Classification and Analysis of Indoor Optical Cables
Generally, the indoor optical cables we see usually include the following types: vertical increase optical cables, single-core, dual-core interconnected indoor optical cables, optical cables for inflatable environments, and rodent-proof optical cables. So, what are the classifications of indoor optical cables?
Indoor fiber optic cable
(1) Vertically raise the optical cable
After the optical cable enters the building, it is necessary to provide the connection between the entrance equipment, equipment room or computer room and the communication cabinets on different floors, which is called "vertical wiring system". At this time, the wiring optical cable is mostly located in the vertical pipe (Riser) of the shaft between floors. For this reason, the optical cable needs to bear a greater tensile force (the maximum self-weight).
(2) Single-core, dual-core interconnecting indoor optical cables
Tight-sleeve single-core, tight-sleeve 8-core double-core, tight-sleeve 2-core to 4-core circular structure indoor optical cable. Because of the tight-sleeve structure with particularly good flexibility and the high-load aramid yarn surrounding the tight-sleeve optical fiber, the cable structure size Small size, good flexibility, can withstand a small bending radius, no inventory traces, it is used from optical fibers to workstations, patch cords, pigtails, and jumpers in communication cabinets, from communication cabinets to indoor wall terminals, and from the terminals to transceivers Ideal for interconnecting fiber optic cables.
They directly carry standard connectors, and play the role of interconnection between optical end equipment and trunk (vertical) optical cables in communication cabinets, distribution boxes, security boxes, and equipment boxes. This type of optical cable is convenient and basic to install in a limited space, and becomes an ideal network cable solution for limited space wiring and flexible cords in buildings.
(3) Optical cable for inflatable environment
In indoor use, when the optical cable needs to pass through the transmission pipeline, high-pressure air-filled space or air handling system to transmit information, it is necessary to use the Plenum grade indoor optical cable. This special operating environment puts forward more stringent requirements for the flame retardancy and corrosion resistance of the optical cable.
Therefore, the tight sleeve material and outer sheath material of the indoor optical cable used are more strict, the tight sleeve is PVC material, and the outer sheath material is PVC material or hard fluoropolymer with flame retardant added in line with UL certification. Engineered with PVC over fluoropolymers. Because PVC is soft and easy to bend, there is no inventory trace, and it can be stored in a circle.
(4) Anti-rodent optical cable
The single-core or multi-core tight-buffered fiber optic cables protected by stainless steel hoses have strong lateral pressure resistance, bending resistance, high tensile strength, and excellent rodent resistance. It can be used in occasions where trampling occurs, such as laying under the carpet or where the limited space needs to be bent frequently or there are rodents.
In addition, there are several matters: First, when the optical fiber ribbon cable is used to enter the building, the matching indoor optical fiber ribbon cable (fiber ribbon + aramid yarn + PVC sheath structure) can be selected. Second, when the underground pipes and ceilings are buried in the equipment room, the reinforced structure can be used. For example, PE and PU sheaths are basically used for the distribution cables, or aluminum-PE sheaths are basically used for the scattered cable structures. set structure, etc.
Third, when the distribution cable adopts metal armored sheath, it can be used for overhead and direct buried laying. Fourth, low smoke halogen free (LSZH) materials can be used as the outer sheath in occasions with high requirements on toxicity and smoke emission. Fifth, the PU sheath has better resistance to friction, scratches and chemical erosion, and can be used for emergency, emergency repair and military optical cables.