The Incas didn't have a written script but used a complicated system of knotted cords called, 'Quipu' for communicating.
A system of sea, river and road transport.
A. Radziminski has written: 'Networking communication operating system (NCOS)'
One was the introduction of Aramaic as the common language of the Empire, which facilitated communication between the varied peoples of the Empire. Jesus of Nazareth over 500 years later would have spoken his message in Aramaic. The Persians also built a system of roads which, in conjunction with sea transport, provided physical communication for contact and trade.
It established sea and river communications, and a road system for internal couriers and traffic.
Cain Garrett has written: 'A spread spectrum communication system'
As the Roman Empire declined, its famous road system suffered. Roads gradually broke down because they were not maintained. What was a major effect of this? Communication in the empire became less reliable.
There were two means - coastal ships and a post-horse courier system in land areas.
Michael Charlton has written: 'Media Communication in Everyday Life' 'Eagle and the Small Birds: Crisis in the Soviet Empire'
Sea transport and a system of tracks with way stations for mounted couriers.
building a complex road system to aid in communication and control World history student
Ships around the coast and in the rivers, seas and lakes, and a horse-relay courier system by land.
Ships in the coastal areas, and courier tracks in the inland areas.