Internet stops working when SNR drops below 6dB
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Re: Internet stops working when SNR drops below 6dB
13-01-2014 10:56 PM
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Been reading about interleaving and I understand why it has been applied but I have also read that it can impact on performance, especially with online gaming. I don't game as of now but I had hoped to start playing ARMA again, is this likely to be an issue? Once I have got PlusNet to change my target to 9dB (once they pick up this thread, I assume) is it something I will be able to have turned off or is it required for my line bearing in mind noise (see attached image)?
Currently my ping times are as follows:
ben@reticle:~$ ping -c 15 bbc.co.uk
PING bbc.co.uk (212.58.246.104) 56(84) bytes of data.
64 bytes from fmt-vip133.cwwtf.bbc.co.uk (212.58.246.104): icmp_req=1 ttl=56 time=36.2 ms
64 bytes from fmt-vip133.cwwtf.bbc.co.uk (212.58.246.104): icmp_req=2 ttl=56 time=34.0 ms
64 bytes from fmt-vip133.cwwtf.bbc.co.uk (212.58.246.104): icmp_req=3 ttl=56 time=34.2 ms
64 bytes from fmt-vip133.cwwtf.bbc.co.uk (212.58.246.104): icmp_req=4 ttl=56 time=33.8 ms
64 bytes from fmt-vip133.cwwtf.bbc.co.uk (212.58.246.104): icmp_req=5 ttl=56 time=33.9 ms
64 bytes from fmt-vip133.cwwtf.bbc.co.uk (212.58.246.104): icmp_req=6 ttl=56 time=33.4 ms
64 bytes from fmt-vip133.cwwtf.bbc.co.uk (212.58.246.104): icmp_req=7 ttl=56 time=34.1 ms
64 bytes from fmt-vip133.cwwtf.bbc.co.uk (212.58.246.104): icmp_req=8 ttl=56 time=34.4 ms
64 bytes from fmt-vip133.cwwtf.bbc.co.uk (212.58.246.104): icmp_req=9 ttl=56 time=34.1 ms
64 bytes from fmt-vip133.cwwtf.bbc.co.uk (212.58.246.104): icmp_req=10 ttl=56 time=34.3 ms
64 bytes from fmt-vip133.cwwtf.bbc.co.uk (212.58.246.104): icmp_req=11 ttl=56 time=34.9 ms
64 bytes from fmt-vip133.cwwtf.bbc.co.uk (212.58.246.104): icmp_req=12 ttl=56 time=33.7 ms
64 bytes from fmt-vip133.cwwtf.bbc.co.uk (212.58.246.104): icmp_req=13 ttl=56 time=34.0 ms
64 bytes from fmt-vip133.cwwtf.bbc.co.uk (212.58.246.104): icmp_req=14 ttl=56 time=34.1 ms
64 bytes from fmt-vip133.cwwtf.bbc.co.uk (212.58.246.104): icmp_req=15 ttl=56 time=34.0 ms
--- bbc.co.uk ping statistics ---
15 packets transmitted, 15 received, 0% packet loss, time 14020ms
rtt min/avg/max/mdev = 33.403/34.256/36.224/0.630 ms
As ping has never been an issue before for me all I know is the lower the better. Am I likely to manage twitchy FPS games with these figures?
Thanks everyone for your ongoing assistance, it is appreciated.
Re: Internet stops working when SNR drops below 6dB
14-01-2014 1:20 PM
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Re: Internet stops working when SNR drops below 6dB
14-01-2014 7:23 PM
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Many thanks for your assistance, I am more than happy to sacrifice some speed in return for stability. I have dropped the SNR percentage slider in the router settings back down to 100%. I have also closed my support question.
My router is currently reporting 888 up and 9608 down which is fine by me. Thanks again.
Re: Internet stops working when SNR drops below 6dB
20-01-2014 4:19 AM
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I have set the SNR percentage slider to 120% to compensate but please can somebody rectify the issue and set my line to a target of 9dB as opposed to 6dB.
Thanks in advance.
adslctl info --stats
adslctl: ADSL driver and PHY status
Status: ShowtimeRetrain Reason: 8000
Channel: FAST, Upstream rate = 888 Kbps, Downstream rate = 10400 Kbps
Link Power State: L0
Mode: ADSL2+
Channel: Fast
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 7.4 9.5
Attn(dB): 39.0 23.3
Pwr(dBm): 0.0 12.7
Max(Kbps): 12280 888
Rate (Kbps): 10400 888
G.dmt framing
K: 163(0) 14
R: 12 16
S: 1 8
D: 64 8
ADSL2 framing
MSGc: 59 10
B: 162 13
M: 1 8
T: 2 9
R: 12 16
S: 0.5000 4.0000
L: 2800 256
D: 64 8
Counters
SF: 567357 512167
SFErr(CRCErr): 10 0
RS: 73756540 629075
RSCorr: 4968 0
RSUnCorr: 331 0
HEC: 9 0
OCD: 1 0
LCD: 0 0
Total Cells: 226141873 1649213
Data Cells: 20620643 15989
Drop Cells: 0
Bit Errors: 0 0
ES: 6 0
SES: 0 0
UAS: 35 0
AS(Uptime): 9220
INP: 1.09 2.00
PER: 16.25 18.00
delay: 8.00 8.00
OR: 32.00 7.11
Bitswap: 1112 305
Total uptime: 9220
Total time = 2 hours 34 min 41 sec
SF = 567357
CRC = 10
LOS = 0
LOF = 0
ES = 6
Latest 1 day time = 2 hours 34 min 41 sec
SF = 567357
CRC = 10
LOS = 0
LOF = 0
ES = 6
Latest 15 minutes time = 4 min 41 sec
SF = 17344
CRC = 0
LOS = 0
LOF = 0
ES = 0
Previous 15 minutes time = 15 min 0 sec
SF = 55365
CRC = 4
LOS = 0
LOF = 0
ES = 3
Previous 1 day time = 0 sec
SF = 0
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
SF = 55366
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
SF = 55427
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
SF = 55366
CRC = 0
LOS = 0
LOF = 0
ES = 0
Showtime Drop Reason: 8000
Last Retrain Reason: 8000
#
Re: Internet stops working when SNR drops below 6dB
20-01-2014 7:21 AM
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So if your router can force the change I would live with it and not get it changed from PN side. Or you could get less speed, mine went from 4.5-5mbit to 3.5mbit after going interleaved etc
@PN no not a request for help its stable do NOT touch it.
