## 3 Scenario Description and Connectivity Network Configuration
### Ubiquitti Network Devices and Measurements
Spectral measurements in 5 GHz frequency band and graphs generation are carried out using AirView Spectrum Analyzer software incorporated in Ubiquitin devices. The resulting spectral measurements of Almagra and La Ceiba nodes are analyzed. The spectral measurements are presented graphically in Figures 6 and 7; abscissa axis corresponds to evaluated frequencies, and the ordinate axis represents the scan elapsed time (in seconds). Figures 6 and 7 show Almagra and La Ceiba nodes frequency analysis in waterfall view, where the color range in the upper right part of each figure represents power levels for each frequency in the selected range. In Almagra node measurements (Figure 6), the dark blue color represents the lowest level (\(-117\) dBm), passing through the intermediate levels in green and yellow colors before reaching the maximum level, represented in red color (\(-97\) dBm). Similarly, La Ceiba node measurements show close values in the lowest signal intensity (\(-117\) dBm), but the highest signal intensity varies (\(-82\) dBm), as can be seen in Figure 7.  
Figure 5: Delimited perimeters. La Ceiba municipality (**a**) and Almagra hill surrounding area (**b**). Source: Google Earth. Almagra and La Ceiba node measurements coincide in those frequencies where the lowest power levels were recorded (dark blue color between 5755 and 5760 MHz and 5790-5795 MHz). However, they differ in the maximum power levels values recorded since in La Ceiba node measurements, and there are no red marks. According to the color ranges presented in Figures 6 and 7, the Almagra node shows a radiofrequency signals incidence that covers most of the scanned frequencies at medium-high power levels. The Almagra hill, due to its elevation, represents an obstacle to the line of sight for point-to-point links between the municipalities of Ovejas and Chalan. At the same time, it is also used as a strategic site to install signal repeater towers in its highest parts, making Almagra hill is a place where the following trajectories of multiple signals interconnect the municipalities with each other and with their townships coincide. Figures 8 and 9 show Almagra and La Ceiba nodes frequency analysis in waveform view; the abscissa axis corresponds to evaluated frequencies, and the ordinate axis represents the detected signals power levels (in dBm). Figures 8 and 9 record electromagnetic noise levels in the area by measuring its power in decibel milliwatts (dBm). The color range represents the number of times a power value was recorded using each frequency between 5725 and 5825 MHz, where blue color represents zero samples and red color represents 100 detected samples. According to Almagra node measurements (Figure 8), red color marks were observed all along evaluated frequencies in power levels around \(-110\) dBm, and consistently, the frequency ranges that record fewer data were the same that presented the lowest power levels in Figure 6.  
Unlike Almagra node measurements, in La Ceiba, node spectral noise analysis presented in Figure 9 were measured a \(-87\) dBm power level between 5735 and 5755. It was also observed that electromagnetic noise levels remain lower \(-100\) dBm in the frequency range evaluated, and consistently, the frequency ranges that record fewer data were the  
Figure 6: Waterfall view of Almagra node frequency analysis in Ovejas municipality rural area. Source: AirView Spectral Analyzer software. Figure 7: Waterfall view of La Ceiba node frequency analysis in La Ceiba township. Source: AirView Spectral Analyzer software. same that presented the lowest power levels. Red color marks were observed all along evaluated frequencies in power levels around \(-110\) dBm in Figure 9.  
Additionally, looking at Figures 8 and 9, it could be seen a difference between power levels measured in the Almagra node (Ovejas municipality rural area) and La Ceiba node (Chalan municipality township).