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Cisco – Semester 1 – Chapter 4

Cisco – Semester 1 – Chapter 4. Making and Testing Dos and Don’ts. Behavioral Objectives. Document all work Do it as work proceeds Same as chapter 8 guidelines Don’t forget journals Develop Planning Mentality Create flow chart to guide work

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Cisco – Semester 1 – Chapter 4

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  1. Cisco – Semester 1 – Chapter 4 Making and Testing Dos and Don’ts

  2. Behavioral Objectives • Document all work • Do it as work proceeds • Same as chapter 8 guidelines • Don’t forget journals • Develop Planning Mentality • Create flow chart to guide work • Get permissions and materials before work begins • Respect Do’s and Don’ts for installing network media

  3. Learning Objectives • Use correct installation procedures for network media • Maximizes network performance • Follow established safety procedures when installing network media • Protect yourself and others • If you learn nothing else, learn this • Turn power off before you begin

  4. Networking Media • Foundation of OSI Model • Most Important Component of OSI model • RJ 45 Jack Recommended by TIA/EIA • Wiring Sequence is critical for optimum network performance

  5. Documentation • Use cut sheet • Rough diagram • Location of Cable runs, rooms, etc. • Record same data in journal • Label hardware termination units • UL969 states labels must adhere, be legible, and should discourage defacement. Labels should be mnemonic

  6. Flowchart Elements • Install outlets, jacks, NICS, hubs, switches, routers (document as you proceed) • Install Patch panels and test • Run and test cables (document as cables are run and tested) • Configure router(s) • Install and configure PCs • Document everything

  7. Know About and Use as Reference • OSHA Codes • Building Codes (State and Local) • Electrical Codes (TIA/EIA, UL) • Network Media Standards (IEEE, ISO/IEC)

  8. Wiring Closet Devices • Patch Panel (Layer 1) • Hubs - (can act as a switchboard interconnect); connects computers and other devices (Layer 1) • Bridge – Layer 2 – filters traffic • Switch – Layer 2 – filters and routes traffic • Routers – Layer 3 – segments network – reduces broadcast domain

  9. TIA/EIA Standards • Must use RJ-45 jack to connect CAT 5 UTP • May use flush or surface mount for jack • Surface mount may be screw mount or adhesive • Concerns: • At least 5 cm (2 inches) from bottom of baseboard (otherwise wall plate may interfere) • Avoid door and window trim

  10. Importance of Patch Panels • Key component of structured cabling • Allow cables to be terminated in organized yet strong and flexible manner • Cabling standards call for installation in certain areas of cable run – MDF and IDF

  11. Labeling Standards • UL 969 • Must meet standards including: • Legibility • Defacement • Adhesion

  12. Cabling Procedures • Label the Boxes and Cable before you start • Dress the Cable • Secure the Cable with Ties or Bars • Install Wire Management Panels

  13. Cabling Dos • Use cable ties to hold cables together • Strip back only sheathing that you need (maximum exposed is 1.3 centimeters or .5 inch • Keep bend radii to less than 4 times diameter of cable • Provide extra cable at ends (leave a service coil) • Use cable support bars, management panels, velcro straps, and ladder racks) • Label cable runs • Use Punch Down tool correctly (cut blade away from you)

  14. Cabling Don’ts • Don’t untwist wires – twisting is important for cancellation effect • Don’t stretch wire (causes untwisting) • Don’t bend cable – never beyond right angle • Don’t twist cable jacket (no kinks) • Don’t use a staple gun

  15. Rules for Cable Spools • Leave in box • Don’t unwind • Don’t cut cable unless labeled – at least three times at intervals • Do bind cable ends to pull as a unit

  16. Testing • Functional Test – plug in computer and see if you can make an outside connection to WWW • Use a cable tester (preferred method)

  17. Problems • Connectors are weakest Link • Attach CAT5 at Patch Panel in ascending order; labels should correspond to rooms • Keep ends centered above pin locations • Keep jacket within 6.4 mm of pin locations • Don’t untwist wire pairs more than necessary • Use Krone or 110 punch – depends on patch panel • Mount Patch Panel to wall, rack, or place in cabinet

  18. Other Problems • Split Pairs – wire from one circuit crossed with wire from another circuit(can’t be detected with wire map) find by visual inspection and cross talk measurement (is a result of wires not being part of same circuit – did not follow wire map) – result will be near end cross talk • Cross Talk – crossed pairs(can be detected visually and wire map) and with cable meter • EMF – unplug electrical devices (one at a time) and measure attenuation with cable tester

  19. Outside Problem Sources • Fluorescent lights • Heaters • Radios • Air cleaners, • TVs • Computers • Motors, Switches, Welders

  20. Tools • Signal Injector – put at end of cable to measure reduction in power of signal • Cable Tester aka Time Domain Reflectometer– (high number is good; low number problem) measures: • Signal attenuation • Near End Cross Talk • Distance • Bad connections • Crossed pairs • Can trace noise behind wall & measure noise

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