Issue link: http://www.epageflip.net/i/1043933
12 I ICT TODAY with standards. An often-overlooked aspect is that it also allows all standard applications, including Wi-Fi and PoE. It is also based on standard active equipment. The enclosures are available in a variety of options, including traditional wall mount, shallow vertical wall mount, and even ceiling and raised floor versions. Electrical and IT redundancy, if needed, can be easily provided to the zone enclosure. Pushing to FTTO Since we can bring fiber closer to the user and avoid placing equipment in the TR, why not go even further into the office space by going straight to the desk? However, fiber-to-the-desk (FTTD) has already been implemented many times. With the exception of very niche applications, such as security or protection from EMI, it has never really succeeded because all devices come with copper ports, not fiber. The fiber-to-the-outlet (FTTO) solution (Figure 5) simply uses a mini-switch in the outlet, connected to the fiber. This ensures that the user does not have access to the fiber and all equipment can be connected on copper. In this solution, the mini-switch generally has one fiber connection on the side, and four or five copper ports (with sometimes PoE) in the front. It combines most advantages of the FTTZ with a few more including: • No copper cabling. • Even less cable management. • No zone enclosures to manage. • With a standard transceiver port, the solution can be based on either multimode or singlemode fiber depending on the transceiver chosen. However, there are drawbacks: • Dependence on local power supply for the mini switch. • Standards compliance: unless to the floor directly above or below for low density, it is generally prohibited to extend the horizontal cabling into the backbone. Therefore, it is required that the horizontal fiber cables be spliced onto backbone cables in the TR. While this is not complicated, it can be overlooked and create fire risks. • MACs: having placed the cabling so close to the user, FIGURE 5: An example of an FTTO design. 24 mini switches with: ○ 1x Fiber port Gigabit ○ 4x RJ45 PoE Gigabit Cabinet for BD equipped with: ○ Fiber panels for 5x 48-cores ○ 1x Switch 120 ports Fiber 48-core fiber cables to each of 5 floors. Splice box for 24 cables 2-cores. Typical Floor F D B D 24 fiber cables To other 4 FDs Corridor Office area Work area