POST TEST 2- Introduction to Joint Multi-TDL Network Operations
What are the terminal design features that contribute to JTIDS/MIDS jam resistance? Select all that apply.
- High hopping rate of 76,923 hops per second - Error Detection and Correction (EDAC) coding - Pseudorandom frequency-hopping pattern over 51 discrete center frequencies
Which of the following are disadvantages of Indirect (Relay) connectivity? Select all that apply.
- Increased Time Slot Duty Factor (TSDF) - Each leg must meet the point-to-point criteria - Multiplies the time slot requirements (the relayed message needs a time slot to be transmitted in)
How many JTIDS/MIDS net numbers are there?
127
How many nets can operate in a Link 16 network before reaching maximum spectral capacity?
20 nets
How many frames are in an epoch in Link 16 communications?
64
Each JTIDS/MIDS transmissions contains a ____________ pulse stream.
72, 258 or 444
Which of the following is a purpose of the Network Description Document (NDD) COMSEC Cross Reference Table?
Assigns Crypto Variable Logic Labels (CVLLs) and Waveform instance Identifier (WII) for each platform
Under which MIDS terminal mode are all the IPF features disabled?
Combat Protect (2)
Which JTIDS/MIDS access mode allows multiple participants to share common timeslots using the same net resulting in receivers hearing the closest transmitter?
Contention access
A(n) ______________ is a number between 1 and 127 that the network designer assigns to the TSEC and MSEC for each time slot.
Crypto Variable Logic Label (CVLLs)
Which of the following IS NOT true of Link 16 spread spectrum processing?
Decreases the power transmitted over any single frequency
Which JTIDS/MIDS access mode allows only one unit to transmit per timeslot and goes unused if that specific participant has no data to transmit?
Dedicated access
Which of the following accurately describes Time Division Multiple Access (TDMA)?
Dictates platforms take turns transmitting and receiving data according to time
What are the two types of JTIDS/MIDS RF connectivity?
Direct connectivity and indirect connectivity
Link 16 line-of-sight connectivity is limited by what type of signal propagation?
Direct wave propagation
Which of the following is a characteristic of a JTIDS/MIDS pulse?
Each pulse is 3 MHz wide and 6.4 microseconds in duration
Which of the following IS NOT a factor when choosing crypto key for a network? Select all that apply.
Employment of Dedicated Timeslot Reuse
Which of the following is determined by the Message Security (MSEC) variable in Link 16?
Encryption and decryption of message data
Which of the following IS NOT a function provided by the Link 16 terminal's Platform J connection?
J-Series messages using JREAP C protocol
Which source document is used to determine foreign JTIDS/MIDS EMC restrictions?
JTIDS/MIDS Multinational Ad Hoc Spectrum Support Working Group Notebook
A ___________ is a group of participants, or terminals, in synchronization sharing a common understanding of timeslot boundaries.
JTIDS/MIDS Network
Which Link 16 jam resistance characteristic defines the power output needed to jam Link 16 communications at equal distances?
Link margin
Which JTIDS/MIDS access technique is not operator selectable and allows different groups of users to exchange information in different Network Participation Groups (NPGs)?
Multi-nets
What is another term for the hopping pattern used by a terminal for a single transmission?
Net
In which Link 16 security mode are discrete Crypto Variable Logic Labels (CVLLs) assigned to both TSEC and MSEC?
Partition Variable Mode (PVM)
Which category of frequency assignment authorization is good for five years and is entered into the Government Master File (GMF)?
Permanent Frequency Assignments
Which of the following IS NOT directed in CJCSI 6232.01 Link 16 Spectrum Deconfliction?
Provides information about timeslot allocation
Which Link 16 jam resistance characteristic defines the required distance between a jammer and a receiver to jam Link 16 communications using equal power?
Range ratio
What technique is used by Link 16 terminals to correct errors and erasures in a message in order to pass uncorrupted data to the host system?
Reed Solomon Error Detection and Correction (EDAC) coding
Match the correct Built in Test (BIT) to the correct description.
Start-Up BIT= Conducted any time the terminal is switched from the OFF or Standby (STBY) state to the ON state. It is a self-test that will detect general Line Replaceable Unit (LRU) and Shop Replaceable Unit (SRU) failures. Operational BIT= This BIT is always running in the background while the terminal is on. It will detect a degradation in the terminal's performance, communication/network degradation, or terminal failure such as a LRU or SRU fail. Interruptive BIT= This BIT is an operator initiated BIT that will stop the terminal from transmitting and fault-isolate to the first, second, and third most probable SRU.
What is the purpose of a Link 16 terminal's Secure Data Unit (SDU)?
Stores cryptovariables for message and transmission security
Which JTIDS/MIDS access mode allows units to automatically and dynamically assign surveillance capacity based on platform need?
Timeslot Reallocation (TSR)
Which type of relay requires only that at least one platform be assigned relay timeslots and has enabled the relay function?
Unconditional Relay
