DrayTek device I'm afraid.
Broadcom chipsets won't do this, only Lantiq.
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