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SNA vs TCP/IP

Posted on 2007-12-05
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Why is TCP/IP better than SNA??
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Question by:wzimmerl
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    * Localization of problems in the telecommunications network was easier because a relatively small amount of software actually dealt with communication links. There was a single error reporting system.
    * Adding communication capability to an application program was much easier because the formidable area of link control software that typically requires interrupt processors and software timers was relegated to system software and NCP.


see: http://en.wikipedia.org/wiki/Systems_Network_Architecture
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that was the advantages of SNA... here are the disadvantages (the price was one):

    * Connection to non-SNA networks was difficult. An application which needed access to some communication scheme, which was not supported in the current version of SNA, faced obstacles. Before IBM included X.25 support (NPSI) in SNA, connecting to an X.25 network would have been awkward. Conversion between X.25 and SNA protocols could have been provided either by NCP software modifications or by an external protocol converter.

    * SNA network installation is complicated and SNA network products are (or were) expensive. Attempts to reduce SNA network complexity by adding IBM Advanced Peer-to-Peer Networking functionality were not really successful, if only because the migration from traditional SNA to SNA/APPN was very complex, without providing much additional value, at least initially. SNA software licences (VTAM) cost as much as $10000 a month for high-end systems. And SNA IBM 3745 Communications Controllers typically costed over $100K. TCP/IP was still seen as a toy for scientists and unfit for professional applications e.g. in the finance industry until the late 1980s, but rapidly took over in the 1990s due to its elegance and its lower cost. When the price of SNA products was lowered too, it was too late.
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