| 单词 | SNA (Systems Network Architecture) |
| 释义 | SNA (Systems Network Architecture) A five-level design architecture developed by IBM in 1974, SNA comprises software and hardware interfaces that permit various IBM systems and software to communicate. SNA that has grown into a seven-layer model that more closely corresponds to the OSI Reference Model, an internationally recognized open model, although the two remain incompatible. SNA includes network nodes, physical units, and logical units , defined as follows: • Nodes: Physical devices including computers, communications processors (e.g., FEPs), terminal controllers, and terminals. • Physical units (PUs): Physical devices that manage the communications hardware and software, participating in the controlling and routing of network communications. • Logical units (LUs): Programs that manage communications software for communications with end users. A logical unit session is an end-to-end communication between an end-user terminal and the originating application residing in the host. See also hardware, network architecture, OSI Reference Model, and software. |
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