The Lightweight Directory Access Protocol (LDAP) is an application protocol for accessing and maintaining distributed directory information services over an Internet Protocol (IP) network. LDAP enables OrionLX user passwords and privileges to be set up on an enterprise server – instead of in the OrionLX – to simplify password management. Note that before LDAP can be configured in the OrionLX, the System Security Services Daemon (SSSD) package must first be installed in the OrionLX. Because the SSSD package requires a large amount of internal OrionLX memory, the High Performance OrionLX CPU (-CPX) is recommended. The OrionLX interacts with the enterprise server when a remote substation user attempts access to an OrionLX in the substation.