Dell Q28DD-200G-2SR4 Compatible 200G QSFP-DD Transceiver Module
Built for hosts recognizing Q28DD-200G-2SR4, this HT-manufactured QSFP-DD module delivers 200G transmission at 850nm. Its rated reach is 100m, with MPO-24/UPC as the physical interface. The specifications and engineering guidance below support project teams keep OEM references, delivery records and port schedules aligned, while keeping HT manufacture separate from the OEM cross-reference.
OEM Part Number: Q28DD-200G-2SR4HT Part Number: QDD-SR4-2X100G
Product Highlights
- Compatible alternative to Dell Q28DD-200G-2SR4
- 200G connectivity at 206.24Gbps(8x 25.78Gbps)
- Optical wavelength: 850nm
- Specified reach: 100m
- MPO-24/UPC / MMF interface
- Digital diagnostic monitoring: Supported
- Operating temperature: 0 to 70°C (32 to 158°F)
Specifications
| Dell Compatible | Q28DD-200G-2SR4 |
|---|---|
| Manufacturer | HT |
| HT Part Number | QDD-SR4-2X100G |
| Form Factor | QSFP-DD |
| Max. Data Rate | 206.24Gbps(8x 25.78Gbps) |
| Wavelength | 850nm |
| Max. Cable Distance | 100m |
| Connector | MPO-24/UPC |
| Media | MMF |
| Transmitter Type | VCSEL |
| Receiver Type | PIN |
| TX Power | -8.4~2.4dBm |
| Minimum Receiver Power | -10.3dBm |
| Power Budget | 1.9dB |
| Receiver Overload | 3.4dBm |
| Max. Power Consumption | 4.5W |
| Extinction Ratio | ＞2dB |
| DDM/DOM | Supported |
| Commercial Temperature Range | 0 to 70°C (32 to 158°F) |
| Modulation (Electrical) | 8x25G-NRZ |
| Modulation (Optical) | 8x25G-NRZ |
| CDR (Clock and Data Recovery) | TX & RX Built-in CDR |
| Inbuilt FEC | No |
| Protocols | IEEE 802.3bm, QSFP-DD MSA Compliant, CMIS 4.0 |
Project Documentation and Traceability
Large deployments are easier to audit when the order code, optical standard and endpoint record agree. Keep the OEM reference in the compatibility document and the HT part number on the packing list. Labels and carton groups can be arranged by rack or port plan so installers need not identify modules by appearance. For this model, the principal parameters are data rate 206.24Gbps(8x 25.78Gbps), wavelength 850nm, rated reach 100m.
Dell Compatibility and Factory Testing
Factory verification starts with the expected Q28DD-200G-2SR4 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.
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 MPO-24/UPC 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 200G interface configuration must match the remote equipment; sharing a QSFP-DD housing alone does not make two transceiver types interoperable.
The multimode channel should use the fiber grade associated with the stated 100m reach. Keep the MPO-24/UPC end faces clean and avoid tight bends. Different multimode standards are not interchangeable merely because they share a connector.
Optical Acceptance, Diagnostics and Handling
For this model, the specified transmit-power range is -8.4~2.4dBm; the stated optical power budget is 1.9dB. During commissioning, record the host diagnostic readings after the link has stabilized and compare them with those limits. DOM values are useful operational indicators, but they do not replace calibrated optical measurements when a link is marginal. Investigate unexpected loss through connector inspection, cleaning and a channel measurement before replacing the module. 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.
Frequently Asked Questions
Is this an original Dell transceiver?
No. It is an HT-manufactured compatible alternative for equipment that specifies Q28DD-200G-2SR4, not an original Dell-branded module.
Which fiber and connector are required?
Use MPO-24/UPC with MMF. The specified maximum reach is 100m, subject to fiber quality and total link loss.
Can it be mixed with another wavelength or reach version?
Only when the two ends share the same optical standard, wavelength plan and supported data rate. Check the exact part numbers and link budget rather than relying only on the module form factor.
Ordering Information
Quote HT part number QDD-SR4-2X100G together with OEM reference Q28DD-200G-2SR4 and quantity. Add the host model and software release when pre-order verification is required. 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.
