Deployment topologies

CICS® Transaction Gateway can be deployed in a local mode (two-tier) topology or a remote mode (three-tier) topology. Each topology provides different qualities of service.

Remote mode
The client application and CICS Transaction Gateway can be on different machines and the Gateway daemon listens on a specific port for incoming client requests. The Gateway daemon runs as a standalone process, handles the management of connections and threads, and forwards client requests to CICS.
Local mode
In local mode, the client application is installed and runs on the CICS Transaction Gateway host machine and sends requests directly to CICS without using the Gateway daemon.
Connectivity to CICS
There is a choice of network protocols for connecting to CICS.

Parent topic: Overview

Related concepts

Configuring CICS server connections
Configuring CICS server connections

Related information

Configuring EXCI
Configuring EXCI
Which protocol can be used?