Specifications
800G QSFP-DD Transceivers for High-Performance Networks
Reliable, high-density 800G optical connectivity designed for modern data centers, cloud networks, AI and machine-learning fabrics, high-performance computing environments, and switch-to-switch interconnects. The E.C.I. NETWORKS QDD800 delivers 800 Gigabit Ethernet connectivity through eight parallel 100G PAM4 optical lanes operating in the 1310 nm wavelength band.
Key Features
- Hot-pluggable QSFP-DD800 form factor
- 800 Gigabit Ethernet aggregate data rate
- Two independent 400G FR4 optical interfaces
- Eight electrical and optical lanes operating at up to 106.25 Gb/s per lane
- 53.125 GBd PAM4 signaling per lane
- Two groups of four CWDM optical wavelengths
- Nominal wavelengths of 1271, 1291, 1311, and 1331 nm per 400G FR4 interface
- Eight high-performance 100G PAM4 EML transmitters
- Dual duplex LC optical interface
- Up to 2 km transmission over single-mode fiber
- IEEE 802.3cu-2021 alignment
- IEEE 802.3ck-2022 electrical interface alignment
- QSFP-DD MSA compliant
- CMIS Revision 5.1 or later
- Integrated digital diagnostic monitoring
- Two-wire I²C management interface
- Single 3.3 V power supply
- Maximum power consumption of 14 W
- Commercial operating temperature: 0°C to +70°C
- Storage temperature: −40°C to +85°C
- International Class 1 laser safety certified
- RoHS 6.0 compliant
800G QSFP-DD 2×400G FR4 Optical Transceiver
The EN-QDD800-2FR4 is an 800GbE QSFP-DD800 optical transceiver designed for single-mode fiber links up to 2 km. The module incorporates two independent 400G FR4 optical engines within one QSFP-DD800 package.
The module converts eight PAM4 electrical input lanes, each operating at up to 106.25 Gb/s, into eight optical signals organized as two groups of four CWDM wavelengths. Within each 400G FR4 interface, the four optical wavelengths are multiplexed onto one transmit fiber. On the receiver side, the incoming wavelengths are demultiplexed from one receive fiber and converted into four PAM4 electrical output lanes.
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Part Number | EN-QDD800-2FR4 | Product Type | 800G QSFP-DD800 2×400G FR4 optical transceiver |
| Form Factor | Hot-pluggable QSFP-DD800 | Host Connector | 76-position QSFP-DD host interface |
| Aggregate Data Rate | 800Gb/s | Optical Interfaces | Two independent 400G FR4 interfaces |
| Per-Lane Data Rate | Up to 106.25 Gb/s PAM4 | Signaling Rate | 53.125 GBd per lane, ±100 ppm |
| Electrical Lane Configuration | Eight PAM4 host lanes | Optical Lane Configuration | Eight optical lanes arranged as two four-lane CWDM groups |
| Modulation | PAM4 | Optical Architecture | Two independent CWDM4 multiplexed optical engines |
| Standards Compliance | IEEE 802.3cu-2021, IEEE 802.3ck-2022, QSFP-DD MSA and CMIS 5.1 or later | Application | 800G Ethernet using 2×400G FR4 |
| Nominal Wavelengths | 1271, 1291, 1311 and 1331 nm per 400G interface | Number of Wavelengths | Four wavelengths per 400G engine; eight optical lanes total |
| Wavelength Ranges | 1264.5–1277.5 nm, 1284.5–1297.5 nm, 1304.5–1317.5 nm and 1324.5–1337.5 nm | Wavelength Multiplexing | Four CWDM wavelengths multiplexed onto each transmit fiber |
| Transmitter Type | Eight 100G PAM4 EML transmitters | Detector Type | Eight photodiode receivers |
| Optical Connector | Dual duplex LC receptacles | Fiber Type | Single-mode fiber |
| Fiber Count | Four fibers: two transmit and two receive | Maximum Reach | Up to 2 km over SMF |
| Link Configuration | Two independent duplex SMF links | Typical Cabling | Two duplex LC-to-LC single-mode patch cables |
| Average Transmit Power | −3.2 to +4.4 dBm per optical lane | Total Average Launch Power | Maximum 10.4 dBm |
| Maximum Transmitter OMAouter | +3.7 dBm per lane | Maximum TDECQ | 3.4 dB |
