QDD-400G-FR4-S Cisco Compatible 400GBASE-FR4 QSFP-DD Transceiver
Cisco compatible QDD-400G-FR4-S - Key Features
- Compatibility: Cisco
- Media Type: Single-Mode Fiber (SMF)
- Connector: Double LC/UPC
- Fiber Count: Duplex
- Maximum Distance: 2 km
- Average Link Budget: 4 dB
- Tx Wavelength: CWDM 4 Ch
- Supported Data Rate: 425 Gbps
- DDM/DOM: Supported
- Forward Error Correction (FEC): Host FEC Supported
- Temperature Range: Standard 0°-70°C
Cisco QDD-400G-FR4-S Price
Cisco compatible QDD-400G-FR4-S Specifications
Form Factor | QSFP-DD |
Modulation | PAM4 (Pulse Amplitude Modulation 4-level) |
Media Type | Single-Mode Fiber (SMF) |
Connector | Double LC/UPC |
Fiber Count | Duplex |
Maximum Distance | 2 km |
Average Link Budget | 4 dB |
TX Wavelength | 4-channel CWDM (1271/1291/1311/1331 nm) |
RX Wavelength | 4-channel CWDM (1271/1291/1311/1331 nm) |
Supported Data Rate | 425 Gbps |
Supported Ethernet Applications | 400G Ethernet (425 Gbps) |
DDM/DOM | Supported |
Forward Error Correction (FEC) | Host FEC Supported |
CDR (Clock and Data Recovery) chip | Supported |
Transmitter Type | EML Laser |
Tx Wave Bandwidth | 73 nm (1264.50–1337.50 nm) |
Average Launch Power (Min) Each Lane | -3.3 dBm |
Average Launch Power (Max) Each Lane | 3.5 dBm |
Extinction Ratio (Min) | 3.5 dB |
Receiver Type | PIN photodiode |
RX Wave Bandwidth | 73 nm (1264.50–1337.50 nm) |
Average Receiver Sensitivity (Min) Each Lane | -7.3 dBm |
Average Receiver Sensitivity (Max) Each Lane | 3.5 dBm |
Receiver Overload | 4.5 dBm |
Temperature Range | Standard 0°-70°C |
Storage Temperature | -40° to 85°C |
Relative Humidity | 5 to 85% |
Power Consumption (Max) | 10 W |
Power | +3.3V single power supply |
Compliance | CE, RoHS, Class 1 FDA and IEC60825-1 Laser Safety Compliant, 100G Lambda MSA, 400GBASE-FR4, IEEE 802.3cu, QSFP-DD MSA |
Cisco compatible QDD-400G-FR4-S Datasheet
v2Complete technical specifications and product details
Cisco compatible QDD-400G-FR4-S Description
QDD-400G-FR4-S is a Cisco part number for a 400GBASE-FR4 QSFP-DD -- 400G over 2 km single-mode fiber, built for Nexus 9300-GX2, Nexus 9500-EX/FX3, Catalyst 9500X, and Cisco 8000 chassis. EdgeOptic's compatible matches the original module's optical and electrical specs exactly. Same pinout, same EEPROM format, same optical performance.
Four CWDM wavelengths -- 1271, 1291, 1311, 1331 nm -- PAM4 at 106.25 Gbps per lane, 400G aggregate. LC duplex into OS2 single-mode, 2 km max. 4.0 dB optical budget, TX -3.3 to +3.5 dBm, RX sensitivity -7.3 dBm. Power consumption under 11W. EML transmitters on all four wavelength channels, PIN photodiode receivers on the receive side. Full 400GBASE-FR4 specifications cover the rest.
EdgeOptic programs Cisco-recognized EEPROM into this compatible, so Nexus and Catalyst accept it natively -- no "service unsupported-transceiver" needed. Validated on Nexus 9300-GX2, Nexus 9500-EX/FX3, Catalyst 9500X, and Cisco 8000 routers. KP4 FEC (RS(544,514)) is mandatory at 400G. Current NX-OS versions enable it automatically on QSFP-DD 400G interfaces, but verify both endpoints match during commissioning.
Typical deployment: Cisco leaf-spine fabrics, 400G uplinks from top-of-rack Nexus 9300-GX2 to spine-layer Nexus 9500. FR4 handles inter-row and intra-building runs up to 2 km over existing OS2 plant. FR4 uses standard LC duplex patching instead of MPO-12 parallel fiber, which simplifies structured cabling in any environment already wired with duplex single-mode. Power budget consideration: each QSFP-DD draws up to 11W per port. Account for total populated port count before filling every slot -- on a fully loaded Nexus 9300-GX2 with 36 QSFP-DD ports, aggregate power draw is significant.
IEEE 802.3cu-2021, 100G Lambda MSA 400G-FR4, QSFP-DD MSA, CMIS 4.0 compliant. DOM tracks TX/RX optical power per lane, module temperature, laser bias current, and supply voltage over the standard I2C management interface. Commercial temperature range, 0 to 70 C.
4.0 dB of link budget with only about 1.4 dB consumed on a typical 2 km link (0.2 dB/km fiber attenuation plus ~0.5 dB per LC mated pair) -- that leaves over 2.5 dB of margin for patch panels, splices, and fiber aging. More than sufficient in most data center structured cabling environments. Important: FR4 is single-mode only. Do not use OM3 or OM4 multimode fiber.
Volume pricing or platform questions -- contact our sales team.
Frequently Asked Questions
Does the QDD-400G-FR4-S compatible require the 'service unsupported-transceiver' command on Cisco Nexus?
No. EdgeOptic programs Cisco-recognized EEPROM, so Nexus 9000 and Catalyst 9500X accept it natively. No CLI workaround required.
Does host FEC need to be manually configured when installing the QDD-400G-FR4-S on Nexus 9000?
KP4 FEC (RS(544,514)) is required -- it's handled by the switch ASIC, not the module. Most current NX-OS releases turn it on automatically for 400G QSFP-DD interfaces. If the link stays down after insertion, check the NX-OS version release notes.
Can the QDD-400G-FR4-S be configured as a 4x100G breakout on Cisco Nexus?
No. Cisco docs confirm FR4 doesn't support breakout on Nexus. FR4 multiplexes four CWDM wavelengths across a single fiber pair -- those can't be split into independent 100G ports. 4x100G breakout requires 400GBASE-DR4 with MPO connectors.