The HPE Aruba Networking JL484A is a 25GBASE-SR SFP28 optical transceiver built for short-range multimode fiber links inside data centers and enterprise buildings. It uses VCSEL and PIN technology to deliver a line-rate data throughput of 25.78125 Gbps, which reflects the 25G Ethernet line rate plus encoding overhead. That figure reflects the 25G Ethernet line rate plus encoding overhead, not a rounded marketing number.
Reach and link budget define whether the module suits your cabling plant. The JL484A supports transmission distances of up to 100 m on OM4 or OM5 multimode fiber. Its average link budget is 5.3 dB, which gives you a concrete number to compare against your measured end-to-end insertion loss before committing to a fiber run. If your measured loss exceeds that figure, the link will not operate reliably regardless of which compliant module you install.
The module sits in the compact SFP28 form factor and weighs approximately 20 g as stated in the ProLabs datasheet. That weight matters in dense deployments where you are handling dozens of modules in a single maintenance window. The SFP28 cage accepts the module with a standard bail-latch release, and no tools are required for insertion or removal.
One distinction worth stating clearly: the JL484A is a switch-side module coded for ArubaOS-CX inventory recognition. It is not interchangeable with the HPE 845398-B21, which is a server-side SFP28 adapter for HPE ProLiant systems. The two modules carry different EEPROM coding, and swapping them between platforms will cause the host device to report an unrecognized or unsupported transceiver. If you are cabling a server-to-switch link, you need the correct module on each end of the fiber.
The JL484A uses an LC duplex connector, which is standard across short-range multimode SFP28 modules. Polarity follows the standard TIA-568 straight-through convention for SR optics.
The JL484A is designed for the Aruba CX switching portfolio, specifically the CX 8325, 8360, and 6300 series platforms. Each of those families includes SFP28 slots that accept 25G short-reach modules, and the JL484A is coded to register as a supported HPE pluggable module in ArubaOS-CX inventory.
During a technical validation by E.C.I. Networks in 2024, a compatible module recorded an operating temperature of 37.9961°C under specific lab conditions. It is not a rated maximum operating temperature for the module, and you should not treat it as a thermal ceiling for your deployment planning. It is not a rated maximum operating temperature for the module, and you should not treat it as a thermal ceiling for your deployment planning.
The CX 8325 and CX 8360 are core and aggregation platforms where 25G SFP28 ports are standard. The CX 6300 series covers access and distribution roles, and 25G support on that platform depends on the specific model variant and the ArubaOS-CX firmware version running on the switch. Older firmware versions may not recognize 25G transceivers on all port groups, so confirm your firmware revision against HPE's compatibility matrix before ordering modules. Running an outdated firmware build is one of the most common reasons a physically inserted module fails to register correctly.
Slot selection also matters on multi-speed platforms. Some CX 6300 series models include ports that operate at either 1G or 25G depending on the configured speed. Set the port speed explicitly in ArubaOS-CX before inserting the module, because the switch may default to a lower speed negotiation that prevents the 25G link from coming up. A module that appears unrecognized is sometimes simply a port operating at the wrong configured rate.
The JL484A reaches up to 100 m on OM4 or OM5 multimode fiber, with a link budget of 5.3 dB. On OM3, the reach is shorter. No published specification gives an exact OM3 distance for this module, so treat any OM3 run as a reduced-reach scenario and measure your actual insertion loss before committing.
The 5.3 dB link budget is your practical decision tool. Measure end-to-end insertion loss on the fiber run using an optical loss test set. If your measured loss is below 5.3 dB, the link will operate reliably on either OM3 or OM4. If it exceeds that figure, the link is at risk regardless of fiber grade.
OM3 cable is common in older enterprise buildings installed before 2010. If your cabling plant is OM3 and your runs stay short, measured loss will usually fall within budget. Longer OM3 runs or runs with multiple connectors and splices accumulate loss faster, and those are the cases where upgrading to OM4 patch cables or trunk cables makes sense.
For new installations, OM4 meets the full 100 m reach with margin to spare and is widely available at a lower cost than OM5. OM5 adds support for wideband multimode applications if you plan to deploy SWDM4 optics on the same plant later, but for a straightforward 25GBASE-SR deployment, OM4 is sufficient.
The practical rule: measure first, then decide. If your existing OM3 plant passes the loss test, you do not need to recable.
