NCS - National Communications Systems (Office of Technology and Program)

FED-STD-1002

Tue, 01 Jan 1974 00:00:00 GMT

FED-STD-1002; TIME AND FREQUENCY REFERENCE INFORMATION IN TELECOMMUNICATION SYSTEMS NCS - National Communications Systems (Office of Technology and Program) This standard establishes the requirements for telecommunication facilities and systems of the Federal Government to utilize time and frequency reference information based upon Coordinated Universal Time (UTC).
The purpose of this standard is to facilitate interoperability between telecommunication facilities and systems of the Federal Government.
This standard shall be used by all Federal agencies where interoperability between Federal Government telecommunication facilities and systems is dependent on time or frequency reference information.

FED-STD-1023

Sun, 01 Jan 1989 00:00:00 GMT

FED-STD-1023; TELECOMMUNICATIONS: INTEROPERABILITY REQUIREMENTS FOR ENCRYPTED, DIGITIZED VOICE UTILIZED WITH 25 KHZ CHANNEL FM RADIOS OPERATING ABOVE 30 MHZ NCS - National Communications Systems (Office of Technology and Program) 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.
This standard is to facilitate interoperability between telecommunication facilities and systems of the Federal Government.
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).
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.

FED-STD-1035

Sat, 01 Jan 1977 00:00:00 GMT

FED-STD-1035; TELECOMMUNICATIONS: CODING, MODULATION AND TRANSMISSION REQUIREMENTS FOR SINGLE CHANNEL MEDIUM AND HIGH FREQUENCY RADIOTELEGRAPH SYSTEMS USED IN GOVERNMENT MARITIME MOBILE TELECOMMUNICATIONS NCS - National Communications Systems (Office of Technology and Program) This standard establishes minimum requirements for single channel, narrowband, medium and high frequency (300 KHz - 30 MHz) radiotelegraph systems used in Government maritime mobile telecommunications. Manual on-off keying (i.e., Morse code operation) is not within the scope of this standard.
This standard is to facilitate the interoperability of maritime mobile telecommunication facilities of the Federal Government.
This standard shall be used, to the extent specified herein, by all Federal departments and agencies in the design and procurement of maritime mobile radiotelegraph systems for medium and high frequency operation.

FED-STD-001033

Mon, 01 Jan 1979 00:00:00 GMT

FED-STD-001033; TELECOMMUNICATIONS: DIGITAL COMMUNICATION PERFORMANCE PARAMETERS NCS - National Communications Systems (Office of Technology and Program) This standard defines 26 digital communication performance parameters. Each parameter provides a means of specifying a particular aspect of telecommunication system performance in quantitative terms, from the point of view of the digital services provided to the end users. Collectively, the parameters describe all aspects of telecommunication system performance of major interest to end users. The parameters can be applied to all types of digital telecommunication systems.
The standard does not specify particular numerical values for the defined parameters. Associated standard measurement methods are being developed for a separate proposed Federal Standard (FED-STD-1043).