S    a:ut_title.comS     O  ͻ  J 	DISK 4  O   ͼ   O       #	Understanding Telecommunications* Which lesson would you like to work on?  A &Lesson 7: Telecommunications Trends	   B A different lesson D A@ Select A or B S        O  ͻ  J 	DISK 4  O   ͼ   O       #	Understanding Telecommunications= This course has 7 lessons, which are divided into 4 disks./ Please type the number of the disk you want:	 	 1 "	Disk 1 - Lesson 1: Introduction
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Lesson 2: Evolution of the Telephone Industry  2 )Disk 2 - Lesson 3: How Telephones Work
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Lesson 4: Making a Connection  3 0Disk 3 - Lesson 5: Business Telephone Systems (Lesson 6: The Private Branch Exchange  4 /Disk 4 - Lesson 7: Telecommunications Trends  9@ Select 1-4 S              H 	DISK 4   #	Understanding TelecommunicationsD If you want to work on a lesson on another disk you will need to: (Press the space bar to exit this disk
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  	   6 Please choose the topic you would like to see next.  A Introduction&' E 	-Unit 4	 	& 	-Toward a Digital Phone System  B 	Unit 1&' F 	-Unit 5 Cellular Mobile Phones&
-The Future  C 	Unit 2&' G -Exit this Lesson Integrating Voice and Data&  D 	Unit 3 Video & Image CommunicationsS    (    C    `    |           This lesson will introduce: 1The new cellular concept for mobile telephonesS 
  	     This lesson will introduce:5    The new cellular concept for mobile telephones
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  This lesson will introduce:5    The new cellular concept for mobile telephones
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The movement toward integrating voice and data information4    Video and image transmission over phone lines 7The increasing digitization of the telephone networkS     This lesson will introduce: 1The new cellular concept for mobile telephones
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8H H $____________oo______________8H H'(H5&R Please open your workbook to Lesson 7, Unit 1.  After you have finished reading2 this material, press the space bar to continue.S 0  0   	    Would you like to:  A %Review key concepts from this Unit	   B #Answer questions about this Unit   C Go on to another Unit S 1  1    3  3         NUntil recently, mobile phone service was expensive and difficult to obtain.OEach call used a separate transmission frequency across a large geographicalKarea.  Since only a limited number of frequencies were available for useKwith mobile phones, anyone who wanted to make a call had to wait until a	channel was available. 
The newcellular radio2concept has reduced the area that a transmitterMcovers so that two people using the same channel can be 10 miles away fromM
each other rather than 100.  Under this concept, service areas are dividedinto regions calledcells5, each of which has its own low-power transmitter,)receiving station, and switching unit.' Do you want to review more material?S 2   0  0    HWhen a phone call is made from a car it is picked up by the receivingLstation and then connected to the public telephone network.  When the carOdrives from one cell to another the call is automatically transferred to the!next cell's receiving station.
 I
In regions where there are few mobile phones, the cells are relativelyOlarge.  As demand grows, the cells can be divided into smaller cells so thatLareas with many mobile phone users will have smaller cells and a capacity
for more users. <Cell sites are interconnected and controlled by a central>Mobil&Telecommunications Switching Office)((MTSO), which is a telephone switching9office with additional equipment for cellular control.# This ends the review for Unit 1.S 0  0   	    True or False?H If a region with a large cell has too many mobile phone users, it canQ
 accommodate them by reducing the size of its cell and adding another receiving station.S 4  4  5  5  That's right, it'strue.8One advantage of cellular radio is that it is easy toQ expand the number of customers that can be served by adding more receiving and transmitting stations.  Do you want another question?S 6  6   0  0   No, it's	true.?One advantage of cellular radio is that it is easy to expandJ the number of customers that can be served by adding more receiving and transmitting stations.  Do you want another question?S 6  6   0  0  H The main concept underlying cellular radio is that the phone company:  A *Multiplexes over the available channels	   B AIncreases the power of the transmitting and receiving stations   C (Reduces the area a transmitter covers S 7  7  8  8  9  9 + Sorry, that's incorrect.  Cellular radio()reduces the area a transmitter coversM so that areas with many users also have many transmitters and receivers to accommodate them.  Do you want another question?S :  :   0  0  S No.  The basic concept behind cellular radio is to decrease rather than increase# the power of transmission.  This(!reduces the area a transmitter coversGin order to accommodate more users.  Do you want another question?S :  :   0  0   Correct!  By*
