HPE JL743A 100G QSFP28 ER4 Single-Mode Fiber Transceiver

Overview

The HPE JL743A is a QSFP28 100GBase-ER4 transceiver designed to carry 100 Gigabit Ethernet across single-mode fiber at distances up to 40 kilometers — the right module when you're connecting data centers, campus cores, or carrier hand-off points separated by meaningful real-world distance. It operates at 1310nm over an LC Duplex interface and includes Digital Optical Monitoring (DOM) so network teams can track optical power levels, temperature, and bias current in real time without pulling the module. If you're specifying long-haul 100G links for an HPE Aruba network infrastructure, this is the native module to reach for.

Key Features

• 40km Single-Mode Reach: At 40km over SMF, the JL743A covers metropolitan-area interconnects, campus-to-campus dark fiber runs, and co-location links where short-reach or CWDM modules fall short. You get full 100G throughput end-to-end without optical amplification or lambda conversion equipment in the path.
• 100GBase-ER4 at 1310nm: The ER4 specification uses four 25G lanes across the O-band (1310nm), which means lower chromatic dispersion on standard SMF compared to C-band alternatives — fewer insertion-loss surprises on aged or spliced plant. This matters when you're inheriting existing fiber infrastructure rather than pulling fresh strand.
• QSFP28 Form Factor: The QSFP28 cage is the standard 100G interface on current-generation 100G fiber optic transceivers and switches. It's hot-swappable, so you can replace or upgrade links during a maintenance window without taking the chassis down. Density is also favorable — QSFP28 packs four 25G electrical lanes into the same cage footprint as a legacy QSFP+.
• LC Duplex Connector: LC duplex is the dominant small-form-factor fiber connector in enterprise and carrier environments. If your patch panels and fiber distribution units are already LC-terminated — which they almost certainly are in any modern data center — the JL743A drops in without adapter hardware or re-termination work.
• Digital Optical Monitoring (DOM): DOM support means the module continuously reports transmit power, receive power, laser bias current, supply voltage, and temperature back to the switch management plane. In practice, this lets you catch a degrading transmit laser or a dirty connector before the link goes down, rather than troubleshooting a surprise outage. Most network management systems can alert on DOM thresholds out of the box.
• Commercial Temperature Range (0–70°C): The 0–70°C operating range covers standard data center and indoor telecom room environments. This is appropriate for conditioned facilities — if you're deploying in an outdoor enclosure, a hardened junction box, or an industrial environment without guaranteed HVAC, verify your ambient falls inside this envelope before specifying this module.
• MSA and IEEE Standards Compliance: Compliance with Multi-Source Agreement (MSA) and IEEE standards means the module's electrical and optical interfaces conform to the published 100G specifications — not a proprietary implementation. This is relevant for network infrastructure planning in mixed-vendor environments where interoperability and future replaceability matter.
• CE, FCC, REACH, RoHS Compliance: The module carries CE, FCC, REACH, and RoHS marks, covering North American and European market requirements. TAA and UL compliance are available upon request — relevant if your procurement team has federal or UL-site requirements to satisfy.
• Lifetime Replacement Warranty: The lifetime replacement warranty means you're not managing a 1- or 3-year clock on individual optics across a large deployment. For transceivers installed in hard-to-access locations — top-of-rack in a deep cage row, or fiber splice points in a riser — not having to track expiry dates reduces administrative overhead.

Integration & Compatibility

The JL743A is specified for HPE Aruba switching platforms that support QSFP28 100G interfaces. Before ordering, confirm your target switch model's supported transceiver list — HPE Aruba platforms validate optics against an approved module table, and using a non-approved module may trigger a warning or disable the port depending on the firmware version and switch model. The JL743A is the native HPE-part answer for 100G ER4 links on Aruba gear, avoiding compatibility flags entirely.

On the fiber plant side, this module requires OS1 or OS2 single-mode fiber. It will not operate correctly on OM3 or OM4 multimode fiber — the 1310nm wavelength and ER4 power budget are engineered for SMF. Patch cords and trunk fiber on both ends of the link must be SMF with LC connectors. Clean connectors are non-negotiable at 100G: even a marginal APC or UPC connector with contamination will eat into the link budget and show up in DOM receive-power readings before the link degrades to errors. Budget for fiber optic cleaning tools and inspection scopes at deployment.

DOM telemetry is accessible through the switch's standard optics-monitoring CLI commands and is surfaced by most enterprise NMS platforms (including those that consume standard SNMP MIB-II optical interface tables). No additional licensing is required to read DOM data on Aruba platforms.

Frequently Asked Questions

Q: What fiber type does the JL743A require?

A: The JL743A requires single-mode fiber (SMF) — OS1 or OS2 grade. It will not work on multimode fiber (OM3/OM4). Both ends of the link must use LC duplex connectors.

Q: What is the maximum supported link distance?

A: The JL743A supports link distances up to 40 kilometers over SMF. Actual achievable distance depends on fiber plant quality, splice losses, and connector cleanliness — 40km is the rated specification under standard conditions.

Q: Does the JL743A support Digital Optical Monitoring?

A: Yes. The JL743A includes DOM support, allowing real-time monitoring of transmit power, receive power, laser bias current, supply voltage, and temperature via the switch management interface.

Q: What is the warranty on the JL743A?

A: The JL743A carries a lifetime replacement warranty.

Q: Is the JL743A TAA compliant?

A: TAA compliance is available upon request. The module carries CE, FCC, REACH, and RoHS certifications as standard. Contact pre-sales to confirm TAA availability for your procurement requirement.

Q: What operating temperature range does the JL743A support?

A: The JL743A operates within a commercial temperature range of 0°C to 70°C (32°F to 158°F). It is designed for conditioned indoor environments such as data centers and telecom rooms.

James Everett

The JL743A is the module I specify when an HPE Aruba 100G deployment has inter-site links that exceed what ER4-lite or LR4 options can cover — specifically when dark fiber runs push past 10km and you need a full 40km budget without adding EDFA amplification to the bill of materials. The 1310nm ER4 specification keeps you in familiar O-band territory where dispersion management on standard G.652 SMF is straightforward.

Technical Highlights:

• 40km SMF Reach: Spans metropolitan dark fiber runs and campus-to-campus interconnects at full 100G throughput — no intermediate amplification required within the 40km envelope.
• DOM Telemetry: Real-time monitoring of Tx/Rx power, laser bias, voltage, and temperature means you can trend link health over time and catch degrading optics or dirty connectors before they produce errors, not after.
• Lifetime Replacement Warranty: Eliminates the need to track per-module warranty expiry across a large fleet — particularly valuable when modules are installed in high-density chassis rows where swap logistics are non-trivial.

Deployment Considerations:

• Confirm your HPE Aruba switch firmware version supports the JL743A on the specific line card or port you're targeting — Aruba platforms maintain an approved optics table and older firmware revisions may not recognize newer module part numbers without a firmware update first.
• The 0–70°C commercial temperature range is a hard boundary — if your deployment site is an outdoor enclosure or an industrial space without reliable HVAC, this module is not the correct choice; look at extended-temperature QSFP28 options instead.

Best fit: enterprise WAN interconnect or data center campus backbone where HPE Aruba CX or core switching hardware is already deployed and dark fiber distances fall in the 10–40km range — this is the native, no-flag module for exactly that link design.