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AST RESEARCH TECHNICAL BULLETIN TB-0207A 09/18/86
SNA/BSC STAND ALONE / GATEWAY CLUSTER
The purpose of this Technical Bulletin is to avoid difficulties
when using AST SNA and AST BSC stand alone and their Cluster or
Gateway counterparts.
When using SNA and BSC and their Cluster or Gateway counterparts,
the user may experience the following symptom: the Gateway or
Cluster has only one terminal or LU active. The intended sign on
screen does appear on this terminal. However, the other
terminals are not active. They do not have the intended sign on
screen.
This symptom will occur under the following conditions:
1) The user has dialed into the host with the SNA
or BSC stand alone package.
2) The user then tries to dial into the same line
using the Cluster or Gateway with more than
one terminal (or LU) defined in the AST
configuration file.
The following is an explanation of why this symptom occurs. When
the user of the SNA or BSC stand alone package dials into the
mainframe, the mainframe activates the terminal (LU). The
mainframe then polls for all other terminals (LUs) on the
controller. These LUs are not defined in the AST-SNA or BSC
stand alone packages. The mainframe receives an indication from
AST SNA or BSC that these LUs are not defined, and therefore
deactivates them.
To solve this problem, the mainframe systems operator needs to
activate all LUs on the controller before the Cluster or Gateway
users call in.
This symptom and explanation applies to all other brands of 3270
terminals and emulators under the conditions described above.