EntityQ577764· pop 16· linked from 222 articlescommunications systemSign in to savecollection of systems used in telecommunicationsConnectionselectromagnetic radiationEntitysignalEntitywireless communicationEntityInformation AgeEntitytransmission mediumEntitycomputerEntityInternetEntitytelevisionEntityThomas EdisonEntitylightEntitytelephoneEntityNikola TeslaEntitycommunicationEntityradioEntitymobile phoneEntityjournalismEntityemailEntitymass mediaEntityTim Berners-LeeEntityAlexander Graham BellEntityCategoriesMilitary communicationsTechnology systemsTelecommunicationsTelecommunications systems