Optical fiber jumper (also known as optical fiber connector) means that both ends of the optical cable are equipped with connector plugs to realize the active connection of the optical path; one end with a plug is called a pigtail. Fiber optic jumpers are similar to coaxial cables, except that there is no mesh screen.
In the center is the glass core through which light propagates. In a multimode fiber, the diameter of the core is 50μm~65μm. The single-mode fiber core has a diameter of 8 μm to 10 μm. The core is surrounded by a glass envelope with a lower refractive index than the core to keep the optical fiber in the core. On the outside is a thin plastic jacket to protect the envelope.
The fiber jumper is the fiber connector that is connected to the optical module. There are many types, and they cannot be used mutually. The SFP module is connected to the LC fiber optic connector, and the GBIC is connected to the SC fiber optic connector..jpg)
The following is a simple analysis of several commonly used optical fiber connectors in network engineering:
1. FC type optical fiber jumper: The external strengthening method is a metal sleeve, and the fastening method is a turnbuckle. Generally used on the ODF side, the most used on the distribution frame.
2. SC type optical fiber jumper: the connector that connects to the GBIC optical module, its shell is rectangular, and the fastening method is a plug-in latch type, without rotation. Most used on router switches.
3. ST-type optical fiber jumper: often used in optical fiber distribution frame, the outer shell is round, and the fastening method is turnbuckle. For 10Base-F connections, the connector is usually of the ST type. Commonly used in optical fiber distribution frames.
4. LC-type optical fiber jumper: the connector for connecting the SFP module, which is made of a modular jack (RJ) latch mechanism that is easy to operate. Routers are commonly used.
The nanocrystalline core is a small part with magnetic permeability. The center of the nanocrystalline core has small nanocrystalline grains. The working principle of the nanocrystalline core is to absorb the common mode current in the cable through the principle of induction heating. And converted into heat to dissipate.
The use of common mode inductance of nanocrystalline core material can well suppress the peak voltage, thereby protecting sensitive components, while reducing the motor shaft voltage. Because of the unique characteristics of nanocrystalline cores, it is very useful in some high-power system industries. Good application.
Product performance of nanocrystalline cores:
In the field of electric energy meters, power meters, ammeters, electrical measuring equipment and other instruments and meters. Various types of power current transformers in power transmission and distribution power monitoring systems. Leakage protection, relay protection, servo motor protection, fire monitoring, etc.
Current and voltage data sampling, etc.
Application areas of nanocrystalline cores:
Mainly used to make miniature precision current transformers, power current transformers, Hall sensors, open-close current transformers, power transmitters, etc.
Nanocrystalline core terminals are used in:
Electric energy meters, power meters, ammeters, electrical measuring equipment and other instrumentation fields. Various types of power current transformers in power transmission and distribution power monitoring systems. Current and voltage data sampling for leakage protection, relay protection, servo motor protection, fire monitoring, etc.
scotch duct tape is made on the basis of the original BOPP film after high-voltage corona to make one surface rough, then coated with glue, and divided into small rolls after slitting. This is the tape we use daily. The glue of scotch duct tape is acrylic glue, also called pressure-sensitive adhesive, and the main component is tincture. Tincture is a kind of macromolecular active substance, and the temperature will have a certain influence on molecular activity. The tincture content of the glue directly affects the use of the tape. The initial adhesive force of normal sealing tape is between No. 13 (steel ball number). The thickness of this tape glue is generally 22 microns, which is a standard thickness.
Colored tapes are used for marking and masking purposes. Generally, beige and khaki are more common. Pinch the scotch duct tape and then quickly pull it apart, you can pull off the glue on one side, and you can see the purity and transparency of the original film.
In our lives, when we encounter scotch duct tape after using it for a long time, it will leave some traces. How should we deal with it?
1. Alternate covering of new and old transparent glue is an effective method. Just use new transparent tape to stick under the old tape. This method is more practical.
2. Wipe with an eraser. This is the method we all used when we were young. You can easily remove traces by wiping with an eraser where there is glue.
3. Skin care products. Some of the substances in it are very effective in removing the traces left by the transparent glue, but it should be noted that it is better to use expired skin care products, otherwise it is very wasteful.
4. Dishwashing liquid is also one of the tools to effectively remove the traces of transparent glue.