reducing the area a transmitter covers,5cellular radio is able toM accommodate more customers with a limited number of transmission channels.  Do you want another question?S :  :   0  0   True or False?+ A cell is a circle 10 miles in diameter.S ;  ;  <  <  No, it's		false.BA cell's size is determined by the number of mobile phone users5 in its area, and is also not necessarily a circle.  Do you want another question?S =  =   0  0   Yes, it's	
false.<A cell's size is determined by the number of mobile phone; users in its area, and is also not necessarily a circle.  Do you want another question?S =  =   0  0  M If a car drives from one cell to another while its cellular phone is being used is the call lost?S >  ?  Sorry, the correct answer isno./"When a car travels from one cell to another,N the switching station will automatically transfer the call over to the next; cell's station so that the call continues uninterrupted.  Do you want another question?S @  @   0  0   That's right.=When a car travels from one cell to another, the switchingR station will automatically transfer the call over to the next cell's station so) that the call continues uninterrupted.  Do you want another question?S @  @   0  0   True or False?Q The main reason mobile phones were once difficult to obtain is that there were@
 only a limited number of transmitting and receiving stations.S A  B  Sorry, the correct answer is	false..$Mobile phones were once difficult to obtainJ because there were a limited number of frequency channels available for transmission.& This ends the questions for Unit 1.S 0  0  	    That's right, it's	false..Mobile phones were once difficult to obtainJ because there were a limited number of frequency channels available for transmission.& This ends the questions for Unit 1.S 0  0  	   1_______________________	x  0(H)		x 	
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8H H $____________oo______________8H H'(H5&R Please open your workbook to Lesson 7, Unit 2.  After you have finished reading2 this material, press the space bar to continue.S E  E   	    Would you like to:  A %Review key concepts from this Unit	   B #Answer questions about this Unit   C Go on to another Unit S F  F    I  I         FAs telephones incorporate computer technology and computers utilizeItelecommunications, there is a need for the integration of voice data,	computer data, and video.    Voice data workstations1address this need by combining the features ofNtelephones and microcomputers.  Typically, they are personal computers withIcommunications capabilities built-in, and a separate telephone keypad.' Do you want to review more material?S G  G   E  E    :Voice data workstations typically include sophisticated<speed dialingKcapabilities which allow users to look up names, phone numbers, or otherLinformation in an electronic directory and then have the workstation dial'the number at the touch of a button.
  
Another valuable feature is a
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-system which enables the computerMto act as an answering machine with some extra capabilities.  It digitizesGmessages and stores them, then replays the message for the user uponO
request.  One voice mail system can act for an entire office building and itcan also includeaudio annotation)&which lets a user add audio notes to aNcomputer document or file in order to increase productivity and to simplifycommon tasks.' Do you want to review more material?S H   E  E    MFurthur advances in the integration of voice and data are likely to resultKfrom new technologies used for speech generation and speech recognition.    Speech generation5systems allow a computer to produce speech sounds.=	There are two major technologies for generating speech.  A	?recorded
responseA

is a previously recorded message which has been digitized; theLcomputer finds the appropriate phrase in memory and then plays it back tothe user.  Withsynthesized speech)&, the computer will read and pronounce
text.    Speech recognition8systems enable a computer to understand spoken words.:These systems are still in early stages of development.# This ends the review for Unit 2.S E  E   	   5 A voice data workstation combines the features of:  A $Telephones and answering machines	   B #Computers and answering machines   C Telephones and computers S J  J  K  K  L  L O That's incorrect.  A voice data workstation is a powerful telecommunications& tool which combines the features of$telephones and computers.?It can perform= many tasks which require the combination of these systems.  Do you want another question?S M    E  E   No.GA voice data workstation is a powerful telecommunications tool which combines the features oftelephones and computers.4It can perform many tasks2 which require the combination of these systems.  Do you want another question?S M    E  E  E That's correct.  A voice data workstation combines the features of
