HPE R0R42A Compatible 25GBASE-SR SFP28 30m for HPE Synergy, ProLiant DL and FlexFabric Adapters

EdgeOptic's R0R42A compatible is an HPE-coded 25GBASE-SR SFP28 transceiver built as a direct replacement for the HPE R0R42A (spare part P15892-001). It ships with HPE-recognized EEPROM so HPE Synergy frames and ProLiant DL servers identify the optic as a native HPE part through the iLO optical-validation path. Link-up, receive-optical-signal and DOM telemetry surface through iLO and the standard NIC driver stack rather than through any vendor-specific override.

Optical behavior is 25GBASE-SR per IEEE 802.3by Clause 112 over duplex multi-mode fiber. HPE rates R0R42A at 30m over OM3 and OM4, a conservative reach target suited to server-side cabling inside a rack or between adjacent cabinets. The root 25G-SFP28-100 specification reaches 70m on OM3 and 100m on OM4 at full 25GBASE-SR tolerances, so R0R42A has margin beyond the HPE 30m label on clean cabling; for procurement planning, follow the HPE 30m rating. Line signaling rate is 25.78125 Gbd, single-rate, per IEEE 802.3by Clause 112. Transmit power is -8.4 to +2.4 dBm, receive sensitivity -10.3 dBm, link budget 5.3 dB with host RS-FEC per IEEE 802.3by Clause 108. Duplex LC/UPC, DOM per SFF-8472, 0.3W typical power. Operating case temperature is 0 to 70 degrees Celsius.

R0R42A is the HPE Networking 25Gb SFP28 SR optic labelled by HPE at the 30m reach tier, distinct from Q2P64A which is the 100m SFP28 SR OPN intended for top-of-rack and leaf-switch aggregation. R0R42A is the expected SKU when a procurement team specifies an HPE Synergy compute-module NIC, a ProLiant DL server carrying a 25GbE adapter in a compact cabling topology, or an HPE FlexFabric 10/25Gb adapter for storage-fabric or server-to-top-of-rack runs under 30m. The Mellanox ConnectX silicon that HPE integrates into most 25GbE ProLiant and Synergy adapters is the same underlying ASIC as stand-alone Mellanox 25G NICs; the HPE coding layer is what distinguishes an HPE-branded optic and is what the EdgeOptic compatible replicates.

On HPE hosts the practical interoperability concern is the optical-validation check that iLO and the ConnectX firmware run on insertion. EdgeOptic's HPE-coded EEPROM carries the vendor and part-number strings that the HPE validation path expects, so on default ProLiant and Synergy firmware images the module is accepted on the standard acceptance path. Environments running hardened validation policies or strict asset-inventory controls should verify the expected vendor and PN strings against the local policy before deployment; EdgeOptic can supply the exact EEPROM strings for allowlist entry on request. The HPE Server Hardware Compatibility Matrix and the HPE QuickSpecs for the specific ProLiant or Synergy generation remain the authoritative references for adapter-to-chassis qualification.

On FEC, the R0R42A optical path is agnostic to the host FEC mode. 25G FEC is configured on the MAC layer at each link partner. In typical ProLiant-to-top-of-rack deployments terminating on an Aruba CX or FlexFabric 25G switch, RS-FEC per IEEE 802.3by Clause 108 is the default end-to-end path and is the mode this module is specified against. Clause 74 Fire Code FEC (BASE-R) and no-FEC operation are supported at the optical layer where both link partners are configured for that FEC profile. DOM registers for transmit power, receive power, supply voltage, laser bias current and module case temperature are accessible through standard SFF-8472 reads on iLO, through ethtool on Linux hosts with a compatible SFP28 driver and through the native SFP28 EEPROM access on any host. Every unit is factory-tested to the 25GBASE-SR optical specification per IEEE 802.3by Clause 112 before dispatch.

For volume pricing, HPE allowlist EEPROM strings for pre-deployment verification, or a cross-reference against Q2P64A for longer 100m runs and against 845398-B21 for server NIC spares, contact our sales team and we will respond within one business day.