Cisco QDD-400G-FR4-S 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
EdgeOptic's QDD-400G-FR4-S compatible is a Cisco-coded 400GBASE-FR4 QSFP-DD transceiver, engineered to drop into Cisco Nexus 9300-GX2, Nexus 9500-EX/FX3, Catalyst 9500X, and Cisco 8000 chassis with no service unsupported-transceiver workaround. Same pinout, same EEPROM format, same optical performance as the original Cisco QDD-400G-FR4-S. The -S suffix is the Cisco-specific identifier on this part number, distinct from the bare QDD-400G-FR4 SKUs that other vendors use under the same FR4 standard.
Four CWDM wavelengths at 1271, 1291, 1311, and 1331 nm, multiplexed onto a single duplex LC pair. PAM4 modulation at 53.125 GBaud per lane delivers 400 Gb/s aggregate, with EML transmitters on each wavelength channel and PIN photodiode receivers on the inbound side. TX power lands between -3.3 and +3.5 dBm per lane, RX sensitivity at -7.3 dBm. The 4 dB optical link budget covers a 2 km OS2 single-mode span with margin for patch panels and splices. Power consumption stays under 10 W. Full 400GBASE-FR4 specifications cover the rest.
EdgeOptic programs Cisco-recognized EEPROM into the QDD-400G-FR4-S compatible, so Nexus and Catalyst platforms accept it natively without the service unsupported-transceiver command. Works on Cisco Nexus 9300-GX2, Nexus 9500-EX and 9500-FX3 line cards, Catalyst 9500X, and Cisco 8000 routers; verify the exact platform and software release against the Cisco Transceiver Module Compatibility Matrix at tmgmatrix.cisco.com. KP4 RS-FEC (RS(544,514)) is mandatory at 400G and is handled by the switch ASIC; verify FEC configuration requirements for your NX-OS release in the Cisco Nexus 9000 configuration guide.
Typical deployment: Cisco leaf-spine fabrics with 400G uplinks from top-of-rack Nexus 9300-GX2 to spine-layer Nexus 9500. FR4 carries inter-row and intra-building runs up to 2 km over existing OS2 plant. Standard duplex LC patching keeps structured cabling simple, the alternative to MPO-12 parallel fiber on DR4 modules in plants already wired with single-mode duplex. Power planning matters at density: each QSFP-DD draws up to 10 W. On a fully populated Nexus 9300-GX2 with 36 QSFP-DD ports, aggregate optics draw warrants checking against the chassis budget.
Conforms to IEEE 802.3cu, 100G Lambda MSA 400G-FR4, QSFP-DD MSA, and CMIS 4.0. CMIS exposes per-lane TX and RX optical power, module case temperature, supply voltage, and laser bias current over standard I2C, so DOM polling integrates with NX-OS show commands and existing chassis monitoring at the per-lane level. Class 1 laser safe per IEC 60825-1, CE and RoHS certified, commercial temperature 0 to 70 °C.
Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms. Made to order with a 2-week lead time and lifetime warranty included. For volume pricing or platform-specific configuration 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 codes the EEPROM with Cisco-recognized vendor identifiers, so Nexus 9000 and Catalyst 9500X chassis accept the module natively at insertion. The service unsupported-transceiver workaround is not required, and no IDPROM warnings appear in the system log on supported platforms.
What does the -S suffix mean on the Cisco QDD-400G-FR4-S?
The -S suffix is Cisco's part-number designator on this SKU, distinguishing it from the bare QDD-400G-FR4 strings that Arista and Juniper use under the same FR4 standard. The precise designation meaning is not publicly documented by Cisco; verify the exact SKU string in the Cisco ordering tool or Cisco Transceiver Module Compatibility Matrix at tmgmatrix.cisco.com for your contract. On some distributor listings the same module also appears as QDD-400G-FR4-S=, which is Cisco's standalone spare-part ordering suffix for the identical physical module.
Does host FEC need to be manually configured when installing the QDD-400G-FR4-S on Nexus 9000?
KP4 RS-FEC (RS(544,514)) is required at 400G and is handled by the switch ASIC, not the module. Verify whether your NX-OS release enables KP4 automatically on QSFP-DD interfaces or requires explicit fec rs-fec interface configuration; check the Cisco Nexus 9000 configuration guide or release notes for your specific image. If the link fails to come up after insertion, the FEC setting on the host port is the first thing to confirm.
Can the QDD-400G-FR4-S be used as a 4x100G breakout on Cisco Nexus?
No. The QDD-400G-FR4-S multiplexes four CWDM wavelengths onto a single duplex fiber pair using LC connectors, so the four lanes are not separable into independent 100G ports. For 4x100G breakout on Nexus the correct module is 400GBASE-DR4 with an MPO connector and parallel single-mode fiber, which keeps each 100G lane on its own fiber pair end-to-end.