Arista Networks QDD-800G-2VSR4 Compatible 800G QSFP-DD Transceiver Module
The QDD-800G-2VSR4 compatible module serves equipment requiring a 800G QSFP-DD interface with 850nm optics and a 50m on OM4 rating. Connection is through Dual MTP/MPO-12 APC. Product data, application guidance and factory verification are presented together to support field technicians install, maintain and identify the exact compatible module.
OEM Part Number: QDD-800G-2VSR4HT Part Number: QDD-800G-2VSR4
Product Highlights
- Compatible alternative to Arista Networks QDD-800G-2VSR4
- 800G connectivity at 850Gbps (8x 106.25Gbps)
- Optical wavelength: 850nm
- Specified reach: 50m on OM4
- Dual MTP/MPO-12 APC / MMF interface
- Digital diagnostic monitoring: Supported
- Operating temperature: 0 to 70°C (32 to 158°F)
Specifications
| Arista Networks Compatible | QDD-800G-2VSR4 |
|---|---|
| Manufacturer | HT |
| HT Part Number | QDD-800G-2VSR4 |
| Form Factor | QSFP-DD |
| Max. Data Rate | 850Gbps (8x 106.25Gbps) |
| Wavelength | 850nm |
| Max. Cable Distance | 50m@OM4 |
| Connector | Dual MTP/MPO-12 APC |
| Media | MMF |
| Transmitter Type | VCSEL |
| Receiver Type | PIN |
| TX Power | -4.6~4dBm |
| Minimum Receiver Power | -6.3dBm |
| Power Budget | 1.7dBm |
| Receiver Overload | 4dBm |
| Power Consumption | ＜16W |
| Extinction Ratio | 2.5dB |
| Modulation (Electrical) | 8x100G-PAM4 |
| Modulation (Optical) | 8x100G-PAM4 |
| DDM/DOM | Supported |
| Commercial Temperature Range | 0 to 70°C (32 to 158°F) |
| Protocols | IEEE 802.3df, IEEE 802.3ck QSFP-DD HW Rev 6.2, CMIS Rev 4.0 |
Field Installation and Maintenance
Inspect the connector and patch lead before installation, then support the fiber without pulling on the module housing. Release the latch properly during maintenance and keep dust protection on unused interfaces. If a module is removed for later use, retain its part-number label and record its original port. For this model, the principal parameters are data rate 850Gbps (8x 106.25Gbps), wavelength 850nm, rated reach 50m on OM4.
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 Dual MTP/MPO-12 APC 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 800G 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 50m on OM4 reach. Keep the Dual MTP/MPO-12 APC 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 -4.6~4dBm; the stated optical power budget is 1.7dBm. 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.
Quality Assurance and Packaging
Each QDD-800G-2VSR4 compatible module is inspected, powered up and functionally checked before protective packing. Dust caps and individual trays shield the interface during transport. Customer references, rack groups and project packing lists can be added for volume orders.
Arista Networks Compatibility and Factory Testing
Factory verification starts with the expected QDD-800G-2VSR4 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.
Frequently Asked Questions
Is this an original Arista Networks transceiver?
No. It is an HT-manufactured compatible alternative for equipment that specifies QDD-800G-2VSR4, not an original Arista Networks-branded module.
Which fiber and connector are required?
Use Dual MTP/MPO-12 APC with MMF. The specified maximum reach is 50m on OM4, 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-800G-2VSR4 together with OEM reference QDD-800G-2VSR4 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.
