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EQUIPMENT CABLING CHAPTER 9: EQUIPMENT INSTALLATION Computer FIGURE 9-11 DISALLOWED “BRIDGE TAP” CONNECTION • Never untwist the twisted pairs of a CAT 5 cable beyond 12.7 mm (0.5 in.) from the point of termination. Untwisting the wires can decrease the cable’s category performance rating and degrade system performance. See ANSI/TIA/EIA-568-B and CSA-T529 for additional information. • Do not make sharp bends in CAT 5 cable. The bend radius for CAT 5 cable shall not be less than ten times the outside diameter of the cable. Bending the cable with a shorter bend radius can affect the electrical characteristics of the cable and degrade system performance. See ANSI/TIA/EIA-568-B and CSA-T529 for additional information. • Do not pull a CAT 5 cable using a force greater than 110 Newtons (25 lb-force), or as suggested by the cable manufacturer. Pulling a cable with too much force can change the cable’s electrical characteristics and degrade its performance. See ANSI/TIA/EIA-568-B and CSA-T529 for additional information. • Do not over-tighten CAT 5 cable with cable ties or other supports. Over-tightening cable ties or other supports can change the electrical characteristics of the cable and degrade the system performance. Velcro-style cable ties are recommended. See ANSI/TIA/EIA-568-B and CSA-T529 for additional information. 9.9.6.6 TOPOLOGY Computer Computer Punch Block Hub/Switch Computer network cabling shall utilize a “Star” topology, unless the specific design of the network calls for a different topology. Figure 9-12 shows a star topology example. See ANSI/TIA/EIA-568-B and CSA-T529 for additional information. 9-22 68P81089E50-B 9/1/05 Server
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES EQUIPMENT CABLING FIGURE 9-12 STAR TOPOLOGY • CAT 5 segment lengths shall not exceed 100 m (328 ft.). This includes 90 m (295 ft.) of building cabling and up to 10 m (32.8 ft.) of equipment cords, cross-connects and patch cords. Of the 10 m (32.8 ft.) allowed for equipment cords, cross-connects and patch cords, a maximum of 3 m (9.8 ft.) should be used from the computer workstation to the information outlet. See ANSI/TIA/EIA-568-B and CSA-T529 for more details. Figure 9-13 shows the maximum cabling lengths between various network elements. Computer Computer Computer 3 m (10 ft.) 3 m (10 ft.) Information Outlet Information Outlet 100 m (328 ft.) Hub/Switch FIGURE 9-13 NETWORK SEGMENT LENGTHS LIMITATIONS • For simplifying installation and reducing cable runs, a single CAT 5 cable may be run from the equipment room hub/switch to an additional hub/switch in the computer workstation area for distribution to the individual computers. This can reduce the number of cables required between the equipment room and the individual computers. Figure 9-14 shows an example of a single cable run. See ANSI/TIA/EIA- 569-B for additional information. 68P81089E50-B 9/1/05 9-23 Server Computer 90 m (295.4 ft.) 90 m (295.4 ft.) Cross-Connect 7 m (23 ft.) Computer
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© 2005 MOTOROLA, INC. ALL RIGHTS R
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TABLE OF CONTENTS Chapter 1. Introd
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STANDARDS AND GUIDELINES FOR COMMUN
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CHAPTER 1 INTRODUCTION 1 This manua
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CHAPTER 2 SITE DESIGN AND DEVELOPME
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CHAPTER 3 COMMUNICATION SITE BUILDI
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CHAPTER 4 EXTERNAL GROUNDING (EARTH
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CHAPTER 5 INTERNAL GROUNDING (EARTH
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CHAPTER 6 POWER SOURCES 6 6.1 LOCKO
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CHAPTER 7 SURGE PROTECTIVE DEVICES
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Page 343 and 344: STANDARDS AND GUIDELINES FOR COMMUN
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Page 405 and 406: APPENDIX A ELECTROMAGNETIC ENERGY I
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APPENDIX C PROTECTING AGAINST ELECT
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APPENDIX D GROUNDING (EARTHING) ELE
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APPENDIX E GENERAL CONVERSIONS AND
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APPENDIX F R56 COMPLIANCE CHECKLIST
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I NDEX Index Index AC power cabling
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