| Minimum Transmitter OMAouter | −0.2 dBm for TDECQ below 1.4 dB; otherwise TDECQ − 1.6 dBm | Transmitter Power Difference | Maximum 3.9 dB OMAouter between any two lanes |
| Extinction Ratio | Minimum 3.5 dB per lane | Side-Mode Suppression Ratio | Minimum 30 dB |
| Transmitter Reflectance | Maximum −26 dB | Optical Return-Loss Tolerance | 17.1 dB |
| Average Receive Power | −7.2 to +4.4 dBm per lane | Receiver Damage Threshold | +5.4 dBm per lane |
| Maximum Receive OMAouter | +3.7 dBm per lane | Receiver Reflectance | Maximum −26 dB |
| Receiver Sensitivity | −4.6 dBm OMAouter for TECQ below 1.4 dB; otherwise TECQ − 6 dBm | Stressed Receiver Sensitivity | −2.6 dBm OMAouter per lane |
| Maximum SECQ | 3.4 dB | Aggressor-Lane OMAouter | 1.4 dBm |
| Approximate Optical Budget | Approximately 4.0 dB based on average transmit and receive power limits | Sensitivity Test BER | Receiver sensitivity listed at BER 2 × 10⁻⁴ |
| FEC | Not specified in the module datasheet; configure according to host-platform and 400G FR4 requirements | Breakout Capability | Platform-dependent 800G to 2×400G FR4 operation |
| Breakout Connections | Two independent duplex LC 400G connections | Breakout Cabling | Two duplex LC-to-LC SMF patch cables |
| Management Interface | Two-wire I²C interface | Management Standard | CMIS Revision 5.1 or later |
| Digital Diagnostics | Integrated DDM/DOM functionality | I²C Clock Frequency | 100 to 1000 kHz |
| Power Supply | 3.3 V nominal | Supply Range | 3.135 to 3.465 V |
| Maximum Power Consumption | 14 W | Operating Temperature | 0°C to +70°C |
| Storage Temperature | −40°C to +85°C | Relative Humidity | 5% to 85% |
| Laser Safety | International Class 1 laser product | Environmental Compliance | RoHS 6.0 |
| Recommended Cable | Two duplex single-mode LC-to-LC patch cables | Primary Applications | Data centers, AI fabrics, HPC networks, switch and router interconnects |
Connectivity examples
800G to 800G Direct Connectivity
800G to 2x 400GE Breakout Connectivity
Selection Guide
Which 100G Transceiver Should I Choose? Selecting the right 100G transceiver depends on distance, fiber type, and infrastructure. Use the guide below to quickly identify the best option for your deployment.
| Selection Criteria | Option | Recommended Transceiver | Fiber / Connector | Typical Use Case |
|---|---|---|---|---|
| Host Form Factor | QSFP-DD800 | QDD800-DR8-M16, QSFP-DD800 SR8, 2 × FR4 or 2 × LR4 | 76-position QSFP-DD host interface | High-density switches, routers, cloud platforms and AI fabrics |
| Host Form Factor | OSFP | OSFP DR8, SR8, 2 × FR4, 2 × LR4 or coherent optics | OSFP host interface; not interchangeable with QSFP-DD800 | Platforms designed specifically for OSFP modules |
| Distance | Up to 50 m | 800GBASE-VR8 or short-reach SR8 | OM4/OM5 multimode fiber; MPO-16 or dual MPO-12 depending on module | In-rack, adjacent-rack and short-row connections |
| Distance | Up to 100 m | 800GBASE-SR8 | OM4/OM5 multimode fiber; parallel MPO interface | Short-reach data-center and AI-cluster connections |
| Distance | Up to 500 m | 800GBASE-DR8 | Parallel OS2 SMF; single MPO-16/APC | Leaf-spine, switch-to-switch, aggregation and high-density breakout |
| Distance | Up to 2 km | 800GBASE-DR8-2 or 800G 2 × 400GBASE-FR4 | Parallel SMF with MPO or two duplex SMF connections with LC, depending on architecture | Large data centers, campus links and short-reach DCI |
| Distance | Up to 10 km | 800G 2 × 400GBASE-LR4 | Single-mode fiber; normally two duplex LC connections | Campus, metro-access and inter-building connections |
| Distance | Up to approximately 120 km | 800ZR coherent optic, where supported | Duplex SMF LC; amplified DWDM network | Data-center interconnect and metro DWDM |
| Distance | Extended metro or regional | 800G ZR+ coherent optic, where supported | Duplex SMF LC with compatible line system | Metro, regional and long-haul transport |