Ctelephones and computers@to create a powerful telecommunications tool that can perform many complex tasks.  Do you want another question?S M    E  E  N A voice mail system allows the voice data workstation to take the place of:  A An answering machine	   B A FAX machine   C A telephone directory S N  N  O  O  P  P R That's correct.  The voice mail system allows the voice data workstation to act as a sophisticatedanswering machine.  Do you want another question?S Q  Q   E  E  N Sorry.  FAX machines transmit video images; voice mail systems store spoken7 messages and allow the voice data workstation to act5as an;answering machine.  Do you want another question?S Q  Q   E  E  J Sorry.  While most voice data workstations contain some sort of on-line" directory, this is usually part. of the speed dialing feature.  A voice mail2 system allows the voice data workstation to act0as an6answering machine.  Do you want another question?S Q  Q   E  E  R A system which allows you to add spoken comments to a computer document or file
 is called:	 	 A 	An audio recorder system
   B A recorded response system
   C A voice annotation system S R  R  S  S  T  T  Not quite.  It is thevoice annotation system .that allows you to add verbal notes to computer files.  Do you want another question?S U  U   E  E  K No.  A recorded response system refers to a type of speech synthesis.  AIvoice annotation systemallows you to add verbal+notes to computer files.  Do you want another question?S U  U   E  E   Correct.  Avoice annotation system$allows you to add verbal=notes to computer files.  Do you want another question?S U  U   E  E  R A technology that would be required in a system that allows you to dictate to a computer is called:	 	 A 	Speech recognition
   B Speech generation
   C Speech synthesis S V  V  W  W  X  X ) Good.  A computer would need to have a'speech recognition:system in order toO understand dictation.  Unfortunately these systems are still in development.  Do you want another question?S Y  Y   E  E  N Sorry.  A computer would not need to generate speech in order to understand dictation, but aspeech recognition+$system would be required.  Unfortunately* these systems are still in development.  Do you want another question?S Y  Y   E  E  P Sorry.  A speech synthesis system would produce speech sounds.  To understand dictation, a
speech recognition1 system would be required.  Unfortunately these$ systems are still in development.  Do you want another question?S Y  Y   E  E  F When computers produce speech they use two major techniques called:  A *Speech recognition and speech synthesis	   B *Speech generation and recorded response   C )Speech synthesis and recorded response S Z  Z  [  [  \  \ Q Incorrect.  Speech recognition would be used to understand speech, not produce it.  Both)
speech synthesis and recorded response1can be used by computers to generate speech.  Do you want another question?S ]  ]   E  E  N That's close, but speech generation is the general term which includes both) speech synthesis and recorded response&.  Do you want another question?S ]  ]   E  E   Correct.  Both)speech synthesis and recorded response6can be used by computers to generate speech.  Do you want another question?S ]  ]   E  E   True or False?O The reason speech synthesis is difficult is that computers cannot accurately
 reproduce vocal sounds.S ^  _  Sorry, the correct answer is	false.,%Computers can reproduce vocal sounds, butP have trouble synthesizing speech because spoken words and phonemes vary their' pronunciation in different contexts.& This ends the questions for Unit 2.S E  E  	    That's right, it is	false.3Computers can reproduce vocal sounds.  They haveK trouble synthesizing speech because spoken words and phonemes vary their' pronunciation in different contexts.& This ends the questions for Unit 2.S E  E  	   )*&'p(*%&()*	%  	*
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8H H $____________oo______________8H H'(H5&R Please open your workbook to Lesson 7, Unit 3.  After you have finished reading2 this material, press the space bar to continue.S i  i   	    Would you like to:  A %Review key concepts from this Unit	   B #Answer questions about this Unit   C Go on to another Unit S j  j    n  n         KAlthough Bell Labs sent the first picture over phone lines in 1924, onlyIrecently has this technology advanced to the point where it has becomeJ	practical for businesses to routinely send images over the phone lines. JTypically, images are digitized as a series of 0s and 1s (correspondingHto light and dark areas) and transmitted over digital lines.  