Rectangular Magnets are six-sided magnet with straight sides where all angles are right angles (90°). Opposite sides of the magnet are parallel. They are commonly used in holding applications where they fit within a channel to increase their holding force. We carry a selection of different shapes and sizes and can manufacture magnets to our customers' specifications. Rectangular Magnets Rectangular Magnets,Neodymium Rectangular Magnets,N35 Rare Earth Ndfeb Neodymium Rectangular Magnet Jinyu Magnet (Ningbo) Co., Ltd. , https://www.magnetbonwin.com
At present, there are many foreign and domestic manufacturers of fiber optic transceivers, and the product line is extremely rich. In order to ensure full compatibility with network devices such as network cards, repeaters, hubs, and switches of other manufacturers, fiber transceiver products must strictly comply with the IEEE802.3 Ethernet standard. In addition, EMC protection against electromagnetic radiation should comply with the FCC. And related regulations of CE, such as fiber optic transceivers of Fiberhome Networks have passed FCC and CE certification. Nowadays, as major domestic operators are building community networks, campus networks, and enterprise networks, the amount of fiber transceiver products is constantly increasing to better meet the construction needs of access networks. With the rapid development of information construction, people are increasingly demanding for multimedia communications such as data, voice, and images, and Ethernet broadband access methods have been mentioned more and more importantly. However, the traditional Category 5 cable can only transmit 100 meters of Ethernet electrical signals, which can no longer meet the needs of the actual network environment in terms of transmission distance and coverage. At the same time, optical fiber communication has been widely used in large-scale networks such as wide area networks due to its advantages of large information capacity, good confidentiality, light weight, small size, no relay, long transmission distance, and the like. In some large-scale enterprises, when the network is built, the optical fiber is directly used to establish the backbone network for the transmission medium. The transmission medium of the internal LAN is generally a copper line. How to connect the LAN to the fiber backbone network? This requires switching between different ports, different lines, and different fibers and guarantees link quality. The emergence of fiber optic transceivers converts twisted pair electrical signals and optical signals to ensure smooth transmission of data packets between two networks. At the same time it extends the transmission distance of the network from 100 meters to more than 100 kilometers (single-mode fiber).
Structure <br> <br> optical transceiver optical transceiver comprises three basic functional blocks: a photoelectric converter chip medium, an optical signal interface (optical transceiver module) and the electrical signal interface (the RJ45), if equipped with a network management function is further comprising Network management information processing unit. 
The main performance indicators of the photoelectric medium conversion chip are:
1. Network management function Network management is a guarantee of network reliability and a way to improve network efficiency. The functions of network management such as operation, management, and maintenance can greatly increase the available time of the network, improve network utilization, network performance, service quality, and security. And economic benefits. However, the manpower and material resources required for the development of Ethernet-based optical fiber transceivers with network management capabilities far exceed those of similar products without network management. The main performances are:
(1) Hardware investment. The realization of the network management function of the Ethernet optical fiber transceiver needs to configure the network management information processing unit on the transceiver circuit board to process the network management information. The unit uses the management interface of the media conversion chip to obtain the management information. The management information and common data on the network share the data channel. Ethernet optical fiber transceivers with network management functions have more types and quantities of components than non-network management products. Accordingly, wiring is complicated and the development cycle is long. Fiberhome Networks is committed to the development of optical fiber transceiver products for a long time. In order to optimize the design of products, make products more stable, enhance product functions, and independently develop fiber-optic transceiver media conversion chips, the integration of products is higher, and the number of products is effectively reduced. Destabilizing factors caused by the cooperative operation of various chips. The newly-developed chip has many highly practical functions such as optical line quality on-line testing, fault location, and ACL, which can effectively protect user investment and greatly reduce user maintenance costs.
(2) Software investment. In addition to hardware cabling, software programming is even more important. The development workload of network management software is large, including the graphical user interface, the embedded system part of the network management module, and the information processing unit of the transceiver circuit board. Among them, the embedded system of the network management module is particularly complex, and the threshold for research and development is relatively high. It requires the use of embedded operating systems such as VxWorks, Linux, and so on. Need to complete the SNMP agent, telnet, web and other complex software work.
