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Gateway
(Page 4 of 4)
SNA Gateway
The SNA (Systems Network Architecture)
gateway allow PC based transport protocols such as IPX,
NetBEUI, or TCP/IP to ‘talk’ to
the IBM SNA protocol found on mid and large
range IBM systems. This protocol is proprietary and not
compatible with the OSI model. SNA operates on a similar
7 layer design with layers 1-7 being, physical, data
link, path control, transmission, data flow,
presentation, and transaction layer. The hardware gateways
use the SDLC (synchronous data ink control) protocol. Because
converting between SNA/SDLC and other protocols requires translation
at many layers in the communication sequence, SNA gateways can be
said to operate at Layer 7 and at lower layers as well.
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