Table 2-2.—Radiotelephone Prowords, Equivalent Prosigns, and Operating Signals

Table 2-2.—Radiotelephone Prowords, Equivalent Prosigns, and Operating Signals—Continued USE OF OPERATING SIGNALS RADIOTELEPHONE SECURITY Operating signals are not designed for R/T transmission. In R/T procedures, operating information is normally conveyed in concise phrases. However, in two circumstances it is permissible to use operating signals contained in Communication Instructions, Operating Signals, ACP 131, instead of standard R/T phrases. These circumstances are where there are language difficulties and where practical if there is no risk of confusion. In such instances, operating signals must be preceded by the word “PROSIGN” or “OPERATING SIGNAL.” Prosigns and operating signals are transmitted using only authorized phonetic equivalents. The prosign INT is transmitted in its prosign equivalent; that is, INTERROGATIVE. The prowords I SPELL and FIGURES are not used. Examples of prosigns and operating signals are: 2-8 In addition to adhering to circuit discipline, all users are responsible for observing proper security precautions on R/T nets. For example, many units at sea use classified call signs on tactical nets. If the operator does not know the operating situation, the classified call could be linked to the unclassified call sign for that ship. Such unauthorized disclosures are why BEADWINDOW procedures have been introduced into the R/T process. BEADWINDOW BEADWINDOW is a real-time procedure used to alert circuit operators that an unauthorized disclosure has occurred over a nonsecured circuit. BEADWINDOW also warns other operators on the net of the disclosure. This serves as an educational aid. The long-term benefits of the BEADWINDOW procedure include an increased awareness of the proper use of voice circuits throughout the fleet and better security of uncovered Navy voice communications.