2012年8月22日星期三

Fiber media converter classification


The fiber media converter products must strictly comply with 10Base-T, 100Base-TX, 100Base-FX, IEEE802.3 and IEEE802.3u and other Ethernet standards, In addition, EMC anti-electromagnetic radiation shall comply with FCC Part15.
With the development of fiber media converter, there are different Classification for fiber media converter.
Divided by the optical fiber can be divided into multi-mode fiber media converter and single mode fiber media converter.
The media convertercan transmit distance is not the same, due to the use of fiber, multimode transceiver transmission distance of 2 km to 5 km, while the single-mode media converter coverage from 20 km to 120 km. Should be noted that due to the different transmission distance, fiber media converter transmit power, receiver sensitivity and the use of wavelength will be different.
Such as the 5 km fiber-media converter transmit power is generally -20 ~-14db between the receiver sensitivity of-30db, use 1310nm wavelength; 120 km of fiber media converter transmit power and more between -5 ~ 0dB, the receiver sensitivity -38dB, the wavelength of 1550nm.

Divided by Working level / rate points can be divided into single-10M, 100M fiber media converter, 10/100M adaptive fiber media converter and 1000M fiber media converter.
Single 10M and 100M fiber media converter products at the physical layer, this layer media converterr products by bit to forward data. The forward mode with fast forwarding, transparent high latency advantages of low, suitable for the rate is fixed the link, while such devices without a consultation process before the normal communication, and therefore compatible and stability to do better.
10/100M fiber media converter to work in the data link layer, this layer of media converterto use a store-and-forward mechanism, so that forwarding mechanism received a packet should read the source MAC address, the purpose of MAC address and the data payload, and CRC Cyclic redundancy Check after the packet is forwarded out. Store and forward the benefits of a number of error frames can prevent spread in the network, taking up valuable network resources, but also can prevent packet loss due to network congestion caused by the data when the data link is saturated store-and-forward can be will not be able to the data transmitted first on the the transceiver cache, waiting for the network is idle and then forwarded. This will not only reduce the possibility of data conflict to ensure the reliability of data transmission, 10/100M fiber media converter is suitable for work on a fixed link rate.
1000M fiber media converter according to the actual need to work in the physical layer or data link layer, these two market 1000M fiber media converter.
Classification by type of management
Unmanaged Ethernet media converter: Plug and Play hardware DIP switch to set the electrical port mode
Managed Ethernet media converter: support carrier-grade network management
According to the number of fibers
Can be divided into single fiber and fiber media converter, and dual-fiber media converter. As the name implies, the single-fiber devices can save half of the fiber, to receive and send data in an optical fiber, the fiber tension is very applicable. These products using the WDM technology, the use of wavelength, multi-1310nm and 1550nm. With the growing number of single fiber optical transceiver use, the product is mature and stable.

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