Volume 2 Flashcards
(100 cards)
0
Q
In hertz (Hz), what range of sound can the human ear detect?
A
20 to 20,000
1
Q
The process of condensation occurs when air particles are
A
Pressurized causing them to move closer together
2
Q
The loudness of a sound is closely related to what part of the sine wave?
A
Amplitude
3
Q
Noise may be introduced into speech signals by thermal agitation and
A
Black body radiation
4
Q
In hertz (Hz), what is the actual voice frequency band?
A
300 to 3,400
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
6
Q
Which model of Digital Multiplex System (DMS)-100 family switches is installed in compact modular cabinets?
A
Meridian System Logic (MSL)-100
7
Q
What is the maximum number of ports that a Meridian system logic (MSL)-100 will support?
A
30,000
8
Q
Which type link is normally used to interconnect two peripheral modules (PM) in the Digital Multiplex System (DMS)?
A
DS-30A
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
10
Q
What is the mounting bracket called on which transmission or switching equipment is mounted in a Digital Multiplex System (DMS)?
A
Bay
11
Q
What contains bays of the same functional equipment?
A
Frame
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)
13
Q
How many channels of data does each digital signal (DS) 30 speech link carry?
A
32
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
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
16
Q
How many inter message switch links (IMSL) can be configured in a supernode?
A
2
17
Q
Where are the system clocks located within the SuperNode?
A
Digital Multiplex System (DMS)-Bus
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
19
Q
Where are the DMS-Core and DMS-Bus housed?
A
Dual plane combined core (DPCC)
20
Q
What is the first step in the pulse code modulation (PCM) process?
A
The analog signal is band-limited
21
Q
In the pulse code modulation (PCM) process, changing the quantized samples into a binary word is called
A
Encoding
22
Q
What is a method of putting many users on a single cable pair?
A
Time division multiplexing
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
24
Each 125 microsecond time period in the digital signal (DS) 30 signaling format (used within the voice network system) is called a
Frame
25
ISDN can combine voice and data services over the same wires because it uses
Standard telephone lines
26
What type of information is transmitted on a ISDN B channel?
User
27
What are the two major established ISDN transmission rates?
Bearer rate interface and primary rate interface
28
What is the ISDN R interface?
Connection point between a non-ISDN compatible device and a terminal adapter (TA)
29
The network layer of the OSI model provides the
Actual routing of the signal
30
What circuit board in the REDCOM switch provides two signaling channels and is only necessary when interfacing with an ISDN-capable switch?
Message transceiver interface
31
One of the main purposes of the ISDN handset telephone test set is to
Verify a dial tone
32
What is the frame rate in feet per second (FPS) for transmitting video teleconferencing data on the ISDN?
30 FPS
33
What component in the video teleconferencing (VTC) system converts analog signals to digital signals?
Coder/decoder (CODEC)
34
How many channels are used when a VoIP session is established between a private branch exchange (PBX) and another IP host?
2, one for each direction
35
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?
Gateway
36
What component of VoIP provides call management functions in a defined local area called a zone?
Gate keeper
37
How many milliseconds should the one way delay be from endpoint to endpoint in order to implement voice over Internet protocol (VoIP)?
Less than 150
38
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?
Phase-locked loop (PLL)
39
What are frequencies from 30 to 300 MHz internationally designated as?
Very high
40
The ultrahigh frequency designation applies to frequencies from
300 to 3000 MHz
41
Which of the following frequencies has the shortest wavelength?
A. 14 kHz
B. 1.4 MHz
C. 14 MHz
D. 140 MHz
D. 140 MHz
42
A mode of operation in which communication is possible between two or more stations, in both directions, using the same frequency, is called
Simplex
43
What communication mode(s) of operation allows two or more stations to send intelligence in both directions but not simultaneously?
Simplex and half duplex
44
Producing radio frequency energy and radiating useful signals into space is the purpose of the
Transmitter
45
What type of modulation produces a constant amplitude transmission?
Frequency
46
The ability to maintain a constant output carrier frequency refers to a transmitter's frequency
Accuracy
47
The process of mixing or combining two frequencies in a nonlinear device in an amplitude modulated (AM) receiver is called
Heterodyning
48
What components of a frequency modulated (FM) receiver removes the original signal from the sidebands and re-creates the audio intelligence?
Discriminator
49
What characteristic enables a receiver to reproduce a desired signal from several closely spaced stations or from interfering frequencies?
Selectivity
50
The total resistive properties of a circuit when resistance, capacitive reactance, and inductive reactance are formulated together is called
Impedance
51
What transmission line is very common in both fixed and tactical application?