Digital%transmission is fast and reliable.' Do you want to review more material?S k  k   i  i    Facsimile orFAX:machines have been used for some time to transmit text,Ographs, charts, pictures, and other printed material.  These devices includeK	a facsimile transmitter and a facsimile receiver.  They communicate withHeach other via the telephone lines or some other transmission medium. LThe transmitter portion of one FAX machine scans the image to be sent andNidentifies its light and dark areas.  Then it digitizes the information and=conveys it to the receiver portion of another FAX machine.' Do you want to review more material?S m   i  i    aaaaaĿ" aaaa&Ŀ) aaaaaaaaaaaa	  a	!' a(S m    GIt is also possible to transmit televised images digitally.  This is
useful forteleconferences,. which are business conferences conducted in8	front of television cameras at two or more locations. JThe technology for televising phone conversations is advancing rapidly.KSince the price of digital and video hardware is continuing to drop, newMproducts for teleconferencing are becoming available with improved picturequality and reduced cost.# This ends the review for Unit 3.S i  i   	   " What are FAX machines used for?  A Television transmission	   B Image transmission   C Teleconferencing S o  o  p  p  q  q K That's incorrect.  FAX machines cannot transmit moving video images as a4 television can.  They are used to transmit static	2images9such as graphs, documents or still pictures.  Do you want another question?S r  r   i  i  < That's correct.  FAX machines are used to transmit static	:imagesAsuch as graphs, documents or still pictures.  Do you want another question?S r  r   i  i  R That's incorrect.  FAX machines cannot transmit motion video, which is required: for teleconferencing.  They are used to transmit static	8images?such as graphs, documents or still pictures.  Do you want another question?S r  r   i  i  9 Are digital phone lines required for FAX transmission?S s  t  Sorry, the answer isno.5A FAX machine can send digital signals over analog4 lines by means of modems, just as a computer can.  Do you want another question?S u  u   i  i   That's right, the answer isno..!A FAX machine can send digital signals over; analog lines by means of modems, just as a computer can.  Do you want another question?S u  u   i  i  5 What is the primary advantage of teleconferencing?  A !It uses inexpensive technology	   B #It is possible over analog lines   C It reduces travel expenses S v  v  w  w  x  x Q That's not right.  Although the cost of teleconferencing hardware continues toR drop, it is by no means inexpensive.  The main advantage of teleconferencing isI that it eliminates the need for employees at various branch offices to	GtravelNto distant cities.  Do you want another question?S y  y   i  i  O That's incorrect.  Teleconferencing generally uses digital phone lines.  TheJ main advantage of telecommunications is that it eliminates the need for) employees at various branch offices to	'travel.to1distant cities.  Do you want another question?S y  y   i  i  P That's correct.  The main advantage of teleconferencing is that it eliminates6 the need for employees at various branch offices to	4travel;to>distant cities.  Do you want another question?S y  y   i  i   True or False?S Because of the nature of current technology, all FAX equipment sends informationC
 at basically the same speed, and with the same document quality.S z  {  Sorry, that's	false.=Transmission speed and document quality vary considerably,P depending on the equipment, the type of multiplexer used, and the capacity of the transmission lines.& This ends the questions for Unit 3.S i  i  	    That's right it's	false./Transmission speed and document quality varyR considerably, depending on the equipment, the type of multiplexer used, and the& capacity of the transmission lines.& This ends the questions for Unit 3.S i  i  	   2                                           4                                             6                                               6                                               4	                                             2
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                           L This Unit describes how telephone networks increasingly are using digitalS technology to reduce the cost and improve the quality of telephone transmission.S }   
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8H H $____________oo______________8H H'(H5&R Please open your workbook to Lesson 7, Unit 4.  After you have finished reading2 this material, press the space bar to continue.S      	    Would you like to:  A %Review key concepts from this Unit	   B #Answer questions about this Unit   C Go on to another Unit S                  NA number of trends seem to be leading toward a telephone system that relies;increasingly on digital rather than analog transmission.
