SPTSLP4SLCDF Intel Compatible QSFP28 Transceiver

SPTSLP4SLCDF is Intel's part number for a single-lambda 100G QSFP28 transceiver designed for Intel Ethernet 800 Series network adapters, including the E810-CQDA2 and E810-2CQDA2. EdgeOptic's compatible replacement is built on our 100G-QSFP28-SL10 platform, matching the original optical and electrical specifications. The module conforms to IEEE 802.3cu 100GBASE-LR and reaches 10 km over standard G.652 single-mode fiber with duplex LC/UPC connectors.

Unlike traditional 100GBASE-LR4 modules that multiplex four 25G NRZ lanes across LAN WDM wavelengths, the SPTSLP4SLCDF uses a single optical lane at 100G PAM4 modulation. The operating wavelength falls within 1304.5–1317.5 nm, transmitted through a single DFB laser and received by a PIN photodiode with linear equalization for PAM4 signal recovery. This single-lambda architecture reduces the internal component count compared to four-lane designs, lowering both power dissipation and per-port cost in dense server NIC deployments. Typical module power consumption sits around 3.5 W, compared to 4.0–4.5 W for a four-lane LR4 QSFP28.

Link budget parameters include a minimum launch power of -3.8 dBm, maximum launch power of +2.4 dBm, and receive sensitivity of -9.3 dBm at a pre-FEC BER of 2.4e-4. RS(544,514) KP4 FEC is mandatory on the host side; the E810 NIC handles this in hardware. Without KP4 FEC enabled, the link will not come up. The E810 firmware enables KP4 FEC automatically for 100GBASE-LR interfaces, so under normal driver configurations no manual FEC adjustment is needed.

Intel's E810 platform validates transceivers against an approved-vendor list stored in the NIC firmware. EdgeOptic's compatible is programmed with vendor identifiers that the E810 recognizes, so the module appears as a qualified optic in Intel Ethernet Controller diagnostics. DDM telemetry (Tx/Rx power, temperature, laser bias, supply voltage) is accessible through ethtool on Linux or Intel PROSet on Windows. The E810 also exposes per-lane FEC counters, which are useful for monitoring pre-FEC BER trends over time on PAM4 links.

SPTSLP4SLCDF is functionally interchangeable with other single-lambda 100G LR modules (Arista QSFP-100G-LR, Cisco QSFP-100G-LR-S) at the optical layer, but the EEPROM coding differs per vendor. Don't mix vendor-coded modules across platforms without confirming host-side compatibility. The same caution applies when connecting to a switch: both ends of the fiber link must use single-lambda PAM4 modules. A four-lane LR4 QSFP28 on the far end will not establish a link with the SPTSLP4SLCDF. For volume pricing or E810 deployment questions, contact our sales team