digital switching company
31Class 4 telephone switch — A Class 4, or Tandem, telephone switch is a U.S. telephone company central office telephone exchange used to interconnect local exchange carrier offices for long distance communications in the Public Switched Telephone Network. A Class 4 switch… …
32Alcatel-Lucent — S.A. Type Société Anonyme Traded as Euronext:  …
33System X (telephony) — System X was the name of the UK s first national digital telephone exchange system.HistorySystem X was developed by the UK Post Office (later to become British Telecom), GEC, Plessey, and Standard Telephones and Cables (STC), and first shown in… …
34Computer Consoles Inc. — Computer Consoles Inc. or CCI was a telephony and computer company located in Rochester, New York, USA, which did business first as a private, and then ultimately a public company from 1968 to 1990. CCI provided worldwide telephone companies with …
35EWSD — ( Elektronisches Wählsystem Digital in German, Electronic Digital Switching System/Electronic World Switch Digital [ [http://www.dmine.com/phworld/switch/otherm.htm Telephone World Other Modern Switching Systems of Note ] ] in English) is one of… …
36Public 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 …
37Phreaking — is a slang term coined to describe the activity of a subculture of people who study, experiment with, or explore telecommunication systems, like equipment and systems connected to public telephone networks. The term phreak is a portmanteau of the …
38MOSFET — Two power MOSFETs in the surface mount package D2PAK. Operating as switches, each of these components can sustain a blocking voltage of 120 volts in the OFF state, and can conduct a continuous current of 30 amperes in the ON state, dissipating up …
39List of telephone switches — This is intended to be a list of the more common central office (telephone company operated) telephone switches. This list is nowhere near complete. Many British and non North American switches are missing.AGCS*GTD 5 EAXAlcatel*E10 Five *E10B… …
40Telephone tapping — Wiretap redirects here. For the radio program, see WireTap (radio program). Telephone tapping (also wire tapping or wiretapping in American English) is the monitoring of telephone and Internet conversations by a third party, often by covert means …
