Introduction to SNA Capabilities of Tandem NonStop Systems

Putting It All Together
Introduction to SNA Capabilities of Tandem NonStop Systems–134597
5-3
Automated Teller Machine Network Using SNAX/XF
In this example, the user takes advantage of all the capabilities of SNAX/XF:
application-to-device communication, session passthrough, and application-to-
application communication.
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The Tandem ATM application uses SNAX/XF Tandem application-to-SNA device
communication to manage the ATM terminals. These terminals are SNA devices
attached to NonStop systems. The NonStop systems provide all the benefits that
Tandem normally brings to an OLTP application.
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The initial menu presented to ATM users by the Tandem ATM application includes
an option to make a mortgage payment to the bank by transferring funds from a
checking or savings account. However, the application that accepts mortgage
payments and adjusts mortgage balances is an SNA host application that runs on
IBM system A. When the Tandem application receives the user's request to make a
mortgage payment, it passes control transparently to the SNA host application. The
SNA host application then takes over control of the ATM terminal and processes the
mortgage payment. This communication between the SNA host and the ATM
terminal is a case of SNAX/XF session passthrough because an SNA host
application is communicating with an SNA device attached to a NonStop system.
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The Tandem ATM application on each NonStop system maintains a log file of each
day's transactions so that it can transmit this data at the end of the day to an ATM
activity-analysis application running on IBM system B. This SNA host application
stores the transaction data sent by the NonStop systems in a database and uses the
information to print operations reports showing how much the bank's customers are
using the ATM terminals, how often they are executing particular types of
transactions, and how much cash the ATM terminals are dispensing each day. The
Tandem application uses SNAX/XF application-to-application communications to
transmit each day's transaction data to the ATM activity-analysis application.