ExpressConnect for Oracle (ECO), a component of Replication Server Options, provides direct communication between a Replication Server and a replicate Oracle data server. ECO has replaced the ECDA Option for Oracle in Replication Server Options 15.5.
You can use ECO if you have a licensed Replication Server and have purchased Replication Server Options for Oracle. If you have upgraded Replication Server to version 15.6, you must install ECO 15.5 ESD #1, which is included in Replication Server Options for Oracle 15.6.
See ExpressConnect for Oracle Installation and Configuration Guide.