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SONET/SDH

* Cellular telephony provides communication between two devices. One or both may be mobile.
* A cellular service area is divided into cells.
* Advanced Mobile Phone System (AMPS) is a first-generation cellular phone system.
* Digital AMPS (D-AMPS) is a second-generation cellular phone system that is a digital version of AMPS.
* Global System for Mobile Communication (GSM) is a second-generation cellular phone system used in Europe.
* Interim Standard 95 (IS-95) is a second-generation cellular phone system based on CDMA and DSSS.
* The third-generation cellualr phone system will provide universal personal communication.
* A satellite network uses satellites to provide communication between any points on earth.
* A geosynchronous Earth orbit (GEO) is at the equatorial plane and revolves in phase with the earth.
* Global Positioning System (GPS) satellites are medium-Earth-orbit (MEO) satellites that provide time and location information for vehicles and ships.
* Iridium satellites are low-Earth-orbit (LEO) satellites that provide direct universal voice and data communications for handheld terminals.
* Teledesic satellites are low-Earth-orbit satellites that will provide universal broadband Internet access.