There are currently many models of SFP+ optical modules on the market, such as SFP-10G-SR optical modules for multi-mode transmission, SFP-10G-LR optical modules for single-mode transmission, and SFP-10G-LR optical modules that can be used for both single-mode transmission and SFP-10G-LRM optical module for multi-mode transmission. So what is the difference between SFP-10G-LRM optical module and SFP-10G-SR optical module? And what is the difference between SFP-10G-LRM optical module and SFP-10G-LR optical module? In this article, I will introduce the differences between them and help you choose the best SFP module to improve your network transmission performance.

Main Differences Between SFP-10G-LRM, SFP-10G-SR and SFP-10G-LR optical modules

The following table lists the main differences between SFP-10G-LRM, SFP-10G-SR and SFP-10G-LR optical modules:

Note: The SFP-10G-LRM2 optical module is an upgraded version of the SFP-10G-LRM optical module.

How to Choose SFP Module When Deploying the Network?

As can be seen from the table above, these three types of 10G SFP+ optical modules have many similarities, but at the same time there are differences in wavelength, fiber type and transmission distance. So, how to choose when deploying the network? When there are more than two optical modules that can meet the needs, will it make a big difference to choose one of them? The following will compare the SFP-10G-LRM optical module and the SFP-10G-SR optical module, as well as with the SFP-10G-LRM optical module and the SFP-10G-LR optical module.

Comparison Between SFP-10G-LRM and SFP-10G-SR

Both SFP-10G-SR optical module and SFP-10G-LRM optical module support multi-mode transmission. Among them, when the SFP-10G-SR optical module is used with OM3 optical fiber jumper, the maximum transmission distance is 300 meters; when used with OM4 optical fiber jumper, the transmission distance can reach 400 meters. When the SFP-10G-LRM optical module is used with OM3 and OM4 fiber optic patch cords, the maximum transmission distance is 200 meters. So how to choose between the two?

Generally, when the transmission distance is less than 300 meters, it is recommended to choose the SFP-10G-SR optical module. However, if there are other special requirements for transmission, such as a transmission distance of 200 meters when the modal bandwidth is 500 MHz·km, it is recommended to choose SFP-10G-LRM. optical module.

Additionally, is SFP-10G-SR compatible with 1GB? The SFP-10G-SR optical module is not typically backward compatible with 1GB speeds, so it is essential to consider the specific needs of your network infrastructure.

Detailed Comparison

A more detailed comparison of the two models is as follows:

Since many users are still using OM1 and OM2 optical fiber jumpers, the SFP-10G-SR optical module can only transmit 33 meters when used with OM1/OM2 optical fiber jumpers. The SFP-10G-LRM optical module is used with OM1/OM2 optical fiber. When the jumper is used, it can transmit up to 220 meters, so the SFP-10G-LRM optical module has a wider application range than the SFP-10G-SR optical module.

It should be noted that in order to ensure that the SFP-10G-LRM optical module passes the FDDI (Fiber Distributed Data Interface) level, the OM1 and OM2 optical fibers meet the specifications, and the transmitter (converts the output signal of the sensor into a signal that can be recognized by the controller, or a converter that converts the non-electricity input from the sensor into an electrical signal and amplifies it for remote measurement and control.) should be coupled through a mode conversion jumper (i.e., a multi-mode conversion fiber jumper), for OM3 or OM4 optical fiber.

The application of jumpers does not require mode adjustment jumpers. It is recommended to measure the optical power before inserting the optical fiber into the optical module. When the received optical power is greater than 0.5dBm, a 5dB optical fiber attenuator should be inserted at the transmitting end of the optical module on both sides of the link.

Additionally, how many watts fiber optic modem use a day can impact the overall energy consumption, so it is essential to factor in power usage when planning your network.

Comparison Between SFP-10G-LRM and SFP-10G-LR

The SFP-10G-LR optical module is suitable for long-distance communications up to 10 kilometers, such as interconnecting each building in a large campus and the creation of a metropolitan area network (MAN).

In addition to the multi-mode transmission mentioned above, the SFP-10G-LRM optical module can also support single-mode transmission. Single-mode will not suffer from light saturation. The transmission distance of the SFP-10G-LRM optical module can reach 300 meters.

Therefore, for transmission within 300 meters, choosing the SFP-10G-LRM optical module is a more economical and effective solution; for transmission between 300 meters and 2 kilometers, the SFP-10G-LRM2 optical module It is more suitable than SFP-10G-LR optical module because the price of SFP-10G-LRM2 optical module is lower within the same transmission range; for transmission of 2~10 kilometers, SFP-10G-LR optical module is The only option.

Note: The maximum transmission distance of the SFP-10G-LRM2 optical module on single-mode fiber is 2 kilometers, which is suitable for short-distance LAN connections.

(Read “Cisco 10GBASE SFP+ Modules Data Sheet” for additional information.)

Conclusion

Generally, for short-distance 10G transmission within 300 meters, it is more appropriate to choose the SFP-10G-SR optical module; but if you require optical signals to be transmitted on multi-mode optical fiber, you need to choose the SFP-10G-LRM optical module. 

At the same time, if the transmission distance is between 300 meters and 2 kilometers, it is more appropriate to choose the SFP-10G-LRM2 optical module; but if the transmission distance is between 2 kilometers and 10 kilometers, you can only choose SFP- 10G-LR optical module.

If you want to invest in SFP modules, Hi-Network.com is a good choice. It is s professional supplier known for providing high quality and cost-effective SFP modules and is trustworthy. Besides, we not only provide SFP modules, but also meet the needs of various network equipment and accessories to ensure that your network system can reach its best status. When you choose Hi-Network.com, you choose a reliable partner to protect your network construction.

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