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Oi Fixo (landline service, formerly Telefone Telemar) Oi Móvel (mobile service, cornerstone of the Oi brand) Oi Velox (ADSL, 3G formerly Velox) Oi Internet (ISP) 31 (long-distance and international calling) Oi Wi-Fi (Wi-Fi access, at home or via hotspots) Oi TV (DTH pay TV) Oi Voip (Voice over IP) In 2010, Portugal Telecom acquired 22.4% of Oi ...
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[1] [2] The light is a form of carrier wave that is modulated to carry information. [3] Fiber is preferred over electrical cabling when high bandwidth, long distance, or immunity to electromagnetic interference is required. [4] This type of communication can transmit voice, video, and telemetry through local area networks or across long ...
One purpose of doping is to raise the refractive index (e.g. with germanium dioxide (GeO 2) or aluminium oxide (Al 2 O 3)) or to lower it (e.g. with fluorine or boron trioxide (B 2 O 3)). Doping is also possible with laser-active ions (for example, rare-earth-doped fibers) in order to obtain active fibers to be used, for example, in fiber ...