TACTICAL INTELLIGENCE SUBSYSTEM

terrestrial (wireline) systems with the SATCOM, Defense Satellite Communications Systems, and alternate hf systems. This system extends shore communications seaward and gives commands at sea the same Secure Voice telephone communications currently provided to the worldwide shore es- tablishment. The RWI provides interconnection among the Secure Voice Improvement Program (SVIP) channels (STU-III units), a RED telephone bus, the Advanced Narrowband Digital Voice Terminal, SATCOM radio terminals (uhf, shf, and in the future, ehf), and hf radio links. TACTICAL INTELLIGENCE SUBSYSTEM The Tactical Intelligence subsystem (TACINTEL) is used to transmit special-intelligence communica- tions. A link-control protocol has been adapted to a for- mat required for communication across a DAMA- supported channel using a polling scheme that can sup- port a net membership of 23 subscribers. A portion of a DAMA 25-kHz channel on each of the FLTSATCOM satellites has been allocated for TACINTEL. A TACIN- TEL subsystem is shown in figure 3-8. TACINTEL also processes time-sensitive sensor data and other data essential to Indications and Warnings and OTH-Targeting. In addition, this system, unlike CUDIXS/NAVMACS, can be used for direct ship-to-ship interchange of this data. Rf Transmission TACINTEL baseband equipment uses an rf terminal in common with other subsystems at both shore facilities and subscriber terminals. Shore facilities use an AN/WSC-5(V); subscribers use an AN/WSC-3(V). The TACINTEL channel operates as a half-duplex uhf link at 1200, 2400, or 4800 bps. Modulation is DPSK Subscriber Reception Each subscriber has an identification number recognized by the subscriber processor. This number serves as the initial basis for incoming message screening. Screened message traffic is sent to the TACINTEL peripheral equipment (printer) or the interfacing systems. The remaining message traffic is discarded without release. Future TACINTEL The TACINTEL II program will upgrade the existing TACINTEL and incorporate state-of-the-art hardware and software. It will be a computer-based message communications system, enabling automatic receipt and transmission of Special Intelligence communications for both ashore and afloat users. During the transition, it will be compatible with the present TACINTEL. TELETYPEWRITER SUBSYSTEM The Teletypewriter Subsystem expands existing teletypewriter communications networks by using satellites as relay stations. The Navy continues to have numerous uses for the 75-bps tty. These include dedicated full-time terminations for beyond-line-of-sight tactical and report-back circuits and as backup connectivity for networks such as CUDIXS/NAVMACS and TACINTEL. A non-DAMA-configured teletypewriter subsystem is shown in figure 3-9. Figure 3-9.—Teletypewriter subsystem-non DAMA. 3-13