Hi,
on the standby site you only need to install an empty ASE database using the system copy option in sapinst. Here is an example for a 7.40 installation:
SAP Netweaver 7.4 Support Release 1 -> SAP ASE -> System Copy -> Target System -> Distributed System -> Based on AS ABAP -> Database Instance
In the end you will have one SAP ERP system which always automatically connects to the ASE database which is classified as the primary database.
Regards,
Joachim