Hi there ,
I may be wrong but what i understood is Identity Manager helps in data
synchronisation from edirectory system to other systems only. as i see the
below words from connected systems document..

"Identity Manager is a data-sharing service that leverages eDirectory to
distribute new and updated information across designated directories and
applications on an enterprise network and partner system outside the
firewall."

Could you please clarify this . Is there any option to implement
"Database to eDirectory" data synchronisation please send me the relevant
documents or URL to download the documents.