four-wire separate connection
21Two-phase electric power — Two phase electrical power was an early 20th century polyphase alternating current electric power distribution system. Two circuits were used, with voltage phases differing by 90 degrees. Usually circuits used four wires, two for each phase. Less …
22List of electronics topics — Alphabetization has been neglected in some parts of this article (the b section in particular). You can help by editing it. This is a list of communications, computers, electronic circuits, fiberoptics, microelectronics, medical electronics,… …
23Time-division multiplexing — (TDM) is a type of digital or (rarely) analog multiplexing in which two or more signals or bit streams are transferred apparently simultaneously as sub channels in one communication channel, but are physically taking turns on the channel. The… …
24line — line1 W1S1 [laın] n ▬▬▬▬▬▬▬ 1¦(on paper/on the ground)¦ 2¦(between two areas)¦ 3¦(of people/things)¦ 4¦(direction)¦ 5¦(on your face)¦ 6¦(phone)¦ 7¦(for trains)¦ 8¦(between two types of thing)¦ 9¦(shape/edge)¦ 10¦(w …
25Direct distance dialing — (DDD) or direct dial is a telecommunications term for a network provided service feature in which a call originator may, without operator assistance, call any other user outside the local calling area. DDD requires more digits in the number… …
26Duplex (telecommunications) — A duplex communication system is a system composed of two connected parties or devices that can communicate with one another in both directions. The term multiplexing is used when describing communication between more than two parties or devices …
27Highgate Wood Telephone Exchange — Highgate Wood is a suburb in North London that was chosen as the site of a trial for an electronic telephone exchange built by members from Joint Electronic Research Council (JERC), which was formed in 1956 and consisted of the British Post… …
28Computers and Information Systems — ▪ 2009 Introduction Smartphone: The New Computer. The market for the smartphone in reality a handheld computer for Web browsing, e mail, music, and video that was integrated with a cellular telephone continued to grow in 2008. According to… …
29arts, East Asian — Introduction music and visual and performing arts of China, Korea, and Japan. The literatures of these countries are covered in the articles Chinese literature, Korean literature, and Japanese literature. Some studies of East Asia… …
30Maxwell's equations — For thermodynamic relations, see Maxwell relations. Electromagnetism …
