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JTIDS- Post Test 2 With
Solution
Which of the following is a function provided by the Link 16 terminal's JREAP C connection? - ANSWER J-Series messages using JREAP C protocol
How many frames are in an epoch in Link 16 communications? - ANSWER NOT 112.
What are the two types of JTIDS/MIDS RF connectivity? - ANSWER Direct connectivity and indirect connectivity
Link 16 line-of-sight connectivity is limited by what type of signal propagation? - ANSWER Direct wave propagation
Which JTIDS/MIDS access technique allows a common group of timeslots to be used for the same function but on different operating selectable nets? - ANSWER Stacked Nets
Which JTIDS/MIDS access technique is not operator selectable and allows different groups of users to exchange information in different Network Participation Groups (NPGs)? - ANSWER Multi-nets
Which of the following IS NOT determined by the Transmission Security (TSEC) variable in Link 16? - ANSWER NOT Symbol interleaving start point
In which Link 16 security mode is a discrete Crypto Variable Logic Labels (CVLLs) assigned to only the TSEC which is used for message encryption as well? - ANSWER NOT Partition Variable Mode (PVM)
What numbers are used by a network designer as Crypto Variable Logic Labels (CVLLs)? - ANSWER 1 - 127
Which of the following is a purpose of the Network Description Document (NDD) COMSEC Cross Reference Table? - ANSWER Assigns Crypto Variable Logic Labels (CVLLs) to Secure Data Unit (SDU) locations for each platform
The JANUS Table can be used to determine the _______________ for a specific calendar day. - ANSWER Current Crypto Period Designator (CCPD)
TRUE or FALSE: MIDS Step Down requires that fighters load no more than two crypto keys for each network. - ANSWER True
Which OPTASK LINK set allows the JICO to provide whether a specific date is a 0 or 1 day? - ANSWER NOT JCRYPDAT
All Link 16 equipped systems must have an approved __________ entry in order to operate. - ANSWER DD Form 1494
What measurement is used to express the pulse density of all Link 16 transmissions in a 12 second frame? - ANSWER Time Slot Duty Factor (TSDF)
Which source document is used to determine foreign JTIDS/MIDS EMC restrictions? - ANSWER JTIDS/MIDS Multinational Ad Hoc Spectrum Support Working Group Notebook
Which of the following MIDS LVTs can transmit at 1000 watts and is also known as MIDS-on-Ship (MOS)? - ANSWER MIDS LVT (5)
What is the purpose of a Link 16 terminal's Secure Data Unit (SDU)? - ANSWER NOT Stores Initialization Data Load (IDL) files
What JTIDS/MIDS protocol dictates that platforms take turns transmitting
Which JTIDS/MIDS access mode allows units to automatically and dynamically assign surveillance capacity based on platform need? - ANSWER NOT Contention access
How many timeslots are in a frame in Link 16 communications? - ANSWER 1,
Which of the following is a characteristic of a JTIDS/MIDS pulse? - ANSWER NOT Each pulse is 13 microseconds in duration
Each JTIDS/MIDS transmissions contains a ____________ pulse stream. - ANSWER NOT 72, 255 or 444
What portion of the electromagnetic spectrum do Link 16 terminals operate?
- ANSWER NOT 225 - 400 MHz frequency band
NOT 175 - 255 MHz frequency band
Link 16 jam resistance is defined in what two ways? - ANSWER NOT Hopping pattern and network design
Which Link 16 jam resistance characteristic defines the power output needed to jam Link 16 communications at equal distances? - ANSWER NOT
Timeslot Duty Factor (TSDF)
A link margin value of 21dB will force an enemy jammer using equal power to get within how many miles of a receiving terminal if the transmitting terminal is 60 miles away? - ANSWER NOT 15 miles or 1/4 the distance
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? - ANSWER NOT Electromagnetic Compatibility (EMC)
NOT Message Security (MSEC)
Which JTIDS/MIDS access technique gives two or more platforms the same time slot, net, and TSEC crypto in which to transmit because they have no requirement to exchange information? - ANSWER Dedicated Timeslot Reuse
Which of the following IS NOT a function provided by the Link 16 terminal's Platform J connection? - ANSWER NOT Provides time slot data to link monitoring systems
Which of the following IS NOT true of Link 16 spread spectrum processing? - ANSWER Decreases the power transmitted over any single frequency
Which OPTASK LINK set designates the crypto required and which SDU locations the crypto is to be loaded? - ANSWER JCRYPDAT
Which of the following IS NOT directed in CJCSI 6232.01 Link 16 Spectrum Deconfliction? - ANSWER NOT Affects all Link 16 users operating within 200 NM of U.S. and its possessions (US&P)
NOT States that JTIDS/MIDS transmissions are on not-to-interfere basis
Which category of frequency assignment authorization is good for five years and is entered into the Government Master File (GMF)? - ANSWER NOT Static Frequency Assignment
Under which MIDS terminal mode are all the IPF features disabled? - ANSWER Combat Protect (2) (Slide 14)
Which of the following IS NOT a Built in Test (BIT) provided by Link 16 terminals? - ANSWER Continuous BIT
Which of the following accurately describes Time Division Multiple Access (TDMA)? - ANSWER NOT Used to exchange J-Series messages using non-JTIDS/MIDS equipment
NOT Divides the frequency band and assigns a frequency to an individual transmission
Which type of relay allows messages received on one net number to be relayed to another net number? - ANSWER Zoom Relay
How many JTIDS/MIDS net numbers are there? - ANSWER 127
How many nets can operate in a Link 16 network before reaching maximum spectral capacity? - ANSWER 20 nets
Which JTIDS/MIDS access mode gives specific, unique transmit timeslots to participant(s) in which all other participants will receive? - ANSWER NOT Multi-nets
Which JTIDS/MIDS access mode is designed for all Network Participation Groups (NPGs) but is currently used only for NPG 7 Surveillance? - ANSWER Timeslot Reallocation (TSR)
The ____________ pseudo-randomly assigns a center frequency to each pulse. - ANSWER Transmission Security (TSEC) crypto variable
Which of the following IS NOT true about a JTIDS/MIDS pulse stream? - ANSWER Incompatible with the National Airspace System (NAS)
Dedicated Timeslot Reuse is a form of what JTIDS/MIDS access mode? - ANSWER NOT Dedicated Timeslot Reuse
Which is not a method that can be used to deconflict Link 16 networks? - ANSWER NOT Using unique TSEC crypto keys for the main net
Which of the following are true about JTIDS/MIDS transmissions? Select all that apply. - ANSWER -Each transmission contains one or more fixed format messages or a free text transmission
-A full transmission occurs in a single timeslot
-Hopping pattern has a hopping rate of 76,923 hops per second
What are the terminal design features that contribute to JTIDS/MIDS jam resistance? Select all that apply. - ANSWER -Pseudorandom frequency-hopping pattern over 51 discrete center frequencies
-High hopping rate of 76,923 hops per second
-Error Detection and Correction (EDAC) coding
