HP-UX SNAplus2 R7 Administration Guide

Introduction to SNAplus2
SNAplus2 Components
Figure 2–6 Components of SNAplus2
LU Services
Transaction
Programs
Emulation
Programs
APIs
User Space
Kernel
User
Applications
Administration
Facilities
Local
Node
Link Protocols
LU 0
LU 1, 2, 3 LU 6.2
Communication with
Host and Peer Computers
The local node—including its associated connectivity resources (DLCs, ports, and link stations)—is implemented
as a set of STREAMS components in the kernel of the HP-UX system.
The 3270 emulation program, RJE workstation, APPC transaction programs, CPI-C applications, LUA applications,
and the remote command facility (RCF) are user-space programs. SNAplus2 supports multiple copies of the
3270 and 5250 emulation programs, and multiple APPC TPs, CPI-C applications, and LUA applications running
concurrently.
2.3.1 Node Components
A server running SNAplus2 implements an SNA node. It can also provide passthrough services between an SNA
host and computers in an APPN or TCP/IP network.
SNA Support
SNAplus2 provides SNA node type 2.0 and 2.1 (LEN node) support for communicating with host and peer computers;
it also implements an APPN node, providing end node, branch network node, or network node function according
to its configuration.
SNAplus2 implements an APPN node to communicate with other nodes on the SNA network. This provides logi-
cal unit (LU) 6.2 support for APPC and CPI-C capabilities and for 5250 emulation, in addition to LU 0, 1, 2, and
3 support for 3270, RJEand LUA communications.
SNAplus2can operate as any of the APPN node types (LEN, end, network, or branch network node), depending on
its configuration. Certain functions are supported only on particular node types, as defined by the APPN architecture.
These differences are indicated where necessary in this manual; where no differences are indicated, the information
applies to all node types.
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