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EQUIPMENT CABLING CHAPTER 9: EQUIPMENT INSTALLATION 9.9.8 RF CABLING COLORED ARMOR LABEL FIGURE 9-16 FIBER OPTIC CABLE IDENTIFICATION RF cabling typically consists of 6.35 mm (0.25 in.) or 12.5 mm (0.5 in.) coaxial cables of foam filled or superflexible construction. RF cabling shall not be run nearer than 50.8 mm (2 in.) to conductors of other wiring systems (NFPA 70-2005, Articles 810.18, 810.70, and 820.133). Bend radius considerations shall be observed as specified below, or as otherwise specified by the cable manufacturer. Minimum bend radius for superflexible cable sizes: • 6.35 mm (0.25 in.) diameter cable: 25.5 mm(1 in.) bend radius • 12.5 mm (0.5 in.) diameter cable: 31.7 mm (1.25 in.) bend radius Minimum bend radius for foam-filled cable sizes: • 12.5 mm (0.5 in.) diameter cable: 127 mm (5 in.) bend radius • 22.2 mm (0.875 in.) diameter cable: 254 mm (10 in.) bend radius • 31.7 mm (1.25 in.) diameter cable: 381 mm (15 in.) bend radius • 41.3 mm (1.625 in.) diameter cable: 508 mm (20 in.) bend radius 9.9.9 CABLING IN TELEPHONE WIRING ENVIRONMENTS NOTE: The following considerations apply only in cases where customer work must meet specifications stipulated by a telephone utility. If no special stipulations are stated by the telephone company, best commercial practices such as Telcordia specifications may be used for telephone company cabling within the communication site. When installing cabling that connects with telephone company assets or a demarcation point, inquire about any lacing requirements before work is performed. 9.9.9.1 ELECTRICAL INTERFACE REQUIREMENTS Connection to telephone company assets may require the use of surge suppression for customer signal circuits that interface to telephone company circuits. Inquire through the telephone company regarding these requirements before connecting to telephone company circuits. 9-28 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES EQUIPMENT CABLING 9.9.9.2 CABLING LACING REQUIREMENTS When installing a system for telephone company or possibly other utility companies, special cabling methods may be required. Observe the following considerations for the installation of telephone company cabling: • Lacing, rather than nylon cable ties, shall be used as the preferred means of cable attachment to cable tray, to eliminate the possibility of sharp edges found on cut cable ties. • The lacing method specified by the telephone company shall be used. Typical lacing is shown in Figure 9-17. FIGURE 9-17 TELEPHONE COMPANY LACING METHODS • Lacing is typically 4- or 9-ply waxed polyester twine. • Lacing of horizontal cables in cable trays should be performed every 914 mm (3 ft.). • Lacing of vertical cables to a cable ladder should be performed at every rung of the cable ladder. Any cable hanging between horizontal/vertical runways and racks cannot be unsupported for more than 610 mm (24 in.). 9.9.10 DISTRIBUTION FRAME CONFIGURATIONS A distribution frame (Figure 9-18 on page 9-30) provides a centralized cross-connection point for audio, data, and alarm and control wiring between different pieces of equipment at a site and between the site and external lines. Distribution frames shall be implemented using one of the following methods: • Distribution punch blocks affixed to a plywood panel that is mounted on a wall or a rack. • Distribution punch blocks mounted on open-rack frames available from various manufacturers. These frames can be anchored to the floor; they save wall space at the cost of floor space. • Typically, a distributed (as opposed to centralized) method is used. Pre-wired cross-connect panels (each 1 rack unit in height) distribute connections on a rack-by-rack basis. Typically, remote sites require one panel and the prime site is equipped with one to three panels, depending on the application. 68P81089E50-B 9/1/05 9-29
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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 349 and 350: STANDARDS AND GUIDELINES FOR COMMUN
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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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