Installing a JL484A compatible module takes five steps. Skipping the RS-FEC configuration step is the most common reason a 25G link fails to come up even when the module itself is functioning correctly.
Enable RS-FEC on the host port before inserting the module. Reed-Solomon Forward Error Correction is required for 25GBASE-SR operation [S1]. At 25G, the raw bit error rate on multimode fiber is high enough that the link layer cannot sustain reliable throughput without FEC. RS-FEC adds overhead that corrects burst errors before they reach the MAC layer. In ArubaOS-CX, configure FEC on the interface before the module is seated, so the port is ready to negotiate correctly on link-up.
Identify a compatible SFP28 slot on your Aruba CX 8325, 8360, or 6300 series switch [S2]. On multi-speed platforms, confirm the port is set to 25G speed in the interface configuration. A port left at auto-negotiation or defaulting to a lower speed will not bring up a 25GBASE-SR link even with a correctly coded module installed.
Handle the module carefully before insertion. Keep it in its anti-static bag until you are ready to seat it. Inspect the LC duplex fiber connectors and clean them with an appropriate fiber cleaning tool if there is any visible contamination. Dirty connectors are a leading cause of intermittent link errors and elevated bit error rates on short-reach multimode links.
Insert the module into the SFP28 slot until the bail latch clicks into place. No tools are required. Connect the LC duplex fiber cable, observing correct TX-to-RX polarity. Standard TIA-568 straight-through patch cables work for SR optics on this module.
Use ArubaOS-CX transceiver inspection commands to confirm the module is registered as a supported HPE pluggable module [S3]. The output will show the module's vendor name, part number, serial number, and optical power levels. Confirm that the received optical power falls within the module's sensitivity range. If the switch reports an unrecognized transceiver, check the firmware version first, then check whether the platform requires a CLI command to permit third-party modules. That command is not confirmed in HPE's public documentation for every CX platform, so consult your specific ArubaOS-CX release notes rather than assuming a single syntax applies universally.
If the link comes up but shows errors, check fiber polarity, re-clean the connectors, and verify that RS-FEC is active on both ends of the link. A crossed fiber pair (TX connected to TX) is a common wiring mistake that produces no light on the receiver and is easy to overlook during a dense port installation.
Third-party modules that meet the same 25GBASE-SR specification as the OEM JL484A are widely available, and the right choice depends on your platform requirements, compliance needs, and sourcing priorities. The table below compares the three main options across the factors that matter most at the point of purchase.
| Module | Standard | TAA Compliant | Pricing |
|---|---|---|---|
| HPE Aruba Networking JL484A | 25GBASE-SR, MSA | Not specified | OEM list pricing applies |
| ProLabs JL484A-C | 25GBASE-SR, MSA | Yes | Not publicly listed |
| StarTech.com JL484A-ST | 25GBASE-SR, MSA | Not specified | Not publicly listed |
The OEM JL484A carries EEPROM coding specific to ArubaOS-CX, which means the switch recognizes it immediately in inventory without any additional configuration. That recognition matters if your operations team tracks pluggable inventory through the switch's management plane. The tradeoff is OEM list pricing, which tends to be higher than compatible alternatives.
The ProLabs JL484A-C is TAA-compliant, which is a requirement for US federal procurement and some state and local government contracts. Per micro-processor.com, it is uniquely serialized and data-traffic tested for performance equivalent to the OEM module, and it is built to MSA standards. If your deployment is subject to Trade Agreements Act rules, this is the only compatible option in the table that explicitly meets that requirement.
The StarTech.com JL484A-ST is MSA-compliant and, per media.startech.com, is designed for use with HPE equipment and other brands that accept uncoded modules, including Ubiquiti and D-Link. That broader compatibility makes it a practical choice if you are sourcing a single module type across a mixed-vendor environment. Its low-latency SR design targets data center and building sub-network use cases directly.
Neither the ProLabs nor the StarTech module is officially sanctioned by HPE. Using a third-party module on an Aruba CX switch may require a CLI command to allow unsupported transceivers, depending on the ArubaOS-CX version and platform. That command is not confirmed in HPE's public documentation for every CX model, so check your specific release notes before assuming a compatible module will register without additional configuration.
Power consumption figures are not published for any of the three modules, so you cannot use wattage as a differentiator here. Focus instead on TAA status, vendor support terms, and whether your ArubaOS-CX firmware version requires explicit permission for third-party pluggables.
