Chapter 9 – Wiring Termination Practices

 

 

  1. For Coax CATV cable, what is the most important part of installation? (pg. 121)

@installing connectors

 

  1. Name all the parts of the coaxial cable construction. (pg. 122)
    1. Jacket
    2. Shield
    3.  Dielectric
    4. Conductor

 

  1. What tools do you use to terminate coaxial cable?

@ you will need a coax cable stripper and the crimp tool (crimpers) with the proper coax connector jaws installed. (pg. 122)

 

  1. Since the coaxial cable is well-protected and durable, one can pull as hard as on wishes to install the cable. T or F?

@ False.  Coax cables must be installed with care; they may not be pulled beyond their tension limits, and may they not be sharply bent. (pg. 124)

 

  1. What will poor termination of coax cable cause?

@Poor termination of coax cable will cause signal interference with other electronic devices.  They can also cause reflections in the cable that affect the return path, or connection back to the system. (pg. 125)

 

  1. Can Cat 5 cable used in place of Cat 3? Yes or No

@Yes.  Since the cost of Cat 5 is little more than that of Cat 3, and using only Cat 5 cables facilitates future upgrades and simplifies managing cable plants. (pg. 125)

 

  1. Can Cat 3 cable be used in place of Cat 5? Yes or No

@No (pg. 125)

 

  1. What is the major installation problem with Cat 5 cable?

@The major installation problem with Cat 5 cable is poor workmanship that is responsible for as many as 80 percent of Cat 5 installation which will not meet Cat 5 performance specification. (pg. 126)

 

  1. What are the four colors of the wires in Cat 5 cable?

@Orange, Green, Blue, Brown

 

  1. What is the maximum pulling tension of Cat 5 cable?

@C. 25 pounds.  The specification for pulling tension is only 25 pounds. (pg. 126)

 

  1. What is the longest horizontal distance Cat 5 cable should be from the patch panel to the work area outlet? (meters and feet)

@ 90 meters or 295 feet. (pg. 128)

 

 

 

 

 

  1. What tools do you use top punch down the wires into a 110 block?

@You would use a Punchdown tool with 110 blade to punch down the wires into a 110 block. (pg. 130)

 

 

  1. How far should you untwist the pairs in Cat 5 cable to terminate the ends?

@You should untwist just enough wire to place each wire in the punchdown slot, less than ˝ inch after terminations. (pg. 132)

 

  1. In a 110 block, what makes the contacts between the two wires in the block?

@In a 110 block, the contacts are in the connecting block. (pg. 134)

 

  1. What two ways can you use to mate cable in a 110 block?

@Two ways we can use to mate cables in a 110 block are: (pg. 135)

    1. We can punchdown the cable to the top of the connecting block.
    2. We can terminate the cable in a patch plug.

 

  1. What style of punchdown block is commonly used with Cat 3 cable for telephones?

@“Type 66” block is commonly used with Cat 3 cable for telephones. (pg. 140)

 

  1. A wire mapper is not  used to test Cat 5 compliance up to 100 MHz.  T or F

@False.  The wire mapper tests all the wire mapping faults found in Cat 3 or Cat 5 cabling, including opens and shorts, reversed pairs, crossed pairs, and split pairs. (pg. 143)

 

  1. Where do most shorts and opens occur?

@Most shorts and opens will occur at the connections. (pg. 145)

 

 

Chapter 10 – Fiber Optic Cabling Systems

 

1.      When is it necessary to use fiber optics in communications systems?

@Fiber is necessary where longer distances or electromagnetic interference (EMI) is a problem.  It is also preferred by network users who are planning on upgrades to higher bandwidth in the future. (pg.l52)

 

2.      What connector do most users install in fiber optics?

@Most users install SC connector in fiber optics. (pg. 48)

 

3.      What connector is the EIA/TIA standard?

@SC-type is the EIA/TIA standard. (pg. 48; #22)

 

4.      What is another name for “zone cabling”?

@Another name for “zone cabling” is “home-run”. (pg. 48; #23)

 

5.      What can make fiber optics competitive to copper?

@What makes fiber optic compatible to copper is that plastic fiber may soon offer more performance than Cat 5 at equal or lesser prices. (pg. 152)

 

6.      What is the only mandatory standard for fiber optic installations?

@The only universal, mandatory standard for fiber optic plant installation is Chapter 770 of the National Electrical Code (NEC). (pg.l53)

 

7.      Who charted the Fiber Optic Association (FOA) and the National Electrical Contractors Association to develop standards?

@ANSI has chartered the Fiber Optic Association (FOA) and the National Electrical Contractors Association to develop installation standards for fiber optics, covering workmanship standards for installations. (pg.l53)

 

8.      Are standards the same as regulations or codes?

@NO.  Standards are guidelines -  not regulations. (pg.l53)

 

9.      Which test equipment costs less: copper or fiber?

@Fiber.  Fiber optic test equipment cost less than copper test equipment. (pg.l53)

 

10.  For safety in fiber optics, which part of the body should be of most concern? Why?

@The eye, because if the small scraps of bare fiber cleaved off the ends of fibers, which are extremely sharp, get into your eyes, they are very hard to flush out. (pg.l53)

 

11.  What determines how well the fiber optic system works?

@How well the reconverted electrical signal out of the receiver matches the input to the transmitter determines how well the fiber optic system works. (pg.l55)

 

12.  Why are two fibers used for duplex transmission?

@Each duplex link consists of two separate links operating on two fibers transmitting in opposite directions. (pg.l54)

 

 

 

13.  What two factors does the receiver power depend on?

@The receiver power depends on two factors: (pg.l55)

1.      How much power is launched into the fiber by the transmitter.

2.      How much is lost by attenuation in the optical fiber cable that connects the transmitter and receiver.

 

14.  Which of the following applications use analog links and which use digital links?

AM CATV         Analog

      CCTV         Analog

      SONET         Digital       

      Ethernet         Digital

      FDDI         Digital

      ESCON         Digital (pg.l55)

 

15.  What is the difference between transmitter power output and receiver sensitivity called?

@The difference between transmitter output and receiver sensitivity is called the loss margin of the link. (pg.l55).

16.  What happens to the receiver at high power levels?

@At high power levels, the receiver amplifier saturates and distorts the signal. (pg.l55)

 

17.    What determines the sensitivity of the receiver?

@The minimum power level that produces an acceptable bit error rate determines the sensitivity of the receiver. (pg. 155)

 

18.    What happens to the receiver sensitivity at higher bit rates?

@The receiver sensitivity will degrade at higher bit rates. (pg. 155)

 

19.    What sources and wavelengths are used for longer distances in telecom?

@Fiber amplifiers and 1,550 nm is used for longer distances in telecom. (pg. 156)

 

20.    What new device is used for 850-nm Gigabit Ethernet?

@A new type of inexpensive laser, a VCSEL, (vertical cavity surface emitting laser) will be used for 850nm Gigabit Ethernet. (pg. 156)