Tandem Capacity Model (TCM) Manual

Non-ATM transaction is a transaction in which a bank customer performs an ATM function on an
ATM that belongs to another bank. The Foreign transaction is a transaction in which another bank’s
customer performs an ATM function on an ATM.
Transactions enter the system at either the Device Handler or the Gateway Interface. A Router
sends all transactions to Authorization. From Authorization, they return to the Router and are sent
to Host Interface or Gateway Interface. In either case, they return to Router, visit Authorization
again, are routed back to the point of entry, and depart from the system. Figure 21 (page 84)
shows a process flow diagram for this application.
Figure 21 Process Flow Diagram for a Non-Pathway Application
In Figure 22 (page 84), arrows indicate one Send and one Receive in each direction except for
the arrows from the Router to the Authorization. These arrows (for all three transactions) indicate
two Sends and two Receives in each direction.
Figure 22 Exact Paths for All Transactions
ATM: Device Handler → Router → Authorization → Router → Host
Interface → Router → Authorization → Router → Device Handler
Non-ATM: Gateway Interface → Router → Authorization → Router
→ Host Interface → Router → Authorization → Router → Gateway
Interface
Foreign: Device Handler → Router → Authorization → Router →
Gateway Interface → Router → Authorization → Router → Device
Handler
Performance data for all these categories is collected on an HP system using Measure and is
summarized using MeasTCM. An Other category contains everything else.
84 Creating a WA Model