TAILIEUCHUNG - CCNA 1 and 2 Companion Guide, Revised (Cisco Networking Academy Program) part 98

Cisco Networking Academy Program CCNA 1 and 2 Companion Guide, Revised part 98 is the Cisco approved textbook to use alongside version of the Cisco Networking Academy Program CCNA 1 and CCNA 2 web-based courses. The topics covered provide you with the necessary knowledge to begin your preparation for the CCNA certification exam (640-801, or 640-821 and 640-811) and to enter the field of network administration. | B Page 939 Tuesday May 20 2003 4 54 PM Installation Process 939 Lab Activity Terminating Category 5e to a 110-Block In this lab you learn how to terminate Category 5e cable to a 110-type termination block as well as how to properly use a 110 punchdown tool and a 110 multipunch tool. The Trimout Phase In the rough-in phase of cable installation excess cable was left at both ends of the cable run. These coils of cable which are used to take up slack and facilitate later changes are known as service loops. Service loops are discouraged by EIA TIA standards. It is not uncommon to have 1m 3 ft. of ends hanging out of a wall jack at the finish of the rough-in stage. In the telecommunications room TR where hundreds of cables are terminated it is not uncommon to have 2m to 3m 6 ft. to 10 ft. of ends. Although this practice appears to be wasteful experienced installers know that an excess of cable provides more flexibility in cable routing and provides greater access to cables when toning testing individual cables. A common mistake of new installers is to cut the cable short. Remember excess can always be cut off but a short cable cannot be extended. If a cable is too short the only alternative is to pull another cable and this is a costly alternative in terms of labor and time. If there is 1m 3 ft. of cable coming out of the wall at the jack location it is best to cut this back to about 25 cm in. . A new label should be applied to the cable about 15 cm in. from the end. The jacket then should be stripped back about 5 cm to 7 cm 2 in. to in. exposing the individual twisted pairs. The completed jack termination should have no more that cm .6 in. of unjacketed conductor exposed and no more than cm .6 in. of untwist in the cable pairs. Excess conductor length should be cut off at the final termination see Figure A-40 . Figure A-40 Cutting Cable to Length Page 940 Tuesday May 20 2003 4 54 PM 940 Appendix A Structured Cabling The jack is

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