HPE Q2P64A Compatible 25GBASE-SR SFP28 100m for HPE ProLiant DL and HPE Aruba CX

EdgeOptic's Q2P64A compatible is an HPE-coded 25GBASE-SR SFP28 transceiver built as a direct replacement for the HPE Q2P64A (spare part 878406-001). It ships with HPE-recognized EEPROM so HPE ProLiant DL server NICs and HPE Aruba CX switch ports identify the optic as a native HPE part. HPE labels this SKU 'SFP28 SW' (Short Wave) in the product catalog, which is HPE's internal naming convention for the 850nm 25GBASE-SR specification; the IEEE standard and the optical behavior are 25GBASE-SR per IEEE 802.3by Clause 112.

Optical behavior is 25GBASE-SR per IEEE 802.3by Clause 112 over duplex multi-mode fiber: 100m on OM4, 70m on OM3. HPE labels Q2P64A at the 100m tier, the standard 25GBASE-SR reach on OM4 and the expected tier for server-to-top-of-rack and switch-to-switch aggregation runs. 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.

Q2P64A is the HPE Networking 25Gb SFP28 SR optic specified against the 100m reach tier, distinct from R0R42A which is the shorter-reach 30m SFP28 SR OPN for server-blade and compact-cabinet cabling inside HPE Synergy frames. Q2P64A is the expected SKU for a ProLiant DL server with a 25GbE NIC terminating on a top-of-rack or leaf switch at standard rack-to-rack distance, for an HPE Aruba CX switch port serving a 25G downlink, and for switch-to-switch aggregation runs on OM4 MMF. On the NIC side, HPE builds most 25GbE ProLiant and Synergy adapters on Mellanox ConnectX-5 and ConnectX-6 silicon; the HPE coding layer is what distinguishes an HPE-branded optic from a stand-alone Mellanox optic and is what the EdgeOptic compatible replicates.

On HPE hosts the practical interoperability concern is the optical-validation check that iLO on ProLiant DL and AOS-CX on Aruba CX run on insertion. EdgeOptic's HPE-coded EEPROM carries the vendor and part-number strings that the HPE validation paths expect, so on default ProLiant and AOS-CX 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 Aruba AOS-S and AOS-CX Transceiver Guide remain the authoritative references for per-chassis qualification and per-switch-family qualification respectively.

On FEC, the Q2P64A 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-Aruba-CX and Aruba-CX-to-Aruba-CX deployments, 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 the Aruba CX transceiver diagnostic interface on AOS-CX switch ports, 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 against a specific ProLiant or Aruba CX chassis, or a cross-reference against R0R42A for runs under 30m and against 845398-B21 for ProLiant server NIC spares, contact our sales team and we will respond within one business day.