ABT OUR RE CREATED SNA= SYNCHRONISED NUCLEIC ADVANCED FUNCTIONS OF COMPUTERS FOR COMMUNICATION. From Wikipedia, the free encyclopedia Systems Network Architecture (SNA) is IBMs proprietary networking architecture, created in 1974.[1] It is a complete protocol stack for interconnecting computers and their resources. SNA describes formats and protocols and is, in itself, not a piece of software. The implementation of SNA takes the form of various communications packages, most notably Virtual Telecommunications Access Method (VTAM), the mainframe package for SNA communications History[edit] SNA was made public as part of IBMs Advanced Function for Communications announcement in September, 1974, which included the implementation of the SNA/SDLC (Synchronous Data Link Control) protocols on new communications products: IBM 3767 communication terminal (printer) IBM 3770 data communication system They were supported by IBM 3704/3705 communication controllers and their Network Control Program, and by System/370 and their VTAM and other software such as CICS and IMS. This announcement was followed by another announcement in July, 1975, which introduced the IBM 3760 data entry station, the IBM 3790 communication system, and the new models of the IBM 3270 display system. SNA was mainly designed by the IBM Systems Development Division laboratory in Research Triangle Park, North Carolina, USA, helped by other laboratories that implemented SNA/SDLC. The details were later made public by IBMs System Reference Library manuals and IBM Systems Journal. SNA is still used extensively in banks and other financial transaction networks, as well as in many government agencies. While IBM is still providing support for SNA, one of the primary pieces of hardware, the 3745/3746 communications controller, has been withdrawn from the market by IBM. There are an estimated 20,000[when?] of these controllers installed however, and IBM continues to provide hardware maintenance service and microcode features to support users. A robust market of smaller companies continues to provide the 3745/3746, features, parts and service. VTAM is also supported by IBM, as is the IBM Network Control Program (NCP) required by the 3745/3746 controllers. In 2008 an IBM publication said: with the popularity and growth of TCP/IP, SNA is changing from being a true network architecture to being what could be termed an application and application access architecture. In other words, there are many applications that still need to communicate in SNA, but the required SNA protocols are carried over the network by
Posted on: Sat, 05 Jul 2014 09:50:26 +0000
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