Electrical Contracting News (ECN) December 2016 - Page 31

DATA CABLING This type of cabling is usually installed in ceiling voids and the building core – places where there are usually no people around. Designers and specifiers need to be aware there might be considerations related to physical robustness of product closures and flammability rating. The precise moment of installation is also particularly important. The type of wiring is part of the building’s core infrastructure. One of the challenges related to installing a wireless ready structured cabling solution is the fact that you need to plan well ahead. Many of the places described above are unreachable after completion of the structural work on the building. Upgrading later would be difficult, expensive – and maybe not even possible Category 6A is the recommended minimum for connecting high bandwidth Wi-Fi access points. 802.11n Current 802.11ac Wave 1 802.11ac Wave 2 802.11ac Wave 3 2.4 GHz / 5 GHz 5GHz 5GHz 5GHz Bit rate 450Mb/s 1.3 Gb/s 2.5 Gb/s 6.9 Gb/s Maximum throughput 290 Mb/s 850 Mb/s 1.7 Gb/s 4.5 Gb/s Band In many current networks, speeds of 1Gbps are required, for which a Category 5e/Class D cable is quite sufficient. This has also fits in nicely with the view that the connected ‘non-user’ devices transfer relatively low quantities of data and therefore a 10/100 MB Ethernet service is more than adequate. However, new devices based on the latest Wireless Application Protocol theoretically offer 1.3Gbps or even higher wireless connectivity, which means that the 1Gb Ethernet backbone could already be a bottleneck. Consequently, Category 6A is also the new ‘de facto’ minimum requirement office cabling. Future proof wiring also means designingin adequate reserve capacity. The alien crosstalk performance and extended reach margin of Category 6A make it the best solution for wireless deployment. Unlike Category 6 and Category 5e, whose alien crosstalk performance has not been specified, Category 6A offers ample margins to assure 100m system operation and data integrity regardless of network speed or proximity of adjacent channels. Built-in shielding technology allows for outstanding signal isolation. Bandwidth boost As the bandwidth of Wi-Fi increases and the number of users grows, more bandwidth is required from structured cabling. Generally speaking, the best wireless infrastructure has a very well specified wired backbone, often scaled to suit wireless connection speeds. For some years, the vast uptake of portable computing devices such as tablets and smartphones has been leading to a fast growing demand for wireless connectivity. Today, we see more and more devices being equipped with integrated IP addresses and communication capabilities. These networked devices form the ‘Internet of Things’ (IoT). The buildings of the (near) future will be full of such devices, which can communicate with each other and with external systems to share and process data. Communication can go through the Internet but in many buildings it will be restricted to LAN connectivity, requiring cabling for ‘Distributed Building Services’ that will ultimately provide the connection. Some IoT devices will remain in one place, and can be plugged in to a socket, other IoT devices may be mobile and require wireless connectivity. Honeycomb When creating a converged network, introducing a honeycomb structure is ideal for accommodating wireless Local Area Networks. Here, generic cabling runs to the Service Concentration Point, after this, cabling is customised in line with the system to be installed. Network Concentration Equipment is installed to Wall SO SO Wireless access point coverage area SO SO SO SO r > or = 12m SO SO SO SO Converged network design: Service Area covered by service outlets (SO) which are arranged in a honeycomb structure. Wall SO SO SPECIAL FEATURE The table above shows the difference between the uplink speed from the Wireless Access Point to the switch (‘bit rate’) and the actual wireless speed provided to the user device (‘Max. throughput’). support different topologies. The predefined connection points for service outlets can be used for connecting WLAN access points, IP cameras or building management equipment (sensors, etc.). Power supply Of course, all of the devices in the network need to be powered. For devices physically connected to outlets, that can be done using Power over Ethernet, or PoE. This protocol allows electrical power to be sent along with data over Ethernet cabling. 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