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OBJECTIVES

OBJECTIVES. 1. Describe various level ratings that apply to telecommunication cables and jacks and identify where each is implemented. 2. Describe the various levels of the cabling category rating systems. 3. Define terms associated with category performance.

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OBJECTIVES

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  1. OBJECTIVES 1. Describe various level ratings that apply to telecommunication cables and jacks and identify where each is implemented. 2. Describe the various levels of the cabling category rating systems. 3. Define terms associated with category performance. 4. State the proper type of wiring system for a given network application. 5. Given a certain network type, state the maximum transmission speed and distance the network can handle.

  2. Table 4-1: Rating Levels

  3. Table 4-2: Cabling Category Ratings

  4. Table 4-3: CAT5 Maximum Attenuation Ratings

  5. Table 4-4: Minimum NEXT Ratings

  6. Figure 4-1: Hierarchical Token Ring

  7. Token Ring transmission operates like this: A station can only transmit when it has the token. All transmitted frames are passed from station to station around the ring. All stations test each passing frame for messages addressed to them, process the information if it is theirs, and pass a marked token back around the ring. The original transmitting station releases the token when it returns around the loop.

  8. Table 4-5: Token Ring Specifications

  9. LAB 8 OBJECTIVE Installing UDC Connectors on 150-Ohm STP To understand how to install UDC connectors on 150-ohm STP cable

  10. TIP You should take special note of the various connector and cable types specified, as well as their configurations.

  11. Figure 4-2: Threading the UDC Strain Relief and Dust Cover a

  12. TIP Remember to trim the four wires to 5/8 of an inch, as indicated in the instruction sheet. While following the instructions, keep in mind that you are using Type-1A cable.

  13. Figure 4-3: Removing the UDC Lock

  14. TIP Notice that once the lock is removed, the UDC release tabs on either side of the adapter are free to flex.

  15. Figure 4-4: Connecting the UDC and Adapter Together

  16. Figure 4-5: Reinstalling the UDC Lock

  17. Figure 4-6: Testing the Cable Assembly

  18. TIP If everything is working properly, the cable tester should indicate that lines 1 through 6 are connected, while lines 7 and 8 are not. If your tester indicates a short between lines 3 and 6, this is normal because both lines are grounded.

  19. TIP If you hold a tube down with your thumb, you can use a slotted-head screwdriver to pry its wire up and out without inflicting any damage on the tube itself.

  20. Figure 4-7: Removing the Wires

  21. LAB 8 QUESTIONS How many signal wires are supplied with 150-ohm, Type-1A STP cable? 1

  22. LAB 8 QUESTIONS Which pins are grounded in a UDC/RJ45 adapter? 2

  23. LAB 8 QUESTIONS Is it possible to disconnect the UDC/RJ45 adapter from a UDP connector without first removing the UDC lock? 3

  24. Figure 4-8: Transmission Pairs of a 100baseT4, 8-pin Modular Plug

  25. The advantages of using 100baseT4 include: It operates on virtually any preexisting twisted pair cabling. Its adapters are about 10% less expensive than those for other systems. Less expensive CAT3 cabling can be used.

  26. The disadvantages of using 100baseT4 include: It cannot support Full Duplex mode (unneeded in workstations). It requires four pairs of wiring to operate.

  27. The advantages of using 100baseTX include: It uses only two pairs of twisted pair wiring. It supports Full Duplex mode for up to 200 Mbps in network servers.

  28. The disadvantages of using 100baseTX include: All of the patch panels and jumper blocks must be CAT5-compatible. Adjacent cable pairs cannot be used for other applications. Distance limitation per link is 100 meters, or 200 meters with a single repeater. Full duplex mode requires Full Duplex switching apparatus.

  29. Several key considerations for choosing a Gigabit Ethernet high-speed network include: Straightforward migration to higher performance levels without disruption Low cost of ownership—including both purchase and support Capability to support new applications and data types Network design flexibility

  30. Digital communications techniques include: Using existing 4-pair, CAT5 cable that conforms to TIA/EIA T568A Using all four pairs in the cable to keep symbol rate at, or below, 125 Mbaud Using PAM5 coding to increase the amount of information sent per symbol Using 4D 8-state Trellis Forward Error Correction to limit noise and crosstalk Using pulse shaping to condition the transmitted spectrum Using DSP equalization for noise, echo, crosstalk, and BER compliance

  31. Some ATM Technology key applications include: Video conferencing Desktop conferencing Multimedia communications ATM over satellite communications Mobile computing over ATM for wireless networks

  32. Figure 4-9: BNC T Connector

  33. LAB 9 OBJECTIVE Placing a BNC Connector on a Coaxial Cable To understand how to place a BNC connector on a coaxial cable

  34. Figure 4-10: Coaxial Components

  35. TIP You will first use the 6-inch piece of RG58 cable, or a piece from the scrap heap, for practice purposes before working on the 5-meter section.

  36. Figure 4-11: Setting the Cable Stripper for RG58

  37. TIP The V-block insert will slide out if you push it from the back side, using the Allen wrench stored in the bottom of the stripper, so that you can rotate it to the correct setting before reinserting.

  38. Table 4-6: V-Block Settings

  39. TIP Again, use the Allen wrench to push the large center pin out just as you did with the V-block insert. Cup the top in your hand as the pin is removed to prevent it from jumping off the assembly. Set the center pin safely aside.

  40. Figure 4-12: Interior Parts and Locations of Stripper

  41. TIP The blades may need to be adjusted somewhat for stripping RG58 cable. The blade positions A and B are intended to adjust the position of the blade that strips to the inner conductor of the cable. Blade positions C, D, and E are intended to adjust the position of the blade that strips to the braid (or alternately, to the center insulation through the braid).

  42. Table 4-7: Cable Stripper Settings

  43. Figure 4-13: Removing Small Center Pin

  44. Figure 4-14: Positioning the Cutting Blades

  45. TIP The dimensions refer to the distance between a stripped center conductor and an intact cable jacket. Take care to keep the spring oriented properly once the blades have been positioned.

  46. TIP This all sounds easy enough, but the blades need to be aligned perfectly before the small center pin will reinsert correctly. If you need help, see your instructor.

  47. Figure 4-15: Positioning the Stripper

  48. Figure 4-16: Adjusting the Depth of the Blades

  49. TIP Keep in mind that the blade on the left strips to the center conductor, while the blade on the right strips to the braid, or alternately, through the braid to the center insulation. In this case, you’ll want to strip through the braid to the center insulator. When trying to perfect the depth of cuts provided by the stripper, you should use the 6-inch piece you cut from the spool (or a piece of RG58 from the scrap heap), and practice adjusting the blade heights so that neither the center conductor nor the insulation is damaged by the cut. Obviously, a two-bladed stripper will require you to perform additional work to trim the braid properly.

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