Each of these nodes operates as a NOC for a part of the territory of Yugoslavia and their staff is a part of the AMREJ team. Belgrade University Computing Center operates as the NOC for both University of Belgrade and University of Arts in Belgrade. These nodes of concentration have numerous leased lines connecting faculties, research and development institutes and some secondary schools. These local connections vary from 1 Gbps to 10 Mbps lines through fibre optics, 2 Mbps to 128 kbps and 64 kbps through copper (HDSL, MSDSL, etc), even to 33 kbps. University of Belgrade has a 1 Gbps backbone with 4 nodes that is 20 km long. Universities of Novi Sad and Nis are now establishing their central gigabit nodes. At present, more than 150 educational and research institutions are connected to AMREJ.
AMREJ has more than 200 dial up ports in most of the towns for PPP-based remote access for organizations from the research and educational area, which cannot afford a leased line, and for individuals working in the research and development institutions. Connection via public X.25 network or ISDN is also possible.
We estimate that there are altogether more than 100.000 individuals connected to AMREJ network that use AMREJ services in Yugoslavia, most of them through the permanent infrastructure. Individuals from research and educational institutions can get a personal dial-up account directly from AMREJ.
International connectivity - AMREJ has a 2 Mb/s line to GRNET and through that node to the GEANT network. It also has a 1.5 Mb/s link to a commercial provider in Yugoslavia. These connections are overloaded even after midnight (The GRNET connection is visible through http://amrej.rcub.bg.ac.yu/mrtg/cisco-bgp.rcub.bg.ac.yu.5.html). Some basic services (FTP for example) are available only from midnight to early in the morning, in order to make other basic services available during the day.