Visara FEP-4600 Planning Guide - Manual (Page 70)

Chapter 6. Support of PU 4 Connections
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Subarea Assignments on the FEP-4600
As a PU4 gateway platform, the FEP-4600 is capable of appearing as one or more
subareas depending on perspective. Each PU4 link is configured for the subarea that it is
to represent to the link partner. In some cases you will want to configure the same
subarea for each link, but this usually is not the case. For the simplest of networks (one
PU4 link), the FEP-4600 may be configured to take over the subarea assignment that was
previously assigned to the 37x5 it is replacing. It is usually better however to assign a
new subarea to the FEP-4600 so that testing can be conducted easier. When more than
one PU4 link exists you may want to assign additional subareas to the platform, but you
can also assign different TGs to each of the links and use just a single subarea to
represent the FEP-4600. Below, you will find a number of scenarios.
Scenario 1: Simple Replacement
In this first scenario, the FEP-4600 is providing a simple replacement for a 3745 that was
providing a single PU4 connection to a remote 3745. To keep things simple, the same
subarea previously used for the 3745 is now used by the FEP-4600. Note that there are
still gen changes required on the local VTAM since the FEP-4600 appears as a SCTC
link and an adjacent VTAM, not a 3745.
VTAM
SA03
NCP
SA04
Before
CPU 3745 3745 CPU
NCP
SA14
VTAM
SA10
VTAM
SA03
Appears
as
SA04
to both
links
After
CPU FEP-4600 3745 CPU
NCP
SA14
VTAM
SA10