What is fiber media converter?

- Mar 14, 2017-

Fiber Optic Transceivers, is a short distance twisted pair electrical signals and long distance optical signal interchangeable Ethernet transmission media conversion unit, in many places also known as the photoelectric converter (Fiber Media Converter). 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 broadband layer network access layer applications; such as: monitoring security engineering high-definition video image transmission; Helping to connect the last mile of fiber to the metro network and the outer network also played a huge role.


Fiber media converter are generally used in the actual network environment where Ethernet cables can not be overwritten and must be used to extend the transmission distance, while also helping to connect the fiber's last mile line to the metro and the outer network The role. With fiber media converter, but also for the need to upgrade the system from copper to fiber, for the lack of funds, manpower or time to provide users with a cheap program. The role of fiber media converter, we want to send the electrical signal into optical signals, and sent out at the same time, can receive the optical signal into electrical signals, input to our receiver.


Foreign and domestic production of fiber optic transceivers a lot of manufacturers, product lines are also very rich. In order to ensure complete compatibility with other manufacturers of network cards, repeaters, hubs and switches and other network equipment, fiber optic transceivers products must be strictly in line with 10Base-T, 100Base-TX, 100Base-FX, IEEE802.3 and IEEE802.3u and other Ethernet Network standards, in addition, EMC anti-electromagnetic radiation should be consistent with FCC Part15. Nowadays, as the major domestic carriers are building the community network, the campus network and the enterprise network, the dosage of the fiber optic transceivers is also increasing to meet the construction needs of the access network.

Nature classification

Single-mode fiber media converter: transmission distance of 20 km to 120 km

Multi-mode fiber media converter: transmission distance of 2 km to 5 km

Such as 5 km fiber media converter transmit power is generally between -20 ~ -14db, the receiving sensitivity of-30db, the use of 1310nm wavelength; and 120 km fiber media converter transmit power between -5 ~ 0dB, the receiving sensitivity For -38dB, using a wavelength of 1550nm.

Required classification

Single fiber media converter: receive the data sent on an optical fiber transmission

Dual fiber media converter: receive the data sent on a pair of fiber transmission

As the name suggests, single-fiber equipment can save half of the fiber, that is, in a fiber to achieve data reception and transmission, where the fiber is very tight. This type of product uses wavelength division multiplexing technology, the use of wavelengths are mostly 1310nm and 1550nm. However, due to single-fiber transceiver products do not have a unified 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 fiber media converter: work in the physical layer

10/100M adaptive Ethernet fiber media converter: work in the data link layer

According to the work level / rate, can be divided into single 10M, 100M fiber optic transceivers, 10 / 100M adaptive fiber optic transceivers and 1000M fiber optic transceivers 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) fiber media converter: Standalone Client Devices

Rackmount (modular) fiber media converter: installed in the fourteen or sixteen slot chassis, using centralized power supply

According to the structure to points, can be divided into desktop (stand-alone) fiber optic transceivers and rack-mounted fiber optic transceivers. The desktop fiber optic transceivers are suitable for use by a single user, such as the uplink of a single switch in a corridor. Rackmount (modular) fiber optic transceivers for multi-user convergence, the current domestic rack for the 16-slot products, that is, a rack can be inserted up to 16 modular fiber media converter.

Management type classification

Unmanaged Ethernet Media Converter: Plug and Play, set the electrical work mode via hardware DIP switch

Managed Ethernet Media Converter: Supports carrier-class network management

Power classification

Built-in power supply media converter: built-in switching power supply for the carrier-class power supply; External power supply media converter: external transformer power supply used in civilian equipment.

Work style classification

Full duplex means that when the data is transmitted and received by the two different transmission lines, the two sides of the communication can be sent and received at the same time operation, 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 two sides can not send and receive data at the same time, this transmission is half-duplex system. 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. Therefore, a time delay occurs.


Referred to fiber media converter, the main talk about the advantages of fiber media converter relative to the optical switch.

First of all, fiber media converter plus ordinary switches in the price is far cheaper than the optical switch, in particular, some optical switch in the plug-in module will lose after the loss of a few or even a few electrical, so that operators can make a large extent Reduce pre-investment.

Second, most of the optical modules of the switch are not uniform standards, so once the optical module on the need to repair the same module from the original manufacturers, so that the late maintenance to bring a lot of trouble. But the fiber optic transceivers between the different manufacturers of equipment in the interconnection has been no problem, so once damaged can also use other manufacturers to replace the product, maintenance is very easy.

In addition, fiber media converter than the optical switch in the transmission distance on the product more complete. Of course, optical switch in many ways also has advantages, such as unified management, unified power supply, etc., here is no longer discussed.

Previous:How does Ethernet HUB work? Next:What is ethernet switch?