TELEPHONE INSTRUMENTS AND SIGNALS (C16 Tomasi)

CHAPTER 16

TELEPHONE INSTRUMENTS AND SIGNALS

1)Process of conveying information from one place to another.

Communications

2)Is a long-distance communications

Telecommunications

3)One of the most remarkable devices ever invented.

Telephone

4)Anyone who uses a telephone or a data modem on a telephone circuit is part of a global communications network .

Public Telephone Network

5)The PTN is comprised of several very large corporations and hundreds of smaller independent companies jointly.

Telco

6)The telephone system as we know it today began as an unlikely collaboration of two men with widely disparate personalities:

Alexander Graham Bell and Thomas A. Watson

7)The simplest and most straightforward form of telephone service.

Plain Old Telephone Service

8)Most fundamental component of a telephone circuit.

Subscriber Loop or Local Loop

9)An unshielded trwisted-pair transmission line consisting of two insulated conductors twisted together

Local Loop

10)Comes from the Greek word "tele" meaning from afar and phone, meaning sound, voice, or voiced sound.

Telephone

11)The first telephone set that combined a transmitter and receiver into a single handheld unit was introduced in 1878

Butterstamp Telephone

12)Helps prevent the speaker from talking too loudly

Sidetone or Talkback

13)The pair of wores connecting.

Local Loop

14)A series of telephone connection interfaces that are registered with the U.S. Federal Communications Commission.

RJ or Registered Jacks

15)The most common telephone jack in use today and can have up to six conductors.

RJ-11

16)An apparatus that creates an exact likeness of sound waves with an electric current.

Telephone Set

17)Is originally an electromagnetic bell, placed directly across the tip of the ring of the local loop.

Ringer Circuit

18)Purpose of a Ringer.

Alert the destination party of incoming calls

19)Sometimes called a Switch Hook.

On/Off Hook Circuit

20)Helps solve an important transmission problem in telephone set design.

Equalizers

21)Is the transmitter of the telephone.

Microphone

22)Converts acoustical signals in the form of sound pressure waves from the caller to electrical signals that are transmitted into the telephone network.

Microphone

23)Enables the subscriber to output signals representing digits.

Dialing Circuit

24)Signaling messages can be subdivided further into one or four categories:

Alerting, Supervising, Controlling, and Addressing

25)Indicate a request for service.

Alerting Signals

26)Provide call status information.

Supervising Signals

27)Provide information in the form of announcements.

Controlling Signals

28)Provide the routing information.

Addressing Signals

29)Is strictly for signaling between a subscriber's location and the nearest telephone office or message switching center.

DTMF

30)Are used to transfer digits and control signals between switching machines.

Multifrequency Tones

31)Are combinations of two frequencies that fall within the normal speech bandwidth so they can be propagated over the same circuits as voice.

MF Tones

32)Equipment Busy Signal is sometimes.

Congestion Tone or No-Circuit-Available

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

Blocking

34)Is sent from a central office to a subscriber whenever there is an incoming call.

Ringing signal

35)Telephones that operate with out the cords attached to the handset.

Cordless Telephones

36)Relay radio signals and messages from wire line and cellular telephones to subscribers carrying portable receivers.

Paging Transmitters