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Standard User WelshWArrior
(fountain of knowledge) Sun 26-Mar-17 19:48:27
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Lower SNR extended to my cab?


[link to this post]
 
I had been happily sync'd for about 12 days until shortly before 12pm today when there was a resync. I had a warning email about the resync so checked my stats. Seems I'm now connected at 66Mbps (3 more than usual) and SNR down is 5.3.

Does this mean that my cab is now using the new SNR profiles? I am tenbyboy2 on MDWS. My current stats:

adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 17188 Kbps, Downstream rate = 66214 Kbps
Bearer: 0, Upstream rate = 17188 Kbps, Downstream rate = 66249 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): 5.3 6.0
Attn(dB): 18.9 0.0
Pwr(dBm): 12.6 7.5

VDSL2 framing
Bearer 0
MSGc: -6 21
B: 243 237
M: 1 1
T: 0 64
R: 10 16
S: 0.1173 0.4406
L: 17326 4612
D: 8 1
I: 254 127
N: 254 254
Q: 8 0
V: 0 0
RxQueue: 72 0
TxQueue: 18 0
G.INP Framing: 18 0
G.INP lookback: 18 0
RRC bits: 0 24

-------------------------------------------
BT Infinity 2 Unlimited
http://www.thinkbroadband.com/speedtest/button/14676...
Standard User j0hn83
(member) Sun 26-Mar-17 20:26:15
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Re: Lower SNR extended to my cab?


[re: WelshWArrior] [link to this post]
 
It appears to be yes. It matches the criteria expected.

1st is that only the downstream is affected. Upstream will show the usual slight variation but should remain roughly the same.
2nd is that the line doesn't jump straight to 3dB. Every example I've seen show the line should drop in 1dB stages.
3rd is that the max attainable rises with the drop in target SNRM.

With a lower SNRM caused by a DSLAM reboot it usually affects both downstream/upstream. The max attainable usually drops back down after all your crosstalkers reconnect. It also doesn't go 1dB intervals.

You appear to be on a 5dB target. If DLM thinks the line is coping then in the next couple days it should drop to 4dB. Could you post back if it does indeed drop to 4dB?
Standard User WelshWArrior
(fountain of knowledge) Sun 26-Mar-17 20:32:32
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Re: Lower SNR extended to my cab?


[re: j0hn83] [link to this post]
 
Thanks for the reply - I was hoping that was the case. I've had a couple of disconnects over the past few months that I though was the trial but as you said - the upstream and downstream were affected but speed dropped back down within a few hrs.

I'll keep an eye in it over the next couple of days and yes I sure will post back if it drops to 4db.

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Standard User WilliamGrimsley
(committed) Sun 26-Mar-17 21:19:59
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Re: Lower SNR extended to my cab?


[re: WelshWArrior] [link to this post]
 
Thanks! Please could you post the errors part of the adsl info --stats result, too? This will help us determine if your line is stable.
Standard User WelshWArrior
(fountain of knowledge) Sun 26-Mar-17 23:39:57
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Re: Lower SNR extended to my cab?


[re: WilliamGrimsley] [link to this post]
 
Here we go this is obviously just since the resync:

Since Link time = 11 hours 23 min 21 sec
FEC: 127272 35
CRC: 0 2
ES: 0 2
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0

-------------------------------------------
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Standard User TygerTyger2010
(learned) Mon 27-Mar-17 01:09:51
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Re: Lower SNR extended to my cab?


[re: WelshWArrior] [link to this post]
 
Over the last few days mine has went from:

DSLAM/MSAN type: BDCM
Modem/router firmware: Not reported
DSL mode: G.993.2 (VDSL2)
Status: Showtime
Uptime: 3 days, 4:19:55
Resyncs: 0 (since 02 Nov 2016 13:06:38)

Downstream Upstream
Line attenuation (dB): 14.8 5.9
Signal attenuation (dB): Not monitored
Connection speed (kbps): 35413 7139
SNR margin (dB): 6.2 6.2
Power (dBm): 13.9 7.2
Interleave depth: 8 0
INP: 49.00 0
G.INP: Enabled

RSCorr/RS (%):
RSUnCorr/RS (%):
ES/hour:

To:

Stats recorded 26 Mar 2017 09:28:56

DSLAM/MSAN type: BDCM
Modem/router firmware: Not reported
DSL mode: G.993.2 (VDSL2)
Status: Showtime
Uptime: 0 days, 23:34:49
Resyncs: 0 (since 22 Feb 2017 15:54:24)

Downstream Upstream
Line attenuation (dB): 14.9 6.0
Signal attenuation (dB): Not monitored
Connection speed (kbps): 39999 7622
SNR margin (dB): 4.6 6.0
Power (dBm): 14.0 7.5
Interleave depth: 4 0
INP: 52.00 0
G.INP: Enabled

RSCorr/RS (%):
RSUnCorr/RS (%):
ES/hour:

At one point it was at 5dB downstream and a D/S Sync of about 38.8Mb.

ZeN Unlimited Fibre 1
Standard User WelshWArrior
(fountain of knowledge) Mon 27-Mar-17 08:01:03
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Re: Lower SNR extended to my cab?


[re: TygerTyger2010] [link to this post]
 
Nice!! Mine's still at 5.3 this morning but it's less than 24hrs since the resync so hopefully, as long as it stays stable enough, I'll see a further drop later this week smile

-------------------------------------------
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Standard User WWWombat
(knowledge is power) Mon 27-Mar-17 11:07:16
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Re: Lower SNR extended to my cab?


[re: j0hn83] [link to this post]
 
In reply to a post by j0hn83:
It appears to be yes. It matches the criteria expected.


Agreed.

Looking at MDWS, the line seems to be getting the same FEC and retransmission rates as before, and no CRC or ES.

Currently looking good to go for the next step.
Standard User WelshWArrior
(fountain of knowledge) Mon 27-Mar-17 11:22:43
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Re: Lower SNR extended to my cab?


[re: WWWombat] [link to this post]
 
That's good news! Fingers crossed then I see a further drop in SNR some time this week smile

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Standard User WilliamGrimsley
(committed) Mon 27-Mar-17 11:37:46
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Re: Lower SNR extended to my cab?


[re: WWWombat] [link to this post]
 
Yes, not like mine! 28454402 downstream FEC's/hour in 23 hours, 5 minutes and 50 seconds on a downstream SNR margin of 3 dB!
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