3C251 Volume 4. UREs only.
The longer distances involved in communications with forces of Europe
The need for more reliable high-capacity communications
The development of line of sight (LOS) communications
The need for more resistance to nuclear blast
Direct and surface
Sky and surface
Ground and sky
Direct and sky
Reflection
Refraction
Diffraction
Diffusion
Less dense and at a lower altitude
More dense and at a lower altitude
Less dense and at a higher altitude
More dense and at a higher altitude
Frequency of optimum traffic
Maximum usable frequency
Most usable frequency
Critical frequency
An active system
A passive system
A synchronous system
A low-altitude system
It can't amplify signals
It orbits the earth in a figure eight pattern
The transmitted frequency is below 10-gigahertz (GHz)
The two-way propagation delay is about 0.6 seconds
10 gigahertz (GHz)
8 GHz
6 GHz
4 GHz
Faraday effect
Doppler effect
Free space attenuation
None of the above
Transmit frequency drift
Transmit frequency drift off phase-lock ground receivers
The satellite's motion in space relative to ground stations
Rotation of the polarization of radio waves
Earth
Space
Orbital
Control
Station keeper
Satellite amplifier
Satellite transponder
Regenerative repeater
An active satellite and one earth terminal
An active satellite and two earth terminal
Two active satellite and one earth terminal
Two active satellite and two earth terminal
Satellite control
Station keeping
Satellite ground track
Communications control
Spread spectrum multiple access (SSMA)
Frequency division multiple access (FDMA)
Demand assignment multiple access (DAMA)
Time division multiple access (TDMA)
Power
Frequency
Synchronization
Transponder complexity
Frequency division multiple access (FDMA)
Time division multiple access (TDMA)
Spread spectrum multiple access (SSMA)
Band spreading multiple access
Defense Logistics Agency
Communications Squadron
Air Force Communications Agency
Defense Information Systems Agency (DISA)
End offices are multiple-homed
End offices do not interoperate with allied networks
The DSN offers precedence access thresholding (PAT)
The DSN offers single multilevel precedence and preemption (MLPP)
End offices are multiple-homed
End offices do not interoperate with allied networks
The DSN offers precedence access thresholding (PAT)
The DSN offers single multilevel precedence and preemption (MLPP)
Flash
Priority
Intermediate
Flash Override
Flash
Priority
Intermediate
Flash Override
KG-84
KG-94
KIV-7
Secure telephone unit-III (STU-III)
Access line protocol functions
Network management functions
Internal call processing features and functions
Administrative, operations and maintenance functions
A Secure telephone unit-III (STU-III) cannot make calls through a RSU
Precedence calling is not available with a RSU
RSU can become saturated and deny all service
RSU can become isolated from the parent switch
Timing and synchronization
Network management
Transmission
Switching
End office (EO)
Stand-alone
Multifunction
Private branch exchange (PBX)
End office (EO) only
Stand-alone only
EO and multifunction only
Stand-alone and multifunction only
Access lines only
Interswitch trunks only
Baseband links and access lines
Baseband links and interswitch trunks
Access lines only
Interswitch trunks only
Baseband links and access lines
Baseband links and interswitch trunks
Global Network Operations and Security Control Center (GNOSC)
Regional Network Operations and Security Control Center (RNOSC)
Subregional Control Facility (SRCF)
Local control center (CC)
Orderwide channel and timing channel
Supervisory channel and alarm channel
Synchronizing channel and alarm channel
Synchronizing channel and signaling channel
Digital carrier module
Control module
Trunk module
Line module
Line
Trunk
Control
Digital carrier
Controller digital carrier
Input/output controller (IOC)
Network module (NM)
Central control (CC)
The line module reports a subscriber origination to the central control (CC)
The trunk module reports a subscriber origination to the CC
The CC sends a message to the terminating peripheral processor to send ringing tone
The CC sends a message to the originating peripheral processor module to remove ringing tone
The line module reports a subscriber origination to the CC
The trunk module reports a subscriber origination to the CC
The message is sent to the terminating peripheral processor to send ringing tone
The message is sent to the originating peripheral processor module to remove ringing tone
Operational support only
Command and control (C2) only
Logistics and operational support
Logistics and C2
KG-84 only
Secure telephone unit-III (STU-III) only
KG-84 and secure telephone equipment (STE)
STU-III and STE
Crypto key card
FORTEZZA key
FORTEZZA card
Crypto ignition key
Secure terminal equipment (STE)
Secure telephone unit-III (STU-III)
KG-84
KG-94
9.6 Kbps
14.4 Kbps
19.2 Kbps
28.8 Kbps
Multilevel security
Class of service marks
Precedence access thresholding (PAT)
Multilevel precedence and preemption (MLPP)
Line module
Interface ancillary device
Interface and control unit
Network termination device
Secure telephone unit-III (STU-III) trunk circuits
Digital subscriber voice telephone (DSVT) trunk circuits
Digital trunk group circuits
Digital trunk circuits
Line module
Interface ancillary device
Interface and control unit
Network termination device
Operated and managed as a base communications asset
Considered one of the primary components of the Defense Information Systems Network (DISN)
Interconnected via the Defense Information Systems Agency Asynchronous Transfer Mode (DATM) network
Partially protected by encryption devices
Operated and managed as a base communications asset
Considered one of the primary components of the Defense Information Systems Network (DISN)
Interconnected via the Defense Information Systems Agency Asynchronous Transfer Mode (DATM) network
Completely protected by encryption devices
KG-84
KG-194
KIV-7
Network Encryption System (NES)
Microwave and laser
Microwave only
Satellite and laser
Satellite only
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