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If you discuss the commonly used 10G SFP+ modules in fiber optic communications, you’ll encounter names like SFP-10G-SR, SFP-10G-LRM, and SFP-10G-LR. These transceivers, widely manufactured by major companies such as Cisco, Juniper, Arista, and FS, primarily serve switches and routers all sfp module types .
An SFP module is a compact, hot-swappable device. The designation “10G” indicates its maximum transmission capacity of 10.3 Gbps, making it compatible with 10 Gigabit Ethernet. The acronyms SR, LRM, and LR specify the transmission range of the 10G optical module, covering short to long distances.
This blog post will focus on the differences between SFP-10G-SR, SFP-10G-LRM, and SFP-10G-LR. Additionally, we will discuss how to choose the right one for your needs.
The 10GBASE-SR SFP+ module, also known as the SFP-10G-SR, utilizes VCSEL technology and can transmit data up to 300 meters when used with OM3 Multimode Fiber (MMF). Furthermore, these modules are cost-effective and consume low power.
In contrast, the SFP-10G-LR module is a 10GBASE-LR SFP+ module that employs Distributed Feedback Laser (DFB) technology. It operates at a nominal wavelength of 1310nm and can transmit data over single-mode fiber (SMF) up to 10 km. Typically, these modules connect buildings on large campuses or establish a Metro Area Network (MAN).
Meanwhile, the SFP-10G-LRM module, a 10GBASE-LRM module, accommodates link distances of up to 220m using standard Fiber Distributed Data Interface (FDDI) grade multimode fiber. To meet FDDI-grade specifications for OM1 and OM2 fibers, you need to couple the transmitter through a mode conditioning patch cord. However, for applications using OM3 or OM4, no mode conditioning patch cord is required.
Other differences based on different factors are:
Package type:
All three module types have different package types. For instance, the SFP-10G-SR and SFP-10G-LRM use an LC duplex interface. In contrast, the SFP-10G-LR operates with a single connector.
Transmission rate:
These three module types are suitable for 10-gigabit Ethernet because they have a maximum transmission rate of 10.3Gbps. No other modules have this high transmission rate.
Wavelength:
The wavelength of these module types varies. You cannot use them randomly expecting desired results. The shortest wavelength of 850nm is used by SFP-10G-SR. Next, the longer wavelength of 1310 nm is used by SFP-10G-LRM and the longest wavelength of 1310nm or 1550 is used by SFP-10G-LR. But, the thing is that the wavelength depends on the manufacturer.
Maximum distance:
The maximum distance of these module types varies depending on different parameters. The SFP-10G-SR transmits a maximum distance of up to 300 meters. The SFP-10G-LRM transmits a maximum distance of up to 220 meters. Lastly, the SFP-10G-LR transmits maximum distances up to 10 kilometers, 20 kilometers, and more. Even this depends on the manufacturer.
Interface:
Surprisingly, all the SFP module types support LC duplex interfaces. The only difference is that the SFP-10G-LRM comes with a unique capability that supports both single-mode and multi-mode fiber.
Laser type:
The SFP-10G-LRM and SFP-10G-LR use the same laser type, which is a Distribute Feedback (DFB) laser. On the other hand, SFP-10G-SR uses a Vertical-Cavity Surface-Emitting Laser (VCSEL). The laser type used by these modules makes a major difference.
Fiber optic type:
Like laser type, two SPF module types use the same fiber optic type. The two similar ones are SFP-10G-SR and SFP-10G-LRM. They use multi-mode fiber optic cables. Talking about SFP-10G-LR, they use single-mode fiber optic cables.
Transmitted light power:
The light power transmission rate is different for all three SFP modules. The power light transmitted by SFP-10G-SR is between -6 and -1 dBM, SFP-10G-LRM is between -6 and 0 dBm and SFP-10G-LR is between 0 and 4 dBm.
Received sensibility:
The received sensibility of SFP-10G-SR and SFP-10G-LRM is the same, which is -11.1 dbm. Regarding SFP-10G-LR, the received sensibility is high, which is -14.4 dBm.
Commercial temperature
SFP-10G-SR and SFP-10G-LRM operate at a commercial temperature ranging between 0 and 70 degrees Celsius. On the other hand, the SFP-10G-LR functions at the range of -40 to 85 degrees Celsius, which is a wider commercial temperature.
Application range:
The application range depends on the communication distance. For short-distance communication, SFP-10G-SR is used. For longer distances within a data center, SFP-10G-LRM is used. Lastly, for long-distance communication between data centers or across wide areas, SFP-10G-LR is used. This longest distance is seen in metropolitan and access networks.
What should you choose?
The choice depends on your network requirements. For a short transmission distance (up to 300 meters), you should choose the SFP-10G-SR, as this is an affordable option. However, if the transmission distance is longer (up to 200 meters), you should opt for the SFP-10G-LRM, although this distance is still relatively short. On the other hand, if the transmission distance is longer (up to 10 kilometers) and your budget permits, you should consider the SFP-10G-LR.
Furthermore, you should consider the fiber optic cable used with these module types, as it plays an important role. Specifically, the SFP-10G-LR supports single-mode fiber, while the SFP-10G-SR and SFP-10G-LRM support multimode fiber. Additionally, you should take into account the compatibility of the SFP module types with your network equipment. Keep in mind that not all equipment supports every type of SFP module. Ultimately, the objective is to ensure that your network runs smoothly without any interruptions.
To know more about SFP-10G-SR, SFP-10G-LRM, and SFP-10G-LR modules, please connect with us via WhatsApp at +971585811786
Author: TechBlonHub
As a passionate blogger, I'm thrilled to share my expertise, insights, and enthusiasm with you. I believe that technical knowledge should be shared, not hoarded. That's why I take the time to craft detailed, well-researched content that's easy to follow, even for non-tech. I love hearing from you, answering your questions, and learning from your experiences. Your feedback helps me create content that's tailored to your needs and interests
