Voice Systems Fundamentals Flashcards Preview

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Flashcards in Voice Systems Fundamentals Deck (38):
1

The process of condensation occurs when air particles are

pressurized causing them to move closer together.

2

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

20 to 20,000.

3

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

Amplitude.

4

Noise may be introduced into speech signals by thermal agitation and

black body radiation.

5

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

300 to 3,400.

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?

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

7

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

Meridian System Logic (MSL)–100.

8

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

30,000.

9

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

DS–30A.

10

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

Central control.

11

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

Bay.

12

What contains bays of the same functional equipment?

Frame.

13

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

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

14

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

32.

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)?

16.

16

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

512.

17

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

2.

18

Where are the system clocks located within the SuperNode?

Digital Multiplex System (DMS)-Bus.

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)?

512.

20

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

Dual plane combined core (DPCC).

21

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

The analog signal is band-limited.

22

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

encoding.

23

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

Time division multiplexing.

24

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

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

25

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

frame.

26

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

standard telephone lines.

27

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

User.

28

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

Basic rate interface and primary rate interface.

29

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

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

30

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

actual routing of the signal.

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?

Message transceiver interface.

32

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

verify a dial tone.

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 voice over Internet Protocol (VoIP) session is
established between a private branch exchange (PBX) and another IP host?

Two, one for each direction.

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)?

Gateway.

36

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

Gatekeeper.

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).