25G-SFP28-100 Dual-Rate 10G/25G SFP28 SR Transceiver: 25G-SFP28-100

The EdgeOptic 25G-SFP28-100 is a 25GBASE-SR SFP28 transceiver for 25 Gigabit Ethernet over multimode fiber, with multi-rate operation that carries data from 8.5 to 25.78 Gbps. The optical engine pairs an 850 nm VCSEL transmitter with a PIN photodiode receiver, conforms to IEEE 802.3by Clause 112 and the SFP28 MSA, and terminates in duplex LC/UPC. TX power is specified from −5 to +2.4 dBm, RX sensitivity is better than −10.3 dBm, and the optical link budget is 5.3 dB with host-side RS-FEC enabled.

Reach depends on fiber grade. Per IEEE 802.3by Clause 112, the module operates to 70 m over OM3 and 100 m over OM4. OM5 wideband multimode is generally cited as backward compatible with OM4 at 850 nm; verify the installed fiber grade against TIA-492AAAE certification before assuming the same 100 m envelope on mixed plants. Distance figures derive from the minimum optical budget and standard cable attenuation, so usable reach in a real deployment depends on connector count, splice loss, and end-face cleanliness.

IEEE 802.3by Clause 112 references RS-FEC, defined as RS(528,514) in Clause 91, for 25GBASE-SR optical links at full reach. Switch vendors commonly enable RS-FEC on 25G SR ports, though support is not universal; some platforms default to FC-FEC or run without FEC, and specific Cisco Nexus 9300 chassis variants (the C93180YC-EX is one documented example) do not support RS-FEC. Verify the FEC capability of your specific chassis model against the vendor transceiver compatibility documentation before commissioning. FEC runs in the host ASIC rather than the transceiver, so both ends of a 25G link must be configured for the same FEC mode. A mismatch between RS-FEC and FC-FEC, or between FEC-on and FEC-off, is the most common reason 25G links fail to come up with no obvious error message; confirm the FEC configuration on both switches during commissioning.

Power consumption is 0.3 W maximum from a +3.3 V single rail, useful headroom in dense top-of-rack and leaf-spine designs where 48 or 96 ports run concurrently at line rate. The electrical interface follows SFF-8431 and SFF-8432, and DOM telemetry is exposed through the SFF-8472 interface, with real-time readouts for TX power, RX power, module temperature, laser bias current, and supply voltage. Commercial operating temperature is 0 to 70 °C and the module is Class 1 FDA and IEC 60825-1 laser safety compliant, CE marked, and RoHS conformant.

Typical deployments include data center leaf-spine fabrics, 25G access for NVMe-oF and SAN buildouts, QSFP28 breakout pairs that deliver 4x25G from a single 100G port, and 5G fronthaul transport for CPRI and eCPRI over 25G. The multi-rate range also lets the module run at 10G Ethernet on hosts that negotiate down, useful during mixed-generation refresh cycles. The 25G-SFP28-100 is available for 80+ vendor platforms; see individual compatible product pages for vendor-specific coding, or contact our sales team for platform-specific variants. Ships next business day from EU stock with a lifetime warranty. Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms.