
76 Chapter 2
Introduction to SNAplus2
SNAplus2 Components
Figure 2-7 PU Concentration
The downstream computer must contain an SNA PU type 2.0 or 2.1 to
support dependent LUs. For example, the downstream computer could be
a PC running Microsoft SNA Server for Windows NT, or another
SNAplus2 computer.
When the local SNAplus2 node uses the PU concentration feature, all the
data transferred between the host and the downstream computer is
routed through the local node. This enables a downstream computer to
share a host connection with SNAplus2 or with other downstream
computers, instead of requiring a direct link. For example, you could set
up several downstream computers connected to SNAplus2 over a local
token ring network, so that they could all access the same long-distance
leased line from SNAplus2 to the host.
Using PU concentration also simplifies the configuration at the host,
because you do not need to define the downstream computers and the
communication links to them. The host configuration needs to include
only the SNAplus2 computer and its host communication link; the LUs
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