(3) Commissioning work. There are two parts to the commissioning work of the network management Ethernet optical transceiver: software debugging and hardware debugging. During the debugging process, any factors in the circuit board layout, component performance, component soldering, PCB board quality, environmental conditions, and software programming can affect the performance of the Ethernet fiber optic transceiver. The commissioning personnel must have comprehensive qualities to fully consider the various factors of failure of the transceiver.
(4) Personnel input. The design of a common Ethernet fiber transceiver can be accomplished with only one hardware engineer. The design work of the Ethernet fiber transceiver with network management function not only requires the hardware engineer to complete the circuit board wiring, but also requires many software engineers to complete the network management programming, and requires the hardware and software designers to cooperate closely.
2. Compatibility OEMC should support IEEE802, CISCOISL and other common network communication standards to ensure good compatibility of Ethernet optical transceivers.
3. Environmental requirements a. Input and output voltages. The operating voltage of the OEMC is typically 5 volts or 3.3 volts, but the other major component of the Ethernet fiber optic transceiver, the optical transceiver module, has a working voltage of 5 volts. If the operating voltages of the two are inconsistent, it will increase the complexity of PCB layout.
b. Operating temperature. When selecting the operating temperature of the OEMC, developers need to leave room for the most unfavorable conditions, such as the maximum temperature of 40°C in the summer, and the interior of the Ethernet fiber optic transceiver chassis heats up due to various components, especially the OEMC. Therefore, the upper limit of the operating temperature of Ethernet fiber transceivers should not generally be lower than 50°C.
(1) Hardware investment. The realization of the network management function of the Ethernet optical fiber transceiver needs to configure the network management information processing unit on the transceiver circuit board to process the network management information. The unit uses the management interface of the media conversion chip to obtain the management information. The management information and common data on the network share the data channel. Ethernet optical fiber transceivers with network management functions have more types and quantities of components than non-network management products. Accordingly, wiring is complicated and the development cycle is long. Fiberhome Networks is committed to the development of optical fiber transceiver products for a long time. In order to optimize the design of products, make products more stable, enhance product functions, and independently develop fiber-optic transceiver media conversion chips, the integration of products is higher, and the number of products is effectively reduced. Destabilizing factors caused by the cooperative operation of various chips. The newly-developed chip has many highly practical functions such as optical line quality on-line testing, fault location, and ACL, which can effectively protect user investment and greatly reduce user maintenance costs.
(2) Software investment. In addition to hardware cabling, software programming is even more important. The development workload of the network management software is large, including the graphical user interface, the embedded system part of the network management module, and the information processing unit of the transceiver circuit board. Among them, the embedded system of the network management module is particularly complex, and the threshold for research and development is relatively high. It requires the use of embedded operating systems such as VxWorks, linux, etc. Need to complete the SNMP agent, telnet, web and other complex software work.
(3) Commissioning work. There are two parts to the commissioning work of the network management Ethernet optical transceiver: software debugging and hardware debugging. During the debugging process, any factors in the circuit board layout, component performance, component soldering, PCB board quality, environmental conditions, and software programming can affect the performance of the Ethernet fiber optic transceiver. The commissioning personnel must have comprehensive qualities to fully consider the various factors of failure of the transceiver.
(4) Personnel input. The design of a common Ethernet fiber transceiver can be accomplished with only one hardware engineer. The design work of the Ethernet fiber transceiver with network management function not only requires the hardware engineer to complete the circuit board wiring, but also requires many software engineers to complete the network management programming, and requires the hardware and software designers to cooperate closely.
Rate divided by <br> <br> can be divided into single-10M, 100M, 1000M optical transceivers, 10 / 100M adaptive, 10/100 / 1000M adaptive optical transceivers. Most of the single 10M, 100M, and 1000M transceivers work in the physical layer. Transceiver products working in this layer forward data in bits.
