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CDC 3D151 Edit Code 01 > Volume 2 > Flashcards

Volume 2 Flashcards

0
Q

In hertz (Hz), what range of sound can the human ear detect?

A

20 to 20,000

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1
Q

The process of condensation occurs when air particles are

A

Pressurized causing them to move closer together

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2
Q

The loudness of a sound is closely related to what part of the sine wave?

A

Amplitude

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3
Q

Noise may be introduced into speech signals by thermal agitation and

A

Black body radiation

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4
Q

In hertz (Hz), what is the actual voice frequency band?

A

300 to 3,400

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5
Q

Which models of end offices in the digital multiplex system (DMS) family are commonly used at Air Force bases to provide base telephone services?

A

DMS-100 and Meridian System Logic (MSL)-100

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6
Q

Which model of Digital Multiplex System (DMS)-100 family switches is installed in compact modular cabinets?

A

Meridian System Logic (MSL)-100

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7
Q

What is the maximum number of ports that a Meridian system logic (MSL)-100 will support?

A

30,000

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8
Q

Which type link is normally used to interconnect two peripheral modules (PM) in the Digital Multiplex System (DMS)?

A

DS-30A

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9
Q

What major area is connected to the central side (C-side) of a network module (NM) in the Digital Multiplex System (DMS)?

A

Central control

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10
Q

What is the mounting bracket called on which transmission or switching equipment is mounted in a Digital Multiplex System (DMS)?

A

Bay

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11
Q

What contains bays of the same functional equipment?

A

Frame

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12
Q

Which Digital Multiplex System (DMS) component uses 16 bit Motorola 68000 or eight bit Intel micro processors?

A

A peripheral module’s (PM) peripheral processor (PP)

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13
Q

How many channels of data does each digital signal (DS) 30 speech link carry?

A

32

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14
Q

Up to how many duplicated digital signals (DS)-30 links are used to connect a line group controller (LGC) to the network module (NM)?

A

16

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15
Q

What type of digital signal (DS) links are used to connect the Digital Multiplex System (DMS)-Core and the DMS-Bus?

A

512

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16
Q

How many inter message switch links (IMSL) can be configured in a supernode?

A

2

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17
Q

Where are the system clocks located within the SuperNode?

A

Digital Multiplex System (DMS)-Bus

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18
Q

What type of digital signal (DS) protocol is used as a message carrier between the Digital Multiplex System (DMS)-Bus and the network modules (NM) and input/output controller (IOC)?

A. 1
B. 3
C. 30
D. 512

A

C. 30

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19
Q

Where are the DMS-Core and DMS-Bus housed?

A

Dual plane combined core (DPCC)

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20
Q

What is the first step in the pulse code modulation (PCM) process?

A

The analog signal is band-limited

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21
Q

In the pulse code modulation (PCM) process, changing the quantized samples into a binary word is called

A

Encoding

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22
Q

What is a method of putting many users on a single cable pair?

A

Time division multiplexing

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23
Q

In the time division multiplexing (TDM) process, the rate of sampling must be equal to

A

The highest frequency sampled multiplied by the sampling rate per cycle

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24
Q

Each 125 microsecond time period in the digital signal (DS) 30 signaling format (used within the voice network system) is called a

A

Frame

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25
Q

ISDN can combine voice and data services over the same wires because it uses

A

Standard telephone lines

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26
Q

What type of information is transmitted on a ISDN B channel?

A

User

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27
Q

What are the two major established ISDN transmission rates?

A

Bearer rate interface and primary rate interface

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28
Q

What is the ISDN R interface?

A

Connection point between a non-ISDN compatible device and a terminal adapter (TA)

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29
Q

The network layer of the OSI model provides the

A

Actual routing of the signal

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30
Q

What circuit board in the REDCOM switch provides two signaling channels and is only necessary when interfacing with an ISDN-capable switch?

A

Message transceiver interface

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31
Q

One of the main purposes of the ISDN handset telephone test set is to

A

Verify a dial tone

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32
Q

What is the frame rate in feet per second (FPS) for transmitting video teleconferencing data on the ISDN?

A

30 FPS

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33
Q

What component in the video teleconferencing (VTC) system converts analog signals to digital signals?

A

Coder/decoder (CODEC)

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34
Q

How many channels are used when a VoIP session is established between a private branch exchange (PBX) and another IP host?

A

2, one for each direction

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35
Q

What component of VoIP is an endpoint on the network that provides real-time, bidirectional communications between H.323 terminals and other switch circuit networks?

