Almost 95% of Internet links in Iran use TCP/IP. However IRANPAC also supports the following: X.75, X.25, X.3, (X.28, X.29), BSC, SNA/SDLC, ASYNCH and frame relay. Support of ports up to speeds of 28.8 kbps is provided. Additional support exists for 64 kbps-2 Mbps through leased lines. DCI has recently implemented a trial ATM network as well.