circuit switching
91Optical mesh network — Transport network based on SONET/SDH ring architecture Optical mesh networks are a type of telecommunications network. Transport networks, the underlying optical fiber based layer of telecommunications networks, have evolved from DCS (Digital… …
92Packet switched network — A Packet Switched Network, or PSN, refers to the packet switched networks that existed before the Internet. The history of such networks can be divided into three eras:early networks before the introduction of X.25 and OSI,the X.25 era when many… …
935ESS switch — The 5ESS Switch is the Class 5 telephone electronic switching system sold by Alcatel Lucent. This digital central office telephone circuit switching system is used by many telecommunications service providers. HistoryThe 5ESS Class 5 Switch first …
94Public switched telephone network — The public switched telephone network (PSTN) is the network of the world s public circuit switched telephone networks. It consists of telephone lines, fiber optic cables, microwave transmission links, cellular networks, communications satellites …
95General Packet Radio Service — (GPRS) is a packet oriented mobile data service on the 2G and 3G cellular communication system s global system for mobile communications (GSM). GPRS was originally standardized by European Telecommunications Standards Institute (ETSI) in response …
96Clos network — In the field of telecommunications, a Clos network is a kind of multistage circuit switching network, first formalized by Charles Clos in 1953,[1] which represents a theoretical idealization of practical multi stage telephone switching systems.… …
97Telegraphy — (from the Greek words (τηλε) = far and (γραφειν) = write) is the long distance transmission of written messages without physical transport of letters. Radiotelegraphy or wireless telegraphy transmits messages using radio. Telegraphy includes… …
98Public land mobile network — In telecommunication, a public land mobile network (PLMN) is a network that is established and operated by an administration or by a recognized operating agency (ROA) for the specific purpose of providing land mobile telecommunications services… …
99Wide area network — (WAN) is a computer network that covers a broad area (i.e., any network whose communications links cross metropolitan, regional, or national boundaries cite book last =Groth first = David authorlink = coauthors = Toby Skandier title = Network+… …
100Alexander G. Fraser — Dr. Alexander G. Fraser, also known as A. G. Fraser and Sandy Fraser, is a noted British American computer scientist.Fraser received his B.Sc. degree in Aeronautical Engineering from Bristol University in 1958, and his Ph.D. in Computing Science… …
