Is the SFP28 optical module backward compatible

SFP28 (Small Form-Factor Pluggable 28) is an enhanced version of SFP+, designed to support 25Gb/s data rate transmission while maintaining the same package type. SFP28 is backward compatible with SFP+. However, compatibility can vary based on the specific SFP models, networking equipment, and vendors involved. It's advisable to consult your vendor for precise information regarding compatibility. ①. This article helps network engineers and field techs confirm SFP backward compatibility when mixing SFP, SFP+, and SFP28 optics in the same switching ecosystem. You will get concrete specs, a decision checklist, and troubleshooting patterns that show up in daily operations. ① Plug a 1000BASE-SX SFP transceiver into the SFP port on a gigabit. Common form factors are SFP (1 G), SFP+ (10 G), SFP28 (25 G), QSFP+ (40 G) and QSFP28 (100 G). The question we answer below is simple: “Which of these can I mix and match without killing the link? What “compatibility” really means? All reputable transceivers follow the Multi-Source Agreement (MSA). SFP28 optical transceiver modules provide a transmission rate of 25 Gbps and use LC connectors. 25G SR/eSR are not supported for use. Q: Can I use an SFP transceiver in SFP28 ports? A: Yes, you can. However, it's important to note that while SFP transceivers and cables can be plugged into SFP28 ports, they won't support the higher 25Gb/s data rate of the SFP28. [PDF]