Optical fiber laying methods and requirements
Conventional outdoor optical fibers use loose tubes as the core container, which is the most common way of laying fiber cores; indoor optical fibers are usually laid in tight sleeves; the cores of large-core optical fibers are also laid in strips in combination. core.
Optical fiber laying requirements: the bending radius of the optical fiber should be at least 15 times the outer diameter of the optical fiber, and should be at least 20 times during the construction process; when laying the optical fiber, the rotation of the optical fiber reel should be synchronized with the laying speed, and the speed of the optical fiber index is generally 15 meters per minute; when laying out the optical fiber, keep a loose radian at the outlet of the optical fiber, and reserve a buffer margin, and it should not be too much to avoid back buckling of the optical fiber; the reserved length of the optical fiber at both ends is 5-10 meters ; When laying optical fibers, labels should be made and the laying-out records should be filled in; all optical fibers should not be exposed.
Fiber laying scheme
Optical core selection
The core count is the number of glass fibers contained in each fiber. The following editor will introduce some methods to determine the number of fiber cores.
First of all, clearly know the number of wiring points on this layer, calculate the number of switches, and whether the connections between switches are stacked or not. If stacking, if the core switch is dual-machine hot standby redundancy, 6 cores are enough (2 cores each use 2 cores, 2 cores are redundant). If you do not need to stack a switch with 4 cores, multiply the number of switches by 4 and add 4 cores for redundancy. (Note: Redundancy: as long as it is more than used, the excess is called redundant primary backup: one is used, and the other is exactly the same as backup; hot backup: both are working at the same time; cold backup: the backup device is in standby mode.)
Empirical practice: In the wiring room (horizontal wiring cabinet) of each floor, set up an optical fiber, generally six cores: two cores for use, two cores for backup, and two cores for redundancy; some use eight cores of optical fiber. The minimum configuration of the specification is 2 cores per 48 points. Of course, 4 cores can be selected for 48 points, because 2 cores are the smallest unit of optical fiber, and it is more appropriate to reserve 2 cores as backup.
