Common types of jumpers
There are computer board jumpers, optical fiber jumpers, network jumpers, etc.
The "jumpers" of the internal boards of the computer are small metal rods (jumper posts) embedded on the motherboard, sound card, hard disk and other equipment, and small clips (jumper clips) on these metal rods. The function of the jumper is to adjust the on-off relationship of different electrical signals on the device, and to adjust the working state of the device, such as determining the motherboard voltage, the master-slave relationship of the driver, and so on. When the jumper clip is covered with two jumper posts at the same time, it means that the two jumper posts are connected. If only one or not covered, it means that it is disconnected. It is very important to adjust the jumper. If the jumper is wrong, it will crash, or even burn the entire device. Therefore, when adjusting the jumper, be sure to read the manual carefully, check the name of the jumper, the number of the jumper column and the on-off relationship.
The jumpers on the motherboard generally include CPU setting jumpers, CMOS clear jumpers, BIOS write prohibit jumpers, etc. Among them, the CPU setting jumper is the most complicated. If the motherboard is relatively old, the core voltage, FSB, and frequency multiplier jumpers must be set on the motherboard. Set the above corresponding jumpers according to the motherboard manual and CPU frequency. Under normal circumstances, the corresponding CPU voltage on the motherboard is a set of jumpers, each jumper corresponds to a voltage value, find the appropriate voltage value, insert a keycap to short it, and select this voltage value. In the same way, find the FSB jumper and the multiplier jumper, and set the appropriate FSB and multiplier respectively. Note that only one jumper in each group of jumpers can be selected for shorting.
The jumper here refers to the copper connecting wire, which is made of standard jumper cable and connecting hardware. The jumper cable has copper cores ranging from two to eight cores, and the connecting hardware is two 6-bit or 8-bit modular plugs. , or they have one or more bare wire ends. Some jumpers have a modular plug on one end and an 8-position modular slot on the other, or are fitted with 100P patch cords, MICs, or modular slots. Jumpers are used to connect various links on the patch panel, and can be used as patch panels or equipment connection cables. Both ends of the modular jumper are RJ45 connectors, adopt TIA/EIA-568A pin structure, and have a flexible plug-in design to prevent loosening and jamming. Patch cords are available in lengths from 1 foot (0.305 m) to 500 feet (15.25 m), with 3, 5, 7 and 10 foot lengths being the most common. Modular patch cords are used in the work area and also as patch cords in the wiring closet. In small office network or home network DIY installations, dual-connection jumpers are often mentioned. This kind of jumper is not a standard jumper used in integrated wiring, but a special hardware device connection cable. It is used when two PCs are directly connected by a twisted pair, or when two HUBs are connected through the RJ45 port. , you need a crossover (commonly known as cross-connect line, jumper). It follows a special connection order.
Domestic situation of optical fiber connector
At present, with the continuous development of the domestic communication industry, optical fiber communication has entered the stage of practical application, and the scope of application is getting wider and wider. For optical fiber connectors used in optical communication systems in my country, either imported connectors are used, or so-called "parts" such as imported ceramic sleeves and peripheral metal parts are assembled in China, or according to the imported foreign technology and Key equipment is produced, mainly FC-type fiber optic connectors. In view of this situation, the author recommends the following.
General structure of optical fiber connector
The main purpose of fiber optic connectors is to connect optical fibers. Optical fiber connectors, which have been widely used in optical fiber communication systems, have many types and different structures. But on closer inspection, the basic structure of various types of fiber optic connectors is the same, that is, most fiber optic connectors are generally realized by high-precision components (composed of two pins and a coupling tube). Alignment of optical fibers.