{"id":19989,"date":"2026-08-06T06:22:29","date_gmt":"2026-08-06T06:22:29","guid":{"rendered":"https:\/\/www.fibermall.com\/blog\/?p=19989"},"modified":"2026-08-06T06:24:38","modified_gmt":"2026-08-06T06:24:38","slug":"what-is-sfp28-25g-transceiver-explained","status":"publish","type":"post","link":"https:\/\/www.fibermall.com\/blog\/what-is-sfp28.htm","title":{"rendered":"What Is SFP28? 25G Transceiver Explained"},"content":{"rendered":"\n

Two modules sit on the bench, identical down to the pull tab and the duplex LC connector. One moves 10 Gbps. The other moves 25 Gbps. You can’t tell them apart by looking.<\/p>\n\n\n\n

SFP28 is a hot-pluggable optical transceiver that delivers 25 Gigabit Ethernet over a single electrical lane. It shares the small form factor of SFP and SFP+ but runs about 2.5 times faster, and it follows the IEEE 802.3by standard for 25GBASE-R links.<\/p>\n\n\n\n

If you’ve already sorted out SFP vs SFP+ and someone hands you “SFP28,” the natural reaction is: another acronym, another spec sheet. Fair enough. But SFP28 deserves a closer look, because it’s quietly become the default server access module in modern data centers. It’s also the building block that 100G QSFP28 is made of.<\/p>\n\n\n\n

By the end of this guide, you’ll know exactly what SFP28 is, what the “28” actually refers to, and where it sits in the SFP family. We’ll cover the key specifications, how the module works in plain language, and the questions engineers ask most when they’re planning 25G links.<\/p>\n\n\n\n

Let’s start with the name, since it’s the source of most of the confusion.<\/p>\n\n\n\n

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