Telephone Instruments & Signals

Question 1

The process of conveying information from one place to another

Answer 1

Communication

Question 2

A long distance communications;

‘tele’ Greek word for distant or afar

Answer 2

Telecommunication

Question 3

One of the most remarkable devices ever invented

Answer 3

Telephone

Question 4

Anyone who uses a telephone or data modem on a telephone circuit is part of a global communications network called __

Answer 4

Public telephone network or PTN

Question 5

The PTN is comprised of several vry large corp. and hundreds of smaller independent companies referred to as _____

Answer 5

Telco

Question 6

Inventor of telephone

Answer 6

Alexander Graham Bell and Thomas A Watson

Question 7

Referred to as the Bell Telephone System or “Ma Bell”

Answer 7

AT&T –American Telephone & Telegraph Company

Question 8

World’s most complicated machine

Answer 8

Bell System

Question 9

Simplest and most straightforward form of telephone service

Answer 9

POTS – Plain Old Telephone Service

Question 10

Most fundamental component of a telephone circuit

Answer 10

Local Loop

Question 11

Provides the means to connect telephone set of the subscriber’s location to the closest telephone office

Answer 11

Subscriber Loop

Question 12

Telephone office also called ___

Answer 12

end office
local exchange
central office

Question 13

Enables the subscriber to access the PTN once in the central office

Answer 13

electronic switching system (ESS)

Question 14

An apparatus for reproducing sound, especially that of the human voice (speech) at a great distance by means of electricity; consisting of transmitting & receiving instruments connected by a line or wire which conveys the electric current

Answer 14

Telephone

Question 15

Simple analog transceiver designed for converting speech of acoustical signals to electrical signals

Answer 15

Basic Telephone Set

Question 16

First telephone set that combined a transmitter and receiver into single handheld unit

Answer 16

Butterstamp Telephone (1878)

Question 17

Introduced by western electric company also called the bell system

Answer 17

Rotary Dial Telephone

Question 18

Is called a 2500-type telephone circuit

Answer 18

Touch-tone Telephone

Question 19

Quality of transmission over a telephone connection depends on ___

Answer 19

received volume

Frequency response of the telephone circuit

Degree of the interference

Question 20

Wires on the local loop

Answer 20

Tip (ground) and Ring (-48 Vdc)

Question 21

Third wire to be used in a local loop is called ____

Answer 21

Sleeve

Question 22

A dc voltage is used rather than ac because:

Answer 22

1. to prevent power supply hum
2. to allow service to continue in the event of a power outage
3. people are afraid of ac

Question 23

the only voltage required for the operation of a standard telephone

Answer 23

48 Vdc

Question 24

An Electronic oscilllator used to alert the destination party of the incoming calls

Answer 24

Ringer Circuit

Question 25

Sometimes called switch hook; Simple single throw-double-pole STDP switch

Answer 25

On/Off Hook Circuit

Question 26

Placed across the ‘tip’ and ‘ring’

Answer 26

On/Off Hook Circuit

Question 27

idle, open switch

Answer 27

On Hook

Question 28

in use, closed switch

Answer 28

Off Hook

Question 29

Combination of passive components (resistors & capacitors) Use to regulate the amplitude & frequency response of the voice signals

Answer 29

Equalizer circuit

Question 30

Receiver for the telephone

Answer 30

Speaker

Question 31

Converts electrical signals received from the local loop to acoustical signals (sound waves)

Answer 31

Speaker

Question 32

Transmitter for the telephone

Answer 32

Microphone

Question 33

Converts acoustical signals in the form of sound pressure waves from the caller to electrical signals

Answer 33

Microphone

Question 34

Also called Hybrid coil or duplex coil

Answer 34

Hybrid network

Question 35

A Special balanced transformer used to convert 2-wire (local loop) circuit into 4-wire (telephone set) circuit

Answer 35

Hybrid network

Question 36

Enables the subscriber to output signals representing digits

Answer 36

Dialing Circuit

Question 37

Are acknowledgement & status signals that ensure the processes necessary to set-up and terminate a telephone call are completed in an orderly & timely manner

Answer 37

Call Progress Tones & Signals

Question 38

exchange of signaling message over local loops between stations & tel. company switching machines

Answer 38

Station signaling

Question 39

exchange of signaling message bet. switching machines

Answer 39

Interoffice signaling

Question 40

Indicate request for service

Answer 40

Alerting Signals

Question 41

Provide call status information

Answer 41

Supervising Signals

Question 42

Provide information in the form of announcement

Answer 42

Controlling Signals

Question 43

Provide routing information (calling & called numbers)

Answer 43

Addressing Signals

Question 44

is an audible signal comprised of 2 frequencies – 350 & 440Hz

Answer 44

Dial Tone

Question 45

Each digit is represented by the linear addition of two frequencies

Answer 45

Dual tone multifrequency tones (touch tones)

Question 46

Used to transfer digits & control signals between telephone sets & local switching machines

Answer 46

Dual tone multifrequency tones (touch tones)

Question 47

Combination of two frequencies that fall within the same speech BW so that they can be propagated over the same circuits as voice (in-band signaling)

Answer 47

Multifrequency tones

Question 48

Used to transfer digits and control signals between switching machines

Answer 48

Multifrequency tones

Question 49

Used to indicate the beginning of a sequence of MF digits

Answer 49

KP

Question 50

used to indicate the end sequence of dialed digits

Answer 50

ST

Question 51

Sent from the switching machine back to the calling station whenever the called tel # is off hook 0.5s ON, 0.5s OFF

Answer 51

Station Busy

Question 52

Congestion tone or no circuit available tone 0.2s ON, 0.3s OFF

Answer 52

Equipment Busy

Question 53

20 Hz, 90 Vrms ‘on’ for 2 sec ‘off’ for 4 sec

Answer 53

Ringing Signal

Question 54

440 Hz & 480 Hz ‘on’ for 2 sec ‘off’ for 4 sec

Answer 54

Ring Back

Question 55

Non-Essential Signaling & Call Progress Tones

Answer 55

- Call waiting tones - Hold - Stutter dial tone (for voice mail) - Calling card service tone - Intrusion tones

Question 56

Sound in motion

Answer 56

Speech

Question 57

Acoustic waves or ___ have no electrical component

Answer 57

Sound waves

Question 58

Is an apparatus that creates an exact likeness of sound waves with an electric current

Answer 58

Telephone Set

Question 59

Is a series of telephone connection interfaces (receptacle and plug) that are registered with the US federal communications commission (FCC).

Answer 59

RJ or Registered Jacks

Question 60

Is a method originally used to transfer digits from a telephone set to the local switch. Also called rotary dial pulsing

Answer 60

Dial Pulses

Question 61

Occurs whenever the system is overloaded and more calls are being placed than can be completed

Answer 61

Blocking