The words and sounds of telephone conversations, (Bell

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Language: English

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Communication between the network facility equipment and the remote computer is accomplished through a data link. Two frequency generators are used to send IF signals at 130 and 150 MHz to the transmitter upconverter (as in the test setup of Fig. 5.47). To proceed with link calculations, as is usual with any radio transmission system, the most important parameters affecting the system design are: 1. If cryptographic equipment is installed or stored within the space and the space will be temporarily unmanned while cryptographic key material and/or SCI material are stored elsewhere, the door will be equipped with a tamper-proof hasp and combination pad-lock. 21.4 Doors and other openings in the perimeter that permit aural or visual penetration of the internal space will be screened, curtained, or blocked. 21.5 An effective, approved secure means of destruction of SCI material will be readily available in the space or nearby in general service spaces. 21.6 Cryptographic equipment used to process SCI information will be located in the SCI space or, if located in a secure processing center other than that accredited for SCI, will be electrically configured so as not to be compatible with the secure processing system of that secure processor. 21.7 All telephones (to include STU-III instruments and sound powered telephones) will be as specified for S/SCIFs. 21.8 Processing of SCI via AIS will be as specified for S/SCIFs.

Pages: 35

Publisher: Bell Telephone System (1930)

ISBN: B00089HI7Q

Bell telephone system technical publications (Volume 8)

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