Create ODBC data sources on the PowerCenter Client and PowerCenter Integration Service machines.
On the PowerCenter Client machine, create ODBC data sources so that PowerCenter can import the metadata for PowerExchange sources and targets and you can preview data from PowerCenter.
On the machine that runs the PowerCenter Integration Service, create ODBC data sources so that PowerCenter workflows can connect to the PowerExchange Listener and extract data for PowerExchange sources or targets.