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Basic means and methods of identification of optical cable products

Update:29-10-2020
Summary:

With the continuous advancement of network technology, […]

With the continuous advancement of network technology, optical fiber and cable products have been continuously used in large-scale applications such as telecommunication network construction, national information highway construction, and FTTH fiber to the desktop. At this time, our requirements for the quality of fiber optic cables are getting higher and higher, so what are the quality related issues of fiber optic cables? How to check.

1. Check the manufacturer’s qualifications and corporate background. It mainly depends on whether it is a major manufacturer or brand, whether it is committed to the research and development and production of optical cable products, whether there are many successful cases, whether it has ISO9001 quality system certification, ISO4OO1 international environmental system certification, whether it meets the ROHS directive, whether there are relevant domestic and international organizations Certification. Such as the Ministry of Information Industry, Thiel, UL and other certifications.

2. Check the product packaging. The standard length of optical cable supply is generally 1km, 2km, 3km, 4km and customized length specifications. Positive and negative deviations are allowed. The deviation range can refer to the factory standard. Check the outer sheath of the optical cable, whether it has obvious marks such as the number of meters, the name of the manufacturer, and the type of the optical cable. Generally speaking, the factory optical cable is wound on a solid wooden reel and protected by a wooden sealing plate. The two ends of the optical cable are sealed. The following marks are on the optical cable reel: product name, specification, reel number, length, net/gross weight, date, A/ End B signs, etc.; check the optical cable test record, there are normally two copies, one with the cable reel on the inside of the wooden tray, the optical cable can be seen by opening the wooden tray, and one fixed on the outside of the wooden tray.

3. Check the cable sheath. The outer sheath of the indoor optical cable is generally made of polyethylene, or flame-retardant polyethylene, or low-smoke and halogen-free materials. The high-quality appearance is smooth and shiny, and the hand feels good. Has good flexibility and easy to peel off. The outer skin of a poor quality optical fiber cable is not well-finished. When peeled off, the outer skin is easy to adhere to the tight sleeve and aramid inside. Note that some products use sponge instead of aramid material. The PE sheath of the outdoor optical cable should be made of high-quality black polyethylene. After the cable is formed, the outer skin is smooth, bright, uniform in thickness, and free of small bubbles. The outer skin of poor quality fiber optic cable feels bad, the outer skin is not smooth, and some printing is easy to be rubbed. Due to the raw materials, some optical cables have a poor degree of compactness, and moisture can easily penetrate.

4. Check the steel wire for reinforcement. Many structural outdoor optical cables generally contain steel wires for reinforcement. According to the technical requirements and production requirements, the steel wire in the outdoor optical cable needs to be phosphated, and the surface is gray. After the cable is formed, there is no increase in hydrogen loss, no rust, and high strength. However, some optical cables are replaced by iron wires or even aluminum wires, and the metal appearance is white, and the bending resistance is poor. In addition, you can also use some simple methods to identify, such as open the fiber optic cable in the water for a day, take it out for comparison, and immediately reveal the original shape. As the saying goes: real gold is not afraid of fire. Here I want to say "phosphorus steel is not afraid of water soaking".

5. Check the steel armored steel tape with longitudinal wrapping pattern. Regular manufacturers generally use longitudinal bandage steel strips painted with anti-rust coatings on both sides, and have good ring-wrap joints, which are relatively strong and precise. However, we also found that some optical cables on the market use ordinary iron sheet as the armor tape, usually only one side is treated with rust prevention, and the thickness of the longitudinally wrapped steel strip is obviously inconsistent.

6. Check loose tube. Regular manufacturers generally use PBT materials to make loose tubes for holding fiber cores. This material is characterized by high strength, no deformation, and anti-aging. Some products use PVC material for loose tube. The disadvantage of this material is that it has poor strength, can be flattened, and is easy to age. Especially for some optical cables with GYXTW structure, when the outer sheath of the optical cable is peeled with a cable opener, the loose tube of the PVC material will be deformed, and some will even fall off with the armor, and even the fiber core is also pulled together. Off.

7. Check the fiber paste. The fiber paste in the outdoor fiber optic cable is filled in the loose tube to prevent water from directly contacting the fiber core. It is important to know that once moisture and moisture enter, it will seriously affect the life of the optical fiber. The relevant national regulations have specific requirements for the water blocking of optical cables. In order to reduce costs, some optical cables use less cable paste. So be sure to check whether the fiber cream is full.

8. Check Aramid. Aramid, also known as Kevlar, is a high-strength chemical fiber that can effectively prevent external forces and play a very good protective role. At present, only a few companies in the world can produce such products, which are expensive. Many large manufacturers’ optical cables use aramid yarn as reinforcement. Of course, the cost of aramid is relatively high. Therefore, some indoor optical cables will make the outer diameter of the cable very thin to reduce the amount of aramid used, or simply use domestic sea Cotton replaces aramid. The appearance of this product is very similar to aramid, so some people call it "domestic aramid". However, the fire rating and tensile performance of this product are not up to the technical indicators of regular aramid fiber, so the tensile resistance of this type of optical cable is a challenge during pipe-through construction. "Domestic aramid" has poor flame retardancy and melts in fire, but regular aramid is a flame-retardant product with high toughness.

Nine, check the fiber core. The optical fiber core is the core part of a real optical cable. The points discussed above are to protect the core of the transmission. At the same time, it is also the most difficult part to identify without the aid of an instrument. It is impossible to distinguish whether it is single-mode or multi-mode with your eyes; you cannot distinguish whether it is 50/125 or 62.5/125; you cannot distinguish whether it is OM1, OM2, OM3, or zero water peak, let alone its gigabit, 10,000 Mega applied. It is best to recommend that you use high-quality fiber cores from regular large optical cable manufacturers.

https://www.nb-fibercome.com/product/fiber-box/

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