With the progress of technology, single-mode fiber optic began to enter the long-distance networking operations (from a few kilometers to more than a hundred kilometers), and the momentum of development is very rapid, in a few years' time, from the high-end applications into the common people, from the Xiangzi engaged in the project, now some key customers home to open the network are directly using the fiber optic transceiver (the so-called FTTH mode, fiber to the home), the use of fiber optic Transceiver networking has become a very common form of value-added services for broadcasters. The various models of fiber optic transceivers introduced below are all based on single-mode fiber.
(A) dual-fiber single-port
The so-called dual-fiber single-port fiber optic transceiver, is the use of two optical fibers (a transceiver), a set of fiber optic transceivers to achieve the conversion of electrical signals to optical signals, optical signals and then to electrical signals::
Remember that it should be about 2000, when this equipment is still a high-end equipment, a pair of fiber optic transceivers to several thousand dollars, but to achieve long-distance transmission is amazing, and compared to cable transmission (MODEM dial-up, DDN) has strong anti-interference ability, good signal quality characteristics, so in the opening of the service is particularly welcome by users, at the time to hear the user for fiber optic networking affirmation, we as engineering and technical personnel is also beautiful in the heart.
Here the network equipment may be the switch, may also be the server, so the fiber optic transceiver output of the network cable, whether it is a straight-through line or crossover line it, this issue can be considered a big problem at the time, Xiangzi every time to look through the manual, check the manual inside the model specific for the server or switch is a straight-through line or crossover line, but then with the accumulation of experience in networking, found a A law, that is, you can look at the fiber optic transceiver as a PC, PC and the switch is connected to the straight-through line, PC and the server is connected to the cross line, then the fiber optic transceiver and the switch is connected to the straight-through line, and the server is connected to the cross line. Of course, now with the technological progress, the fiber optic transceiver network port is generally made into adaptive mode (automatic matching of crossover and straight-through lines), and the project is correspondingly much more convenient to use.
(B) single fiber single network port
With the continuous development of business, we are faced with an inevitable problem, that is, fiber optic resources, some units to network, but there is only one available optical core on the line, this time how to do, well with the progress of technology, manufacturers have developed a new product, that is, single-fiber fiber transceiver, that is, in a core (an optical fiber will contain a number of optical cores, the number from the nth power of 2 increments ) to achieve two-way operation of receiving and transmitting, these products use the technology of wavelength division multiplexing, the use of wavelengths mostly 1310nm and 1550nm, that is, one end with 1310nm wavelengths of light on behalf of sending, with 1550nm wavelengths of light on behalf of receiving, the other end with 1310nm?wavelengths of light on behalf of receiving, with 1550nm wavelengths of light on behalf of sending.
Generally speaking, if the fiber optic transceiver is placed in the server room, we are inclined to choose this kind of fiber optic transceiver, for one thing, the quality of this structure is more stable, and for another, this modular structure can realize the centralized placement of fiber optic transceiver by placing the frame in the server room, for example, a 16-slot frame can place 16 fiber optic transceivers at a time.
This centralized device provides conditions for us to use fiber optic transceivers for large-scale networking, in fact, we are using this frame type fiber optic transceivers for local education, public security, banking and other units networking in the central server room.
(C) single-fiber dual network port
With the development of business, some units have higher requirements for using fiber optic transceivers for networking, such as the networking we provide for a local bank, the bank requires us to provide two strictly isolated Ethernet lines. The fiber optic transceiver equipment used should be technically mature, secure, simplify the network structure, save equipment investment, and achieve access to two business networks with strict isolation security requirements through one fiber, saving fiber optic resources to the maximum extent. The Ethernet electrical port of the device is a 10/100M adaptive port, and the optical path can realize the access capability of the Ethernet link up to 60 km, and support the local network management function. Under the network management platform, comprehensive monitoring and configuration of the equipment at the local end can be realized, as well as monitoring functions such as optical circuit receiving and transmitting bi-directional interruption alarms.
This network structure at A and B are actually artificially composed of a loop with the switch, but because the switch supports spanning tree function, when the loop appears, it will automatically select one way as a working line, and the other way disconnected as a backup, when the working line can not work properly due to the broken fiber on the line, the backup line will be automatically enabled and become a working line. The actual project in the network is more complicated than this, there are more than twenty branch offices in the city, are using this model, good thing we and the engineering department colleagues work together to complete this project.
