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from article Telephone service
Elements of the local telephone network.
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from article Telephone service
National long-distance telephone network of the early 1980s, which introduced common-channel interoffice signaling (CCIS) to speed call completions, using 14 special packet switches called signal transfer points. Regional, sectional, primary, and…
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from article Telephone service
National long-distance telephone network of the early 1990s, which uses common-channel Signaling System 7 technology. Signal transfer points serve local switches as well as the long-distance network with out-of-band access to various data banks, and…
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from article Telephone service
Caller identification service in Signaling System 7, whereby call waiting identifies the caller's name and directory number for waiting calls. Broken lines indicate SS7 links. (AT&T)
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from article Telephone service
Virtual private network with international links that must involve service providers of both the United States and other countries. (AT&T)
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from article Computer-based systems
Model of a distributed computer-based system.
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from article Animal breeding
Specialized breeds of cattle have been developed and adapted to different environmental and economic conditions. Through breeding, the cattle have been modified with respect to one or more phenotypic traits (for example, the production of meat or…
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from article Animal breeding
Artificial insemination is a process often used by animal breeders. Through the use of this method, sperm collected from male animals can be deposited in female animal genitalia by instruments rather than by natural service. (Credit: alex-mit/Getty…
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from article Animal breeding
Dolly (the world's first cloned mammal) and her first-born lamb, Bonnie. (Credit: Roslin Institute)
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from article Radio receiver
Simple tuned-radio-frequency (TRF) receiver for amplitude-modulated (AM) signals.
