Visara FEP-4600 Planning Guide - Manual (Page 82)

Chapter 7. NULL SNI Networks
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At the data connection level, a more accurate representation of what appears at the
ESCON channel interface is shown below.
As viewed from the ESCON side, the FEP-4600 appears to the gateway VTAM in SA03
to be an adjacent subarea (SA05) on NET1 with the name of FEP4600 (this name is
defined in the FEP-4600 configuration and coded in the VTAM CDRM table). PATH
statements related to the new subarea will need to be created, in all VTAMs residing on
the local network that would need to be able to establish a CDRM-CDRM session for
locating resources. References to NET2 disappear and all resources previously available
on NET2 appear to be in the new subarea SA05 (CDRSC definitions can be left alone or
changed to the new subarea). The FEP-4600 will automatically forward requests for those
resources across the SNI boundary with the proper NETID included.
From the foreign network NCP side, the FEP-4600 appears as a front end processor using
subarea 98 on the network NULL. The remote network continues to view the connection
as an SNI null network connection, with no apparent changes over what previously
existed.
PROD1
VTAM
SA01
PROD2
VTAM
SA02
PROD3
VTAM
SA03
CPU
Viewed from the ESCON Side
Fep-4600
FEP4600
VTAM
SA05
CTC CTC TGN=2
NET1