Outdoor optical cable is simply an optical cable used outdoors. It is a type of optical cable. It is called outdoor optical cable because it is most suitable for use outdoors. It is durable and can withstand the wind, sun, cold and freezing weather. , with thick outer packaging and some mechanical and environmental properties such as pressure resistance, corrosion resistance, and tensile resistance.
Commonly used outdoor optical cables are divided into two structures: center bundled tube type and layered optical cable: Bundle tube: The material of the bundle tube is PBT, which is hard but flexible and resistant to lateral pressure.Some small factories use PP instead of PBT, which can reduce the cost by half. However, during transportation and construction of optical cables, the optical fibers inside are easily broken.
The color of PP is translucent.
Colored optical fiber: In order to distinguish each core optical fiber in communication engineering, a layer of colored plastic is squeezed onto the bare fiber.
Outdoor optical cables dye each core of bare fiber with different colors of ink. The colors of the inks are the same as indoor cables, and there are 12 kinds. The industry standard chromatographic arrangement of the Ministry of Information Industry is as follows: blue, orange, green , brown, gray, original (white), red, black, yellow, purple, pink, green.
It is allowed to use natural colors instead of white without affecting recognition.
Color-locked optical fiber: In order to protect the optical fiber, the surface is covered with a layer of 250 micron translucent resin. When the optical fiber is made into an optical cable, each core fiber needs to be colored with a different color, so some optical fiber manufacturers abroad Enterprise, the optical fiber is coated with 12 different colors of resin during production, so that the optical cable factory does not need to color it when used.
The advantage of this is that it saves a coloring process, but the disadvantage is that it cannot flexibly distribute fibers during use.
Water-blocking tape: Water-blocking tape is made of water-blocking powder between two layers of non-woven fabric. Once the optical cable enters water, the powder will rapidly expand dozens of times after absorbing water, producing a jelly-like condensation. The glue blocks water from spreading deeper into the cable.
Non-woven fabrics: Some manufacturers will use non-woven fabrics that are much lower cost than water-blocking tapes instead of water-blocking tapes to reduce costs. There is no difference in appearance. Once the outer sheath of the optical cable is broken, the non-woven fabrics cannot Block water.
Corrugated steel strip: The water-blocking strip is covered with a corrugated steel strip. The main functions of the steel strip in optical cables are to resist lateral pressure, tensile strength, prevent rat bites, and protect the bundle tube.
Steel wire: We see two parallel steel wires outside the steel strip. The function of the steel wire is to enhance the tensile force of the optical cable.
The steel wire with a gray surface is phosphated, and the silver wire is galvanized to prevent the wire from rusting. Galvanized steel wire is more expensive than phosphated steel wire.
Sheath of optical cable: Outdoor optical cable generally uses medium density polyethylene (MDPE), and some customers also specify high-density polyethylene (HDPE).
The cost of using high-density PE is slightly higher.
There are also orders that specify low-smoke halogen-free materials (LSZH) as sheaths. Many manufacturers also use recycled materials to make optical cable sheaths to reduce costs.The surface of the optical cable made of this material is rough, contains a lot of impurities, and is easy to crack and leak water. The source of the recycled material is to crush some wire and cable sheaths, plastic bottles, slippers, etc. and re-granulate them.
