Dell Q28-40/100G-SM4 Compatible 100G QSFP28 SM4 Transceiver Module

Product Highlights

• Compatible alternative to Dell Q28-40/100G-SM4
• 100G connectivity at Dual Rate 40 Gbps and 100 Gbps
• Optical wavelength: 850/880/910/940nm
• Specified reach: 100G: 75m on OM3 / 100m on OM4 / 150m on OM540G: 240m on OM3 / 350m on OM4 / 440m on OM5
• Duplex LC / MMF interface
• Digital diagnostic monitoring: Supported
• Operating temperature: 0 to 70°C (32 to 158°F)

Specifications

Applications and Optical Link Design

Typical deployments include switch-to-switch, switch-to-server and aggregation links inside a data hall or between adjacent equipment rooms. The Duplex LC interface connects to the specified multimode cabling, and the stated reach depends on fiber grade and link loss. Keep this interface on the matching multimode optical standard rather than connecting it directly to a single-mode wavelength or reach variant.

Before deployment, check the host port type, supported data rate and firmware requirements. The 100G interface configuration must match the remote equipment; sharing a QSFP28 housing alone does not make two transceiver types interoperable.

For this multimode module, confirm fiber grade, modal bandwidth and total loss before commissioning. The 100G: 75m on OM3 / 100m on OM4 / 150m on OM540G: 240m on OM3 / 350m on OM4 / 440m on OM5 figure applies only under suitable cabling conditions. Inspect every Duplex LC mating point and match the remote optical standard.

Dell Compatibility and Factory Testing

Factory verification starts with the expected Q28-40/100G-SM4 identity and finishes with an operating host link. EEPROM data, diagnostic visibility and the stated optical parameters are assessed together. Equipment model, hardware revision and software release can be reviewed before dispatch where platform behavior is uncertain.

Optical Acceptance, Diagnostics and Handling

For this model, the specified transmit-power range is 100G: -7.5~2 dBm 40G: -7.5~3 dBm; the stated optical power budget is 100G: 1.9dB40G: 2dB. Digital diagnostics make later maintenance easier when baseline values are captured at installation. Save the initial readings with the port and OEM reference, then investigate meaningful changes rather than reacting to a single transient value. Diagnostic support depends on the host as well as the module, so unavailable fields should be confirmed with the platform documentation. Diagnostic monitoring is listed as Supported. Before every insertion, keep dust caps in place until the patch lead is ready, avoid touching the optical end face and use an appropriate inspection and cleaning procedure. Do not look into an active optical interface.

Interoperability and Host Configuration

Check three layers before deployment: host acceptance of the module identity, port support for the stated rate, and a matching optical standard at the remote interface. For breakout operation, confirm lane configuration too. Similar-looking cages can behave differently across speeds and firmware settings. For this model, the principal parameters are data rate Dual Rate 40 Gbps and 100 Gbps, wavelength 850/880/910/940nm, rated reach 100G: 75m on OM3 / 100m on OM4 / 150m on OM540G: 240m on OM3 / 350m on OM4 / 440m on OM5.

Ordering Information

Use Q28-40/100G-SM4 as the compatibility cross-reference and QSFP-MBIDI-100G as the HT ordering identity. Keep other reaches or wavelength directions on separate order lines. Neutral labels, customer packaging and project-specific compatibility review are available on request.

Shipping and Lead Time

Standard configurations normally ship within one to three working days, with production lead times confirmed for larger quantities. International courier, air freight and sea freight are available; customer courier accounts and nominated forwarders are accepted.

Quality Assurance and Packaging

Quality control covers the optical or electrical interface, host identification and operating link. The verified unit is then individually protected and cartoned. Customer references, rack groups and project packing lists can be added for volume orders.

Frequently Asked Questions