TM 5-691, TECHNICAL MANUAL: UTILITY SYSTEMS DESIGN REQUIREMENTS FOR COMMAND, CONTROL, COMMUNICATIONS, COMPUTER, INTELLIGENCE, SURVEILLANCE, AND RECONNAISSANCE (C4ISR) FACILITIES (27-DEC-2006)

TM 5-691, TECHNICAL MANUAL: UTILITY SYSTEMS DESIGN REQUIREMENTS FOR COMMAND, CONTROL, COMMUNICATIONS, COMPUTER, INTELLIGENCE, SURVEILLANCE, AND RECONNAISSANCE (C4ISR) FACILITIES (27-DEC-2006)., This manual establishes minimum requirements and design objectives for utility systems supporting major fixed Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) facilities. The existence of the manual does not, in itself, authorize upgrade or modifications of existing C4ISR facilities solely to meet these requirements. Facilities required to fully comply with the provisions of the manual will be designated by the Joint Chiefs of Staff, a Military Department Headquarters, or a Major Command. This manual shall be used in the engineering design, fabrication, and installation of specifically designated fixed ground-based facilities in a threat-hardened C4ISR network. Minimum performance requirements are prescribed for the design of highly reliable utility systems that will permit C4ISR operation free from man-made threats. This manual applies to both new construction and to retrofit of existing facilities. Use of the manual for threat protection of other ground-based communications- electronics facilities that require high reliability is also encouraged. There are three basic sizes of C4ISR installations for which the requirements of this manual are applicable.