Penalty of €2,800 after interfering with the Wi-Fi to the AEMET meteorological radar, eliminating the DFS protection

2022-11-27 21:00:25 By : Mr. Joy Kenix

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The CNMC sanctions a wireless operator in Valencia that telecommunications located interfering with the signal of the AEMET meteorological radar in Cullera by having deactivated the DFS protection in its equipment with which it commercialized air fiber. Network Booster

Penalty of €2,800 after interfering with the Wi-Fi to the AEMET meteorological radar, eliminating the DFS protection

In recent years, hundreds of small local operators have grown in the heat of the decline of ADSL and the absence of fiber in areas far from urban centers, using FWA wireless technologies.The deployment of these networks is very economical since it is only necessary to rent land at the highest point of the area to be covered, where the antenna that will serve the neighborhood is installed through point-to-multipoint links that use low-cost Wi-Fi technology.The companies that exploit them do not need to request permission to use the spectrum since they use commonly used bands.However, nothing exempts them from complying with power limits and protection mechanisms so as not to interfere with other priority services that historically use these frequencies.

TPC and DFS are two of the mechanisms that all wireless access points are required to use in order to broadcast on certain frequencies.The first requires reducing the emission power to the minimum necessary for communication to be possible, thus preventing the waves from invading a larger area than necessary.The second forces access points to listen before broadcasting and leave the channel in case a radar is using it.Weather radars use some of the frequencies of the 5 GHz band to analyze the density and evolution of rain, and their image is distorted when a Wi-Fi signal interferes with its frequency.

Respecting this regulation is disadvantageous for private users and even more so for companies, since DFS can cause an interruption of up to 10 minutes in the service received by all customers when a nearby radar pulses.This is what happens in the areas close to the 15 meteorological radars that AEMET operates in Spain.

Despite the fact that the regulations prohibit it, some computers allow you to disable the DFS mechanism.Unscrupulous companies use this possibility to prioritize their emissions, ignoring the presence of radar.We can see the result on the radar observation page of the AEMET1 website, where those located in Corbera (Barcelona) and Cullera (Valencia) draw strange radial lines around the observation point.They are the interferences coming from nearby Wi-Fi points with DFS disabled.

The Provincial Telecommunications Inspection Headquarters is from where it is controlled that the use of the spectrum that is made throughout the country complies with the regulations.One of its most versatile instruments for hunting pirates of the airwaves are the mobile radio direction-finding units, a kind of patrol of the airwaves that operates with 17 vehicles equipped with everything necessary to locate the source of a broadcast and identify its authors.

Between December 2019 and February 2020, SETID identified a Wi-Fi network broadcasting at 5620 MHz without DFS, on the same frequency used by the AEMET radar located in Monte de Oro in Cullera, Valencia.The inspectors located the transmitting Wi-Fi antenna in a building and a neighbor informed them that it belonged to the Esystel company.

In a visit days later to the site in the presence of the operator, they verified that they had changed the frequency to 5,240 MHz. The frequency originally used falls just above channel 120, in the most conflictive area of ​​the 5 GHz band where the regulations are stricter. while the second frequency corresponds to channel 48 out of the DFS channels.

Parallel to the sanctions that may come from the SETID for interfering with other services, the complaint was transferred to the CNMC, which led to another investigation for the company not being registered in the operator registry since 2017, given that its registration had expired.Esystel defended itself by claiming that it was in dissolution, but the CNMC considers it proven2 that it maintained activity until February 2022, marketing its wireless internet as AirFibra.Its declared turnover in 2020 was around €280,000, which is what has been taken as a reference to penalize €2,800 for providing electronic communications services without appearing in the registry, which is considered a very serious administrative offence.

You tell me this or you tell me, I live in a place where there is no way to get the free spectrum of 5 GHz, there are already many involved in the DFS channels because there is nothing clean for WISP, you have 3 or 4 wiferos in the area and it's criminal, they have everything mined and you yourself are forced to get into that swampy terrain if you want to provide service, legal service, beware, not a pirate as there are many out there on the loose.

The rain is opaque at the frequency that is opaque, you can't use the one you want, you have to use the one that works best.

Hello good, can you put God?Yes, look, let's see if you can raise the frequencies for the water a little because @JGeek00 loses his Wi-Fi while watching porn.

It seems little to me.

Why has the same frequency of the radars been used for Wi-Fi?

It has happened that in Europe these frequencies are used for weather radars, in other areas the entire 5GHz band is free.That they could have already put in a trick when it comes to defining the standard from the EU or something, but nothing, here we are.

It is no coincidence, and it is not only in Europe.The frequency has a reason for being and is used in many more places, for example the US.

Another great enemy of Aemet radars are the wind farms located near these radars, due to the fact that the propagation of the signal emitted by the radars is slowed down or diverted by the huge blades in continuous movement, causing false reflectivity echoes.

If we add 5G networks, illegal radio frequency spectrum, wind farms... in the end, Aemet's effectiveness will be called into question.

Penalty of €2,800 after interfering with the Wi-Fi to the AEMET meteorological radar, eliminating the DFS protection

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