Internet stops working when SNR drops below 6dB
Hi gus,
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.
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
#
Hi Townman
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?
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?