Figure 4-15.—The AN/USQ-59 mode control panel.and input to the computer. Link-11 uses the half-duplex mode.SIDEBAND SELECT SWITCH —When theSIDEBAND SELECT switch is placed in the LSB orUSB position, the DTS processes only the lowersideband or upper sideband of the received signal.When the switch is in the DIV position, the DTScombines both the upper sideband and the lowersideband signals to create frequency diversity data forinput to the computer. When the switch is in theAUTO position, the DTS selects the signal with thebest receive quality for processing. The AUTOposition is the normal position of this switch.DATA RATE SWITCH —Selects the data ratethat the data converter uses. When the switch is in theDUAL 1200 position, the data converter can transmitand receive two unrelated streams of data at 1200 bps.In the 1200 and 2400 positions, the data converter4-14transmits and receives a single data stream at 1200and 2400 bps, respectively. When the switch is in theTADIL A position, the data rate is controlled by theDATA RATE switch on the TADIL A control panel.The TADIL A position is the normal position forLink-11.SYNC MODE SWITCH —The SYNC MODEswitch selects the mode of synchronization used bythe DTS receive circuitry and is used in conjunctionwith the TIMING STORED/CORRECTED switch onthe TADIL A control panel. The normal operatingposition for the SYNC MODE switch is in theFAST/CONT position.When the switch is in the FAST/CONT position,both the fast and continuous synchronization circuitsof the DTS are selected. Synchronization is initiallyobtained during the five-frame preamble andmaintained continuously during the data portion of thetransmission. The TIMING switch on the TADIL Acontrol panel must be in the CORRECTED position.W h e n t h e F A S T p o s i t i o n i s s e l e c t e d ,synchronization is only during the five-framepreamble. If the CONT position of this switch isselected, only the continuous synchronization circuitsare selected. Synchronization is obtained only duringthe data portion of the transmission. The TIMINGswitch on the TADIL A control panel must be in theCORRECTED position for both of these modes.The INHIBIT position of this switch disables boththe fast and continuous synchronization circuits of theDTS. The DTS will maintain the time base that wasstored when the switch was turned to INHIBIT. Forsynchronization to be held, the unit with its syncmode inhibited must maintain its original geographicrelationship to all other units in the net. This positionis used when the received signal contains interferencethat could cause loss of synchronization.OPERATE/SELF-TEST SWITCH — T h isswitch must be in OPERATE for normal on-lineoperations. When the switch is placed in the SELF-TEST mode, the DTS is placed in an off-line modeand the fault isolation circuitry is enabled.
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