The Government of the Republic of Croatia established the Croatian Academic and Research Network – CARNet – in 1995 as an institution whose basic activities are network development, building and maintenance.
CARNet network is a private network of Croatian academic, scientific and research community, as well as of institutions of elementary and high school educational system. The network infrastructure is owned by CARNet institution, but cables are rented from various telecommunication providers. CARNet network is an example of a WAN network (Wide Area Network – a network distributed over large distances), which enables CARNet members throughout Croatia to connect into a compact information and communication system.
CARNet network is a data network whose principal purpose is to transfer data through TCP/IP protocol (Transport Control Protocol/Internet protocol). This protocol is an agreed standard for the currently most widespread computer network - Internet. The currently supported version of TCP/IP protocol on most of Internet, as well as CARNet network as its integral part, is version 4 (IPv4).
The key characteristic of every private network is its connection to the global network - Internet. CARNet network established this connection through the pan-European research network GEANT, at the current connection speed of 20 Gbps. GEANT network is a result of a European Union initiative, as well as initiatives of other European academic networks, to establish technologically most developed computer network which would connect all European national academic and research networks, as well as to establish a connection towards the so-called commercial Internet.
Connection to other Internet providers in Croatia has been implemented through the Croatian Internet Exchange Point – CIX.
In Croatia, CARNet network connects major Croatian towns on land and a number of settlements on the islands. Larger university centres (Dubrovnik, Osijek, Pula, Rijeka, Split, Zadar, Zagreb) have high speed connections (ranging from 155 Mbps to 1 Gbps), while smaller centres are connected at the speed ranging from 2 Mbps to 100 Mbps. Zagreb has a particularly advanced infrastructure (see image), connecting larger faculties and scientific institutions at the speeds of up to 10 Gbps. CARNet connected the locations of CARNet member institutions in Split to CARNet network by its own optical infrastructure developed in the project e-Split, in cooperation with The City of Split.
Furthermore, as part of the "Net in School" project, institutions from elementary and high school educational system are connected to CARNet network via ADSL connections. More about the project "Net in School" can be read here.
Besides, a number of schools on Croatian islands are now connected to CARNet network within the e-Islands project.
Technologically, the network includes several types of transfer lines (copper, optical and wireless connection) and several types of transfer technologies.