A

Gateway

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36
Q

What component of VoIP provides call management functions in a defined local area called a zone?

A

Gate keeper

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37
Q

How many milliseconds should the one way delay be from endpoint to endpoint in order to implement voice over Internet protocol (VoIP)?

A

Less than 150

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38
Q

What is the control system that generates a signal with a fixed relation to the phase of a reference signal and responds to both the frequency and the phase of the input signals?

A

Phase-locked loop (PLL)

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39
Q

What are frequencies from 30 to 300 MHz internationally designated as?

A

Very high

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40
Q

The ultrahigh frequency designation applies to frequencies from

A

300 to 3000 MHz

41
Q

Which of the following frequencies has the shortest wavelength?

A. 14 kHz
B. 1.4 MHz
C. 14 MHz
D. 140 MHz

A

D. 140 MHz

42
Q

A mode of operation in which communication is possible between two or more stations, in both directions, using the same frequency, is called

A

Simplex

43
Q

What communication mode(s) of operation allows two or more stations to send intelligence in both directions but not simultaneously?

A

Simplex and half duplex

44
Q

Producing radio frequency energy and radiating useful signals into space is the purpose of the

A

Transmitter

45
Q

What type of modulation produces a constant amplitude transmission?

A

Frequency

46
Q

The ability to maintain a constant output carrier frequency refers to a transmitter’s frequency

A

Accuracy

47
Q

The process of mixing or combining two frequencies in a nonlinear device in an amplitude modulated (AM) receiver is called

A

Heterodyning

48
Q

What components of a frequency modulated (FM) receiver removes the original signal from the sidebands and re-creates the audio intelligence?

A

Discriminator

49
Q

What characteristic enables a receiver to reproduce a desired signal from several closely spaced stations or from interfering frequencies?

A

Selectivity

50
Q

The total resistive properties of a circuit when resistance, capacitive reactance, and inductive reactance are formulated together is called

A

Impedance

51
Q

What transmission line is very common in both fixed and tactical application?

A

Flexible coax

52
Q

What field provides the basis of RF communications by detaching from the conductor and traveling through space?

A

Radiation

53
Q

For best communications, the transmitting antenna

A. Should be circular and huge receiving antenna horizontal
B. Should be vertical and receiving antenna horizontal
C. Should be horizontal and receiving antenna vertical
D. And receiving antenna should have the same polarization

A

D. And receiving antenna should have the same polarization

54
Q

What standard antenna is used for antenna gain comparison?

A

Isotropic

55
Q

When the gain of an anisotropic radiator is compared to the isotropic radiator, the stronger signal of the directional antenna is expressed as

A

Decibels (dB) gain

56
Q

What is the shortest wavelength an antenna can be made resonant?

A

Half

57
Q

What tuning devices are adjusted when tuning the resonant transmission line-resonant antenna connection?

A

Inductors and capacitors

58
Q

What limits a direct wave to normally less than 20 miles?

A

Curvature of the earth

59
Q

Which type of precipitation attenuates RF energy just like rain?

A

Fog

60
Q

What ratio is used to measure the desired signal strength relative to the background noise?

A

Signal-to-noise

61
Q

What combination of AFIs do you use for guidance when determining a technical solution for PWCS?

A

AFI 33-106 and AFI 33-201V1

62
Q

Which PWCS device can be used for command and control?

A

Land mobile radio

63
Q

Which PWCS device’s original intent was for use by family, friends, and associates to communicate among themselves within a small area?

A

Family radio service (FRS)

64
Q

What channel access method assigns each call a certain portion of time on a designated frequency?

A

Time division multiple access (TDMA)

65
Q

Who is usually responsible for their air time charges and must budget accordingly?

A

Unit

66
Q

Cell sites are generally thought of as being a

A. Square
B. Octagon
C. Hexagon
D. Pentagon

A

C. Hexagon

67
Q

Which conventional LMR device has a transmitting power or 5 or 6 watts?

A. Portable
B. Mobile
C. Repeater
D. Base station

A

A. Portable

68
Q

What conventional LMR device serves as the hub of a net?

A

Base station

69
Q

In trunked LMR systems, different user groups are known as

A

Talk groups

70
Q

Which trunking user equipment has the capability to monitor more than one talk group at a time?

A

Dispatch consoles

71
Q

What enhanced features of the trunking LMR allows the system manager to completely disable radios in the field from the system terminal?

