Quality Spectrogram

This plot shows the channel quality statistics for selected range of channels or frequencies. This chart can also be configured to show channel availability, the percentage of each channel that is unused and available for additional traffic.

Channel Quality is a weighted metric derived from key parameters which include noise, non-Wi-FiWi-Fi is a technology that allows electronic devices to connect to a WLAN network, mainly using the 2.4 GHz and 5 GHz radio bands. Wi-Fi can apply to products that use any 802.11 standard.(interferer) utilization and duty-cycles and certain types of retries. Quality levels are indicated by a range of colors between dark blue, which represents a higher channel quality, and red, which represents a lower channel quality. Channel availability is indicated by a range of colors between dark blue, which represents 100% channel availability, and red, which represents 0% availability.

For additional information on interpreting a nArubaSpectrogram plot, seeSwept Spectrogram.

The Spectrum Analysis Quality Spectrogram chart measures channel data each second, so after every 5-second sweep, the newest data appears as a thin colored line on the bottom of the chart. Older data is pushed up higher on the chart until it reaches the top of the spectrogram and ages out. The example below shows theArubaQuality Spectrogram chart after it has recorded over 1,500 seconds ofFFTFast Fourier Transform. FFT is a frequency analysis mechanism that aims at faster conversion of a discrete signal in time domain into a discrete frequency domain representation. See also DFT.data.

When you hover your mouse over any part of the spectrogram, a tooltipshows the devices the spectrum monitor detected on that frequency, theBSSIDBasic Service Set Identifier. The BSSID identifies a particular BSS within an area. In infrastructure BSS networks, the BSSID is the MAC address of the AP. In independent BSS or ad hoc networks, the BSSID is generated randomly.of the device (if applicable), the power level of the device indBmDecibel-Milliwatts. dBm is a logarithmic measurement (integer) that is typically used in place of mW to represent receive-power level. AMP normalizes all signals to dBm, so that it is easy to evaluate performance between various vendors., the time the device was last seen by the spectrum monitor, and the channels affected by the device.

下表描述了您可以使用的其他可选参数来自定义质量谱图。单击此图表右上角的向下箭头，然后单击Optionsmenu to access these configuration settings. Once you have configured the desired parameters, clickOKat the bottom of theOptionsmenu to save your settings and return to the spectrum dashboards.

Table 1:Quality Spectrogram Options

Parameter	Description
BandBand refers to a specified range of frequencies of electromagnetic radiation.	RadiobandBand refers to a specified range of frequencies of electromagnetic radiation.displayed in this graph. For spectrum monitor radios using the 5GHzGigahertz.radiobandBand refers to a specified range of frequencies of electromagnetic radiation., click theBanddrop-down list and select5GHz Low,5GHz Centeror5GHz Highto display data for that portion of the 5GHz radiobandBand refers to a specified range of frequencies of electromagnetic radiation.. This parameter is not configurable for graphs created by hybrid APs or spectrum monitor radios that use the 2.4GHzGigahertz.radiobandBand refers to a specified range of frequencies of electromagnetic radiation..
Channel Numbering	This parameter is not configurable for graphs created by hybrid APs or spectrum monitor radios that use the 2.4GHzGigahertz.radiobandBand refers to a specified range of frequencies of electromagnetic radiation.. A hybrid AP on a 20MHzMegahertzchannel sees 40MHzMegahertzWi-FiWi-Fi is a technology that allows electronic devices to connect to a WLAN network, mainly using the 2.4 GHz and 5 GHz radio bands. Wi-Fi can apply to products that use any 802.11 standard.data as non-Wi-FiWi-Fi is a technology that allows electronic devices to connect to a WLAN network, mainly using the 2.4 GHz and 5 GHz radio bands. Wi-Fi can apply to products that use any 802.11 standard.data. For spectrum monitors using the 5GHzGigahertz.radiobandBand refers to a specified range of frequencies of electromagnetic radiation., click theChannel Numberingdrop-down list and select either20 MHzor40 MHzchannel numbering to identify a channel numbering scheme for the graph. Graphs for AP radios that support802.11ac802.11ac is a wireless networking standard in the 802.11 family that provides high-throughput WLANs on the 5 GHz band.include an additional80MHzoption for very-high-throughput channels.
X-Axis	Select eitherChannelorFrequencyto show the quality spectrogram for a range of channels or frequencies.
Channel Range	Specify a channel range to determine which channels appear in the x-axis of this chart. Click the first drop-down list to select the lowest channel in the range, then click the second drop-down list to select the highest channel to appear in the chart. NOTE:This parameter is not configurable for graphs created by hybrid APs.
Color-Map Range	如果这个图表是相依igured to show quality spectrogram,the default color range on this chart represents values from 0 to 100.