Figure 4-13.—Broadcast mode message format.
control the transmit and receive states of the radio set
are also generated by the DTS. Data received from
the upper sideband (USB) and lower sideband (LSB)
portions of the radio set receiver, in the form of audio
tones, is converted into parallel binary data and sent to
the CDS computer.
Currently several design generations of Link-11
data terminal sets are used in the fleet. These include
the AN/USQ-59 and 59A, the AN/USQ-63, and the
AN/USQ-74. Originally introduced in the early
1960s, each successive generation of the Link-11 data
terminal set reflects additional knowledge gained
from fleet use and advances in technology. Although
the technology used in the different models of the
Link-11 DTS may be vastly different, all of them
perform the same function. Normally, the DTS
operates in the half-duplex mode, meaning it can
either receive or transmit data, but it cannot do both at
the same time. An exception is during system test
when the DTS operates in full-duplex mode and can
simultaneously send and receive data.
DATA TERMINAL SET FUNCTIONS
The DTS also performs the following functions:
Error detection and correction
Audio signal generation
Link-11 protocol and interface control
Error Detection and Correction (EDAC)
The DTS receives data from the CDS computer in
the form of 24-bit binary data words. The 24-data bits
Table 4-1.—DTS Parity Bit Status Codes
4 - 1 0
