1. Multimode fiber transceiver, multimode fiber
Optical fiber transceiver is an Ethernet transmission medium conversion device that exchanges electrical and optical signals of Ethernet, and the optical fiber that transmits data on the network is divided into multi-mode optical fiber and single-mode optical fiber. The core diameter of multi-mode optical fiber It is 50~62.5μm, the outer diameter of the cladding is 125μm, and the core diameter of the corresponding single-mode fiber is 8.3μm, and the outer diameter of the cladding is 125μm. But these technical data are not very intuitive to us, in fact, we need to distinguish multimode Fiber and single-mode fiber, just look at the color. The color of the multimode fiber pigtail (that is, the line from the terminal box to the fiber optic transceiver) is orange, as shown in Figure 1
ZR Cable Multimode Fiber
The color of the single-mode fiber pigtail is yellow:
single mode fiber
In terms of networking applications, since multi-mode fiber cannot carry out long-distance transmission, it can only be used for networking within and between buildings. However, because multi-mode fiber and the corresponding fiber transceiver are relatively cheap, it is still within a certain range has been applied. For example, the integrated wiring in the office building of Xiangzi's unit uses multi-mode optical fibers. In addition, many schools also use multi-mode optical fibers when building internal campus networks.
2. Single-mode fiber optic transceiver series
With the advancement of technology, single-mode fiber has begun to enter long-distance networking operations (from a few kilometers to more than 100 kilometers), and the development momentum is very rapid. In a few years, high-end applications have entered the homes of ordinary people. Judging from the projects undertaken by Xiangzi, some key customers now use optical fiber transceivers (the so-called FTTH mode, fiber-to-the-home) when they open the network at home. The use of optical fiber transceivers for networking has become a very important factor for radio and television to develop value-added services. a common form. The various types of fiber optic transceivers described below are all based on single-mode fiber.
(1) Dual fiber single network port
The so-called dual-fiber single-port optical fiber transceiver uses two optical fibers (one for receiving and one for transmitting), and a group of optical transceivers realizes the conversion of electrical signals to optical signals, optical signals to electrical signals:
The network equipment here may be a switch or a server, so whether the network cable output by the fiber optic transceiver is a straight-through cable or a crossover cable, this question was a big problem at the time. Xiangzi had to read the manual every time to check The model introduced in the manual is a straight-through cable or a crossover cable for a server or a switch, but later with the accumulation of networking experience, a rule was found, that is, the optical fiber transceiver can be viewed as a PC. The connection between the computer and the switch is a straight-through cable, and the connection between the PC and the server is a cross-over cable, then the optical fiber transceiver and the switch are connected as a straight-through cable, and the connection with the server is a cross-over cable. Of course, with the advancement of technology, the network port of the fiber optic transceiver is generally made into an adaptive mode (automatically matching the crossover cable and the straight-through cable), which is also much more convenient for engineering use.
(2) Single fiber single network port
With the continuous development of our business, we are faced with an unavoidable problem, that is, the shortage of optical fiber resources. Some units need to be connected to the Internet, but there is only one available optical core on the line. What should we do at this time? Fortunately, with the technology With the progress of optical fiber, manufacturers have also developed new products, that is, single-fiber optical fiber transceivers, that is, on one optical core (one optical fiber will contain several optical cores, and the number will increase from 2 to the nth power) to achieve receiving, This type of product uses wavelength division multiplexing technology, and the wavelengths used are mostly 1310nm and 1550nm, that is, one end uses 1310nm wavelength light to represent transmission, 1550nm wavelength light represents receiving, and the other end uses 1310nm wavelength. The light represented by 1550nm wavelength represents the hair.
Generally speaking, if the fiber optic transceiver is placed in the computer room, we tend to choose this fiber optic transceiver. First, the quality of this structure is relatively stable, and second, this modular structure can be placed in the computer room by placing it in the equipment room. The chassis is used to realize the centralized placement of optical transceivers. For example, a 16-slot chassis can place 16 optical transceivers at a time.
This centralized device provides the conditions for us to use optical fiber transceivers to form a large-scale network. In fact, we form a network for local education, public security, banks and other units, and this kind of frame type is used in the central computer room. Fiber Transceiver.
(3) Single fiber dual network port
With the development of business, some units have put forward higher requirements for the use of fiber optic transceivers for networking. For example, in the networking we provided for a local bank, the bank required us to provide two strictly isolated Ethernet lines. The optical fiber transceiver equipment used should be technically mature and safe, which can simplify the network structure, save equipment investment, and achieve two business networks with strict isolation and security requirements through one optical fiber, so as to save optical fiber resources to the greatest extent.
The Ethernet electrical port of the device is a 10/100M self-adaptive port, and the optical path can realize the access capability of the Ethernet link up to 60 kilometers, and supports the central office network management function. Under the network management platform, it can realize comprehensive monitoring and configuration of central office equipment, and monitoring functions such as optical path receiving and sending two-way interruption alarms.
This networking structure actually forms a loop artificially with the switch at both A and B. However, since the switch supports the spanning tree function, when a loop occurs, one route will be automatically selected as the working route, and the other route will be used as the working route. Disconnect as a backup. When the working line cannot work normally due to a fiber break on the line, the backup line will be automatically activated and become the working line. The networking in the actual project is more complicated than this. There are more than 20 branch offices in the city, all adopting this model. Fortunately, we and our colleagues in the engineering department worked together to complete the project.
3. Gigabit fiber optic transceivers and switches with integrated fiber optic interfaces
Using fiber optic transceivers for networking, besides stability, what else is there? That is speed! 100M full-duplex, even higher speed than 100 full-duplex: 1000M full-duplex. For example, one of our local construction machinery manufacturing companies originally rented the 100M line we provided for networking, but due to the needs of business development (the need to transmit large-capacity mechanical drawing pictures), we need to provide higher-speed networking lines, Fortunately, the advancement of technology has also provided us with corresponding products, namely, gigabit fiber optic transceivers.
