Term
| What led to the development of VHF and UHF radio systems during World War II? |
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Definition
| The need for more reliable high-capacity communications. |
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Term
| The two primary types of radio waves are |
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Definition
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Term
| What condition causes the downward bending of a radio wave as it grazes the top of an obstruction such as a mountain peak? |
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Definition
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Term
| During periods of maximum sunspot activity, what is the density level and altitude effect of the F layer? |
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Definition
| More dense and at a higher altitude |
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Term
| What type of frequency is the highest frequency that returns to earth when it is transmitted vertically under given ionoshperic conditions? |
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Definition
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Term
| A satellite system that requires numerous satellites in randomly spaced orbits to provide acceptable coverage is |
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Definition
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Term
| What is a major disadvantage of a geostationary satellite? |
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Definition
| The two-way propagation delay is about 0.6 seconds. |
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Term
| Above what frequency does the propagation loss because of oxygen and water absorption become very serious in satellite communications? |
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Definition
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Term
| The reduction in amplitude of a radio signal as it travels away from the source through a propagation medium that's free of obstructing, scattering, or reflecting effects is called |
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Definition
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Term
| The Doppler effect, inherent to satellite communications, is caused by |
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Definition
| the satellite's motion is space relative to ground stations |
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Term
| Which satellite communications subsystem consists of a satellite antenna array and a transponder? |
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Definition
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Term
| What satellite device receives, amplifies, and retransmits signals from earth terminals? |
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Definition
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Term
| At a minimum, a typical link involves |
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Definition
| an active satellite and two earth terminals |
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Term
| maintaining optimum performance of a satellite's transponder is a function of |
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Definition
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Term
| What type of multiple-access service used in satellite communications provides each earth terminal exclusive use of the satellite transponder for a specified time interval? |
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Definition
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Term
| Two system control problems with time division multiple access are in the area of network timing and |
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Definition
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Term
| What satellite access system lets several users occupy the same frequency spectrum in the transponder simultaneously? |
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Definition
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Term
| What organization is responsible for the design, acquisition, and single systems management of the Defense Switched Network? |
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Definition
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Term
| How is survivability provided in the DSN? |
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Definition
| End offices are multiple-homed |
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Term
| How is responsiveness provided in the DSN? |
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Definition
| The DSN offers precedence access thresholding (PAT) |
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Term
| What type of DSN precedence call cannot be preempted? |
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Definition
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Term
| What type of precedence is assigned to DSN calls pertaining to situations that gravely affect the security of national and allied forces? |
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Definition
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Term
| Which encryption device makes end-to-end encryption available to any user of the DSN? |
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Definition
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Term
| What is the primary difference in the DSN subsystems? |
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Definition
| Internal call processing features and functions |
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Term
| Why should high-priority users not be terminated on RSU? |
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Definition
| RSU can become isolated from the parent switch |
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Term
| An end office is part of what subsystem of DSN? |
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Definition
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Term
| Which DSN switch functions primarily as a tandem switch? |
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Definition
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Term
| What type of DSN switch provides services to a PBX? |
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Definition
| EO and multifunction only |
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Term
| Which type of connection provides the transmission links between two DSN switches? |
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Definition
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Term
| Which type of connection is a single or multichannel connection that allows user equipment to gain access to the DSN? |
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Definition
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Term
| Which organization provides theater-wide administration and network management in the DSN? |
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Definition
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Term
| In a digital multiplex switching system, what appears between the peripheral module and the network in addition to the 30 channels of encoded speech? |
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Definition
| Synchronizing channel and signaling channel |
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Term
| Which digital multiplex switch module encodes and multiplexes incoming speech from a maximum of 30 analog trunks into 8-bit PCM format? |
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Definition
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Term
| Which digital multiplex switch module is used for direct interfacing with the T-1 office repeater? |
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Definition
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Term
| Which digital multiplex switch module consists of a duplicated central message controller? |
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Definition
