data and hamming tones are quadrature phase shifted
with respect to the previous frame.
LINK-11 PROTOCOL AND INTERFACE
CONTROL— The DTS controls the proper protocols
and interface with the CDS computer. The protocols
are controlled by the generation of the control codes.
Interface with the CDS computer is controlled by the
DTS through the use of external interrupts.
DTS CONTROLS AND INDICATORS— The
DTS control panels provide the operator the means for
controlling the operation of the DTS. The physical
design of the control panels of the various data
terminal sets varies, but the panels all perform the
same functions.
Important controls include the
sideband select switch, the data rate switch, the sync
mode switch, and the net control/picket switch.
Indicators are provided to indicate several types of
errors.
ADDRESS CONTROL INDICATOR— The
address control indicator is used to set the addresses
of the participating units in the net. The address
control indicator is only used when the DTS is in the
net control station mode.
RADIO SET INTERFACE— The radio set
interface of the DTS provides for the transfer to and
reception from the radio set of the composite audio
tone package. The DTS receives the composite audio
on the upper and lower sidebands when using HF
frequencies and the upper sideband only when using
UHF frequencies. The DTS provides a key-line signal
to put the radio set in the transmit mode during the
transmission cycle.
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