ExpressConnect for Oracle (ECO), a component of the Replication Server Option for Oracle, provides direct communication between a Replication Server and a replicate data server.
ECO is installed automatically with Replication Server 15.7.1 ESD #1 or later. A static license is included with the Replication Server Option for Oracle. You can use ECO if you have a licensed Replication Server and have purchased the Replication Server Option for Oracle.
See the ExpressConnect for Oracle Configuration Guide.