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Term
| When a subscriber lifts the handset to make a dial pulse intra=office call, what process occurs in the DSN switch? |
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Definition
| The line module reports a subscriber origination to the CC |
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Term
| When a called DSN subscriber answers, what action is taken by the switch's CC module? |
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Definition
| A message is sent to the originating peripheral processor to remove ringing tone |
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Term
| The Red switch program provides which subscriber(s) a Red telephone? |
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Definition
| Command and control (C^2) only |
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Term
| What is the major types of terminal used in the Defense Red Switched Network? |
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Definition
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Term
| What type of device is used to provide the cryptographic engine for the secure terminal equipment (STE) terminal? |
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Definition
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Term
| Which encryption device will support asynchronous secure voice modes up to 38.4 Kbps and high-speed data transfers up to 128 Kbps when connected to the 2B+D Integrated Services Digital Network (ISDN)? |
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Definition
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Term
| What is the maximum asynchronous data rate for the DRSN? |
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Definition
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Term
| What type of capability is provided by DRSN to define the needs, capabilities, and limitations of individual trunks and trunk groups? |
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Definition
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Term
| Which piece of equipment is used to provide secure connectivity to the Red switch via an attendant and local-site radio facilities? |
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Definition
| Interface and control unit |
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Term
| What interface provides the Red switch 24-channel digital interswitch trunk group service at 1.544 Mbps? |
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Definition
| Digital trunk group circuits |
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Term
| The piece of equipment that allows a secure digital switch to interface with cryptographic equipment and passes supervisory and address signaling in setting up a secure call is the |
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Definition
| interface ancillary device |
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Term
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Definition
| partially protected by encryption devices |
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Term
| What is the difference between a Hub router and a premise router? |
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Definition
| Interconnected via the Defense Information Systems Agency Asynchronous Transfer Mode (DATM) network |
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Term
| Which is an IP encryption device that can be directly connected to Red LAN? |
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Definition
| Network Encryption System (NES) |
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Term
| In addition to fiber-optic and copper cables, what type of system is used to interconnect integrated communications access package access nodes on a deployed base within the same theater area? |
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Definition
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Term
| Which is the design architecture of TDC? |
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Definition
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Term
| What type of connectivity does TDC provide to the voice backbone? |
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Definition
| 1.544 Mbps ISDN PRI connectivity |
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Term
| What equipment is included in the customer access node to provide the intra-site connectivity? |
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Definition
| Voice switch and Promina multiplexer |
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Term
| What is the major component(s) of the TDC system that provides mobile units with flexible, lightweight, secure, modular, and integrated deployable communications? |
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Definition
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Term
| What is the long-haul transmission component of TDC? |
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Definition
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Term
| What integrated communications access package module contains circuit switches that implement PBX? |
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Definition
| Basic access module (BAM) |
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Term
| What integrated communications access package module provides secure conferencing capability? |
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Definition
| Secure voice module and STU-III |
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Term
| What's the difference between the BAM and the CAM? |
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Definition
| The BAM has a fixed capability |
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Term
| What ICAP node module provides the RF LOS link function for internodal connnectivity? |
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Definition
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Term
| What is the maximum number of personnel a medium size ICAP node can support? |
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Definition
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Term
| What support does the multi-channel standard tactical entry point provide to deploying forces? |
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Definition
| Communications capability to connect to the DISN |
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Term
| Upon arrival in a theater, what frequency band does the LMST use for initial communications connectivity to the defense satellite communications system? |
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Definition
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Term
| What type of equipment is included in TDC sustaining packages and is deployed to the area of operations to form a large network? |
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Definition
| The same versions of modules in the TDC initial communication support packages |
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Term
| What LMST capability reduces the limitations of the DSCS? |
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Definition
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Term
| What deployed system is used to provide secure/nonsecure routers and data packet capability? |
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Definition
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Term
| What TDC system provides defense message system (DMS) message handling services? |
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Definition
| Stand-alone message processing system |
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Term
| What must customers do to connect their own telephones and computer workstations to the TDC backbone network? |
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Definition
| Adhere to various open system standards and interfaces such as Ethernet |
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