Re: Internet stops working when SNR drops below 6dB
20-01-2014 7:17 PM
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I am running a DG834GT, there was no option to tweak the SNR with the stock firmware but the DGTeam firmware added the feature. I picked up this router for £20 brand new and I am really glad I did due to the problems I have been having.
When I got in today I found my router is reporting a SNR of 4dB (and dropping) with a sync speed of 12022kbps but I still have the SNR percentage at 120%. Yesterday it was reporting a SNR of 6dB with the same settings; I am unsure whether the router is displaying the correct figures as it seems like a large drop for less than a day, but I am a novice with routers and ADSL. Bizarrely there appears to be no issues today with the internet dropping out so I have to admit I don't have a clue what is going on. There is one LCP down event at 11:50 this morning in the logs. I don't know if PN have changed something or whether my router has lost the plot as anything below 6dB has caused instant problems in the past.
Regarding using the SNR adjustments in my router, do you happen to know if this will add overheads to the router?
I am posting some grabs and stats as I am incredibly puzzled as to why there has been such a large drop in SNR, and also why there is apparently no issues today at the current SNR/sync speeds.
If PlusNet have made any changes would someone from the DCT chime in and let me know? I am confused.
adslctl info --stats
adslctl: ADSL driver and PHY status
Status: ShowtimeRetrain Reason: 8000
Channel: FAST, Upstream rate = 888 Kbps, Downstream rate = 12022 Kbps
Link Power State: L0
Mode: ADSL2+
Channel: Fast
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 3.5 10.2
Attn(dB): 39.0 23.3
Pwr(dBm): 0.0 12.7
Max(Kbps): 13776 888
Rate (Kbps): 12022 888
G.dmt framing
K: 188(0) 14
R: 14 16
S: 1 8
D: 64 8
ADSL2 framing
MSGc: 59 10
B: 187 13
M: 1 8
T: 2 9
R: 14 16
S: 0.4990 4.0000
L: 3238 256
D: 64 8
Counters
SF: 1643026 1480501
SFErr(CRCErr): 566 0
RS: 213593398 879226
RSCorr: 1502258 0
RSUnCorr: 28459 0
HEC: 450 0
OCD: 36 0
LCD: 0 0
Total Cells: 755558619 1114979
Data Cells: 300437 282
Drop Cells: 0
Bit Errors: 0 0
ES: 300 0
SES: 6 0
UAS: 68 0
AS(Uptime): 26650
INP: 1.10 2.00
PER: 16.21 18.00
delay: 7.98 8.00
OR: 32.05 7.11
Bitswap: 2486 431
Total uptime: 62919
Total time = 17 hours 30 min 27 sec
SF = 3874870
CRC = 1147
LOS = 1
LOF = 9
ES = 300
Latest 1 day time = 17 hours 30 min 27 sec
SF = 3874870
CRC = 1147
LOS = 1
LOF = 9
ES = 300
Latest 15 minutes time = 27 sec
SF = 1670
CRC = 0
LOS = 0
LOF = 0
ES = 0
Previous 15 minutes time = 15 min 0 sec
SF = 55468
CRC = 8
LOS = 0
LOF = 0
ES = 6
Previous 1 day time = 0 sec
SF = 0
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
SF = 55531
CRC = 11
LOS = 0
LOF = 0
ES = 4
15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
SF = 55468
CRC = 22
LOS = 0
LOF = 0
ES = 15
15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
SF = 55468
CRC = 14
LOS = 0
LOF = 0
ES = 8
Showtime Drop Reason: 8000
Last Retrain Reason: 8000
#
Re: Internet stops working when SNR drops below 6dB
20-01-2014 8:08 PM
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Try the QLT at different times of day / night. A line might be fine during the day but very noisy during the night / wet or stormy weather.
In another browser tab, login into the Plusnet user portal BEFORE clicking the fault & ticket links
Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.
If this post helped, please click the Thumbs Up and if it fixed your issue, please click the This fixed my problem green button below.
Re: Internet stops working when SNR drops below 6dB
22-01-2014 1:14 AM
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I ran a few test when I had the previous problem at different times and the line sounded clear, but I will run a few more and see if anything has changed. When you say voice service provider would that be the company that supplies my phone service (Plus Net)?
Yesterday, with the SNR percentage at 120%, the line was apparently running at 3dB and I had no problems with dropouts:
Today the line was unusable with the same settings. I bumped the SNR percentage up to 145% which brings it to around 6dB and I will have to increase it once again as the internet is dropping out, which makes no sense to me:
Why did the 9dB target not stick or was it only reset?
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