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Assignment 1-Cont. - 14103_123
Assignment 2-Cont. - 14103_125

Fire Controlman Volume 06-Digital Communications
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ASSIGNMENT 2 Textbook Assignment: “The Link-11 System,”  chapter 2, pages 2-7 through 2-23; “Link-11 Fault Isolation,” chapter 3, pages 3-1 through 3-7. 2-1 . 2-2 . 2-3 . 2-4 . Net  Sync  continuously  broadcasts  which of the following signals? 1.  Phase  reference  frames 2.   Start   codes 3.   Stop   code 4.   Preamble   frames When the stored sync mode is operating, the picket station uses which of the following signals to establish a time base? 1  . 2 . 3 . 4 . An  external  frequency  standard The internal frequency standard in the DTS The sync signal received from NCS The sync signal received form another picket Which of the following functions is NOT tested when Net Test is running? 1.  DTS  to  radio  interface 2.  CDS  computer  to  DTS  interface 3.  Radio  to  antenna  interface 4.  Radio  receiver  function The preamble of a Link-11 message consists of a total of how many frames? 1.  Five 2.   Six 3.   Seven 4.  Eight 2-5 . 2-6 . 2-7 . During  transmission  of  the  preamble,  the 605 Hz tone is transmitted at which of the following power levels? 1.   –6   dB 2.   +6   dB 3.  –12  dB 4.  +12  dB To enable the DTS to detect frame transitions during the preamble, the 2,915 HZ sync tone is phase shifted how many degrees  at  each  frame? 1.      90 2 .    1 8 0 3 .    2 7 0 4 .    3 6 0 The phase reference frame of a Link-11 header  performs  which  of  the  following functions? 1.  Provides  synchronization  between the  DTS  and  the  CDS  computer 2.  Provides  a  time  reference  for  the DTS 3.  Provides  a  time  reference  for  the radio 4.  Provides  the  reference  to  extract the  data  in  the  next  frame 10






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