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.
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