| Fiber Type | Multimode OM4/OM5 | VR8 or SR8 | MPO-16 or dual MPO-12 | Short-reach data-center deployments |
| Fiber Type | Parallel single-mode OS2 | DR8 or DR8-2 | MPO-16/APC or dual MPO-12/APC | 500 m to 2 km parallel-fiber links and breakout-heavy designs |
| Fiber Type | Duplex single-mode OS2 | 2 × FR4, 2 × LR4, ZR or ZR+ | Duplex LC or dual duplex LC | WDM, campus, DCI and transport applications |
| Connector Type | MPO-16/APC | DR8 | Sixteen parallel SMF fibers | Direct 800G links and high-density breakout |
| Connector Type | Dual MPO-12/APC | Selected DR8, SR8 and 2 × DR4 implementations | Two independent eight-fiber optical interfaces | Dual-400G connections and modular cabling systems |
| Connector Type | Dual Duplex LC | 800G 2 × FR4 or 2 × LR4 | Two separate duplex SMF pairs | Two independent 400G WDM connections |
| Optical Technology | 8 × 100G PAM4 parallel optics | DR8 and SR8 | MPO parallel-fiber interface | Lowest-complexity 800G data-center links |
| Optical Technology | Dual 400G WDM engines | 2 × FR4 or 2 × LR4 | Dual duplex LC | Reuse of duplex-fiber infrastructure |
| Optical Technology | Coherent DWDM | 800ZR and 800G ZR+ | Duplex LC with DWDM line system | Metro, DCI and regional transport |
| Breakout Capability | 800G to 2 × 400G | DR8 to two DR4 interfaces | MPO-16/APC to two MPO-12/APC assemblies | Connecting an 800G spine port to two 400G devices |
| Breakout Capability | 800G to 4 × 200G | DR8 to four DR2 interfaces | MPO-16/APC breakout assembly | High-density NIC and accelerator connectivity |
| Breakout Capability | 800G to 8 × 100G | DR8 to eight DR1 interfaces | MPO-16/APC to eight duplex-LC connections | Connecting an 800G switch port to eight 100G endpoints |
| Power and Thermal | Maximum 14 W | DR8-M16 | Host must support the applicable QSFP-DD power class and airflow | High-density 800G switching environments |
| Power and Thermal | Higher thermal budget | WDM and coherent 800G optics | Platform-specific cooling and power requirements | Longer-distance and coherent applications |
Applications
Deployment scenarios for this module
Data Center & Enterprise Networks
High-speed connectivity for leaf-spine architectures, server aggregation, and backbone upgrades supporting growing east-west traffic.
Telecom & Service Provider Transport
Robust optical connectivity for aggregation, metro, and long-haul transport across carrier and service provider networks.
Cloud, AI & Hyperscale Infrastructure
Reliable, low-latency links designed for high-performance computing, AI workloads, and scalable cloud environments.
Quality Certification
At E.C.I. NETWORKS, all our optical transceivers are CE, FCC, RoHS, and FDA laser compliant, meeting global standards for safety, environmental responsibility, and electromagnetic performance.
Key Certifications
Emissions & immunity compliance for IT and multimedia equipment.
Verified as unintentional radiators with SDoC available.
Safety-certified and laser-classified (Class 1).
U.S. laser safety regulations.
Free from hazardous substances and environmentally responsible.
Available on selected models per regional or customer needs.
Compliance Standards
These certifications ensure our transceivers are safe, interoperable, and built to meet the highest global compliance standards across data center, telecom, and enterprise environments.
Conflict-Free Sourcing
We comply with the SEC Conflict Minerals Rule, supporting ethical sourcing practices for minerals like tantalum, tin, tungsten, and gold.
Quality Certification
At E.C.I. NETWORKS, all our optical transceivers are CE, FCC, RoHS, and FDA laser compliant, meeting global standards for safety, environmental responsibility, and electromagnetic performance.
Key Certifications
Emissions & immunity compliance for IT and multimedia equipment.
Verified as unintentional radiators with SDoC available.
