QDD-400G-FR4 (740-085349) Juniper Compatible 400GBASE-FR4 QSFP-DD Transceiver
Juniper compatible QDD-400G-FR4 - Key Features
- Compatibility: Juniper
- 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
Juniper QDD-400G-FR4 Price
Juniper compatible QDD-400G-FR4 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 |
Juniper compatible QDD-400G-FR4 Datasheet
v2Complete technical specifications and product details
Juniper compatible QDD-400G-FR4 Description
EdgeOptic's QDD-400G-FR4 compatible is a Juniper-coded 400GBASE-FR4 QSFP-DD transceiver, programmed with Juniper-recognized EEPROM so Junos accepts the module on insertion. Same 2 km duplex single-mode reach, same LC/UPC connector, and same optical and electrical envelope as Juniper's original part. The orderable Juniper part number is QDD-400G-FR4; Juniper's HCT also tracks the module under hardware ID 740-085349, the catalog number used on spares and Juniper inventory systems.
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 for 400 Gb/s aggregate. EML transmitters per wavelength channel, PIN photodiode receivers on the inbound side. TX -3.3 to +3.5 dBm per lane, RX sensitivity -7.3 dBm. The 4 dB optical budget supports a 2 km OS2 span with margin for patch panels and splices. Power under 10 W. Full 400GBASE-FR4 specifications cover the rest.
Same part number, two different vendors. Both Juniper and Arista sell a QDD-400G-FR4 under the same literal SKU string. Optically the modules are identical (400GBASE-FR4, IEEE 802.3cu, same wavelength plan), but the EEPROM is vendor-specific. A Juniper-coded module won't pass IDPROM checks on EOS; an Arista-coded module won't pass on Junos. Getting the wrong vendor coding logs an unsupported-transceiver alert and the link stays down. Specify Juniper at order time so the EEPROM image targets Junos.
Junos accepts the Juniper-coded compatible as a recognized transceiver. The standard show interfaces diagnostics optics command exposes per-lane TX and RX optical power, module case temperature, supply voltage, and laser bias current, which helps isolate a specific CWDM wavelength when debugging a degraded link. KP4 RS-FEC (RS(544,514)) is required from the host ASIC at 400G to meet the PAM4 BER target. Verify the QDD-400G-FR4 against Juniper's Hardware Compatibility Tool at apps.juniper.net/hct for your specific platform and Junos release before ordering, since Junos qualification varies by line card and software version.
Conforms to IEEE 802.3cu, 100G Lambda MSA 400G-FR4, QSFP-DD MSA Type 2, and CMIS 4.0. Class 1 laser safe per IEC 60825-1, CE and RoHS certified, commercial temperature 0 to 70 °C. FR4 fits 400G data center interconnect, leaf-spine uplinks above a 100G leaf layer, and DCI hops where the existing single-mode plant already uses LC. Duplex LC patching keeps structured cabling simple, the alternative to MPO-12 parallel optics on DR4. 2 km covers most intra-campus and metro-edge runs.
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 Junos version compatibility questions, contact our sales team.
Frequently Asked Questions
Is the Juniper QDD-400G-FR4 the same module as the Arista QDD-400G-FR4?
Optically yes, electrically no. Both Juniper and Arista publish a QDD-400G-FR4 under the identical literal SKU string, both meet 400GBASE-FR4 (IEEE 802.3cu, 4-channel CWDM, 2 km duplex SMF), and both run PAM4 at 53.125 GBaud per lane. The EEPROM coding is vendor-specific: a Juniper-coded module fails IDPROM on EOS, an Arista-coded module fails on Junos. The two are not interchangeable across vendors. Specify Juniper when ordering from EdgeOptic so the correct EEPROM is programmed at build time.
How can I monitor optical power on the Juniper QDD-400G-FR4?
Use show interfaces diagnostics optics on the relevant QSFP-DD interface. The output covers per-lane TX optical power, RX optical power, laser bias current, module case temperature, and supply voltage. With four CWDM lanes, isolating a single degraded wavelength is straightforward by comparing per-lane RX power against the -7.3 dBm sensitivity floor and the 4 dB link budget. EdgeOptic's Juniper-coded compatible exposes the same DOM data through the same command path used by Juniper-branded optics.