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The acronym DCN is often used in connection with the term “Internet2”. ### Technical functionality of DCN DCN assigns bandwidths and transmits data via fiber optics in the internet infrastructure. However, the connection between the communication partners and the network nodes uses optical frequencies. The [routers](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/router) to be connected between the transmitting and the receiving subscriber require special software to establish DCN connections. The DCN connections are comparable with connections in a classic, circuit-switched network such as the telephone network. Information can be transmitted from one subscriber to the other without being affected or throttled by the activities of other subscribers. Unlike the traditional telephone network, very high bandwidths can be achieved in a Dynamic Circuit Network. As a result, large amounts of information can be transmitted in a continuous data stream without loss and extremely quickly. The user or the application sends a connection request to the DCN Control Plane to establish a DCN connection. The Control Plane handles authorization, bandwidth reservation, establishing the connection and closing the connection. If the connection needs to be established via multiple domains, this is coordinated by the international IDC protocol. The actual connection consists of a dedicated, virtual point-to-point VLAN. ### Application of the Dynamic Circuit Network DCN is often used in medicine and research. These fields often require large bandwidths with guaranteed qualities of service to exchange large amounts of information. Dynamic Circuit Network technology ensures that real-time applications requiring a high bandwidth can also be used over long distances. Many American universities and research institutes are connected via DCN. 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