The IBM z/Transaction Processing Facility (z/TPF) system is a high availability operating system designed to provide quick response times to high volumes of messages from large networks of terminals and workstations.

z/TPF was once known as the Airline Control Program (ACP). It is still used by airlines and has been extended for other large systems with high-speed, high-volume transaction processing requirements.

A typical z/TPF system handles several hundred messages per second. A typical network varies from several hundred terminals and workstations to tens of thousands.

The response time of the z/TPF system within a network is typically less than three seconds from the time that the user sends a message to the time the user receives a response to that message. High availability is enhanced by the ability to quickly restart the system; restarting after a system failure takes between 30 seconds and two minutes.

Benefits

• **Consistent speed: **High throughput while maintaining fast, consistent responses, even during unpredictable transaction peaks. 
• **High availability: **Centralized, consistent, secure and highly available database processing allowing for 24-hour, 7-day a week operation.
• **Hybrid cloud connection: **z/TPF connects to other parts of your hybrid multi-cloud architecture by using industry-standard methods for both core services and data, including REST, HTTP, MQ, MongoDB and Kafka.
• **Cost efficient: **Lowest cost per transaction with efficient use of resources, such as main storage and file storage.
• **Open-ended capacity growth: **Allows for coupling as many as 32 multiprocessor z/Architecture® configurations with only a minimal increase in system overhead and expandable database capacity by adding DASD.
• **Secure system: **z/TPF supports pervasive encryption, allowing you to protect data flowing across the network, stored on disk and cached in memory, by using hardware-accelerated strong cipher suites.