Fiber Transceiver Classification part 2

Update:06 Aug 2018
Summary:

Structural classification Desktop (stand-alone) fiber o […]

Structural classification

Desktop (stand-alone) fiber optic transceiver: stand-alone client device
Rackmount (Modular) Fiber Transceiver: Mounted in a 16-slot chassis with centralized power supply
According to the structure, it can be divided into desktop (stand-alone) fiber transceivers and rack-mount fiber transceivers. The desktop fiber optic transceiver is suitable for single users, such as meeting the uplink of a single switch in the corridor. Rack-mount (modular) fiber optic transceivers are suitable for multi-user aggregation. Currently, domestic racks are mostly 16-slot products, that is, up to 16 modular fiber transceivers can be inserted into one rack.
Management type classification
Unmanaged Ethernet fiber transceiver: plug and play, set the electrical port working mode through the hardware DIP switch
Managed Ethernet Optical Transceiver: Supports Carrier-Grade Network Management
Network management
Can be divided into non-managed optical transceivers and managed optical transceivers. Most operators hope that all devices in their network can achieve remote network management. Fiber transceiver products are gradually moving in this direction as switches and routers. For the network management of the optical transceiver, it can be subdivided into the central office network management system and the user end network management system. The optical transceivers of the central office network management are mainly rack-mounted products. Most of them adopt the master-slave management structure. The main network management module needs to poll the network management information on its own rack on the one hand, and collect all the secondary subracks on the other hand. The information on it is then summarized and submitted to the network management server. For example, the OL200 series managed optical transceiver products provided by Wuhan Fenghuo Network support 1 (main) + 9 (slave) network management structure, and can manage up to 150 optical transceivers at one time.
The NMS can be divided into three types. The first one is to run a specific protocol between the central office and the client device. The protocol is responsible for sending the status information of the client to the central office and processing the status through the CPU of the central office device. The information is submitted to the network management server. The second type is that the optical transceiver on the optical end can detect the optical power on the optical port. Therefore, when there is a problem on the optical path, it can be judged whether the optical fiber is faulty or the fault of the user equipment. The third is to install the main control CPU on the fiber transceiver of the user end, so that the network management system can monitor the working state of the user equipment on the one hand, and can also implement remote configuration and remote restart. Among the three types of client network management methods, the first two are strictly remote monitoring of the client device, and the third is the real remote network management. However, since the third method adds a CPU to the user side, which also increases the cost of the client device, the first two methods are more advantageous in terms of price. As operators demand more and more equipment network management, it is believed that the network management of optical transceivers will become more practical and intelligent.
Power classification
Built-in power fiber transceiver: built-in switching power supply for carrier-grade power supply; external power supply fiber transceiver: external transformer power supply is used in civilian equipment.
Working style classification
Full duplex means that when data is transmitted and received and shunted by two different transmission lines, both sides of the communication can transmit and receive at the same time. This transmission mode is full-duplex. ,As shown in Figure 1. In the full-duplex mode, the transmitter and the receiver are provided at each end of the communication system, so that data can be controlled to be transmitted in both directions simultaneously. The full-duplex mode eliminates the need to switch direction, so there is no time delay caused by the switching operation.
Half duplex refers to the use of the same transmission line for both reception and transmission. Although the data can be transmitted in both directions, the communication cannot simultaneously transmit and receive data. This transmission method is half-duplex. In the half-duplex mode, the transmitter and receiver at each end of the communication system are switched to the communication line through the receive/transmit switch, and the direction is switched. Therefore, a time delay occurs.

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