standards and guidelines for communication sites - Radio And ...
standards and guidelines for communication sites - Radio And ... standards and guidelines for communication sites - Radio And ...
EQUIPMENT CABLING CHAPTER 9: EQUIPMENT INSTALLATION • Cables should be dressed up into the cable runway or down into the under-floor raceway as dictated by the site design. FIGURE 9-18 TYPICAL DISTRIBUTION FRAME 9.9.11 DISTRIBUTION FRAME CROSS-CONNECT WIRING • Cross-connect wires shall be AWG #22 - #24 (0.644 mm - 0.511 mm) plastic-insulated solid copper wire. Stranded wire shall not be used. • Individual wires shall enter the punch terminal from the top so that the wire tail points down after punch-down. (CAT3, 4, 5, or 6 data wiring shall enter punch terminals from the middle such that one wire points up while the other points down. In this manner, the cable twist that maintains the cable impedance stays intact.) • The wiring shall dress down the source block column, across the bottom of the frame, and up the destination block column. Approximately 50.8 mm (2 in.) of service loop at each end of the punched down wire shall be allowed. • Wiring shall be properly secured using industry-standard methods. 9.9.12 CABLE LABELING Cabling shall be identified with a standardized, double-ended system to facilitate cable and equipment connection identification. (See ANSI/TIA/EIA-606 for additional information.) Observe the following when devising a cable labeling system: • Labeling shall identify the direction along the cable where terminating equipment is located. • Labeling shall indicate the destination ends of the cable, including equipment name and connector reference designator or name. This applies to connectorized, lugged, or punched down cable terminations regardless of the application (RF, audio, or control). 9-30 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES ELECTROSTATIC DISCHARGE CONSIDERATIONS • Labeling shall be imprinted on white opaque material (preferably plastic or plasticized paper) using indelible black ink. • Label placement shall be between 101 to 152 mm (4 to 6 in.) from each end of the cable (or the most logical point that would allow the label to be easily read). • Labeling should wrap entirely around the cable. It should be secure enough to assure label retention if cable is to be pulled through conduit. • Information printed on each label should be brief but clearly understandable. Use industry-standard abbreviations and acronyms to conserve label space. FIGURE 9-19 EXAMPLE OF CABLE LABELING 9.10 ELECTROSTATIC DISCHARGE CONSIDERATIONS Installation and repair of certain equipment will require removal and replacement of Field Replaceable Units (FRUs) within the equipment for purposes of setting configurations or installing FRUs specific to site applications. Whenever equipment must be opened, electrostatic discharge (ESD) precautions shall be adhered to. In general, the following requirements shall be met: • An ESD-protected work area shall be present. • An ESD wriststrap shall be worn when handling ESD-sensitive modules. • ESD-protected packaging shall be available for containing modules removed from equipment. All precautions specifically stated for the equipment being worked on shall be adhered to in accordance with the respective documentation for the equipment. It is recommended that replacement FRUs be stored in their anti-static packaging, in an anti-static cabinet or enclosure to ensure that they are protected from ESD until they are needed for equipment repair. See Appendix B for general ESD information. 68P81089E50-B 9/1/05 9-31
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EQUIPMENT CABLING CHAPTER 9: EQUIPMENT INSTALLATION<br />
• Cables should be dressed up into the cable runway or down into the under-floor raceway as dictated<br />
by the site design.<br />
FIGURE 9-18 TYPICAL DISTRIBUTION FRAME<br />
9.9.11 DISTRIBUTION FRAME CROSS-CONNECT WIRING<br />
• Cross-connect wires shall be AWG #22 - #24 (0.644 mm - 0.511 mm) plastic-insulated solid<br />
copper wire. Str<strong>and</strong>ed wire shall not be used.<br />
• Individual wires shall enter the punch terminal from the top so that the wire tail points down after<br />
punch-down. (CAT3, 4, 5, or 6 data wiring shall enter punch terminals from the middle such that<br />
one wire points up while the other points down. In this manner, the cable twist that maintains the<br />
cable impedance stays intact.)<br />
• The wiring shall dress down the source block column, across the bottom of the frame, <strong>and</strong> up the<br />
destination block column. Approximately 50.8 mm (2 in.) of service loop at each end of the<br />
punched down wire shall be allowed.<br />
• Wiring shall be properly secured using industry-st<strong>and</strong>ard methods.<br />
9.9.12 CABLE LABELING<br />
Cabling shall be identified with a st<strong>and</strong>ardized, double-ended system to facilitate cable <strong>and</strong> equipment<br />
connection identification. (See ANSI/TIA/EIA-606 <strong>for</strong> additional in<strong>for</strong>mation.) Observe the following<br />
when devising a cable labeling system:<br />
• Labeling shall identify the direction along the cable where terminating equipment is located.<br />
• Labeling shall indicate the destination ends of the cable, including equipment name <strong>and</strong> connector<br />
reference designator or name. This applies to connectorized, lugged, or punched down cable<br />
terminations regardless of the application (RF, audio, or control).<br />
9-30 68P81089E50-B 9/1/05
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