Cisco – Semester 1 – Chapter 9 Preview Review

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

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

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

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

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

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

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

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

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

Labeling Standards UL 969 –Must meet standards including: Legibility Defacement Adhesion

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

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)

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

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

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

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

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

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

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