CCNA1_CaseStudy_Structured_Cabling (1130680), страница 2

Просмтор этого файла доступен только зарегистрированным пользователям. Но у нас супер быстрая регистрация: достаточно только электронной почты!

Текст из файла (страница 2)

Testingis for functionality and determines if the wirecan carry the signal from end to end.• Certification, or performance testing, is astatement about cable performance.Certification answers the following questions:– How well does the signal travel down the cable?– Is the signal free from interference?– Is the signal strong enough at the other end of the cable?Certification Tests•••••••••••Specified Frequency RangeAttenuationEnd Crosstalk (NEXT)Power Sum NEXTAttenuation-to-Crosstalk Ratio (ACR)Power Sum ACREqual-Level Far End Crosstalk (ELFEXT)Power-sum ELFEXTReturn LossPropagation DelayDelay SkewLink and channel testing• The channel test goes end-to-end from the workstationor telephone to the device in the TR.• The link test only tests the cable from the wall back tothe patch panel in the TR.Cutting over• Cutting over is the term used for the transfer ofexisting services to a new cable system.

It is alsoused for the installation of new equipment on anewly installed cable system.Cutover guidelines• Successful cutovers require carefulplanning, organization, and attention todetail. When cutting over, use thefollowing guidelines to ensure success:––––Keep detailed records of the installation.Test every cable that is installed.Develop accurate cut sheets.Schedule the cutover when it is most convenient for thecustomer.The Cabling BusinessThe Cabling Business• Cable installer becomes a representative ofa company. Therefore, a professionalappearance and demeanor should alwaysbe maintained.• When working on a job, use the followingguidelines:–––––Respect the job site.Wear clean and neat work clothes to the job site.Arrive at an agreed upon time.

Punctuality is important.Determine the acceptable noise level.Treat customers, building occupants, coworkers, and bosseswith respect.Site Survey• The site survey, or project walk through, is one ofthe most important steps before preparing a costestimate for a project.• It allows the contractor to identify any issues thatmay affect the installation.Site Survey••••••••Are there plenum-ceiling areas?Is there a staging and storage area for materials?Are special work hours required?Are there special safety requirements? This isparticularly relevant in factory environments.Which walls are firewalls?Is there asbestos in the building?Will the customer supply spare ceiling tiles in theevent of breakage?Are there special labor issues to be considered?Contract Revision and Signing• After all of the negotiations are complete, thecontract must be revised to reflect any agreed-uponchanges.• The customer and the contractor must then reviewthe contract in detail.• The contract must be signed to become a validagreement.Project Planning• Select the project manager or supervisor.• Select crews based on the project size, skillsrequired, and time allowed for completion.• Identify and schedule subcontractors.• Create a material delivery schedule.• Make provisions for waste disposal.• Choose suppliers• Ordering materialsFinal Documentation• It is important to provide as-built drawings to thecustomer.• Floor plans, furniture plans, or T drawings are usuallyused as the basis for as-built drawings.• The punch list is the checklist that the customerprovides the contractor with when the contractorconsiders the project complete, including:– Uncompleted items, such as missing outlets or cable runs– Unsatisfactory items, such as cables that are not fastened to ladder racks oroutlets that do not work– Clean up items, such as debris left in the corridorSummary•••••••Structured Cabling SystemsStructured Cabling Standards and CodesSafetyTools of the TradeInstallation ProcessFinish PhaseThe Cabling Business.

Характеристики

Список файлов учебной работы