The figure shows the major entities involved in RMAN transportable tablespace from backup:
The source database, with RMAN-usable backups and archived redo logs
The RMAN client, connected to the source database
The auxiliary instance created by RMAN for use in creating the transportable tablespace set
The auxiliary destination, where the output files for the auxiliary instance that are not part of the transportable set are stored
The tablespace destination, where the datafiles and Data Pump Export dump file are written, along with a sample import script
The part played by each of these entities is described in the text which follows.