Part 1: Introduction to Data, Voice, and Video Cabling

 

 

 

Chapter 1 – The history of telecommunications

 

1. What prompted the development of the telegraph?

@The discovery of the principle of electromagnetism and the invention of the electric cell, now called the battery.

 

2. For what was Samuel Morse better known than the invention of the telegraph?

@Portrait painting

 

3. Who missed the patent for the telephone by being few hours later than Alexander Graham Bell?

@Elisha Gray

 

4. What was the original name for radio that is now used for all forms of radio communications:

@Mechnical scanners

 

5. What electronic components characterized first-, second-, and third-generation ocmputers?

@1^st=Vacuum tube;   2^nd=transistor    3^rd=Integrated circuit

 

6. Ethernet, the most popular computer network, was invented at a company known for something entirely different.  What company was it?

@Bob Metcalfe at Palo Alto Research Center in early 1970s starting with a drawing on a napkin.

 

 

Chapter 2 – The technology of communications

 

1. Modern telephones operate on essentially the same principles that were developed 100 years ago. T or F

@True

 

2. What type of circuit (parallel or series) does a phone operate under?

@Parallel

 

3. What is the bandwidth of telephone signals?

@3,000 hertz (cycles per second)

 

4. What machine is similar to a black-and-white television?

@Fax machine

 

5. How much bandwidth does a standard TV channel use?

@6 Mhz (millions of cycles per second)

 

6. What was the first name given to the type of cable capable of transmitting high-speed signals with adequate low loss?

@Coax

 

7. List the four parts of a coaxial cable.

@Jacket, Shield, Dielectric, Conductor

 

8. If the coax cable is not terminated at both ends, what type of problem might you use?

@Reflections that can cause interference

 

9. In a “tree-and-branch” system, what happens to everyone downstream from a failed amplifier?

@Service is lost to all downstream customers

 

10. Using a coax cable capable of carrying a 1 GHz bandwidth, how many channels can you expect in your home?

@100 or more channels of video programming

 

11. What is the advantage of networking computers?

@The purpose of networking is to allow a number of computers to generate together, sharing information and allowing the operator of one computer to read and use programs in another computer

 

12. What signals does a digital transmission system transmit?  What signals are transmitted by analog system?

@Digital transmission system transmit “One and Zeroes”                                                                                                                                                                               

Analog transmission system transmit “Continuously varying signals”

 

13. What type of transmission network is today’s TV?

@Analog

 

14. What is the vital line between the processor and the network?
1. Your hands and voice
2. Pin configuration of the computers

C.    @Network interface card

D.    Network interaction class

 

15. The central computer in a network is usually called the ______________.

@Server or file server

 

16. Name the three most common methods of connecting all the computers in a network.

@1=Star;    2=Ring;    3=Bus

 

 

17. What is the center of a star network?

@File server, Main computer, or a hub or switch, Central computer

 

18. Which is the most common cable used for desktop connections in local area networks

(LANs)?

@UTP cable

 

19. What adapter would be needed for connecting hardware from an old cable plant to a newer cable plant using a UTP cable?

@Baluns

 

20. What does Fiber Distributed Data Interface (FDDI) use to provide fault tolerance in case of failure?

@Dual counter-rotating rings

 

21. What type of transmission produces an output as a sum of both signals?

@Balanced Pair Transmission

 

22. Since most networks use two of the four pairs, why is it not possible to use the other two pairs for LAN connection?

@Because of possible crosstalk problems

 

23. What networking topology is specified by the EIA/TIA 568 standards?

@Physical star

 

Chapter 3 – Overview of wiring installations

 

1. What mandatory standards establishes safety standards for installation fo cable?

@EIA/TIA 568 Standards

 

2. What must you keep copper signal cables away fram?

@Power cables; flourescent lights; electric motors; and other sources of electro magnetic interference

 

3. What are the most common pieces of telecom equipment?

@Telephone; punchdown blocks; wall jacks and connection modules; equipment racks & central consoles

 

4. What kinds of CCTV equipment might you be mounting?

@Camera and mountings, monitors, equipment, antennas, satellite receivers

 

5. List seven components of computer networks.
1. personal computers
2. computer cards
3. minicomputers and small mainframes,
4. hubs, multiplexers, routers
5. peripheral devices,
6. large central units,
7. software

 

6. When wiring telecom projects, what is more important than getting the job done on time and to get paid?

@Getting the job done right.

