Because the monitoring cable transmission distance is very short, we recommend network The monitoring network is preferably not more than 90 meters, even the simulation of 75-5 monitoring is commonly used, we also recommend that no more than 500 meters, so the monitoring distance should be used Optical fiber The mode of transmission, then from the following brief introduction of application of optical fiber in the video surveillance project in.
Optical fiber type
optical cable According to the use of different occasions, divided into indoor cable, outdoor cable, branch cable, optical cable.
Fiber can be divided into single-mode and multimode according to the transmission mode, so monitoring using single-mode fiber. Only a single mode optical fiber transmission mode optical signal of the optical fiber, the conventional G.652, G.653, G.654, G.655 and other transmission level classification, dozens of kilometers of single-mode fiber transmission distance up to 100m signal,. Multimode fiber: fiber optic transmission modes of the optical signal in the G.651 grade, according to the optical mode is divided into OM1, OM2, OM3, multimode fiber transmission fast signal far transmission distance of 2 km.
Fiber laying mode:
Conventional outdoor cable is a loose tube as the core of the container, as the most common optical fiber laying method.
As a common indoor cable sleeve type laying.
The core core cable also has a combination of laying fiber core in bands.
Cable structure:
The 1 most common cable structure layer stranded cable, 12 core cable is generally above the structure, optical cavity can accommodate a plurality of casing in casing as the basic unit, each casing can accommodate 6-12 cores; cengjiaoshi fiber optic cable as the center to strengthen the component, loose tube around the central reinforcing core figure:
For practical application, the core needs with different colors, a total of 12 colors, while the number of loose tube layer stranded cable in general is less than 12, so the number of core layer stranded cable is generally from the 12 core -144 core.
The structure below 2.12 core outdoor cable is generally used in the center beam tube type, this type of built-in cable comprising a central loose tube,
1-12 can contain a core, the outer sheath containing two parallel steel wire structure is as follows:
3 ribbon cable, also called skeleton groove structure in general as a large number of core cable structure, structure diagram as follows:
Optical fiber equipment
ODF (box): optical fiber terminal box is to protect the fiber and fiber, fiber to fiber connection transceiver The optical fiber switch, or.
Optical fiber terminal box (connecting box or fused fiber disc): optical fiber connection box is the two fiber splicing together.
A head and pigtail fiber fused fiber pigtail connected together, the other end is connected with the optical transceiver or optical switches.
