Selection  of  the  carrier  frequency Measurement   of   time   of   arrival   data   for position and synchronization calculations Execution of the Built-in Tests (BIT) for fault isolation Generation  of  alerts The Network   Interface   Computer   Program (NICP) is the software that runs in the DDP and is responsible for the communications with the JTIDS RF  network. The  NICP  controls  message transmission and reception processing, coarse and fine terminal synchronization, relative navigation processing, and terminal and network monitoring. Figure 5-9 is the block diagram for the DDPG. The global memory in the DDP is shared by all the processors in the terminal. Communications between the processors is over an internal bus called the plain text  bus.  All  transactions  on  the  plain  text  bus  are either read or write commands to the global memory or port-to-port transfers. When the SICP, running in the IU, needs to communicate with the NICP, it does so by using the shared global memory in the DDP. A port-to-port  transfer  is  a  transfer  of  data  between ports,  such  as  when  communicating  with  the  host external timer (see fig. 5-9). SECURE  DATA  UNIT.—  The  SDU  is  a removable  assembly  that  is  mounted  to  the  IU.  It stores  the  cryptovariables  that  are  loaded  during initialization.  The  SDU  provides  for  both  message security and transmission security. Message security is  provided  by  the  encryption  of  the  data,  while transmission  security  is  provided  by  the  pseudo- random   frequency-hopping   pattern   and   the introduction  of  a  pseudo-random  pattern  of  noise  and jitter on the RF signal. RECEIVER/TRANSMITTER  GROUP.—  The R/T is in the top drawer of the equipment cabinet and processes the radio frequency signals. The R/T also generates  a  75-MHz  intermediate  frequency  signal used for internal communication between the R/T and DDPG. When a Link-16 message is received, the R/T 5-11 converts  the  RF  to  the  intermediate  frequency  and sends  it  to  the  DDPG  for  processing. When  the terminal  transmits  a  Link-16  message,  the  R/T receives  a  Continuous  Phase-Shift  Modulation  (CPS) IF signal from the DDPG. The R/T then converts it to a 200-watt RF signal that is sent to the high-power amplifier  group. HIGH-POWER AMPLIFIER GROUP.— The HPAG  is  in  the  second  drawer  of  the  equipment cabinet and consists of a high-power amplifier and the antenna interface unit (AIU). The signal from the R/T group is received by the HPAG and amplified from 200 to 1,000 watts. The HPAG can also operate in a low-power mode, in which case the output signal is about  200  watts.  The  AIU  provides  the  interface between the output of the HPAG and the antenna. POWER INTERFACE UNIT.— There are two Power  Interface  Units  (PIUS)  in  the  equipment cabinet. The fourth drawer is the HPAG PIU and the bottom drawer is the PIU for the R/T and DDG. The two PIUS are identical. The three-phase, 115-VAC, 60-Hz  input  power  is  converted  to  two  outputs:  three phase, 115-VAC, 400-Hz, and one-phase, 115-VAC at 400 Hz. COMMAND  AND  CONTROL  PROCESSOR The Command and Control Processor (C2P) is a message distribution system designed to control and manage the interfaces between the three tactical data links (Link-4A, Link-11, and Link-16), the operator, and  the  hardware. PURPOSE OF THE C2P The  C2P  controls  and  manages  the  interfaces between the various data links on major surface and aircraft Command and Control (C2) platforms. The surface platforms that will have the initial installations of the C2P system are aircraft carriers (CV, CVN) and AEGIS  cruisers  (CG),  followed  by  installation  on amphibious assault ships (LHA, LHD), and AEGIS destroyers  (DDG).  There  are  two  configurations  of the  C2P,  one  tailored  for  ships  with  the  Advanced Combat   Direction   System   (ACDS)   Block   0 configuration and   one   for   ACDS   Block   1


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