XFP Transceiver Detailed Classification - Comparison of advantages and disadvantages

The XFP transceiver is an Ethernet transmission media conversion unit that switches short-range twisted-pair electrical signals and long-distance optical signals, and is known in many places as photoelectric converters. The product is generally used in the actual network environment where the Ethernet cable can not be covered and must be used to extend the transmission distance, and is usually located in the access layer application of the optical fiber broadband metro network; while helping to connect the last mile of the fiber to the city The network and the outer network also played a huge role.

Foreign and domestic production XFP transceiver manufacturers a lot, the product line is also very rich. XFP Transceiver products must be in strict compliance with 10Base-T, 100Base-TX, 100Base-FX, IEEE802.3 and IEEE802.3u Ethernet, in order to ensure complete compatibility with network equipment such as network cards, repeaters, hubs and switches, Network standard, in addition, EMC anti-electromagnetic radiation should be consistent with FCC Part15. Nowadays, as the major domestic carriers are building the community network, campus network and enterprise network, the amount of XFP transceiver products is also increasing to meet the needs of the access network.

Nature classification
Single-mode XFP transceiver: transmission distance of 20 km to 120 km
Multi-mode XFP transceiver: transmission distance of 2 km to 5 km
Such as 5 km XFP transceiver transmit power is generally between -20 ~ -14db, the receiving sensitivity of-30db, the use of 1310nm wavelength; and 120 km XFP transceiver transmit power between -5 ~ 0dB, the receiving sensitivity For -38dB, using a wavelength of 1550nm.
Required classification
Single-fiber XFP Transceiver: Receives the transmitted data on an optical fiber
Dual Fiber XFP Transceiver: Receives the transmitted data on a pair of fibers
 XFP Transceiver Detailed Classification - Comparison of advantages and disadvantages
As the name suggests, single-fiber equipment can save half
Fiber, that is, in a fiber to achieve the data to receive and send, in the fiber resources is very tight place. This type of product uses wavelength division multiplexing technology, the use of wavelengths are mostly 1310nm and 1550nm. However, because the single-fiber transceiver products do not have uniform international standards, so different manufacturers of products in the interconnection may be incompatible situation. In addition, due to the use of wavelength division multiplexing, single fiber transceiver products, the prevalence of large signal loss characteristics.

Working level / rate
100M Ethernet XFP Transceiver: Works at the physical layer
10 / 100M Adaptive Ethernet XFP Transceiver: Works at the data link layer
According to the work level / rate, can be divided into single 10M, 100M XFP transceiver, 10 / 100M adaptive XFP transceiver and 1000MXFP transceiver and 10/100/1000 adaptive transceiver. Which single 10M and 100M transceiver products work in the physical layer, in this layer of the transceiver product is bit by bit to forward data. The forwarding method has the advantages of fast forwarding speed, high transmittance and low delay. It is suitable for the fixed-rate link, and because such equipment does not have a self-negotiation process before normal communication, Sex and stability.

Structural classification
Desktop (standalone) XFP Transceiver: Standalone client device
Rackmount (modular) XFP transceiver: installed in the sixteen slot chassis, using centralized power supply
By structure, can be divided into desktop (stand-alone) XFP transceiver and rack-mount XFP transceiver. The desktop XFP transceiver is suitable for use by a single user, such as the uplink of a single switch in the corridor. Rackmount (modular) XFP transceiver for multi-user convergence, the current domestic rack for the 16-slot products, that is, a rack can be inserted up to 16 modular XFP transceiver.

Management type classification
Unmanaged Ethernet XFP Transceiver: Plug and Play, set the electrical operating mode via hardware DIP switch
Managed Ethernet XFP Transceiver: Supports carrier-class network management

Network management
Can be divided into non-network management XFP transceiver and managed XFP transceiver. Most operators want their network in all the equipment can be done to the extent of remote network management, XFP transceiver products and switches, routers, but also gradually to this direction. For the network management of the XFP transceiver can also be subdivided into the central office network management and network management. Central office network management XFP transceiver is mainly rack-mounted products, most of the use of master-slave management structure, the main network management module on the one hand need to poll their own network management information on the rack, on the other hand need to collect all from the sub-frame On the information, and then submitted and submitted to the network management server. Such as the Wuhan FiberHome Network provided by the OL200 series managed XFP transceiver products support 1 (main) +9 (from) the network management structure, a one-time management of up to 150 XFP transceiver.

The client network management can be divided into three main ways: the first is to run a specific protocol between the central office and the client device. The protocol is responsible for sending the client's state information to the central office. The CPU of the central office device handles these states Information and submitted to the network management server; the second is the central office of the XFP transceiver can detect the optical power on the optical port, so when the optical path problems can be judged according to optical power is a fiber problem or the client equipment failure ; The third is in the client side of the XFP transceiver installed on the main control CPU, so that the network management system on the one hand can monitor the working state of the client device, in addition to remote configuration and remote restart. In the three kinds of client-side network management, the first two are strictly speaking only on the client device for remote monitoring, and the third is the real remote network management. But because the third way in the user side to add the CPU, which also increased the cost of the client equipment, so the price of the first two ways will be more advantages. As operators demand more and more of the equipment network management, it is believed that the XFP transceiver network management will become more practical and intelligent.

Power classification
Built-in power supply XFP transceiver: built-in switching power supply for the carrier-class power supply; external power XFP transceiver: external transformer power supply used in civilian equipment.

Work style classification
Full duplex means that when the data is sent and received by the two different transmission lines, the two sides can communicate at the same time to send and receive operations, this transmission is full duplex system ,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 the data can be controlled simultaneously in both directions. The full-duplex mode does not require direction switching, so there is no time delay for switching operations.
Half duplex means that the same transmission line is used for both receiving and sending, although the data can be transmitted in both directions, but the communication can not send and receive data at the same time. This mode of transmission is half-duplex. In the case of half-duplex mode, the transmitter and receiver at each end of the communication system are switched to the communication line through the transceiver switch, and the direction is switched. As a result, a time delay occurs.

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