{"id":31319,"date":"2021-02-23T17:18:42","date_gmt":"2021-02-23T16:18:42","guid":{"rendered":"https:\/\/www.atim.com\/faq\/"},"modified":"2022-10-06T15:19:01","modified_gmt":"2022-10-06T14:19:01","slug":"faq","status":"publish","type":"page","link":"https:\/\/www.atim.com\/en\/faq\/","title":{"rendered":"Ressources FAQ EN"},"content":{"rendered":"\t\t
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A question?<\/div><\/div><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Answers<\/strong> to the most frequently asked questions<\/strong> at your disposal.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\tIn the absence of answers to your problem, we invite you to contact our technical support<\/a>.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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 <\/p>\n

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Prerequisits Radio - IoT - M2M<\/h2>\n
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    In an IoT sensor or M2M modem, the antenna plays an important role in the transmission of data:<\/p>

    - 1\/4 wave antennas (ANT868-14-MAR-S2 or ANT868-14S4.0) require a ground plane. Without it, the performance of the antenna will be almost zero. It is very important to install the antenna with a sufficient ground plane in order to achieve maximum efficiency.<\/p>

    - The antenna must always be placed upwards, high and free of metallic obstacles (leave a free diameter of at least 20cm and ideally 1m)<\/p>

    - Antenna cable connectors and adapters can cause significant losses in radio quality. Depending on the type of cable used, the loss will be greater or lesser [for lengths greater than 3m it is recommended to use the CFP10 cable ref (10mm diameter)].<\/p><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t

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    Propagation of radio waves<\/strong><\/p>

    Radio waves (RF stands for Radio Frequency) propagate in straight lines in several directions. The propagation speed of waves in a vacuum is 3.108<\/span>\u00a0m\/s.<\/p>

    In any other medium, the signal is weakened by
    \u2013 reflection
    \u2013 refraction
    \u2013 diffraction
    \u2013 absorption<\/p>

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    Absorption of radio waves<\/strong><\/p>

    When a radio wave encounters an obstacle, part of its energy is absorbed and transformed into energy, part continues to propagate in an attenuated manner and part may eventually be reflected.<\/p>

    \u00a0<\/p>

    Reflection of radio waves<\/strong><\/p>

    When a radio wave encounters an obstacle, all or part of the wave is reflected, with a loss of power.<\/p>

    The reflection is such that the angle of incidence is equal to the angle of reflection.<\/p>

    \u00a0<\/p>

    Properties of media<\/strong><\/p>
    MATERIAL<\/th>ATTENUATION<\/th>EXAMPLES<\/th><\/tr><\/thead>
    Air<\/td>None<\/td>Open space, courtyard<\/td><\/tr>
    Wood<\/td>Low<\/td>Door, floor, partition<\/td><\/tr>
    Plastic<\/td>Low<\/td>Partition<\/td><\/tr>
    Glass<\/td>Low<\/td>Non tinted glass<\/td><\/tr>
    Verre teint\u00e9<\/td>Medium<\/td>Vitres teint\u00e9es<\/td><\/tr>
    Water<\/td>Medium<\/td>Aquarium, fountain<\/td><\/tr>
    Living beings<\/td>Medium<\/td>Crowd, animals, humans, vegetation<\/td><\/tr>
    Bricks<\/td>Medium<\/td>Walls<\/td><\/tr>
    Plaster<\/td>Medium<\/td>Partitions<\/td><\/tr>
    Ceramic<\/td>High<\/td>Tiles<\/td><\/tr>
    Paper<\/td>High<\/td>Paper rolls<\/td><\/tr>
    Concrete<\/td>High<\/td>Load-bearing walls, floors, pillars<\/td><\/tr>
    Armoured glass<\/td>High<\/td>Bulletproof glass<\/td><\/tr>
    Metal<\/td>Very high<\/td>Reinforced concrete, mirrors, metal cabinet, lift shaft<\/td><\/tr><\/tbody><\/table><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t
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    LPWAN is an acronym for Low Power Wide Area Network.<\/p>

    LPWANs emerged in the 2010s as a new model for long-range, low-power wireless communication.<\/p>

    LoRaWAN, Sigfox, LTE-M or NB-IoT are all part of LPWAN.<\/p><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n<\/div>\n