WSC SNR graph

Hi,
We have a issue with viewing SNR graph and getting previous statistics.
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When I look at the Monitor->Access Point->Access_point_Name->Mesh links-> link detail (parent) system shows link statistics graphs only for one day.
If I select to view 1 week for example then all data older that one day are truncated and not shown on statistics graphs.
Please see attached picture as an example.
WLC ver. 6.0.182.0 Boot version 5.2.157.0
WCS ver 6.0.170.0
This is for node which is up and running for almost one week already but graph data starts only from yesterday (March 30).
When I checked yesterday graph was starting from march 29 however the system has facility to give us last 1 month, last 1 week etc.
May be I miss some settings in WCS for this, but I expected that system just keeps filling statistical database without truncating any data and we will be able to see even 1year statistics on the graph.
thanks

Hi sschmitd,
Sorry for the late response being our weekend on Friday/Saturday. However here are the values you requested in the attached image file. These values are default, nothing was changed since from WCS installation - should keep data for at least one month but WCS shows data only for one day

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How to read the statistics graph?

Hi,
I'm trying to troubleshoot some network issues. I have an AirPort Express connected to a DSL modem and acting as a wireless router. One computer connected is a Mac Pro with an AirPort Extreme card, and the other is a PC laptop with an Intel 2200BG wireless card. Both computers are connected, using the internet, sharing files, etc. I am using WPA2 encryption.
The Mac has a good stable connection while the PC disconnects frequently. The thing is that the PC is just a few feet away from the router, while the Mac is in the other room. Moreover, both computers show an excellent connection in their status.
I've opened Airport Utility in order to diagnose the problem. Looking at the statistics graph, I cannot seem to understand how to read it. I'm confused by the negative signals vs. noise signals, etc.
Unfortunately, I cannot post a screenshot here, but here are the readings:
PC: Signal: -24, Noise: -95, Rate: 54
Mac: Signal: -73, Noise: -84, Rate: 78
This is cryptic to me, so I'd appreciate any explanation of the data.
Thanks!

PC: Signal: -24, Noise: -95, Rate: 54
Mac: Signal: -73, Noise: -84, Rate: 78
In general, the greater the value, the better. Both Signal & Noise are measured in dBm. dBm is a measure of absolute power output. An increase in 10 dBm = 10x increase in output power.
We would use these values to calculate the Signal-to-Noise Ratio (SNR). SNR = Signal - Noise.
To use your measurements for examples, the SNR would be:
o PC: -24 dBm -(-95 dBm) = 71 dB
o Mac: -73 dBm -(-84 dBm) = 11 dB
To put this into perspective, the SNR influences the instantaneous data rate (speed). The higher the SNR, the higher the data rate (up to the maximum bandwidth of the radio being used).
For reference, use the following SNR Guideline:
o 40dB+ SNR = Excellent signal
o 25dB to 40dB SNR = Very good signal
o 15dB to 25dB SNR = Low signal
o 10dB to 15dB SNR = Very low signal
o 5dB to 10dB SNR = No signal
Again, going back to the SNRs we just calculated, the PC is getting an excellent connection to the AX, while the Mac is not.
Finally, the 'Rate" value is a near instantaneous measure of the data rate or throughput. It is measured in Mega bits per second (Mbps). Its value should never exceed the maximum bandwidth appropriate for the radio mode. For 802.11g that bandwidth would be 54 Mbps; for 802.11n (2.4 GHz), 130 Mbps, and for 802.11n (5 GHz), 300+ Mbps.

Target SNR reset

I have had some REIN problems on my line due to a neighbours treadmill. All sorted now and have had a stable connection for over 3 days. Just wondered if/how I can contact the Mods to get a target SNR reset on my line? Stats from router below (doesn't report up-time). Also a graph from Routerstats showing my very steady noise margin.
Thanks,
Mark.
Modem Type:
Built in modem - ADSL
DSL Line (Wire Pair):
Line 1 (inner pair)
Current DSL Connection:
Down                                                                                                         Up
Rate:
2720 kbs
448 kbs
Max Rate:
2408 kbs
836 kbs
Noise Margin:
10.0 dB
18.0 dB
Attenuation:
59.1 dB
31.5 dB
Output Power:
17.9 dBm
11.9 dBm
Protocol:
G.DMT Annex A
Channel:
Interleaved
DSLAM Vendor Information
Country: {3840} Vendor: {ALCB} Specific: {0                              }
ATM PVC:
0/38
Rate Cap:
2408 kbs
Attenuation @ 300kHz:
59.1 dB
Uncanceled Echo:
-17.2 dB
Ok
VCXO Frequency Offset:
-8.7 ppm
Ok
Final Receive Gain:
34.5 dB
Ok
Excessive Impulse Noise:
0
Ok
Solved!
Go to Solution.

Hi
I am sorry to see you are having problems
I suggest you contact the forum mods they should be able to get this problem sorted for you this is a link to them http://bt.custhelp.com/app/contact_email/c/4951
They normally reply by email or phone directly to you within 3 working days they will take personal ownership of your problem until resolved and will keep you informed of progress
They are a UK based BT specialist team who have a good record at getting problems solved
This is a customer to customer self help forum the only BT presence here are the forum moderators
If you want to say thanks for a helpful answer,please click on the Ratings star on the left-hand side If the reply answers your question then please mark as ’Mark as Accepted Solution’

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Taslim,
Typically signal to noise ratio is defined on simple signals such as sine waves. Even if you have a "clean" version of the ECG signal, you cannot simply subtract or divide it because it will have a a slight phase shift and probably a small difference in the waveform due to the separation of the ECG electrodes from the EMG electrodes.
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Hey HustLiliAn,
Here are 2 other forum posts that had good responses about SNR and VIs that can be used to take the measurement:
http://forums.ni.com/t5/LabVIEW/Signal-to-Noise-Ratio-SNR-measurement/td-p/99326
http://forums.ni.com/t5/LabVIEW/how-to-calculate-signal-to-noise-ratio-from-the-graph/td-p/813558
If you are looking at the average power, SNR is just Psignal/Pnoise. If you are looking at the amplitude of your signal, then you need to look at the RMS amplitude. In that case you would use the formula (Asignal/Anoise)^2.
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What does this metric in WCS tell us, exactly? I could not find an explenation in any of the guides.
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I found this to be a good explanation of SNR Cutoff recommendations which this graph seems to relate to. Basically it tells you for the radio
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http://www.wi-fiplanet.com/tutorials/article.php/3468771
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Heya all,
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Asn additional note, there's a neighbor of mine around the corner who's got the same product, going to the same cabinet, and they don't have any of these problems.
This is the current state of my connection as of 2014/07/17 09:47:35:
http://brins0.net:5555/~mhisani/vdsl/2014-07-17/ConnectionStats-2014-07-17-09.47.35.txt
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There are many days worth of stats here to browse:
http://brins0.net:5555/~mhisani/vdsl/
Hardware:
Modem: Huawei HG612v3b
Router: Asus N66U (Tomato v1.28)
Faceplate: NTE5 (Mk2 SSFP)
No extensions
no bell wire
no phones plugged in
Line to modem is under 1m long
If there's any other information, at all, which will help diagnose my problem, please let me know and I'll do my best to provide it.
Please help!

Can you try the above mentioned program in order to monitor the errors on your line ? You should be able to tell as and when the errors start to increase dramatically which in tirn, can make it easier to narrow down any problems.....
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