FTLX8571D3BCVI31 Intel Compatible 10GBASE-SR SFP+ Transceiver

FTLX8571D3BCVI31 is the Intel-coded variant of the Finisar (now Coherent) FTLX8571D3BCV 10GBASE-SR SFP+. The -I31 suffix identifies Intel EEPROM programming, so the module is qualified against Intel Ethernet adapters that expect Intel-branded optics. EdgeOptic's compatible carries the Intel-recognized vendor ID block, which lets X520, X710 and E810 adapters accept the optic without driver overrides such as allow_unsupported_sfp. The base BCV module has multiple EEPROM-coded siblings (CV, CL, IT, I31) that share optical hardware but differ in their host-vendor vendor ID block; -I31 is the Intel build.

Qualified Intel host platforms include X520-DA2, X520-SR2, X710-DA2, X710-DA4, and the E810-XXVDA2. X540 and X550 are 10GBASE-T copper adapters with RJ45 cages and do not accept SFP+ optics, so this module does not apply to those part numbers. Finisar's optical business was rebranded under Coherent in 2022, which changed the vendor logo on some later production runs; the optical reference and the IEEE 802.3ae Clause 52 specification are unchanged. EdgeOptic programs each -I31 unit to match the Intel-native vendor ID that ixgbe, i40e, and ice drivers expect at port initialization.

Optical build: 850 nm VCSEL transmitter, 850 nm PIN photodiode receiver, 6.1 dB minimum link budget, dual LC. Reach is 300 m over OM3 and 400 m over OM4 with fully characterized fiber. Line rate is 10.3125 Gbps per the 10GBASE-SR standard. DOM per SFF-8472 exposes TX power, RX power, bias current, module temperature and supply voltage, readable from ethtool -m on Linux and from Intel PROSet on Windows. Mechanical and electrical characteristics conform to SFF-8432 with a standard 0 to 70 degrees Celsius commercial envelope. Typical deployment is short-reach server-to-leaf and leaf-to-spine links inside a single data center hall where OM3 or OM4 multimode is already installed. Both ends of the link must be SR optics on MMF; mixing SR with an LR long-reach module will not bring the PHY layer up.

For Intel platform validation on specific adapter firmware revisions, lot-level programming options, DDM calibration ranges, or bulk quotations for X710 or E810 refresh projects, contact our sales team for a tailored response.