UHF- Ultra High Frequency (between 300 MHz and 3 GHz) UHF radio waves propagate mainly by line of sight; they are blocked by hills and large buildings although the transmission through building walls is strong enough for indoor reception. They are used for television broadcasting, cell phones, satellite communication including GPS, personal radio services including Wi-Fi and Bluetooth, walkie-talkies, cordless phones, and numerous other applications. The IEEE defines the UHF radar band as frequencies between 300 MHz and 1 GHz. Two other IEEE radar bands overlap the ITU UHF band: the L band between 1 and 2 GHz and the S band between 2 and 4 GHz. One of the biggest pros of UHF radios is that they do a much better job of penetrating barriers in urban locations, like concrete, steel, and wood. So this kind of radio is best suited for use indoors, including buildings with multiple floors, in industries such as manufacturing, distribution, education, retail, hospitality, and healthcare. Th
Synchronous Digital Hierarchy (SDH) adalah sekelompok tingkat transmisi serat optik yang mengangkut sinyal digital dengan kapasitas yang berbeda. Teknologi SDH memungkinkan aliran data kecepatan bit rendah untuk digabungkan dengan aliran data kecepatan tinggi. Selain itu, karena seluruh jaringan sinkron, ini memungkinkan pengguna untuk menyematkan dan mengekstrak aliran bit individu dari aliran data berkecepatan tinggi dengan relatif mudah. SDH adalah versi Standarisasi Synchronous Optical Network ( SONET ) dari International Telecommunication Union Sektor Standar . Kedua teknologi tersebut menyediakan interkoneksi jaringan yang lebih cepat dan lebih murah daripada peralatan Plesiochronous Digital Hierarchy (PDH) tradisional. https://www.rfwireless-world.com/Terminology/PDH-vs-SDH.html https://www.rfwireless-world.com/Terminology/SONET-vs-SDH.html SDH digunakan dalam sistem transmisi untuk Jaringan Digital Layanan Terpadu broadband dan untuk mengangkut sel Mode
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