store-and-forward switching system
21Ethernet — An 8P8C modular connector (often called RJ45) commonly used on cat 5 cables in Ethernet networks Ethernet   …
22ARPANET — For the producer, see Gerald Donald. ARPANET logical map, March 1977 The Advanced Research Projects Agency Network (ARPANET), was the world s first operational packet switching network and the core network of a set that came to compose the global …
23Society for Worldwide Interbank Financial Telecommunication — The Society for Worldwide Interbank Financial Telecommunication ( SWIFT ) operates a worldwide financial messaging network. Messages are securely and reliably exchanged between banks and other financial institutions. SWIFT also markets software… …
24Direct 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… …
25Distress radiobeacon — PLB redirects here. For other uses, see PLB (disambiguation). Emergency position indicating radio beacons or EPIRBs Distress radio beacons, also known as emergency beacons, ELT or EPIRB, are tracking transmitters which aid in the detection and… …
26Communications satellite — A communications satellite (sometimes abbreviated to COMSAT) is an artificial satellite stationed in space for the purpose of telecommunications. Modern communications satellites use a variety of orbits including geostationary orbits, Molniya… …
27Layer-3 Switch — 7 7 6 6 5 …
28Layer-4-Switch — 7 7 6 6 5 …
29Layer-7-Switch — 7 7 6 6 5 …
30Multilayer Switch — 7 7 6 6 5 …