Safety-certified and laser-classified (Class 1).
U.S. laser safety regulations.
Free from hazardous substances and environmentally responsible.
Available on selected models per regional or customer needs.
Compliance Standards
These certifications ensure our transceivers are safe, interoperable, and built to meet the highest global compliance standards across data center, telecom, and enterprise environments.
Conflict-Free Sourcing
We comply with the SEC Conflict Minerals Rule, supporting ethical sourcing practices for minerals like tantalum, tin, tungsten, and gold.
Performance & Reliability
We ensure our optical transceivers deliver exceptional performance and long-term reliability through rigorous testing on industry-leading equipment.
Power & Wavelength Testing
We verify signal strength and wavelength stability to ensure seamless decoding and consistent transmission across the optical path.
Traffic Testing
All transceivers undergo bit error rate (BER) and packet loss testing to guarantee zero data loss and full compliance with Ethernet and Fibre Channel standards.
Optical Performance Validation
Our modules are evaluated for signal integrity, eye diagram clarity, and BER, ensuring stable, high-quality optical transmission in all operating conditions.
End Face Inspection
Each module's fiber interface is inspected and cleaned to eliminate contamination and physical defects -- a critical step for optimal signal performance and long service life.
Warranty & Compatibility
Optical Transceivers (1G–400G): Lifetime (5 Years)
Zero Risk
Using our transceivers does not void the warranty of your network equipment. Global OEM policies and consumer protection laws (like the Magnuson-Moss Warranty Act) prevent manufacturers from denying support based solely on the use of third-party components.
Guaranteed Compatibility
Our modules are coded and tested for seamless operation across major platforms including Cisco, Arista, Juniper, HPE, Nvidia, Huawei, and more. This rigorous validation ensures plug-and-play reliability and full compliance with OEM specifications.
Technical Support & RMA
Have an issue? We provide full technical support and hassle-free RMA on all eligible transceivers. Our team is ready to help with any technical questions about compatibility or deployment. contact our technical support: support@ecin.ca
Q&A
Commonly asked questions
No. Under the Magnuson-Moss Warranty Act and similar global consumer protection laws, OEMs cannot void your equipment warranty simply because you use a third-party transceiver. Your equipment warranty remains intact.
Yes. Our modules can be coded for major OEM platforms (Cisco, Juniper, Arista, Nvidia, etc.) and support open networking environments including SONiC.
A compatible generic version can be provided and coded before delivery.
Common 400G QSFP-DD optic types include DR4 for parallel single-mode fiber up to 500m, FR4 for duplex single-mode fiber up to ~2km, LR4 for duplex single-mode fiber up to ~10km, short-reach multimode options such as SR8 / SR4.2, and extended/coherent options such as ZR / ZR+ for longer DCI and metro applications. The attached datasheet specifically covers the EN-QDD-DR4, a 400GBASE-DR4 QSFP-DD module using 4 parallel optical lanes, 1310nm wavelength, MTP/MPO-12 APC connector, and up to 500m transmission over single-mode fiber with FEC.
Choose the 800G QSFP-DD transceiver according to the required distance and installed fiber infrastructure. DR8 is best for data-center links up to 500 m and uses parallel single-mode fiber with an MPO-16/APC connector. 2×400G FR4 supports distances up to 2 km over two duplex single-mode fiber pairs, making it suitable for aggregation and short data-center interconnects. 2×400G LR4 extends the reach to 10 km over duplex single-mode fiber for campus, inter-building, and metro-access applications. FR4 and LR4 connector configurations may use dual LC or dual CS interfaces, depending on the module. Always verify the host platform’s breakout modes, connector type, FEC configuration, power budget, and QSFP-DD800 compatibility before deployment.
Yes. Our modules are coded for the specific platform you select at purchase. They are recognized natively by the switch OS without any additional configuration or commands.
No, E.C.I. NETWORKS 400G transceivers are designed to meet applicable IEEE and MSA specifications, deliver the required 400G data rate and optical reach for their optic class, and support standards-based monitoring such as DDM/DOM. Actual link performance depends on choosing the right 400G type, such as DR4, FR4, LR4, SR8, or ZR/ZR+, and matching it to the correct cabling, optical budget, switch compatibility, and thermal environment.
Yes. We offer full support, RMA service, and warranty coverage on all modules.
Resources
Downloads and documentation