In that period, the role that SRCE performed for a full 17 years (from 1992 to 2009) is certainly the most significant, and probably the most well-known to today's generation - the role of the network operating center of the CARNET network, whereby we can single out three periods/phases that (technologically ) marked the Heart of the NOC (Network Operations Center). These are: the initial phase of the Internet in Croatia from 1991 to 1995, when CARNET was launched as a project, the ATM phase of the CARNet network from 1995 to 2003, and the (Gigabit) Ethernet CARNet phase until 2009.