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Author Topic: 3db Target SNRM  (Read 353 times)

Shakermaker

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3db Target SNRM
« on: November 10, 2019, 03:04:24 PM »

Hi Guys,

Just gone back to FTTC after going back to ADSL earlier in the year and I'm now on a Huawei cab compared to being on an ECI last time and was just wondering if all connections get the 3db snr margin as over the past couple of days I've had G.IMP applied on both down & up but had no action last night and wondering if DLM is going to leave me on a 6db target?

Current stats attached,

Thanks,


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underzone

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Re: 3db Target SNRM
« Reply #1 on: November 10, 2019, 03:43:39 PM »

I have noticed it takes 2 days to get g.inp after a DLM reset/service provide.
Then another 2 days to get a 5dB profile.
Then another 2 days to get a 4dB profile.
Then another 2 days to get a 3dB profile, assuming your line remains stable.
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AAISP Home::1 80/20, Huawei 288, Zyxel VMG8924-B10A (bridged with 1500 MTU, thanks to johnson), pfSense x64

tubaman

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Re: 3db Target SNRM
« Reply #2 on: November 10, 2019, 04:31:26 PM »

As @underzone has said the decrease will be in 1dB steps. I'm not sure if it takes two days for this to start but I certainly agree that once the reduction has began there is a two day wait between each step.
There is nothing you can do to influence the process so it's just a case of being patient.
 :)
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BT FTTC 80/20 Huawei Cab - Zyxel VMG8924-B10A

Shakermaker

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Re: 3db Target SNRM
« Reply #3 on: November 10, 2019, 05:55:29 PM »

No worries thanks for the info  :)
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underzone

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Re: 3db Target SNRM
« Reply #4 on: November 10, 2019, 06:13:32 PM »

Fingers crossed that at 3am tonight DLM sorts you out!  ;D
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AAISP Home::1 80/20, Huawei 288, Zyxel VMG8924-B10A (bridged with 1500 MTU, thanks to johnson), pfSense x64

j0hn

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Re: 3db Target SNRM
« Reply #5 on: November 10, 2019, 11:59:10 PM »

The short answer is no, all connections don't get below 6dB SNRM targets.
It's only of the line is below certain error thresholds which we know little about.

Some lines stay at 6dB, some only go to 5dB, others to 4dB and many remain stable enough to go to 3dB.
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Plusnet FTTC 80/20 -  ECI now Huawei cab
retx low @ 3dB target SNRM
Zyxel VMG1312-B10A bridged with 1508 MTU + Asus RT-AC68U running Asuswrt-Merlin

adslmax

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Re: 3db Target SNRM
« Reply #6 on: November 11, 2019, 03:17:50 AM »

Mine was the same too

xdslctl info --stats
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    2
Last initialization procedure status:   1
Max:    Upstream rate = 21043 Kbps, Downstream rate = 80132 Kbps
Bearer: 0, Upstream rate = 20000 Kbps, Downstream rate = 79999 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):        3.1             6.1
Attn(dB):        12.0            0.0
Pwr(dBm):        12.5            2.2

DSLAM type / SW version:   BDCM:0xa48c (164.140) / v0xa48c
Modem/router firmware:     AnnexA version - A2pvfbH043q.d26u
DSL mode:                  VDSL2 Profile 17a
Status:                    Showtime
Uptime:                    63 days 3 hours 12 min 31 sec
Resyncs:                   0 (since 11 Nov 2019 03:03:12)
         
            Downstream   Upstream
Line attenuation (dB):     12.0      0.0
Signal attenuation (dB):   Not available on VDSL2      
Connection speed (kbps):   79999      20000
SNR margin (dB):           3.1      6.1
Power (dBm):               12.5      2.2
Interleave depth:          16      8
INP:                       46.00     47.00
G.INP:                     Enabled        Enabled
Vectoring status:          5 (VECT_UNCONFIGURED)      

GEA Test below:

Profile Name    0.128M-80M Downstream 3dB, Retransmission Low - 0.128M-20M Upstream, Error Protection Off
« Last Edit: November 11, 2019, 03:25:41 AM by adslmax »
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Shakermaker

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Re: 3db Target SNRM
« Reply #7 on: November 11, 2019, 07:35:26 AM »

Yes checked it this morning still the same got a bad feeling this the max I will achieve.

ISP has told me 42mbps minimum but I'm working away most of this week so just going to leave it till weekend see what happens.

Sent from my GM1913 using Tapatalk

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