 D
These trends include the increasing importance and volume of dataKtransmission, the value of integrating voice and data communication, andDthe high information demands of media such as video transmission.' Do you want to review more material?S          NDigital transmission has certain technical advantages over the older analogapproach.
 I
To be transmitted over long distances, analog signals require frequentNamplification.  This produces distortion, and thus a loss of quality in the
signal. LDigital transmission uses repeaters which regenerate the signal, and thuspreserve its original form.' Do you want to review more material?S          NA key issue for the efficiency of digital telephone systems is the speed oftransmission.
 
Speed is measured in
baud rate
", or bits per second (bps).

    ModemsH
convert computer data at standard speeds for transmission over analog5lines (such as 300 baud, 1200 baud, or 9600 baud).' Do you want to review more material?S          IPBX modems usually transmit at a much higher rate of 19.2 kilobits persecond (19200 baud). N19.2KBs is the fastest rate possible for many computer transmissions, sinceM	it is the maximum rate for computers which are connected to phone lines by
means of standard circuits. IIf a computer installation has more sophisticated switching equipment,K
normal phone wires and the internal circuitry of the PBX can transmit atfaster speeds.' Do you want to review more material?S          LWith rates this fast, the physical limitations of the transmission medium$begin to become a serious matter.	    T1 carriers<	are channels which can transmit digital data at a rate of
1,544,000 bits per second.
    T45 carriers>
transmit at 45,000,000 bits per second.  This is equivalentto 28 T1 lines. NThese channels may be transmitted on wire, microwave, fiber-optic cable, orother transmission media.' Do you want to review more material?S             Bypass systems;circumvent the local phone system by sending informationIthrough alternative routes such as microwave transmitters, fiber-optic%	cables, and even cable television. KThere are two major reasons companies turn to bypass systems:  to reduce$costs and to improve performance.' Do you want to review more material?S          NOne type of bypass system simply consists of a private line which is leasedLfrom the local phone company.  The rates are lower than they would be forM	other telephone lines because a private line is permanently connected to a=long distance service, and there are no switching charges. KAnother reason for using bypass systems is to bring high-quality digital+lines directly into a place of business.' Do you want to review more material?S          KA tremendous amount of "rewiring" is now going on, particularly in urbanNareas with a high concentration of businesses.  The transmission medium forH	these new digitized local loops often consists of fiber-optic cables. LThe speed of transmission possible with fiber-optic circuitry dwarfs thatLfor traditional wire connections.  Cables now in operation often transmit;at a rate of 400 Megabits (400,000,000 bits) per second.' Do you want to review more material?S          CHigh-capacity fiber-optic cables will also play a key role in an&Integrated Services Digital Network', or,ISDN.
 
ISDNF
	is a proposed set of standards for a digital communications network8that can transmit voice, data, and image information. MThe network will be designed to eliminate the problems currently caused byCdifferent products which use different communications standards.# This ends the review for Unit 4.S      	    True or False?R A number of trends indicate that the telephone system will increasingly rely on%
 analog transmission in the future.S         No, the correct answer isfalse/.  A number of trends such as the increasingP importance and volume of data transmission and the value of integrating voiceM and data communications seem to be leading in the direction of a telephoneO system which increasingly relies on digital rather than analog transmission.  Do you want another question?S           That's right, it isfalse:.  A number of trends such as the increasing importanceN and volume of data transmission and the value of integrating voice and dataQ communications seem to be leading in the direction of a telephone system whichB increasingly relies on digital rather than analog transmission.  