APPC Subsystem on MPE/XL Node Manager's Guide (30294-90007)

24 Chapter1
Introduction
The APPC Subsystem
conduct sessions with LUs on two different nodes, because both nodes
are connected to the HP 3000 through the same copy of SNA/SDLC
Link/XL.
AS/400 #2 is directly connected to the HP 3000. It is configured as a
Network Node, so it can route sessions from the HP 3000 to AS/400 #3,
which is not directly connected to the HP 3000.
Dependent LU DEPLUA on the HP 3000 is conducting one session with
dependent LU HOSTLU on the IBM host. Because it is a dependent LU, it
can conduct only one session at a time. Every APPC session with a
remote dependent LU requires one local dependent LU on the HP 3000.
NOTE The HP 3000 does not have primary SDLC link capability, so it cannot
activate the link to the remote system.