Google Apps Directory Sync Administration Guide - Manual (Page 81)

Configuration 81
Password Attribute An LDAP attribute that contains each user’s
password. If you set this attribute, your users’
Google Apps passwords will be synchronized
to match their LDAP passwords.
The password field supports string or binary
attributes.
Example: CustomPassword1
Password Timestamp
Attribute An LDAP attribute that contains a timestamp
indicating the last time a user’s password was
changed. Your LDAP server updates this
attribute whenever a user changes their
password.
Use this field only if you select the Only
changed passwords option for the
Synchronize Passwords field.
This field supports string attributes.
Example: PasswordChangedTime
LDAP Extended Attribute
Setting
Description