Do you want another question?S          I When you make a long distance call, can you tell whether your call was, transmitted over analog or digital lines?S    R Sorry, the answer is probably not.  Usually you will not be able to distinguishQ between analog and digital transmission.  In fact, both technologies are often" used to complete the same call.  Do you want another question?S          P That's correct, the answer is probably not.  Usually, you will not be able toS distinguish between analog and digital transmission.  In fact, both technologies, are often used to complete the same call.  Do you want another question?S          - Which rate of transmission is the slowest?  A 300 baud	   B 19.2 kilobits per second   C 400 megabits per second S            N That's the correct answer.  300 baud or 300 bps is the speed of the slowestP modems.  19.2 kilobits per second is 19200 bps, the maximum rate for computerP transmission through standard circuits.  This is far faster than 300 bps, but; considerably slower than 400 megabits (400,000,000 bps).  Do you want another question?S          Q Sorry, that's not it.  19.2 Kbps (19200 bps), is the maximum rate for computerS transmission through standard circuits.  This is far faster than 300 baud or 300N bps, and considerably slower than 400 megabits (400,000,000 bps) which is a6 common transmission speed over a fiber-optic cable.  Do you want another question?S          N Sorry, that's not it.  400 megabits (400,000,000 bps) is a common speed for) transmission over a fiber-optic cable.%(This is faster than both 19.2 KbpsM (19,200 bps is the maximum rate for computer transmission through standard circuits)1
and 300 bps (the speed of the slowest modems).  Do you want another question?S          Q New digital network standards being designed to eliminate problems caused by a1 variety of communication standards are called:	 	 A 	ISDN
   B DID
   C DTMF S            = That's correct.  The Integrated Services Digital Network (:ISDN>) is a set ofK digital communications standards for transmitting voice, data, and image information.  Do you want another question?S           That's not it.ADID stands for direct inward dialing.  The Integrated Services Digital Network (ISDN5) is a set of digital communications standards for3 transmitting voice, data, and image information.  Do you want another question?S           That's incorrect.<DTMF stands for dual-tone multifrequency.  The Integrated Services Digital Network (ISDN1) is a set of digital communications standards7 for transmitting voice, data, and image information.  Do you want another question?S          I Which term refers to systems that circumvent the local phone circuits?  A Fiber optics	   B 	Bypass   C T1 carriers S             Sorry, the correct answer isbypass system.!-Although these may be based onM fiber-optic cables, they could also consist of microwave, wire, or another distribution system.  Do you want another question?S            That's right, they are called	bypass%systems."/These may consist of microwave,- wire, or fiber-optic transmission systems.  Do you want another question?S           Sorry, the correct answer is	bypass$systems.!.T1 carriers are channels whichR transmit digital data at a rate of 1,544,000 bps.  Although some bypass systems& involve T1 carriers, others do not.  Do you want another question?S           True or False?S T1 carriers are special fiber-optic cables which transmit digital data at a rate
 of 1,544,000 bps.S        ? Sorry, but this was a tough question.  The correct answer is	=false.ET1 carriersN are indeed channels which transmit digital data at a rate of 1,544,000 bps.Q However, the transmission medium is not necessarily fiber-optic cable; many T1+ carriers are wire or microwave channels.  Do you want another question?S           Good!T1 carriers?are indeed channels which transmit digital data at a rate ofR 1,544,000 bps.  However, the transmission medium is not necessarily fiber-optic: cable; many T1 carriers are wire or microwave channels.  Do you want another question?S          K Which transmission medium is now being widely used to "rewire" telephone: circuits to provide higher volume digital transmission?	 	 A 	Fiber-optic cables
   B Satellite transmission
   C T1 carriers S            , That's correct.  In the 1980s the cost of*fiber-optic cable<dropped rapidly& while its sophistication increased.  Do you want another question?S          5 Sorry, that's not right.  In the 1980s the cost of3fiber-optic cable
