Global network

A global network is any communication network that spans the entire Earth. It usually means a system that allows two-way communication using modern technology. While older ways of sharing information, like international mail, radio, and television, exist, they are not considered global networks in this sense because they do not allow communication in both directions.

The very first global network was created using electrical telegraphy, and it covered the whole world by 1899. The telephony network became global in the 1950s. Today, the biggest global networks are the Internet, which had about 2.5 billion users in 2014, and the mobile communication network, used by over 6 billion people worldwide the same year.

Building a global network takes many years and a lot of money. It needs special equipment like switching and routing devices, long cables laid under the ocean and on land, and stations that connect to earth stations. Countries also need to agree on rules and standards for how to send information to each other.

Sometimes, people also talk about global networks of people, like groups of scientists, cities, or civil organizations working together to solve important problems around the world, known as global issues.

Satellite global networks

Communication satellites play a big role in global networks. Special groups of satellites, like Iridium, Globalstar, and Orbcomm, orbit the Earth in what is called low Earth orbit. These satellites are arranged in patterns and work together in a mesh network, sharing information with each other. With VSAT technology, people can now get satellite internet access almost anywhere in the world.

Mobile wireless networks

Most of the world's mobile phones use a standard called GSM, which works in over 212 countries and territories. This makes it easy for people to use their phones when they travel to different countries, a feature known as international roaming. For this to work, mobile networks need to connect with each other through special agreements, which helps create a worldwide network.

Network interconnection

Global networks today connect through different types of communication systems. For example, voice calls and internet data can travel together using technology like voice over IP (VoIP), and mobile phones can handle both calls and internet services. These networks link up with satellite systems as well.

The main connections for these digital networks use special cables made of glass fibers, called fiber-optic cables, which can carry massive amounts of information across the world.

Social and economic impact

The Canadian sociologist Marshall McLuhan was the first to predict how global networks would change society, calling it the global village. His ideas focused on radio and television, which came before the internet.

Global networks have changed how people communicate many times. The electrical telegraph was a major change, sometimes called the Victorian Internet. Later, technologies like radiotelegraphy and telex expanded these networks. Today, the Internet and mobile networks allow new ways for people to interact, organize, and communicate instantly, having a huge social impact. These networks have also influenced how governments work around the world.