Noise margin
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- Re: Noise margin
Noise margin
11-11-2017 3:36 PM - edited 11-11-2017 3:37 PM
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9 - Noise margin: 5.9/3.0
10 - Line attenuation: 13.9/17.0
I got a very low noise margin and my ADSL connection keeps dropping when there is intense traffic. Nothing has changed indoors, same modem, same cables.
It used to work perfectly for the last 1.5 years.
Could it be cables outside? How to check this?
Re: Noise margin
14-11-2017 3:11 PM
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Hi,
A warm welcome to the forums.
The normal margin is 6dB but some lines work perfectly well at 3dB. Might be best to cover some basics - take a look at the BB speed issues link below.
Broadband is not going to work well if the "phone" line is not working properly.
Please perform a quiet line test - dial 17070 select option 2 using a corded phone plugged into the test socket behind the face plate of the master socket. It should be silent. A noisy phone line (or no dial tone) will have a marked adverse impact on the performance of broadband.
If the line is noisy or there is no dial tone, then a PHONE LINE fault needs to be raised with your phone provider. If this is PlusNet, you can report a fault on line using the button below.
How is your line performing?
Please post your router stats; for PN TG582n and 2704n routers use the buttons below, for other routers look at the Kitz link.
Also run a BT Wholesale speed test (ideally using an Ethernet wired PC with the WiFi turned off) then run the further diagnostics and post the results here. DO NOT REBOOT the router!
Also find your CURRENT SPEED (PlusNet line profile) from the PlusNet user portal - you will need to log in.
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: Noise margin
14-11-2017 3:49 PM
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Sorry, I do not have a phone to do the line noise test.
Here are the ADSL statistics from the link you provided.
|
||||
Mode: | ADSL_2plus | |||
Traffic Type: | ATM | |||
Status: | Up | |||
Link Power State: | L0 | |||
Downstream | Upstream | |||
Line Coding(Trellis): | On | On | ||
SNR Margin (1 dB): | 3.0 | 5.9 | ||
Attenuation (1 dB): | 17.0 | 13.9 | ||
Output Power (1 dBm): | 0.0 | 12.7 | ||
Attainable Rate (Kbps): | 15312 | 436 | ||
Path 0 | Path 1 | |||
Downstream | Upstream | Downstream | Upstream | |
Rate (Kbps): | 15166 | 435 | 0 | 0 |
MSGc (# of bytes in overhead channel message): | 54 | 13 | 0 | 0 |
B (# of bytes in Mux Data Frame): | 254 | 12 | 0 | 0 |
M (# of Mux Data Frames in FEC Data Frame): | 1 | 1 | 0 | 0 |
T (Mux Data Frames over sync bytes): | 2 | 4 | 0 | 0 |
R (# of check bytes in FEC Data Frame): | 0 | 0 | 0 | 0 |
S (ratio of FEC over PMD Data Frame length): | 0.5369 | 0.9369 | 0.0 | 0.0 |
L (# of bits in PMD Data Frame): | 3799 | 111 | 0 | 0 |
D (interleaver depth): | 1 | 1 | 0 | 0 |
Delay (msec): | 0 | 0 | 0.0 | 0.0 |
INP (DMT symbol): | 0.00 | 0.00 | 0.0 | 0.0 |
Super Frames: | 0 | 0 | 0 | 0 |
Super Frame Errors: | 165472 | 31403 | 0 | 0 |
RS Words: | 0 | 3530842 | 0 | 0 |
RS Correctable Errors: | 0 | 0 | 0 | 0 |
RS Uncorrectable Errors: | 0 | 0 | 0 | 0 |
HEC Errors: | 1720699 | 9423 | 0 | 0 |
OCD Errors: | 0 | 0 | 0 | 0 |
LCD Errors: | 0 | 0 | 0 | 0 |
Total Cells: | 29604296 | 843294 | 0 | 0 |
Data Cells: | 1240196 | 275796 | 0 | 0 |
Bit Errors: | 0 | 120 | 0 | 0 |
Total ES: | 9820 | 25352 | ||
Total SES: | 3417 | 12 | ||
Total UAS: | 16740 | 13885 |
Re: Noise margin
14-11-2017 3:56 PM
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Something is odd here - a 17dB attenuated line ought to do far better than this - I suspect line noise.