Flexible coax
52
What field provides the basis of RF communications by detaching from the conductor and traveling through space?
Radiation
53
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
D. And receiving antenna should have the same polarization
54
What standard antenna is used for antenna gain comparison?
Isotropic
55
When the gain of an anisotropic radiator is compared to the isotropic radiator, the stronger signal of the directional antenna is expressed as
Decibels (dB) gain
56
What is the shortest wavelength an antenna can be made resonant?
Half
57
What tuning devices are adjusted when tuning the resonant transmission line-resonant antenna connection?
Inductors and capacitors
58
What limits a direct wave to normally less than 20 miles?
Curvature of the earth
59
Which type of precipitation attenuates RF energy just like rain?
Fog
60
What ratio is used to measure the desired signal strength relative to the background noise?
Signal-to-noise
61
What combination of AFIs do you use for guidance when determining a technical solution for PWCS?
AFI 33-106 and AFI 33-201V1
62
Which PWCS device can be used for command and control?
Land mobile radio
63
Which PWCS device's original intent was for use by family, friends, and associates to communicate among themselves within a small area?
Family radio service (FRS)
64
What channel access method assigns each call a certain portion of time on a designated frequency?
Time division multiple access (TDMA)
65
Who is usually responsible for their air time charges and must budget accordingly?
Unit
66
Cell sites are generally thought of as being a
A. Square
B. Octagon
C. Hexagon
D. Pentagon
C. Hexagon
67
Which conventional LMR device has a transmitting power or 5 or 6 watts?
A. Portable
B. Mobile
C. Repeater
D. Base station
A. Portable
68
What conventional LMR device serves as the hub of a net?
Base station
69
In trunked LMR systems, different user groups are known as
Talk groups
70
Which trunking user equipment has the capability to monitor more than one talk group at a time?
Dispatch consoles
71
What enhanced features of the trunking LMR allows the system manager to completely disable radios in the field from the system terminal?
Selective radio inhibit
72
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
Unclassified purposes within the CONUS
73
What type areas is International Mobile Satellite Organization (Inmarsat) coverage separated into?
A. Geographical
B. Continental
C. Regional
D. Ocean
D. Ocean
74
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. B
75
What are the two basic groups of channel banks?
Channel and common equipment units
76
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. 1.544
77
What function does the line driver unit (LDU) perform for a channel bank unit?
Clock generation
78
What type of shelf contains the DC552A channel service unit (CSU)?
A. Modem
B. interface
C. Data store
D. Processor
A. Modem
79
What is another name for a stuffing or S-bit in relationship to a channel service unit (CSU)?
Framing
80
What component is installed to provide a data set protection against accidental shorts to -52 volts direct current (VDC) analog lines?
Line T-1 interface (LTI)
81
What meridian application provides LAN connectivity so you can share equipment, data files, and application software utilizing a modem?
CompuCALL
82
Where is the optional supervisory lamp panel for the 291 conference/alerting system usually installed?
The master station
83
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?
Internal control
84
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
D. Digital signal grounds
85
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. 15th fuse on the panel in mounting position 62
86
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
C. Scan points
87
What hardware entity contains the alarm system backup circuits which generate an alarm if the office alarm unit fails?
A Meridian trunk module
88
The primary reason you measure the voltage across terminal or distribution frame protectors before removing and replacing them is to
Make sure dangerous voltages are not present on the line
89
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?
Microwave and laser
90
What is the design architecture of TDC metropolitan area network?
Hub-Spoke
91
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
D. 1.544 Mbps ISDN PRI
92
What equipment is included in a customer access node (CAN) to provide the intersite connectivity?
Lightweight multiband satellite terminal (LMST)
93
What major equipment in a TDC package provides mobile units with flexible, lightweight, secure, modular, and integrated deployable communications?
LMST and Integrated communications access package (ICAP)
94
What is the long-haul transmission component of TDC?
Lightweight multiband satellite terminal (LMST)
95
What's the difference between the basic access module and the configurable access module?
BAM has a fixed capability
96
What ICAP node module provides the radio frequency line-of-site link function for internodal connectivity?
Microwave
97
Upon arrival in a theater, what frequency band does the LMST use for initial communications connectivity to the Defense Satellite Communications System (DSCS)?
X only
98
What TDC system provides message handling services?
Stand-alone message processing system
99
What must customers do to connect telephones and computer workstations to the TDC backbone network?
Adhere to various open system standards and interfaces such as ethernet