EdroppedS rapidly while its sophistication increased.  This became the transmission medium1 of choice for rewiring many telephone systems.  Do you want another question?S          S That's not it.  T1 carriers are channels that transmit digital data at a rate of 1,544,000 bps.In the 1980s the cost of)fiber-optic cable;dropped rapidly& while its sophistication increased.)%This became the transmission medium of. choice for rewiring many telephone systems.  Do you want another question?S           True or False?S The only reason bypass systems are becoming more popular is that they can reduce(
 telephone costs for large businesses.S         Sorry, the correct answer is	false..%Although reduced cost is one reason for theQ popularity of bypass systems, in many cases bypass systems have been installedK to improve performance by providing access to digital lines or to give a* business more control over its network.  Do you want another question?S            That's correct, the answer is	false.*&Although reduced cost is one reason forK the popularity of bypass systems, in many cases bypass systems have beenN installed to improve performance by providing access to digital lines or to1 give a business more control over its network.  Do you want another question?S           True or False?P Computer data can be sent digitally at a slower rate than voice conversations
 can.S     That's right, the answer istrue.0#Because of the complexity of the human voice,N telephone conversations are typically transmitted at a rate of 64,000 baud.Q Computer information is often transmitted at much lower rates, such as 300 and
 1200 baud.& This ends the questions for Unit 4.S     	    Sorry, the answer istrue.0Because of the complexity of the human voice,N telephone conversations are typically transmitted at a rate of 64,000 baud.Q Computer information is often transmitted at much lower rates, such as 300 and
 1200 baud.& This ends the questions for Unit 4.S     	   $?#/%\"/&\!/'\)	 /	(\	)
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8H H $____________oo______________8H H'(H5&R Please open your workbook to Lesson 7, Unit 5.  After you have finished reading2 this material, press the space bar to continue.S      	   Q Since the written material for Unit 5 summarizes some possible scenarios whichQ may occur in the future, this Unit has no factual review screens or questions.J
 This is the last Unit in the Basic Telecommunications course.  Have you completed every other Unit?S           P Congratulations on completing the course.  We hope that you have enjoyed thisS introduction to the world of telecommunications, and that the knowledge you have' gained will be helpful in your work.
 Would you like to:
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Exit this course   B 4Return to the Lesson menu to review more material S           O  ͻ  J 	LESSON 7  O   ͼ   O       	Unit MenuS    J 	LESSON 7   "	Unit 1 - Cellular Mobile PhonesS    O  ͻ  J 	LESSON 7  O   ͼ   O       "	Unit 1 - Cellular Mobile PhonesS    O/ @ O\_/ @ O\_J 	LESSON 7  O\_/@O\_/@ O/@O\_/@O\_"	Unit 1 - Cellular Mobile PhonesS    J 	LESSON 7   &	Unit 2 - Integrating Voice and DataS    O  ͻ  J 	LESSON 7  O   ͼ   O       &	Unit 2 - Integrating Voice and DataS    @ / \   /J 	LESSON 7  @/   \_/  @ 
O1 0 1 1&	Unit 2 - Integrating Voice and DataS    J 	LESSON 7   *	Unit 3 - Video and Image CommunicationsS    O  ͻ  J 	LESSON 7  O   ͼ   O       *	Unit 3 - Video and Image CommunicationsS    @ĿJ 	LESSON 7  @	O@ @/____\	Unit 3 -!Video and Image CommunicationsS    J 	LESSON 7   )	Unit 4 - Toward a Digital Phone SystemS    O  ͻ  J 	LESSON 7  O   ͼ   O       )	Unit 4 - Toward a Digital Phone SystemS    @Ŀ ĿJ 	LESSON 7  @    @ 
O1 0 1 1)	Unit 4 - Toward a Digital Phone SystemS    J 	LESSON 7   	Unit 5 - The FutureS    O  ͻ  J 	LESSON 7  O   ͼ   O       	Unit 5 - The FutureS   ĿJ 	LESSON 7 	Unit 5 - The FutureS  F @CG D@PressIG 	J@space S  D @AG 	B@SelectHG I@YJG K@orMG N@N S  D @AG 	B@SelectHG I@TJG K@orMG N@FOG S  S @ Select A-C S  D @AG 	B@SelectHG I@AJG K@orMG N@BOG S  G @DG 	E@SelectKG L@1-3 S  G @DG 	E@SelectKG L@1-4OG S  G @DG 	E@SelectKG L@1-5OG S  G @DG 	E@SelectKG L@1-6OG S  G @DG 	E@SelectKG L@1-7OG S  G @DG 	E@SelectKG L@1-8OG S  G @DG 	E@SelectKG L@1-9OG S  G @DG 	E@SelectKG L@A-GOG S  G @DG 	E@SelectKG L@A-DOG S  G @DG 	E@SelectKG L@A-EOG S  G @DG 	E@SelectKG L@A-F S  G @DG 	E@SelectKG L@A-HOG S  S  S  S  S  S  S  S  S  