 

7. What is the bottom line in installation quality?

@Signal quality and strength from one end of the network to the other

 

 

Chapter 4 –Structured cabling

 

1. What type of copper cable has become the standards in the LAN marketplace?

@UTP

 

2. List the issues that standards must address.
1. component standard
2. network standard
3. installation standard
4. standard test methods
5. good caliberation standards

 

3. What is the most quoted standard in communication cabling?

@EIA/TIA 568

 

4. What are, in most locales, the mandatory standards for cabling?

@Only NEC (National Electrical Code) for flammability and grounding and FCC rules on the emission of interfering signals are legally required

 

5. Who developed the 568 standards (manufacturers or users)?

@Manufacturers, who cooperated to ensure interoperability of their respective products

 

6. Name the three locations where the switches, hubs, and other networking equipment are located.
1. MCC (main cross-connect)
2. ICC (intermediate-connect)
3. equipment room

 

7. What three cables are used in the backbone?
1. UTP
2. cable
3. multimode or singlemode optical fiber

 

8. What was the distance of the UTP wiring with the design of 568, in feet and meters?

@295 ft;  90 meters

 

9. What is normally run as the connection from the telecom closet to the work area or desktop?

@Horizontal cabling

 

10. What components were made identical under the standardization of components from the EIA/TIA 568?

@All connectors, jacks, cables, and punchdowns

 

11. What colors, combined with white, identify the four pairs of UTP cable?

@Orange, Green, Blue, Brown

 

12. Who originally developed cable performance levels?

@Anixter

 

13. What do the new Level 5, Level 6, and Level 7 cables have in common?

@Upgrading of cable alone is not going to provide higher bandwidth performance

 

14. What determines the frequency performance of the cable?

@The frequency performance of the cable is mostly determined by the twists in the pairs and the type of insulation used on the wire.

 

15. What is the common mating plug or jack usually called instead of its proper name-modular 8-pin connector?

@RJ-45

 

16. Which pairs of wires are reversed in the 568A and 568B wire scheme?

@Transimitter and receiver must cross in the cable to allow direct connection

 

17. How much can a pair in UTP Cat 5 be untwisted before you fail crosstalk tests?

@Half (½ )inch

 

18. What is the most popular punchdowns used for LANs?

@The 110

 

19. What type of block is typically used with jacks or a patch panel?

@The 100 block

 

20. What allows older product designs to still be used in UTP-structured cabling systems, and  what does this product do?

@Baluns (Balanced Unbalanced Function)

They offer: 1) Converting balanced to unbalanced transmission

                   2) Matching impedance

                   3) Converting connector types

Baluns are offered to adapt most networks to run on UTP cabling and even to allow hardware designed to run on UTP to use other installed cable types available at a  given location.

 

21. What optical fibers are allowed in 568 structured cabling system?

@Multimode or Singlemode fiber

 

22. What fiber optic connector is specified by 568?

@SC type

 

23. What is another name for a “home run” cabling system?

@Zone cabling

 

Part 2: Copper Wiring

 

Chapter 5 – Telephone wiring

 

1. What is network interface (NI)?

@The network interface (NI) is the physical and electrical boundary between the inside wiring and the telecommunications network (small box mounted on an exterior wall with connectors and/or modular jacks inside

 

2. The point of location of the NI is always inside the residence.  T or False?

@False – The point of location for the NI will be determined by the telephone company

 

3. What type of plug does the telephone system use?

@Modular plug

 

4. What must you have if you have any circuits outside?

@All circuits that run out of doors (even if only partially) must be provided with circuit protectors (surge or voltage suppressors).

