Low SNR
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Low SNR
30-11-2014 2:37 AM
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Had a replacement router, still same, and I'm not sure why..... It's semi-stable but I get resyncs randomly, even get PPPoA drops too.
Here are my stats:
Quote Uptime: 0 days, 1:32:55
DSL Type: ITU-T G.992.5
Bandwidth (Up/Down) [kbps/kbps]: 888 / 13,887
Data Transferred (Sent/Received) [MB/MB]: 9.00 / 27.67
Output Power (Up/Down) [dBm]: 11.9 / 0.0
Line Attenuation (Up/Down) [dB]: 14.6 / 29.5
SN Margin (Up/Down) [dB]: 11.1 / 3.1
System Vendor ID (Local/Remote): TMMB / ----
Chipset Vendor ID (Local/Remote): BDCM / IFTN
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): -
Error Seconds (Local/Remote): 174 / 0
FEC Errors (Up/Down): 20 / 124,792
CRC Errors (Up/Down): 13 / 5,843
HEC Errors (Up/Down): 28 / 33,301
Am I going mad? I'm sure I had a ~22db up / ~6db down when I wasn't on interleaving, which is meant to be more stable having it on..
Re: Low SNR
01-12-2014 2:01 PM
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I'm not sure the issue is directly related to interleaving so I've submitted an reset to get the downstream SNR back to 6db.
Let me know if you don't see any difference to this over the next 24 hours.
Re: Low SNR
02-12-2014 5:56 PM
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Re: Low SNR
02-12-2014 6:16 PM
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Re: Low SNR
04-12-2014 12:44 PM
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faults.plus.net
04-12-2014 5:53 PM
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I was in the middle of it when it decided to:
Now it states this all the time
Re: faults.plus.net
05-12-2014 9:16 AM
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Re: faults.plus.net
05-12-2014 5:58 PM
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So, something must be wrong.... Even changed filters, changed the RJ-11...... but still ~3db.
Re: faults.plus.net
05-12-2014 6:29 PM
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Can you please gather all of the information requested here - http://community.plus.net/forum/index.php/topic,96155.0.html - so that we can see what your line is doing at the moment. Some lines are quite happy running at 3dB - mine does all of the time and it thus gives me a bit more speed.
Kevin
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Re: faults.plus.net
06-12-2014 8:42 AM
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1.
Quote Uptime: 0 days, 10:06:23
DSL Type: ITU-T G.992.5
Bandwidth (Up/Down) [kbps/kbps]: 888 / 13,832
Data Transferred (Sent/Received) [MB/MB]: 74.58 / 948.33
Output Power (Up/Down) [dBm]: 11.6 / 0.0
Line Attenuation (Up/Down) [dB]: 14.7 / 29.5
SN Margin (Up/Down) [dB]: 13.7 / 3.7
System Vendor ID (Local/Remote): TMMB / ----
Chipset Vendor ID (Local/Remote): BDCM / IFTN
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): -
Error Seconds (Local/Remote): 412 / 0
FEC Errors (Up/Down): 44 / 802,672
CRC Errors (Up/Down): 0 / 619
HEC Errors (Up/Down): 0 / 11,376
2.
Quote a. Down 10.5Mbps (12.2Mbps), Up 0.47Mbps (0.83Mbps)
b. Down 11.7Mbps, Up 0.74Mbps, Ping 47.63
3.
Quote Estimated line speed: There's no speed estimate currently held on your account.
Current line speed: 12.2 Mb
No test socket... Have 2 BT outlets but unsure which is the master, both look like LJU's - 1 is in the living room and other in the bedroom.
Re: faults.plus.net
06-12-2014 10:37 AM
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Something looks not quite right here. Speed is a little slow for the reported figures. SNRM is still 3. Can you please do a restart around midday and repost the stats and I will take a look at them tomorrow.
Can you carefully remove the socket face plates. Look at the wires - colour and terminal numbers. You only need 2 & 5 connected, 3/4 can be removed if present.
Kevin
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Re: faults.plus.net
08-12-2014 10:12 AM
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If the line test is fine, then I'll proceed with alternative tweaks..... I ask for a test because a colleague said he had constant dropping, speed fluctuations and low SNR, he called BT (his isp) up and in the first instance he advised them monitoring the line for a few days, they called him back and sent an engineer out a few days later.....
Note: To my knowledge, I only have low SNR problems.....
Re: faults.plus.net
08-12-2014 10:42 AM
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Low SNRM is not a fundamental issue in its own right. SNRM is not static, it is variable due to "outside" causes. You believe that you are on a line with a target SNRM of 6dB. If this is correct, then there is some source of noise pushing the reported SNRM to 3dB at the time you happen to be looking.
For that reason I asked that you resynch the line during the muddle of the morning / day and immediately collected the stats. This will confirm what is your target SNRM.
Internal wiring can have an adverse impact on a line; you may feel that things were OK before, but that does not mean that they were as good as they might have been, nor that there has no deterioration since. I was round at a friend's house recently; they got between 9Mbps with stability and 2Mbps with no stability depending upon which phone socket they used.
Given Chris' post above, it looks as though there is a fault ticket open already.
Can you please take a look at your wiring and do that restart?
Kevin
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Re: faults.plus.net
08-12-2014 11:09 AM
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Re: faults.plus.net
08-12-2014 11:30 AM
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Sorry about asking for something personally challenging.
I can understand your doubt, but the additional wires, especially in older installations, can have a marked impact on speed, noise and stability. Newer wiring uses twisted pairs which reject high frequency noise, something highly desirable for ADSL technology but neither here nor there for voice.
The older wiring will be "solid" colours. The newer wiring will be colour+white-trace / white+colour-trace - the colour+white wires are twisted together within the cable. Usually the "blue pair" go to 2&5 and are the only wires required.
Kevin
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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.
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