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Optical fiber is a shorthand for optical fiber. It is a fiber made of glass or plastic and can be used as a light-conducting tool. The transmission principle is 'total reflection of light'. The number of fiber cores is related to the device interface of the fiber optic connection and the signalling mode of the device. Generally speaking, the number of optical cores in the optical cable is the total number of device interfaces multiplied by 2, plus 10% to 20% of the spare number, and if the communication mode of the device is serial communication and device multiplexing, Can reduce the number of fiber cores.
Determination of the number of cores
According to the IBDN standard, it is generally recommended that each communication room has 12 cores and the building has 24 cores. You can think about it this way: first know the number of routing points in the layer, calculate the number of switches, whether the connection between the switches is stacked or not. If the core switch is dual-system hot standby redundancy, the 6-core is sufficient. (2 cores each use 2 cores, 2 cores redundant). If you don't stack, one switch needs 4 cores, and many switches multiply by 4 plus 4 cores of redundancy.
Experience: Each floor wiring closet (horizontal wiring cabinet) has one fiber.
Generally six cores: two cores, two cores, two cores; eight cores.
Noun remarks:
Redundancy: As long as it is more than used, the extra is called redundancy;
Master and standby: one used, the other one is the same as the standby;
Hot backup: both in working state
Cold backup: The backup device is in standby state
1. Under normal circumstances, there are several terminals that require several cores. However, the actual scheme design and construction will consider redundancy. Therefore, more than two cores will be used for each terminal. The cost can also be considered as the entire line redundancy. Core, for example, if you have three fiber access switches, you need to have three cores (the actual use of four-core fiber optic cable), because in addition to the one-core fiber, there is basically no single-core fiber cable, such as: three core, five core, etc. Of course, it is not absolutely that only one optical core can only be connected to one terminal device, and multiple terminals can be connected in series on one optical core, but this requires multiple welding, and the light attenuation is large, and long-distance transmission cannot be realized.
2, single-mode and multi-mode problem: multi-mode is actually a light core can transmit multiple data at the same time, while single-mode can only transmit one-way data at the same time, so the quality and distance of single-mode transmission are better than multi-mode. Therefore, single mode is often used for outdoor transmission over long distances.
3, first of all, there are several systems that use fiber optics. For example, an optical node, the application system has network, monitoring. Among them, the network only needs one route and needs to occupy two core fibers; the monitoring has 4 channels of images, and a 4-channel video optical transceiver needs to be installed, which requires occupying one core fiber. From the equipment room to the optical node, a total of three core fibers are required. The optical cable is designed from the equipment room to the optical node as a 6-core optical cable, of which three cores are redundant. From the perspective of cost, build a single mode fiber optic cable. In fact, a 6-core single-mode fiber cable should be pulled to the optical node.
February 14, 2020