Signal to Noise Ratio

Signal to Noise Ratio report reveals lowest overall radio frequency (RF) signal-to-noise (SNR) percentages observed for the selected duration. SNR is particularly important for wireless networking for ensuring QoS for voice and other continuous media traffic over IP. When measured in dB, SNR should fall between 25 and 40 dB —where:

SNR >= 40dB. Excellent.
25dB < SNR < 40dB. Good.
SNR < 25dB. Poor.

SNR is calculated by subtracting the wireless signal strength from that of the noise floor. Poor signal to noise ratio can occur due to hardware transmit issues, nearby devices emitting radio frequency interference (RFI), and other sources of higher than normal RFI present in the ambient that combine to contribute to the normal background noise also referred to as the noise floor.

Device. Device hostname, IP address, or custom label.
Min. Lowest average signal to noise ratio observed during the selected interval.
Max. Highest average signal to noise ratio observed during the selected interval.
Avg. Average signal to noise ratio for the selected time interval.

Note: Percentages reported likely will never reach 0 or 100. Generally, An SNR of 40% is considered good. Anything less than 20% is considered poor.

Generate a report

Choose Device. Choose one or more host devices you want Signal to Noise Ratio measurements for.

Choose time constraints. (,) Choose times for the Signal to Noise Ratio. (For recently observed measurements, select Last Polled from the Date Range drop down list.)

Filter and reduce by row and by column. Sort and remove columns, group rows based on specific column values, and remove unwanted information from the table.

Chart, adjust output, and visualize. Fine tune report presentation and range of values displayed using the Report Settings dialog (optional).

Note: This report only returns Signal to Noise Ratio metrics for devices that already have the appropriate WMI or SNMP credentials. For more information, see Using Credentials.

Share, export, and save as PDF

Most generated Signal to Noise Ratio report data can be printed, shared, and exported when selecting Expand () from the Dashboard Options () menu. After the report has been expanded, select export () to access the following options:

Print/Export to PDF. Automatically generate a PDF file of the report.
Export Data. Export Signal to Noise Ratio data and leverage outside of WhatsUp Gold.
Schedule Export. Set a recurring date and time, format, and email destination for report data export.

Control	Purpose
Device	Browse and choose a single device.
Single Interface	Choose an interface on a device.
Device Group	Choose an existing group of one or more devices. You can also create custom or dynamic groups.

Control	Purpose
Date Range	Choose or define an overall date range.
Business hours	Focus on specific days of the week and periods within each day. Reveal trends that are sensitive to business hours, time zones, and other periodic attributes in the observed data.

Control	Purpose
Sort.	Sort column in ascending or descending order.
Columns.	Pick the columns you want to view. Click a check box to display the column. Clear the check box to hide it.
Group by this field.	Group table into collapsible rows wherever the current column contains identical data ("field") values.
Filters.	Provide a keyword to view only rows that contain the keyword for this column.

Control	Purpose
Show Top n Items	Limit items to the samples with the highest (or lowest) interface errors.
Threshold Type	Switch between minimum or maximum mode for cutoff values for the ranked list. At or Over. Show peak occurrence period. (Observations equal to or greater than Threshold.) At or Under. Show occurrences equal to or less than Threshold.
Threshold (percent)	Baseline value used to trim ranked device list based on peak or subpeak periods when returning the Top n.

Control	Purpose
Display Options	Present data as a chart, a table grid, or both.
Chart Type	Gauge charts. Available when you select a Date Range of Last Polled . Time series. Available when you select a Date Range interval (Today , for example). Line/Area. Scatter graph that connects adjacent measurements with straight lines. Spline/Area Spline. Choose a graph with a smoothed appearance where adjacent samples exhibit a gradual slope.
Chart Options	Legend, Grid Lines, Range Selector. Include legend, grid lines, and range selector for readability. Trend Lines. Present data with a smoothed average to show trend. Vertical Axis Scale. Automatically scale to fit data or specify a finite range.