Telecommunication, Describes history of telecommunication from Telegraph to LAN's

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…second as well as 1.544 megabits per second. Another type of LAN to LAN connections are packet switching networks. These are services that a network router calls up on a digital line. They consist of a group of packet switches that are connected via intraswitch trunks (usually fiber optic) that relay addressed packets of information between them. Once the packet reaches the destination packet switch, it sends it via another digital connection to the receiving router.