If an even number of bit errors occurs, the correction
circuitry is inhibited. If an odd number of bit errors
occurs, the correction circuitry attempts to correct the
data; however, if an odd number of multiple bit errors
occurs, an erroneous correction is made. When the
switch is in the LABEL position, the DTS does not
attempt to correct detected errors. Instead, the data
word sent to the computer is labeled to indicate that
errors were detected in the data word.
T R A N S M I T R E S E T S W I T C H . T h e
TRANSMIT RESET switch is a momentary contact
pushbutton switch. When depressed, this switch
causes any transmission in progress to be terminated.
The DTS stops the transmission by inhibiting the
generation of the output data request, causing a stop
code to be transmitted. The DTS also resets the
address control address sequence logic.
TRANSMIT INITIATE SWITCH. T he
TRANSMIT INITIATE switch is a momentary
contact pushbutton switch that causes the DTS to
initiate data transmission when the DATA RATE
switch is in the TADIL A position. The TRANSMIT
INITIATE switch must be depressed to initiate all
DTS transmissions except when the DTS is
configured as a picket and is in the roll call mode.
When the net is in the roll call mode, only the net
control station is required to initiate transmission by
depressing the TRANSMIT INITIATE switch.
MISS CALL INDICATOR. The MISS CALL
indicator is lighted when the net control station has
detected no response from a picket station after two
successive interrogations. Once lit, it will remain lit
until a picket responds or the TRANSMIT RESET
switch is depressed.
A D D R E S S
C O M P U T E R / C O N T R O L
S W I T C H . T h e
A D D R E S S
COMPUTER/CONTROL switch determines the
source of the address used by the DTS. When the
switch is in the CONTROL position, addresses are
obtained from the address control unit. In the
COMPUTER position, addresses are obtained from
the CDS computer, provided the computer is
configured for external function operations. The
normal position for this switch is dependent on the
configuration of the system on your ship.
NET MODE SWITCH. The NET MODE
switch determines the mode of operation of the DTS.
The modes are BC or broadcast, SHORT BC, ROLL
CALL, NET SYNC, and NET TEST.
DATA RATE SWITCH. The DATA RATE
switch determines the speed and frame timing
operation of the DTS. When the switch is in the
1364/9.09 position, the DTS transmits and receives
data at 1364 bps. The data frame phase identification
interval is approximately 9.09 milliseconds. When
the switch is in the 2250 position, the DTS transmits
and receives data at a rate of 2250 bps and a frame
interval of 9.09 milliseconds. When the switch is in
the 1364/1 8.18 position, the data rate is 1364 bps, but
the frame phase shift interval is increased to 18.18
OWN STATION ADDRESS SWITCH. The
OWN STATION ADDRESS switch consists of two
thumb wheel switches in which an address is entered
to identify the address the DTS will respond to as its
own. In the roll call mode and with the DTS
configured as a picket station, the DTS will transmit
its tactical data when the interrogation message
address matches the address entered into the OWN
STATION ADDRESS switches.
RANGE IN MILES SWITCH. The RANGE
IN MILES switch also consists of two thumb wheel
switches. These switches are used to select the
approximate distance between the net control station
and the picket station. The range entered into these
switches causes the DTS to alter the frame timing to
compensate for the signal propagation delay between
the picket station and NCS. The range in miles
setting for the NCS is always zero miles.
Address Control Indicator
The address control indicator is used to set the
address of the picket stations to be interrogated when
a unit is configured to operate as the NCS. The
address control indicator is shown in figure 4-17. The
address control indicator consists of 20 identical
address selection modules, which are used to address