Broadband Communities

OCT 2018

BROADBAND COMMUNITIES is the leading source of information on digital and broadband technologies for buildings and communities. Our editorial aims to accelerate the deployment of Fiber-To-The-Home and Fiber-To-The-Premises.

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O C T O B E R 2 0 1 8 | w w w. b r o a d b a n d c o m m u n i t i e s . c o m | B R O A D B A N D C O M M U N I T I E S | 3 7 drop cables. FDTs are placed on every floor or every other floor. However, some networks do not include these terminals. 4 Drop cable runs from an FDT to a living unit. In some networks, the riser and drop cables are the same cable, running up the riser and down the hall. 5 In-unit network cabling consists of the fiber components in each living unit. All conduits and cables must meet appropriate flame and smoke ratings. e National Electrical Code (NEC) is a main source of information regarding requirements, although local codes may also apply. SPACES Spaces are needed in a building to house various pieces of equipment and connection points. • Cable entrance into the building and telecom closet or FDH location – For the building entrance, aerial access requires building attachment capability and an entrance hole into the building. Underground access requires a conduit (2 inches or larger preferred) from outside to inside, preferably to the telecom closet. Sharp bends in the duct should be minimized. e duct must meet minimum bend radius/ diameter requirements. e majority of outdoor-rated fiber optic cables have a minimum bend diameter of 20 times the cable outside diameter. – Fiber connections and equipment are typically located in a dedicated electrical or telecom closet, often on a low floor in the building with access to riser spaces. – Equipment can be mounted either on the wall or in an electronics rack (typically 19 inches wide). – A backboard roughly 4'W x 8'H x 3/4"D, in accordance with NEC or other codes, can be helpful to facilitate installations on walls. Equipment will extend roughly 30 inches when installed on the backboard. – Power and HVAC services will be helpful if the service provider plans to install active electronics in the closet. • Terminal or patch panel locations – FDTs or patch panels used to connect riser cables to drop cables are typically housed in closets that have access to the riser or in the stairwell. ey can be on every floor, on every other floor or in some other arrangement, depending on the design of the building and network. Some networks don't have them. – Terminals on a floor are most often wall-mounted. A backboard, roughly 2'W x 2'H x 3/4"D, in accordance with NEC or local code, can be helpful. PATHWAYS Pathways for fiber placement are critical. e fiber pathways needed to new buildings versus already occupied buildings can be quite different from one another. Pathways can be either indoors or outdoors, are typically designated as "riser" or "drop," and must be large enough to accommodate the cables needed to reach living units. ere can be different pathway scenarios for different building designs. Figure 1: Typical FTTU archictecture Figure 2: A typical FDH Figure 3: A fiber distribution terminal

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