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Chapter 2 for the DSS engine data recording and Chapter
27 for the CSS data recording. The DSU is loaded with
JTIDS initialization data using the TAMPS. On the selection
of DOWNLOAD on the DEU, the mission computer
quests the ITIDS initial&&ion data stored on the DSU,
pmccsses it, and transfers it to the JTIDS termimd. The
exchange of JTIDS initial&ion data is pertomied be
twecntheDSS,missioncomputer,a ndJTIDSviathe 1553
bus andt akesa pproximately5 secondsto complete.W ithout
initialiition data, ITIDS tacan and BIT lbnctions will
operate but JTIDS synchronization, navigation, and
communication functions will not be available.
ORIGINAL 19-22
NAVAIR 0%F14AAD.1
Figure 19-13. JTIDS Control Panels (Sheet 1 of 3)
19-23 ORIGINAL
NAVAIR OM=l4AAD-~
NOMENCLATURE FUNCTION
0
ZEROIZE switch ZERO - Zeroizes the crypt0 variables in the interface unit and the DSS
JTIDS initialization load.
NORM - Normal switch position (Spring loaded).
0
THRM ORIDE switch ON/OFF - Enables manual override of thermal shutdown. Indicated by a
JTIDS HOT on the MFD caution advisory window.
0
JTIDS MODE switch OFF - Removes all power from the JTIDS/Link-16 functions of the
JTIDS terminal and zeroizes the crypto. To power down the
JTIDS terminal, both JTIDS and Tacan have to be off.
STBY - The JTIDS/Link-16 functions are off, the battery will hold
crypt0 for up to 46 hours and initialization data for 5 minutes.
DATA SIL - The JTIDS/Link-16 is on but will not transmit except during
BIT and voice. Net Entry will perform passive sync and once
sync is achieved voice will transmit when keyed. Tacan
transmissions are not affected by this selection. Digital tacan
is available for display on the MFDs and HUD.
NORM - The JTIDS/Link-16 is on. Net Entry will perform active
synchronization and once sync is achieved all Link-16
transmit functions are available. Tacan transmissions are
unaffected by this selection. Digital tacan is available for
display on the MFDs and HUD.
POLL - This mode is currently not used; however if selected
JTIDS/Link-16 is on and digital tacan is available for display
on the MFDs and HUD.
@
IPF RESET switch Re-enables Link - 16 transmission when they are shut down by an IPF
detected failure.
0 REPLY switch NORM - Enables Link-4 reply message transmission (no JTIDS
function)
CANC - Inhibits Link-4 reply message transmission (no JTIDS
function)
@ lX&LlNK MODE TAC - Selects Link-4 (AN/ASW-27C) as the primary link system.
The following JTIDS functions operate in this mode.
l Synchronization
l Ownship PPLI messages are transmitted (Ownship System Status
messages are inhibited)
l JTIDS voice (transmit and receive)
l JTIDS navigation updates
0 Tacan
JTIDS - Selects Link-16 (AN/URC-107) as the primary link system.
All Link-4 functions are disabled.
ORIGINAL 19.24
Figure 19-13. JTIDS Control Panels (Sheet 2 of 3)
NAVAIR Ol-F14AAD-1
/ 0 ADDRESS thumbwheel Selects fourth and fifth least significant octal digit for Link-4 address.
NOMENCLATURE FUNCTION
CAINSI
WPT - Enables Link-4 carrier alignment and waypoint data to be
received every 16 ms with no reply data. The same JTIDS
functions operate in this mode as when TAC is selected.
Note
The status of this switch is sent to the MCS by the DEU. In the
event the DEU is not ready (No 1553 communications) the
mode will default to Link-4 (D/L). This will prevent loss of the
ACLS function in the event of a failure.
Figure 19-13. JTIDS Control Panels (Sheet 3 of 3)
19.6.4 JTIDS System Operation. Procedures for
the operational use of the JTIDS system are provided in
the following paragraphs. These paragraphs include
power-up, initialization, and synchronization. These
procedures are normally performed on the ground during
aircraft startop; however, they can be performed
anytime power is applied to the aircraft and the MCS is
in full-up operation.
Note
For other participants to display the F-14D
PPLI, the INS or SAHRS has to complete
alignment. During alignment, the PPLI message
will be transmitted with position set to
no statement.
The following steps are required to power-up and
initialize JTIDS.
19.6.4.1 Powerup
1. Verify STBY is selected on the JTIDS control
panel and crypto has been loaded.
2. Verify/install the DSU cartridge.
Note
l WithaircrafipowerON, theDSU28VDC
C/B (9G3) should be disengaged before
installing or removing the DSU from its
receptacle. Failure to remove the power
can erase or damage the DSU cartridge.
　
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