Protected distribution system

Protected distribution system

A Protected distribution system (PDS) is a wireline or fiber-optics telecommunication system that includes terminals and adequate acoustical, electrical, electromagnetic, and physical safeguards to permit its use for the unencrypted transmission of classified information.

"Note:" A complete protected distribution system includes the subscriber and terminal equipment and the interconnecting lines. "Deprecated synonym" - "approved circuit".

Source: from Federal Standard 1037C and from the National Information Systems Security Glossary


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