Voice Systems Fundamentals

Question 1

The process of condensation occurs when air particles are

Answer 1

pressurized causing them to move closer together.

Question 2

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

Answer 2

20 to 20,000.

Question 3

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

Answer 3

Amplitude.

Question 4

Noise may be introduced into speech signals by thermal agitation and

Answer 4

black body radiation.

Question 5

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

Answer 5

300 to 3,400.

Question 6

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

Answer 6

DMS–100 and Meridian System Logic (MSL)–100.

Question 7

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

Answer 7

Meridian System Logic (MSL)–100.

Question 8

What is the maximum number of ports that a Meridian System Logic (MSL)–100 will
support?

Answer 8

30,000.

Question 9

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

Answer 9

DS–30A.

Question 10

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

Answer 10

Central control.

Question 11

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

Answer 11

Bay.

Question 12

What contains bays of the same functional equipment?

Answer 12

Frame.

Question 13

Which Digital Multiplex System (DMS) component uses 16–bit Motorola 68000 or 8bit
Intel microprocessors?

Answer 13

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

Question 14

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

Answer 14

32.

Question 15

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

Answer 15

16.

Question 16

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

Answer 16

512.

Question 17

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

Answer 17

2.

Question 18

Where are the system clocks located within the SuperNode?

Answer 18

Digital Multiplex System (DMS)-Bus.

Question 19

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)?

Answer 19

512.

Question 20

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

Answer 20

Dual plane combined core (DPCC).

Question 21

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

Answer 21

The analog signal is band-limited.

Question 22

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

Answer 22

encoding.

Question 23

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

Answer 23

Time division multiplexing.

Question 24

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

Answer 24

the highest frequency sampled multiplied by the sampling rate per cycle.

Question 25

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

Answer 25

frame.

Question 26

Integrated Services Digital Network (ISDN) can combine voice and data services over the
same wires because it uses

Answer 26

standard telephone lines.

Question 27

What type of information is transmitted on a Integrated Services Digital Network (ISDN) B
channel?

Answer 27

User.

Question 28

What are the two major established Integrated Services Digital Network (ISDN)
transmission rates?

Answer 28

Basic rate interface and primary rate interface.

Question 29

What is the Integrated Services Digital Network (ISDN) R interface?

Answer 29

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

Question 30

The Network Layer of the Open Systems Interconnection (OSI) model provides the

Answer 30

actual routing of the signal.

Question 31

What circuit board in the REDCOM switch provides two signaling channels and is only
necessary when interfacing with an Integrated Services Digital Network (ISDN)-capable switch?

Answer 31

Message transceiver interface.

Question 32

One of the main purposes of the Integrated Services Digital Network (ISDN) handset
telephone test set is to

Answer 32

verify a dial tone.

Question 33

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

Answer 33

Coder/decoder (CODEC).

Question 34

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

Answer 34

Two, one for each direction.

Question 35

What component of voice over Internet Protocol (VoIP) is an endpoint on the network that
provides real time, bi-directional communications between H.323 terminals and other switch
circuit networks (SCN)?

Answer 35

Gateway.

Question 36

What component of voice over Internet Protocol (VoIP) provides call management
functions in a defined local area called a zone?

Answer 36

Gatekeeper.

Question 37

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

Answer 37

Less than 150.

Question 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?

Answer 38

Phase-locked loop (PLL).