In a fibre-optic backboneBackbone This term refers to a very high-speed network that connects other networks. For example, the Open Fiber backbone connects the cities covered by the service. Another example are Internet backbones that connect national networks and allow users in each country to see any site located in another part of the world., in order to improve the use of optical resources and increase data transmission speed, the total capacity is divided into a number of adjacent channels, each capable of transporting from 10 Gigabits to 40 Gigabits, up to a maximum of 100 Gigabits. This approach is referred to as Fixed-Grid. In a networkNetwork In computer language, the term network defines a set of hardware and software devices which, when linked together, enable the exchange and sharing of resources, data or information. In a computer network, the devices that generate, route and terminate data are called network nodes. with Flex-Grid technology, adjacent channels can be combined to achieve arbitrary transmission capacities of up to 1 Terabit. This makes it possible to dynamically increase the capacity of the backbone based on end-user bandwidth demand.