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.