Competitors
The proprietary networking architecture for Honeywell Bull mainframes is Distributed Systems Architecture (DSA). Communications package for DSA is VIP. Like SNA, DSA is also no longer supported for client access. Bull mainframes are fitted with Mainway for translating DSA to TCP/IP and VIP devices are replaced by TNVIP Terminal Emulations (GLink, Winsurf). GCOS 8 supports TNVIP SE over TCP/IP. Other architectures are Unisys – formerly Univac – Distributed Computing Architecture (DCA) and – formerly Burroughs – Burroughs Network Architecture (BNA), both largely obsolete by 2012.
Read more about this topic: IBM Systems Network Architecture