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  2. Satellite laser ranging - Wikipedia

    en.wikipedia.org/wiki/Satellite_laser_ranging

    The laser pulse can also be reflected by the surface of a satellite without a retroreflector, which is used for tracking space debris. [1] Satellite laser ranging is a proven geodetic technique with significant potential for important contributions to scientific studies of the earth/atmosphere/ocean system. It is the most accurate technique ...

  3. Free-space optical communication - Wikipedia

    en.wikipedia.org/wiki/Free-space_optical...

    Relays may be employed to extend the range for FSO communications. [10] [11] TMEX USA ran two eight-mile links between Laredo, Texas and Nuevo Laredo, Mexico from 1998 [12] to 2002. The links operated at 155 Mbit/s and reliably carried phone calls and internet service. [13] [dubious – discuss] [citation needed]

  4. Public switched telephone network - Wikipedia

    en.wikipedia.org/wiki/Public_switched_telephone...

    However analog two-wire circuits are still used to connect the last mile from the exchange to the telephone in the home (also called the local loop). To carry a typical phone call from a calling party to a called party , the analog audio signal is digitized at an 8 kHz sample rate with 8-bit resolution using a special type of nonlinear pulse ...

  5. Satellite Internet access - Wikipedia

    en.wikipedia.org/wiki/Satellite_Internet_access

    How satellite internet works. Satellite Internet generally relies on three primary components: a satellite – historically in geostationary orbit (or GEO) but now increasingly in Low Earth orbit (LEO) or Medium Earth orbit MEO) [20] – a number of ground stations known as gateways that relay Internet data to and from the satellite via radio waves (), and further ground stations to serve each ...

  6. Satellite phone - Wikipedia

    en.wikipedia.org/wiki/Satellite_phone

    A satellite telephone, satellite phone or satphone is a type of mobile phone that connects to other phones or the telephone network by radio link through satellites orbiting the Earth instead of terrestrial cell sites, as cellphones do. Therefore, they can work in most geographic locations on the Earth's surface, as long as open sky and the ...

  7. Landline - Wikipedia

    en.wikipedia.org/wiki/Landline

    Landline service is typically provided through the outside plant of a telephone company's central office, or wire center. The outside plant comprises tiers of cabling between distribution points in the exchange area, so that a single pair of copper wire, or an optical fiber, reaches each subscriber location, such as a home or office, at the network interface.

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