Programming Documents for Pre-K for SA - The City of San Antonio
Programming Documents for Pre-K for SA - The City of San Antonio
Programming Documents for Pre-K for SA - The City of San Antonio
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11. Cable Terminations<br />
11.1 General<br />
Cable termination involves the organizing <strong>of</strong> cables by destination, <strong>for</strong>ming and dressing cables,<br />
labeling, and creating a connection with a copper or fiber conductor.<br />
11.2 <strong>Pre</strong>-Termination Functions<br />
Cable termination preparation not only improves the quality <strong>of</strong> the job but also decreases the amount <strong>of</strong><br />
time required <strong>for</strong> termination.<br />
<strong>The</strong> per<strong>for</strong>mance <strong>of</strong> pre-termination functions involves organizing the cable by destination. Cable to be<br />
terminated should be placed at the point <strong>of</strong> termination and shall be identified to ensure it is terminated<br />
in the designated position. Cable connection is not complete until all terminations are identified and<br />
labeled.<br />
Alien crosstalk is associated with copper balanced twisted-pair cabling and an issue <strong>of</strong> which the<br />
installer must be aware. This issue can be mitigated by allowing cables to have a more natural lay<br />
rather than <strong>for</strong>ming tight bundles and allowing cables to be run next-and-parallel to each other. While<br />
<strong>for</strong>ming and dressing the cable at the point <strong>of</strong> termination may be visually pleasing, doing so <strong>for</strong> longer<br />
distances, such as within a cable tray, may lead to alien crosstalk per<strong>for</strong>mance issues. Separation <strong>of</strong><br />
balanced UTP cables should follow the guidance <strong>of</strong> ANSI/TIA 568-B.1-10 and TIA/TSB 155.<br />
11.3 Copper IDC Termination<br />
11.3.1 General<br />
Copper terminations are used <strong>for</strong> balanced twisted pair cabling and the use <strong>of</strong> insulation<br />
displacement contact (IDC) is recommended. When terminating balanced twisted-pair copper<br />
cable:<br />
• Remove only as much cable jacket as is required <strong>for</strong> termination and trimming.<br />
• Follow the manufacturer’s instructions <strong>for</strong> mounting, termination, and cable management.<br />
• Minimize the amount <strong>of</strong> untwisting in a pair as a result <strong>of</strong> termination to connecting hardware.<br />
For untwisting cabling, maintain pair twists as close as possible to the termination point. <strong>The</strong><br />
amount <strong>of</strong> untwisting will not exceed:<br />
• 1 inch <strong>for</strong> category 3 cables.<br />
• 0.5 inch <strong>for</strong> category 5e and higher cables.<br />
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