Specifications | ADC_Final Dean Thompson |
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Specifications | ADC_Final Dean Thompson |
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Specifications | ADC_Final Dean Thompson |
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Content | Also, any time a patch cord and corresponding fibre are moved, damage can occur. And if the patch cord is damaged during the rerouting, a new patch cord will have to be installed. These situations increase the time required to turn up new services or to reconfigure or restore existing services. This also increases network operating costs and can adversely affect customer service. In interconnect systems, the slack storage system is generally not thoroughly considered, exposing large numbers of fibres to potential macrobending problems. Bend radius violations are common, and individual fibre access can be difficult. The introduction of field-terminated connectors would eliminate any storage issues, but it would also mean that any network reconfiguration would require a new patch cord to be run between the ODF and the FOT equipment. This would increase the congestion in the cable raceway between the frames, since the existing fibres would more than likely be left in place. The time required to reconfigure the network would also increase. If no network reconfiguration is anticipated, an interconnect architecture can work; however, as network requirements change, the ability to reconfigure the network effectively and efficiently becomes more important. The fact that the FOT patch cords don t have a dedicated termination location makes patch cord labeling and record keeping both more difficult and more critical. Interconnect generally works best in low fibre count (less than 144 fibres) systems in which the distance between the ODF and the FOT equipment is short. Interconnect can also be more cost-efficient in initial installation, requiring a minimum amount of equipment and floor space. But the more a network changes, the more desirable a cross-connect architecture becomes. Cross-Connect A cross-connect ODF architecture provides a dedicated termination point for both the OSP fibres and the FOT equipment fibres. The OSP and FOT fibres are connected via a cross-connect patch cord routed between the two ports on the front of the ODF. This makes accessing the network elements much easier and more cost-efficient, and improves the long-term reliability of the installed fibre network (see Figure 14). A cross-connect configuration provides the greatest flexibility when it comes to future network reconfigurations. If reconfiguration is required, all the work is done from the front of the frame with a patch cord that is generally less than ten metres in length. If by chance this cross-connect patch cord is damaged during handling, another patch cord can be easily used to replace it. This is not the case within an interconnect network, where the patch cord being rerouted is connected to FOT equipment that may be on the other side of the office. Additionally, having proper slack storage for the cross- connect patch cord will ensure that the network can be quickly reconfigured without inducing attenuation on adjacent fibres. An ODF system with a strong, flexible slack storage system will require only a few standard-length patch cords for use in cross-connect routings. Having fewer standard lengths of short patch cords required means that keeping such an emergency supply of cross-connect patch cords on hand is much easier and cheaper than keeping many different lengths in store. Using a cross-connect architecture also allows multi-fibre cables to be routed between the FOT and ODF. Using multi-fibre cable assemblies can reduce the total amount of time required to install the fibre network. They also provide additional protection to the fibres being routed. At the same time, there are 8/05 • 1317439 • Fibre Connectivity Solutions Technical Reference Interconnect and Cross-Connect Applications 18www.adckrone.com • +49-(0)30-8453-1818 Technical Reference (FOT) Equipment Slack Storage System OSP Cable Splice Fibre Termination PanelSplice Enclosure or Panel Cross-Connect Fibre Patch Cord Optical Distribution Frame Termination Panel FOT Fibre Patch Cord Figure 14. Cross-connect signal flow |
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