Brixton TN3770 Open Client

The Brixton TN3770 Open Client architecture comprises several key components. The Client Application is the primary interface, handling user commands and file transfer operations. The Configuration Files store connection parameters, including the SNA Server address, LU name, and file transfer options.

The SNA Server Interface facilitates communication with the mainframe, translating SNA protocols. The client application initiates file transfers using the `submit` command, which packages the file and job control information and sends it to the SNA Server. The SNA Server then transmits the data to the mainframe via RJE.

File retrieval is handled by the `retrieve` command, which requests output from the mainframe. The client application receives the output from the SNA Server and saves it to the specified local file. The CLI provides commands for monitoring job status and managing the transfer process.

The client does not use a database for persistent storage; instead, it relies on system logs and the CLI for status information. Network requirements include connectivity to the SNA Server, typically over TCP/IP. The SNA Server must be configured to communicate with the mainframe.

The client application is written in C, and the configuration files are typically text-based.