QDD-ER4L-400GNVIDIA/Mellanox QDD-ER4L-400G Compatible 400G QSFP-DD ER4L Transceiver Module
Built for hosts recognizing QDD-ER4L-400G, this HT-manufactured QSFP-DD module delivers 400G transmission at 1310nm. Its rated reach is 30km, with Duplex LC/UPC as the physical interface. The specifications and engineering guidance below support structured fiber installations preserve a documented and serviceable optical channel, while keeping HT manufacture separate from the OEM cross-reference.
OEM Part Number: QDD-ER4L-400GHT Part Number: QDD-ER4L-400G
Product Highlights
- Compatible alternative to NVIDIA/Mellanox QDD-ER4L-400G
- 400G connectivity at 400Gbps
- Optical wavelength: 1310nm
- Specified reach: 30km
- Duplex LC/UPC / SMF interface
- Digital diagnostic monitoring: Supported
- Operating temperature: 0 to 70°C (32 to 158°F)
Specifications
| HT Part Number | QDD-ER4L-400G |
|---|---|
| Manufacturer | HT |
| Form Factor | QSFP-DD |
| Max. Data Rate | 400Gbps |
| Wavelength | 1310nm |
| Max. Cable Distance | 30km |
| Connector | Duplex LC/UPC |
| Media | SMF |
| Transmitter Type | EML |
| Receiver Type | APD |
| TX Power | 0.4~6.5dBm |
| Minimum Receiver Power | -10.1dBm |
| Power Budget | 10.5dB |
| Receiver Overload | -3.4dB |
| Max Power Consumption | 12W |
| Extinction Ratio | 6dB |
| DDM/DOM | Supported |
| Commercial Temperature Range | 0 to 70°C (32 to 158°F) |
| Modulation (Electrical) | 8x53.125G-PAM4 |
| Modulation (Optical) | 4x106.25G-PAM4 |
| DSP | TX and RX |
| Inbuilt FEC | No |
| Bit Error Ratio (BER) | 2.4E-4 |
| MTBF | 2050000 Hours (@40°C, 60% CL)818000 Hours (@40°C, 90% CL)1300000 Hours (@55°C, 60% CL)519000 Hours (@55°C, 90% CL) |
| Packaging Technology | BOX |
| Application | Data Center, Enterprise Networking, 400G Ethernet |
| Protocols | QSFP-DD MSA, CMIS Rev4.0, IEEE 802.3, IEEE 802.3bs, OIF 56G PAM4 |
Applications and Optical Link Design
Use this module for equipment interconnection over the specified single-mode fiber plant, including enterprise backbone, campus, metro or data-center interconnect links according to its rated distance. Confirm that both ends use the same optical standard and wavelength plan, and allow for connector, splice and patch-panel loss within the stated power budget.
Before deployment, check the host port type, supported data rate and firmware requirements. The 400G interface configuration must match the remote equipment; sharing a QSFP-DD housing alone does not make two transceiver types interoperable.
Before commissioning, measure the complete single-mode channel against the stated budget for 30km. Inspect every Duplex LC/UPC connection and record diagnostic power where supported. Both ends must agree on rate, wavelength and optical standard.
NVIDIA/Mellanox Compatibility and Factory Testing
Compatibility testing for QDD-ER4L-400G combines identification with a live link and available transmit, receive and alarm information. Connector condition is inspected separately. 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 0.4~6.5dBm; the stated optical power budget is 10.5dB. 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.
Structured Fiber Pathways and Serviceability
Treat the transceiver as part of the complete channel. Follow the intended patch-panel route, maintain bend control and leave service access around the port. Confirm connector polish and fiber type at every mated pair; a documented service allowance is preferable to excess slack concealed inside a rack. For this model, the principal parameters are data rate 400Gbps, wavelength 1310nm, rated reach 30km.
Ordering Information
Use QDD-ER4L-400G as the compatibility cross-reference and QDD-ER4L-400G 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
Is this an original NVIDIA/Mellanox transceiver?
No. It is an HT-manufactured compatible alternative for equipment that specifies QDD-ER4L-400G, not an original NVIDIA/Mellanox-branded module.
Which fiber and connector are required?
Use Duplex LC/UPC with SMF. The specified maximum reach is 30km, 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.
