Sending information
Explore how information moved faster, farther and more reliably, from human carriers and signal towers to fibre optics, satellites and mobile networks. This pathway follows the main changes in chronological order and shows which older practices continued beside them.
How did messages outrun the messenger?
Five turning points
Long-distance acoustic and visual signals
Long-distance acoustic and visual signals is the point at which human communication begins to move faster than the human carrier. The topic teaches five enduring lessons.
Open topic →Optical telegraph and semaphore
The message advances because each station reproduces a visible state. No horse, runner or paper packet must traverse the full route.
Open topic →Telephone
Users do not need to compose a telegram or learn a signalling code. Misunderstandings can be corrected during the same interaction.
Open topic →Computer networks and ARPANET
Users can log into, transfer files to or invoke services on computers located elsewhere. The network connects machines with different hardware, operating systems and local conventions.
Open topic →Cellular Mobile Networks
The same frequencies can be reused in separated cells, allowing capacity to scale geographically rather than requiring one unique channel for every subscriber. Incoming and outgoing service can follow a subscriber rather than a fixed wall socket or office.
Open topic →Follow the history from beginning to present
Long-distance acoustic and visual signals
Long-distance acoustic and visual signals covers deliberately produced sounds, lights, smoke patterns, flags, gestures and related signals designed to carry information beyond ordinary conversational distance.
Couriers and messengers
A courier or messenger makes information mobile by carrying it through space.
Organised postal systems
An organised postal system transforms message delivery from a personal arrangement into a repeatable network service.
Optical telegraph and semaphore
Optical telegraphy transformed long-distance signalling from isolated alarms into a staffed, addressable and code-governed network.
Electrical telegraph
The electrical telegraph separated communication speed from both human transport and visibility.
Submarine telegraph cables
Submarine telegraph cables extended electrical communication across seas that overhead wires could not cross.
Telephone
The telephone changed long-distance communication from submitted text to live interaction.
Communications satellites
Communications satellites extend radio links beyond the terrestrial horizon by placing relay infrastructure above Earth.
Packet switching
Packet switching transmits digital traffic by dividing information into bounded units that carry control information and share network links with packets from other communications.
Computer networks and ARPANET
A computer network links independently operating computers so that processes and users can exchange data or use remote resources.
Internet and TCP/IP
The Internet is an operational federation of networks that communicate through the Internet Protocol and related standards.
Fibre-Optic Communication
Fibre-optic communication transmits information by modulating light guided through a dielectric fibre whose core and cladding create controlled propagation.
Cellular Mobile Networks
Cellular mobile networks are not merely telephone systems with radios attached.