FED-STD-1023

Abstract

This standard establishes interoperability requirements regarding the analog to digital conversion, encryption (with related synchronization), and modulation of encrypted voice associated with Frequency Modulation (FM) radio systems employing 25 kHz channels and operating above 30 MHz. In this standard, voice is digitized using 12 kbit/s Continuously Variable Slope Delta-modulation (CVSD) and then encrypted using a National Security Agency (NSA) Commercial COMSEC Endorsement Program (CCEP) Type I encryption algorithm. <br>This standard is to facilitate interoperability between telecommunication facilities and systems of the Federal Government. <br>This standard shall be used by all Federal departments and agencies in the design and procurement of digitized voice Type I encryption equipment for use with nominal 25 kHz channel FM radio systems that operate above 30 MHz and digitize voice at greater than 4,8 kbits/s and less than 16 kbits/s. All such equipment must be capable of digitizing voice using 12 kbit/s Continuously Variable Slope Delta-modulation (CVSD). <br>Note: This standard applies only to Type I (i.e., protection of classified information) systems and does not restrict the use of other systems, such as Data Encryption Standard (DES) encryption or analog and quasi-analog scrambling systems.