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How to choose fiber optic transceivers?

2022-08-26
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Optical transceivers are generally used in practical network environments where Ethernet cables cannot cover and optical fibers must be used to extend transmission distances, and they also play a huge role in helping to connect the last mile of optical fiber to the metropolitan area network and beyond. effect. The following is an introduction to how to choose a fiber optic transceiver, and what is the specific method? I hope the explanation will be helpful to friends who are going to buy fiber optic transceivers!

 

How to choose fiber optic transceivers?

Since the optical fiber transceiver is one of the regional network connector devices, it must consider the compatibility with the surrounding environment, as well as the stability and reliability of its own products. On the contrary, no matter how low the price is, it cannot be favored by customers!

 

1. Does it support full duplex and half duplex?

Some chips on the market can only use full-duplex environment and cannot support half-duplex. For example, if it is connected to a switch (SWITCH) or hub (HUB) of other brands, and it uses half-duplex mode, it will definitely cause serious conflicts. and packet loss.

 

2. Has the connection test been done with other fiber optic transceivers?

There are more and more fiber optic transceivers on the market. If the compatibility of different brands of transceivers has not been tested beforehand, there will be packet loss, long transmission time, and sometimes fast and slow.

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3. Is there a safety device to prevent packet loss?

When manufacturing fiber optic transceivers, some manufacturers often use the register data transmission mode in order to reduce costs. The biggest disadvantage of this method is instability and packet loss during transmission, and the best is to use buffer circuit design. Data packet loss can be safely avoided.

 

4. Temperature adaptability?

When the fiber optic transceiver itself is used, it will generate high heat. When the temperature is too high (not greater than 85°C), is the fiber optic transceiver working normally? It is a factor worthy of consideration by customers!

 

5. Does it comply with the IEEE802.3u standard?

If the fiber optic transceiver conforms to the IEEE802.3 standard, that is, the delay time is controlled at 46bit, if it exceeds 46bit, it means that the distance transmitted by the fiber optic transceiver will be shortened!

 

Optical fiber transceivers are generally used in actual network environments that cannot be covered by Ethernet cables and must use optical fibers to extend the transmission distance, and are usually located in the access layer applications of broadband metropolitan area networks; The metropolitan area network and the outer network also played a huge role. Next, this article will introduce to you what are the main classifications of optical fiber transceivers? If you want to know more, let's take a look with this editor!

 

Classification by fiber properties

Single-mode fiber optic transceiver: transmission distance from 20 kilometers to 120 kilometers

Multimode fiber optic transceiver: transmission distance from 2km to 5km

For example, the transmit power of a 5km fiber optic transceiver is generally between -20 and -14db, the receiving sensitivity is -30db, and the wavelength of 1310nm is used; while the transmit power of a 120km fiber optic transceiver is mostly between -5 and 0dB, and the receiving sensitivity is between -5 and 0dB. is -38dB, using a wavelength of 1550nm.

 

Sort by fiber required

Single Fiber Optical Transceiver: Receive and transmit data on one fiber

 

Dual Fiber Optical Transceivers: Receive and transmit data on a pair of fibers

 

Sort by work level/rate

100M Ethernet Optical Transceiver: Working at the Physical Layer

 

1000M Ethernet Optical Transceiver: Working at the Physical Layer

 

10/100M/1000M Adaptive Ethernet Optical Transceiver: Working at the Data Link Layer

 

According to the working level/rate, it can be divided into single 10M, 100M fiber optic transceivers, 10/100M adaptive fiber optic transceivers and 1000M fiber optic transceivers. The single 10M and 100M transceiver products work at the physical layer, and the transceiver products that work at this layer forward data in bits. This forwarding method has the advantages of fast forwarding speed, high permeability and low delay, and is suitable for use on links with fixed rates. Better performance and stability.

 

by structure

Desktop (stand-alone) fiber optic transceivers: stand-alone customer premises equipment

 

Rack-mounted (modular) optical transceiver: installed in a 16-slot chassis, using centralized power supply

 

According to the structure, it can be divided into desktop (stand-alone) fiber optic transceivers and rack-mounted fiber optic transceivers. The desktop fiber optic transceiver is suitable for a single user, such as the uplink of a single switch in the corridor. Rack-type (modular) fiber optic transceivers are suitable for multi-user aggregation. Most domestic racks are 16-slot products, that is, a maximum of 16 modular fiber-optic transceivers can be inserted in one rack.

 

By management type

Unmanaged Ethernet fiber optic transceiver: plug and play, set the working mode of the electrical port through the hardware DIP switch

 

Managed Ethernet Optical Transceiver: Supports carrier-class network management

 

 

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