tAlfred VailThomas A. WatsonCharles WheatstoneVladimir K. ZworykinTransmissionmediaCoaxial cableFiber-optic communicationoptical fiberFree-space optical communicationMolecular communicationRadio waveswirelessTransmission linedata transmission circuittelecommunication circuitNetwork topologyand switchingBandwidthLinksNodesterminalNetwork switchingcircuitpacketTelephone exchangeMultiplexingSpace-divisionFrequency-divisionTime-divisionPolarization-divisionOrbital angular-momentumCode-divisionConceptsCommunication protocolComputer networkData transmissionStore and forwardTelecommunications equipmentTypes of networkCellular networkEthernetISDNLANMobileNGNPublic Switched TelephoneRadioTelevisionTelexUUCPWANWireless networkNotable networksARPANETBITNETCYCLADESFidoNetInternetInternet2JANETNPL networkToasternetUsenetLocationsAfricaAmericasNorthSouthAntarcticaAsiaEuropeOceania(Global telecommunications regulation bodies) T