 

5. How far apart should power service drops be from communication service drops?

@12 inches

 

6. How much clearance must communication conductors have in a roof with a 4 ½ slope (4-inch rise and 12 inches horizontally)?

@3 feet

 

7. Surge arrestors must be put on all circuits with a block that may accidentally contact power circuits over ______volts.

@300 volts

 

8. What must ground conductors be made from?

@Must be copper or some other corrosion-resistant material, and they must have insulation suitable for the area in which they are installed

 

9. What wire guage for copper is the minimum used in telephone wires?

@#22 AWG minimum plus at least four insulated conductor wires

 

10. What colors are the four insulated wires normally used in telephone cables?

@Red, Green, Black, Yellow

 

11. What is the service of a bridge?

@To connect two or more sets of telephone wires

 

12. How far apart should you staple the wire in the vertical or horizontal direction?

@7.5 inches

 

13. What angle is suggested when changing driection?

@45 degree angle

 

14. What functions other than telephone use may a small office phone system have?

@Boxes for other functions like, voice mail, music on hold, alarm call, and so on

 

15. Where should you not place connections to telephone wiring?

@Outlet or junction boxes containing other electric wiring

 

16. Why could the telephone be a problem in the shower?

@Telephone ringing signals are a shock hazard

 

17. What should one be careful of when drilling into a wall, floor, or ceiling?

@Be careful to avoid contacts with concealed hazards, such as electric wiring, gas pipes, steam or hot water pipes, and so on.

 

18. What should one make sure of when working on mobile homes?

@Mobile homes should be properly grounded.  Line voltage present and extreme danger when working on metal

 

19. What can one do if minimum separations cannot be obtained?

@If minimum separations cannot be obtained, additional protection of  a plastic tube, wire guard, or two layers of vinyl tape extending 2 inches beyond each side of object being crossed must be provided

 

20. List four sources of problems one might encounter in telephone installations.

1.      broken wires  

2.      worn insulation 

3.      incorrect (e.g. red and green conductor reversed) loose connections 

4.      staples put through the wire

 

Chapter 6 – Video system installation

 

1. What do the acronyms CCTV and CATV stand for?

@CCTV =closed-circuit TV = for security surveillance

CATV =community antenna TV = (not cable TV) is used to distribute TV signals

 

2. What type of copper cable is used for the high-bandwidth CATV and CCTV signals?

@Coaxial cable

 

3. What needs to be done to install cables more than 2,000 feet?

@Requires the use of amplifiers to keep the signals at usable levels, or use of optical

fiber as the communication media

 

4. What cables and connector does CATV use?

@“F” connector, is standard;   large RG-8 or RG-59 or RG-6

 

5. How does one prevent signal interference with other electrical devices?

@It is important to use good cable with proper shielding and terminate properly to prevent signals interference with other electronic devices

 

6. What can alter a cable’s transmission?

@If staple or strap is cinched too tightly

 

7. What type of mounting cannot be used with built-in motion detector devices?

@Vandal-resistant cases

 

8. Why was CATV created?

@Started decades ago as a means of providing television-signals to communities that could not receive broadcast stations

 

9. What made CATV grow to the point of providing the service to over half the homes in the United States?

@Satellite

 

10. NEC article 820 refers to what type of cable?

@Coaxial cable

 

11. Why is grounding important to outdoor cables?

@Because they will be exposed to lightning strikes & direct strike

 

12. What guage conductor is used for outdoor grounding?

@> #14 copper & ampacity >= coaxial sheath

 

13. To protect outdoor runs or coaxial cable, what type of surge suppressors are commonly used?

@MOV (metal oxyde varistor) called “Protectors”

 

14. The coaxial communications circuits follow the same Code requirements as which of the following:

@(B) Communication circuits

 

15. Matching: Match each cable type with its use.

A.    CATVR            (1)Any location except risers and plenums

2. CATVX            (2)Spaces that have environmental air, plenums, or ducts
3. CATVP            (3)Very fire-resistant; runs in installation shafts or floors in buildings
4. CATV                        (4)Limited to only dwellings and raceways

 

A=(3);   B=(4);   C=(2);   D=(1)