HP HP-UX SNAplus2, Administration Manual

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Chapter 2 75
Introduction to SNAplus2
SNAplus2 Components
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 function.
SNAplus2 implements an APPN node to communicate with other nodes
on the SNA network. This provides logical 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, RJE, and LUA communications.
SNAplus2 can operate either as a LEN node or as an APPN end node,
depending on its configuration. Certain functions are supported only on
end nodes, as defined by the APPN architecture. These differences are
indicated where necessary in this manual; where no differences are
indicated, the information applies to both node types.
Passthrough Services
Passthrough services enable downstream computers on a LAN to access
host resources through a server running SNAplus2. SNAplus2 provides
the following passthrough services:
• PU concentration (see “PU Concentration”).
• Dependent LU requester (see “Dependent LU Requester”).
• TN server (see “TN Server”).
• UNIX command facility (see “Remote Command Facility”).
PU Concentration.
In addition to providing direct access to a host
computer, SNAplus2 can provide PU concentration facilities. This
feature enables other computers to access a host computer through the
SNAplus2 node, instead of requiring a separate connection to the host
from each computer.
The PU concentration feature is shown in Figure 2-7, “PU
Concentration.”