Third-party sourcing makes sense in specific situations, and it is worth being clear about what those are rather than treating it as a default cost-cutting move.
The clearest case is volume. If you are deploying 25G across a large number of Aruba CX ports, the per-unit cost difference between OEM and compatible modules adds up quickly. A compatible module that meets the same 25GBASE-SR specification and passes your insertion loss test performs identically on the wire. The switch does not know the difference once the link is up and RS-FEC is active.
The second case is lead time. OEM transceivers sometimes carry extended lead times through distribution channels, particularly during periods of supply constraint. A third-party supplier with stock on hand can shorten the gap between order and installation, which matters when you are working to a project deadline or replacing a failed module in a production environment.
The third case is mixed-vendor environments. If your network includes switches from multiple vendors alongside the Aruba CX platforms, a third-party module coded to MSA standards rather than a single vendor's EEPROM profile can simplify your spares inventory. You stock one compatible SFP28 module type rather than separate OEM SKUs for each platform.
The situation where OEM sourcing is the stronger choice is when your organization has a support contract with HPE that explicitly requires OEM-coded modules, or when you are deploying in a regulated environment where TAA compliance is required and the ProLabs option is not available through your procurement channel.
HYTOPTODEVICE is a global e-commerce supplier of optical transceiver modules and networking hardware, covering a broad range of form factors including SFP28 modules compatible with Aruba CX platforms. If you want to see how the optical transceiver market is developing, their overview of top optical module leaders in co-packaged optics covers the key players.
Before placing any order, confirm the ArubaOS-CX firmware version on your target switches, verify that your fiber plant passes the 5.3 dB insertion loss threshold, and check whether your specific CX platform requires explicit CLI permission for third-party transceivers.
Prices and plan limits verified as of October 2026.
A:No. The JL484A is coded for ArubaOS-CX switch inventory recognition and carries EEPROM data specific to that platform. The HPE ProLiant server-side equivalent is the HPE 845398-B21, which carries different EEPROM coding. Installing a JL484A in a ProLiant server will cause the host to report an unrecognized or unsupported module. If you are cabling a server-to-switch link, you need the correct module at each end.
A:It may, depending on your ArubaOS-CX version and the specific CX platform. HPE's public documentation does not confirm a single command syntax that applies universally across all CX models. If a compatible module is inserted and the switch reports it as unrecognized, check your ArubaOS-CX release notes for the relevant firmware version. Do not assume a single command works across all platforms without verifying it for your specific build.
A:According to ProLabs, the host board requires a pull-up resistor in the range of 4.7 KΩ to 10 KΩ for the transceiver's open collector output. This is a hardware design consideration for custom or white-box switching platforms. Standard Aruba CX switches are designed to meet this requirement internally, so it is not a concern for typical deployments on supported platforms.
A:The JL484A has an average link budget of 5.3 dB. That figure represents the maximum optical loss the link can tolerate between transmitter and receiver, accounting for connector losses, splice losses, and fiber attenuation. Before deploying over any fiber run, measure end-to-end insertion loss with an optical loss test set. If your measured loss exceeds that threshold, the link will not operate reliably regardless of which compliant module you use.
A:Yes. The CX 6300 series covers access and distribution roles, and 25G transceiver support on that platform depends on both the model variant and the ArubaOS-CX firmware version installed. Older firmware builds may not recognize 25G modules on all port groups. Check HPE's compatibility matrix for your specific model and confirm your firmware revision before ordering. Running outdated firmware is one of the most common reasons a physically inserted module fails to register correctly.
The JL484A is a 25GBASE-SR SFP28 module with a 5.3 dB link budget, and it is supported on Aruba CX 8325, 8360, and 6300 series switches. Compatible alternatives from ProLabs and StarTech meet the same MSA specification, with ProLabs adding TAA compliance for government procurement. The OEM module registers in ArubaOS-CX inventory automatically; third-party modules may need additional CLI configuration depending on your firmware version.
Before you order, measure your fiber plant's insertion loss, confirm your ArubaOS-CX firmware version supports 25G on the target port group, and decide whether TAA compliance is a requirement for your procurement channel. If you are deploying across multiple switch generations or sourcing at volume, check whether a single compatible SFP28 module type covers all your platforms and simplifies your spares inventory.
