In the context of classified DOD networks, Protected Distribution Systems (PDS) is a system of carriers (conduits,  ducts, etc.) that are used to distribute Military and National Security Information (NSI) between two or more controlled areas or from a  controlled area through an area of lesser classification (i.e., outside the SCIF or other similar area).

National Security Telecommunications and Information Systems Security  Instruction (NSTISSI) No. 7003, Protective Distribution Systems (PDS),  provides guidance for the protection of SIPRNET wireline and optical  fiber PDS to transmit unencrypted classified National  Security Information (NSI). SecurLAN is an approved and certified solution for the "Alarmed Carrier".

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