A

Selective radio inhibit

72
Q

In response to disaster relief operations, the DoD Policy on Procurement of Mobile Satellite Services (MSS) was amended in 2006 to allow the DoD to use additional MSS providers for

A

Unclassified purposes within the CONUS

73
Q

What type areas is International Mobile Satellite Organization (Inmarsat) coverage separated into?

A. Geographical
B. Continental
C. Regional
D. Ocean

A

D. Ocean

74
Q

Which Inmarsat system has a land mobile terminal, typically has a one meter flat array antenna, and weights 30 to 40 pounds?

A. B
B. M
C. Aero I
D. Mini-M

A

A. B

75
Q

What are the two basic groups of channel banks?

A

Channel and common equipment units

76
Q

What is the transmission rate, in Mbps, of Mode 3 in channel bank operations?

A. 1.544
B. 2.176
C. 3.153
D. 6.312

A

A. 1.544

77
Q

What function does the line driver unit (LDU) perform for a channel bank unit?

A

Clock generation

78
Q

What type of shelf contains the DC552A channel service unit (CSU)?

A. Modem
B. interface
C. Data store
D. Processor

A

A. Modem

79
Q

What is another name for a stuffing or S-bit in relationship to a channel service unit (CSU)?

A

Framing

80
Q

What component is installed to provide a data set protection against accidental shorts to -52 volts direct current (VDC) analog lines?

A

Line T-1 interface (LTI)

81
Q

What meridian application provides LAN connectivity so you can share equipment, data files, and application software utilizing a modem?

A

CompuCALL

82
Q

Where is the optional supervisory lamp panel for the 291 conference/alerting system usually installed?

A

The master station

83
Q

Which type of equipment modules within the 291 conference/alerting system provide the necessary amplification, ringing, timing, tone supply, and fusing needed for system operation?

A

Internal control

84
Q

The power plant ground supply will not provide

A. Personnel and equipment protection
B. System operation return paths
C. Audio and radio frequency noise sinks
D. Digital signal grounds

A

D. Digital signal grounds

85
Q

Fuse block number 62F14 in a given power distribution enter (PDC) identifies the

A. 15th fuse on the panel in mounting position 62
B. 14th fuse on the panel in mounting position 62
C. 62nd fuse on the panel in mounting position 15
D. 62nd fuse on the panel in mounting position 14

A

A. 15th fuse on the panel in mounting position 62

86
Q

Alarm and control inputs detected by the alarm system hardware are interfaced with the alarm system software through

A. The Meridian trunk module
B. The office alarm unit
C. Scan points
D. Signal points

A

C. Scan points

87
Q

What hardware entity contains the alarm system backup circuits which generate an alarm if the office alarm unit fails?

A

A Meridian trunk module

88
Q

The primary reason you measure the voltage across terminal or distribution frame protectors before removing and replacing them is to

A

Make sure dangerous voltages are not present on the line

89
Q

In addition to fiber optic and copper cables, what do we use to interconnect integrated communications access package access nodes on a deployed base within the same theater area?

A

Microwave and laser

90
Q

What is the design architecture of TDC metropolitan area network?

A

Hub-Spoke

91
Q

What type of connectivity does a voice backbone in the TDC architecture provide?

A. 64 Kbps ISDN basic rate interface (BRI)
B. 64 Kbps ISDN primary rate interface (PRI)
C. 1.544 Mbps ISDN BRI
D. 1.544 Mbps ISDN PRI

A

D. 1.544 Mbps ISDN PRI

92
Q

What equipment is included in a customer access node (CAN) to provide the intersite connectivity?

A

Lightweight multiband satellite terminal (LMST)

93
Q

What major equipment in a TDC package provides mobile units with flexible, lightweight, secure, modular, and integrated deployable communications?

A

LMST and Integrated communications access package (ICAP)

94
Q

What is the long-haul transmission component of TDC?

A

Lightweight multiband satellite terminal (LMST)

95
Q

What’s the difference between the basic access module and the configurable access module?

A

BAM has a fixed capability

96
Q

What ICAP node module provides the radio frequency line-of-site link function for internodal connectivity?

A

Microwave

97
Q

Upon arrival in a theater, what frequency band does the LMST use for initial communications connectivity to the Defense Satellite Communications System (DSCS)?

A

X only

98
Q

What TDC system provides message handling services?

A

Stand-alone message processing system

99
Q

What must customers do to connect telephones and computer workstations to the TDC backbone network?

A

Adhere to various open system standards and interfaces such as ethernet

CDC 3D151 Edit Code 01 (3 decks)

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