Allied Telesis AT-QSFP28LR4 – 100G QSFP28 LR4 Transceiver 10km Single-Mode Fiber

Product Overview

The Allied Telesis AT-QSFP28LR4 is a 100 Gigabit Ethernet QSFP28 transceiver module engineered for long-reach single-mode fiber interconnects in data center and enterprise backbone applications. This Allied Telesis 100G QSFP28 LR4 10km single-mode fiber transceiver delivers full 100GbE throughput over a single duplex LC fiber pair using four wavelength-division multiplexed 25G lanes operating in the 1295–1310 nm range. Unlike parallel SR4 modules that require MPO connectors and OM3/OM4 multimode fiber, the LR4 variant targets campus backbone runs and inter-data-center links where single-mode infrastructure is already deployed. Available from Creation Networks, the AT-QSFP28LR4 is fully MSA-compliant and hot-swappable for use in any compatible Allied Telesis device with QSFP28 ports.

Product Description

The AT-QSFP28LR4 implements the IEEE 802.3ba 100GBASE-LR4 standard, transmitting 100 Gbps aggregate bandwidth by multiplexing four independent 25 Gbps channels across distinct WDM wavelengths (approximately 1295, 1300, 1305, and 1310 nm) over a single-mode fiber pair terminated with LC duplex connectors. This architecture contrasts directly with the SR4 variant, which uses four parallel multimode fibers via an MPO-12 connector and is limited to 70–100 meters depending on fiber grade. The LR4 reaches up to 10 kilometers, making it the correct choice for inter-building links, metro-area data center interconnect, and any deployment where existing single-mode plant is the standard. Power consumption is rated at a maximum of 4.0 W, consistent with QSFP28 MSA specifications for LR4 class modules. The SFF-8665 (QSFP28 Solution) Revision 1.8 electrical interface ensures compatibility with host equipment that meets the same standard. Operating case temperature is 0 to 70°C, suitable for both data center and wiring closet environments. The module is hot-swappable, allowing field replacement without chassis power cycling or network reconfiguration. Compliant with MSA and IEEE 802.3ba, the AT-QSFP28LR4 is also interoperable with third-party switches and routers that implement the same 100GBASE-LR4 standard, providing flexibility in mixed-vendor environments. Country of origin is Singapore. This Allied Telesis 100G QSFP28 LR4 10km single-mode fiber transceiver is stocked and available for immediate purchase at Creation Networks.

Key Features

• 100GBASE-LR4 Standard Compliance — Implements IEEE 802.3ba, ensuring interoperability with any standards-compliant QSFP28 host port in mixed-vendor environments.
• 4x 25G WDM Lane Architecture — Multiplexes four 25 Gbps lanes across distinct wavelengths (1295–1310 nm) on a single duplex LC single-mode fiber pair, eliminating the need for parallel fiber infrastructure.
• 10 km Single-Mode Reach — Supports inter-building campus backbone runs and data center interconnect distances up to 10 km on standard G.652 single-mode fiber.
• LC Duplex Connector — Uses industry-standard LC duplex connectors compatible with existing single-mode patch panels and cassettes.
• Hot-Swappable Form Factor — Field-replaceable without powering down the host chassis, minimizing service disruption during maintenance windows.
• Low Power Consumption — Maximum 4.0 W power draw, within QSFP28 MSA thermal and power envelope specifications.
• MSA and SFF-8665 Compliant — Meets QSFP28 Multi-Source Agreement and SFF-8665 Rev 1.8 electrical interface specifications for broad host compatibility.
• 0–70°C Operating Range — Suitable for standard data center and enterprise equipment room environments.
• Environmentally Compliant — Meets RoHS requirements, supporting green procurement mandates in enterprise and government procurement frameworks.

Typical Applications

• Data center spine-to-leaf 100GbE interconnects where inter-row or inter-pod distances exceed SR4 multimode reach limits.
• Campus backbone links between buildings over existing single-mode fiber infrastructure, eliminating the need to deploy new parallel fiber runs.
• Inter-data-center connectivity for metro-area active-active or disaster recovery configurations requiring 100G throughput over distances up to 10 km.
• Core switch and router uplinks in enterprise network distributions where 100GbE single-mode fiber connections are standardized.
• High-density 100G aggregation layers in telecom and data networking environments requiring IEEE 802.3ba compliance.

Technical Specifications

Frequently Asked Questions

Q: What is the difference between the AT-QSFP28LR4 and an SR4 module?

The LR4 uses four WDM wavelengths on a single duplex LC single-mode fiber pair and reaches up to 10 km. The SR4 uses four parallel multimode fibers via an MPO-12 connector and is limited to 70–100 meters. LR4 is the correct choice when single-mode fiber infrastructure is deployed or when distances exceed multimode reach limits.

Q: Which Allied Telesis switches are compatible with the AT-QSFP28LR4?

The AT-QSFP28LR4 is supported on all Allied Telesis devices with QSFP28 uplink ports. Consult the compatibility matrix in the Allied Telesis product documentation or contact Creation Networks to verify compatibility with your specific platform and AlliedWare Plus firmware version.

Q: Can this transceiver be used with third-party switches?

Yes. The AT-QSFP28LR4 is MSA-compliant and meets IEEE 802.3ba 100GBASE-LR4, making it interoperable with third-party switches and routers that implement the same standard. Third-party compatibility is not guaranteed by Allied Telesis and should be validated before deployment.

Q: Does the AT-QSFP28LR4 support digital diagnostics monitoring (DDM)?

Allied Telesis QSFP28 modules in this series support standard optical monitoring parameters. Consult the Allied Telesis product datasheet for the full list of supported QSFP28 management data interface fields.

Q: What fiber type and connector does this module require?

The AT-QSFP28LR4 requires standard single-mode fiber (OS1/OS2, G.652) terminated with LC duplex connectors. It is not compatible with multimode fiber.

Q: What is the maximum power draw of this transceiver?

The AT-QSFP28LR4 draws a maximum of 4.0 W, within the QSFP28 MSA power class specification for LR4 modules.

Q: Where can I order the AT-QSFP28LR4?

The AT-QSFP28LR4 is available from Creation Networks, an authorized Allied Telesis reseller with competitive pricing and technical pre-sales support.