The forwarding method has the advantages of fast forwarding speed and low delay, and is suitable for being applied to a fixed-rate link. The 10/100M, 10/100/1000M optical transceivers work at the data link layer and use a store-and-forward mechanism. In this way, the forwarding mechanism must read its source MAC address and destination MAC address for each received packet. The address and data payload, and after the completion of the CRC cyclic redundancy check, the data packet is forwarded out.
The benefits of store and forward can prevent some wrong frames from propagating in the network and occupy valuable network resources. It can also prevent data packet loss caused by network congestion. When the data link is saturated, store and forward can not The forwarded data is first placed in the buffer of the transceiver and is forwarded when the network is idle. This not only reduces the possibility of data collisions but also guarantees the reliability of data transmission. Therefore, 10/100M, 10/100/1000M fiber transceivers are suitable for operating on links with unfixed rates. 
Fiber Transceiver development <br> <br> As the demand for network capacity increases rapidly, the demand for network operators to manage the increasing escalation of Ethernet transmission speed optical transceiver type and complexity are At an alarming rate.
Due to the reduction in the cost of fiber optic technology and the increase in capacity requirements, many telecommunications companies, local governments, and even large enterprise groups have begun to apply fiber optic technology to urban area network (MAN) applications. Therefore, optical link technologies that were once limited to long-distance and high-end backbone networks are now available everywhere in the network infrastructure. However, the rapid increase in the number of fiber link applications has also led to a wide variety of, and sometimes even conflicting, fiber transceivers.
Fiber optic transceiver component selection <br> <br> Ethernet optical transceiver design, choose a pivotal component, which determines the performance, life and cost. The optoelectronic media converter chip (OEMC) is the core of the entire transceiver. Selecting the media conversion chip is the first and very important step in the design of Ethernet fiber transceivers. Its choice directly affects and determines the choice of other components.
These Sintered NdFeB magnets are particularly suitable for high volumn production of a wide variety of shape and size ranges. Ni, Zn or customized coated surface protection. Precise dimensional control is achieved in both processed and usually the component does not require futher machining. NdFeb magnets have been widely used in high performance stepper, DC, servo, and linear motors, actuators, loudspeakers, headphones, instrumentation, switches, relays, magnetic imaging for medical and geophysical applications, holding systems, magnetic bearings, magnetic couplings, hard disk drives, etc.
Neodymium Rectangular Magnets are very strong, but very sensitive to temperature and corrosion. To combat temperature we can help you to select the grade that is appropriate for the operating temperature that you may require. To combat corrosion, neodymium magnets are coated on the outside. Most commonly they will be coated with nickel-copper-nickel, but can also be coated with epoxy, gold and parylene.
It is important to know that neodymium magnets are very hard and brittle and can break if they are dropped. Neodymium magnets can be assembled into products that use strong adhesives, but contact surfaces should all be clean and dry before bonding.
Block (or bar) magnets have completely flat surfaces that are perpendicular (at right angles) to each other, and are available in all scales from cubes through to long rectangular prisms.
The dimensions for blocks are Length x Width x Height (mm).
Block magnets feature straight edges and are available in all proportions from cubes through to flat rectangular bars. Rare Earth blocks are available in sizes from approx 6mm length up to 100mm length, with pull strengths exceeding 100kg.
The principle and role of fiber optic transceivers
A fiber optic transceiver is an Ethernet transmission media conversion unit that exchanges short-distance twisted-pair electrical signals and long-distance optical signals, and is also called a photoelectric converter in many places. In the information infrastructure construction, enterprises usually pay more attention to optical fiber transceivers, which are Ethernet transmission media conversion units that exchange short-distance twisted pair electrical signals and long-distance optical signals. It is called a photoelectric converter. When enterprises conduct information infrastructure construction, they usually pay more attention to routers, switches, even network cards and other network equipment used for node data exchange. However, they often ignore the non-network core but essential equipment such as media conversion. In particular, in some government agencies and enterprises that require high degree of informatization and large data traffic, the network needs to be directly connected to the backbone network that uses optical fibers as the transmission medium. The transmission medium of the internal LAN of the enterprise is generally a copper line. A media conversion device that smoothly transmits data packets between different networks becomes a necessity.