Hi lubyou,
Thank you for using the forum.
I would suggest that you look at the following solution:
This solution looks like it might be what you are looking for or close.
Solution : Configure Network Authentication Using LDAP / LDAPS
http://www.support.xerox.com/support/CQ930X/support/en_US.html?objGUID=2387
If this doesn't help, you may consider contacting Xerox consulting at the following link:
http://www.xerox.com/about-xerox/customer-training/enus.html#content
or Contact an experienced service technician using our Fast Track to the Expert