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DTS  CONTROLS  AND  INDICATORS
ERROR  CORRECT/LABEL  SWITCH

Fire Controlman Volume 06-Digital Communications
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F U L L - D U P L E X / H A L F - D U P L E X SWITCH—  In  the  FULL-DUPLEX  position,  this switch   enables   full-duplex   operation   of   the   data converter   and   the   computer   I/O   adapter.   It   also enables  loop  back  processing  of  the  transmit  sidetone data  for  input  to  the  computer.  In  the  HALF- DUPLEX  position,  the  DTS  operates  in  the  half- duplex  mode  and  the  transmit  sidetone  is  disabled from  being  processed  and  input  to  the  computer. Link-11 uses the half-duplex mode. SIDEBAND  SELECT  SWITCH—  When  the SIDEBAND SELECT switch is placed in the LSB or USB  position,  the  DTS  processes  only  the  lower sideband  or  upper  sideband  of  the  received  signal. When  the  switch  is  in  the  DIV  position,  the  DTS combines  both  the  upper  sideband  and  the  lower sideband signals to create frequency diversity data for input  to  the  computer. When  the  switch  is  in  the AUTO position, the DTS selects the signal with the best   receive   quality   for   processing.   The   AUTO position is the normal position of this switch. DATA RATE SWITCH—  Selects the data rate that the data converter uses. When the switch is in the DUAL  1200  position,  the  data  converter  can  transmit and receive two unrelated streams of data at 1200 bps. When  the  switch  is  in  either  the  1200  or  2400 position, the data converter transmits and receives a single data stream at 1200 or 2400 bps, respectively. When the switch is in the TADIL A position, the data rate is controlled by the DATA RATE switch on the TADIL  A  control  panel.  The  TADIL  A  position  is the normal position for Link-11. SYNC MODE SWITCH— The SYNC MODE switch selects the mode of synchronization used by the DTS receive circuitry and is used in conjunction with  the  TIMING  STORED/CORRECTED  switch  on the  TADIL  A  control  panel.  The  normal  operating position   for   the   SYNC   MODE   switch   is   in   the FAST/CONT position. When the switch is in the FAST/CONT position, both the fast and continuous synchronization circuits of the DTS are selected. Synchronization is initially obtained   during   the   five-frame   preamble   and maintained continuously during the data portion of the 2-14 transmission. The TIMING switch on the TADIL A control panel must be in the CORRECTED position. When   the   FAST   position   is   selected, synchronization   is   only   during   the   five-frame preamble.  If  the  CONT  position  of  this  switch  is selected,  only  the  continuous  synchronization  circuits are  selected.  Synchronization  is  obtained  only  during the  data  portion  of  the  transmission.  The  TIMING switch on the TADIL A control panel must be in the CORRECTED position for both of these modes. The INHIBIT position of this switch disables both the fast and continuous synchronization circuits of the DTS. The DTS will maintain the time base that was stored when the switch was turned to INHIBIT. For synchronization  to  be  held,  the  unit  with  its  sync mode  inhibited  must  maintain  its  original  geographic relationship  to  all  other  units  in  the  net.  This  position is used when the received signal contains interference that could cause loss of synchronization. OPERATE/SELF  TEST  SWITCH—  This switch  must  be  in  OPERATE  for  normal  on-line operations. When the switch is placed in the SELF TEST mode, the DTS is placed in an off-line mode and the fault isolation circuitry is enabled. CONTROL  ON/OFF  SWITCH—  When  the CONTROL  switch  is  placed  to  the  ON  position, +28Vdc  is  applied  to  the  fault  isolation  control  panel, the mode control panel, the TADIL A control panel, and  the  address  control  panel. TADIL A Control Panel The TADIL A control panel provides the control switches   and   indicators   required   to   control   and monitor Link-11 operations. Figure 2-16 shows the AN/USQ-59 TADIL A control panel. XMT  DATA  ERROR  INDICATOR—  This indicator  is  lighted  when  the  DTS  detects  an  error while transmitting data in the TADIL A, or Link-11, mode.






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