A telephone hand set to be used as a diagnostic tool (if not for making calls) is an absolute essential. If you cannot pick one up for around £5 (e.g. from Tescos) then can you borrow one?
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: Noise margin
14-11-2017 3:58 PM
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I will try to get one from work tomorrow and do the test. Will report back soon.
Thanks!
Re: Noise margin
16-11-2017 5:19 PM
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Hi there.
I'm sorry to hear you're experiencing connection problems.
Testing your line is finding a potential fault at the exchange so I've reported that through to Openreach now. We've not received confirmation of the fault being accepted but we'll let you know when we know more via this ticket.
Re: Noise margin
16-11-2017 5:25 PM
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Odd PPP session durations - they all look circa 2+ a bit hours or multiples there of...
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: Noise margin
20-11-2017 4:58 PM
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Re: Noise margin
20-11-2017 6:14 PM
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First few hours of use and it seems to have improved. I will keep monitoring for a few days and report back.
Thanks for the help!
Here are the new stats
Mode: | ADSL_2plus | |||
Traffic Type: | ATM | |||
Status: | Up | |||
Link Power State: | L0 | |||
Downstream | Upstream | |||
Line Coding(Trellis): | On | On | ||
SNR Margin (1 dB): | 3.8 | 6.3 | ||
Attenuation (1 dB): | 9.0 | 3.6 | ||
Output Power (1 dBm): | 0.0 | 12.5 | ||
Attainable Rate (Kbps): | 23888 | 1252 | ||
Path 0 | Path 1 | |||
Downstream | Upstream | Downstream | Upstream | |
Rate (Kbps): | 24172 | 1251 | 0 | 0 |
MSGc (# of bytes in overhead channel message): | 58 | 12 | 0 | 0 |
B (# of bytes in Mux Data Frame): | 254 | 38 | 0 | 0 |
M (# of Mux Data Frames in FEC Data Frame): | 1 | 1 | 0 | 0 |
T (Mux Data Frames over sync bytes): | 3 | 4 | 0 | 0 |
R (# of check bytes in FEC Data Frame): | 0 | 0 | 0 | 0 |
S (ratio of FEC over PMD Data Frame length): | 0.3371 | 0.9904 | 0.0 | 0.0 |
L (# of bits in PMD Data Frame): | 6051 | 315 | 0 | 0 |
D (interleaver depth): | 1 | 1 | 0 | 0 |
Delay (msec): | 0 | 0 | 0.0 | 0.0 |
INP (DMT symbol): | 0.00 | 0.00 | 0.0 | 0.0 |
Super Frames: | 0 | 0 | 0 | 0 |
Super Frame Errors: | 21372 | 3007 | 0 | 0 |
RS Words: | 0 | 1254230 | 0 | 0 |
RS Correctable Errors: | 0 | 0 | 0 | 0 |
RS Uncorrectable Errors: | 0 | 0 | 0 | 0 |
HEC Errors: | 149175 | 1333 | 0 | 0 |
OCD Errors: | 0 | 0 | 0 | 0 |
LCD Errors: | 0 | 0 | 0 | 0 |
Total Cells: | 259980103 | 13430181 | 0 | 0 |
Data Cells: | 185210735 | 8375448 | 0 | 0 |
Bit Errors: | 0 | 0 | 0 | 0 |
Total ES: | 958 | 1684 | ||
Total SES: | 458 | 6 | ||
Total UAS: | 3617 | 3196 |
Re: Noise margin
20-11-2017 8:33 PM
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