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

EdgeOptic's R0R42A compatible is an HPE-coded version of the EdgeOptic 25G-SFP28-100 multi-vendor 25GBASE-SR SFP28 transceiver, a direct replacement for the HPE 25Gb SFP28 SR 30m Transceiver (OEM part R0R42A, spare-part P15892-001). It ships with HPE-recognized EEPROM so HPE Synergy and ProLiant DL hosts identify the optic as a native HPE part. Link-up, receive-optical-signal and DOM telemetry surface through iLO and the standard NIC driver stack.

Optical behavior is 25GBASE-SR per IEEE 802.3by Clause 112 over duplex multimode fiber. HPE rates R0R42A at 30 m over OM3 and OM4 as a conservative procurement target suited to server-side cabling. The underlying module is the same 25GBASE-SR physical optic that backs the EdgeOptic 25G-SFP28-100 root product, specified at 70 m on OM3 and 100 m on OM4 per IEEE 802.3by tolerances, so the module has margin beyond the HPE 30 m label on clean cabling. For procurement planning, follow the HPE 30 m rating. The module operates dual-rate per the 25G-SFP28-100 root spec: 25.78 Gbps for 25GBASE-SR and 10.31 Gbps for 10GBASE-SR per IEEE 802.3by. TX power −5 dBm minimum and +2.4 dBm maximum, RX sensitivity −10.3 dBm, 5.3 dB link budget with host RS-FEC per IEEE 802.3by Clause 108. Duplex LC/UPC connector, DOM per SFF-8472, 0.3 W maximum, 0 to 70 °C commercial operating range.

R0R42A is the HPE Networking 25Gb SFP28 SR optic labelled at the 30 m reach tier, distinct from Q2P64A which is the 100 m SFP28 SR OPN positioned for top-of-rack and leaf-switch aggregation. R0R42A is the procurement match for HPE Synergy compute modules with 25 GbE mezzanine adapters, ProLiant DL servers carrying HPE 25 GbE NICs and FlexFabric 10/25 Gb adapters configured for storage-fabric or server-to-top-of-rack runs under 30 m. Verify the adapter-to-chassis qualification for the specific HPE Synergy or ProLiant generation against the HPE Server Hardware Compatibility Matrix and per-chassis QuickSpecs.

On HPE hosts the practical interoperability concern is the optical-validation check that iLO and the NIC firmware run on insertion. The HPE-coded EEPROM lets the module register cleanly through the iLO and NIC optical-validation path on default ProLiant and Synergy firmware images. Environments running hardened validation policies or strict asset-inventory controls should verify the expected vendor and PN strings against the local policy before deployment. The HPE Server Hardware Compatibility Matrix and the per-chassis QuickSpecs 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, host 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 valid alternate modes where both link partners are configured for the same FEC profile at the MAC layer. DOM registers for transmit power, receive power, supply voltage, laser bias and module case temperature are exposed through standard SFF-8472 reads, surfaced by iLO and the host NIC driver stack on default ProLiant and Synergy firmware images.

Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms. Ships next business day from EU stock with a lifetime warranty. For volume pricing or cross-reference against Q2P64A for longer 100 m runs and against 845398-B21 for ProLiant server NIC spares, contact our sales team.