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What Do You Know about 25G SFP28?

Sep. 26, 2022

The 5G era has quietly arrived, and related technologies have developed rapidly, followed by the rise of 25G equipment. Compared with the traditional 10G interface, 25G cutting-edge technology can provide more bandwidth. As an important carrier of 25G technology, 25G optical modules have derived a variety of models that can cover different distance transmission requirements.

25G SFP28 Optical Module FAQ

1. What is the maximum transmission distance of a 1.25G SFP28 optical module?

At present, the transmission distance of the SFP-25G-ER optical module is the largest, which is 40 kilometers in theory. It is not ruled out that there will be a 25G optical module with a longer transmission distance in the future. 

2. Can 25G SFP28 optical modules of different brands communicate with each other?

25G optical modules can communicate with each other as long as they meet industry standards.

3. Can SFP28 SFP28 optical modules be inserted into SFP+ ports?

If there are no special requirements for the port identification software settings, it is theoretically possible. The operating rate at this time is 10Gb/s instead of 25Gb/s. 

4. Can the SFP+ optical module be inserted into the SFP28 port for use?

In theory, it is possible, but the actual operating rate is 10G.

5. Can SFP28 ports be interconnected with QSFP28 ports?

The answer is yes. Configure the 100G QSFP28 port on the device to 4*25G mode (if supported), then insert the 100G module into the port, and connect the SFP28 optical module in the SFP28 port through a one-to-four cable.

 25G 100M SFP28 SR

25G 100M SFP28 SR

25G SFP28 optical module types and applications

1.25G SFP28 conventional optical module

According to the transmission distance, 25G SFP28 optical modules can be divided into SR optical modules, LR optical modules, and ER optical modules. 25G SFP28 SR optical modules are generally used with OM4 multi-mode patch cords for short-distance transmission, and the transmission distance is less than 100 meters; 25G SFP28 LR and 25G SFP28 ER optical modules are generally used with OS2 single-mode patch cords for long-distance transmission, SFP28 LR optical modules The module theoretically can transmit as far as 10 kilometers, while the SFP28 ER optical module can transmit as far as 40 kilometers. 25G SFP28 conventional optical modules are mainly used for the interconnection of data center servers, switches, and routers.

2.25G WDM SFP28 color optical module

25G WDM SFP28 color optical module includes 25G CWDM SFP28 optical module, 25G DWDM SFP28 optical module, 25G LWDM SFP28 optical module. 

The 25G CWDM SFP28 optical module is a single-mode duplex CWDM module with a working wavelength range of 1271~1331nm. It can be used for short-distance data transmission in 25G Ethernet switches, routers, network interface cards (NIC), and storage network equipment. It can solve the 5G millimeter-wave fronthaul problem well at the current stage. The 25G DWDM SFP28 optical module currently on the market can transmit up to 10km through a single-mode fiber. It can increase the bandwidth and realize long-distance transmission. 

Compared with the previous two 25G color optical modules, the 25G LWDM SFP28 optical module adopts high-performance and low-cost DML lasers and utilizes the LAN-WDM optical wavelength. It has become an ideal solution for 5G fronthaul and can meet a variety of fronthaul application scenarios. The product can realize passive wavelength division multiplexing and reduce fiber resource consumption. It can transmit 30km without forwarding error correction and 40km with forwarding error correction.

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