QDD-400G-DR4-S – 400G DR4 QSFP-DD – MPO-12 SMF – 500m Reach
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QDD-400G-DR4-S Description
QDD-400G-DR4-S is a Cisco 400G QSFP-DD 400GBASE-DR4 optical transceiver for 400GE links on QSFP-DD ports over parallel single-mode fiber. It uses an MPO-12 SMF APC interface, supports up to 500 m reach on G.652 SMF, carries the 400G signal at a 1310 nm nominal wavelength, supports 4 x 100GE breakout operation under IEEE 802.3 100GBASE-DR, and is specified with 12 W maximum power consumption and host-side FEC.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
QDD-400G-DR4-S |
|
Product type |
400GBASE-DR4 QSFP-DD optical transceiver |
|
Connector and media |
MPO-12 APC over parallel G.652 SMF |
|
Maximum reach |
500 m |
|
Supported Ethernet rate |
400 Gigabit Ethernet |
|
Native link mode |
400GE DR4 |
|
Breakout link mode |
4 x 100GE to supported DR, FR, or LR optics |
|
Optical loss budget |
3 dB |
|
Nominal wavelength |
1310 nm |
|
Nominal data rate |
425 Gbps |
|
High-speed electrical interface |
400GAUI-8/CEI-56G-VSR-PAM4 |
|
FEC location |
Host platform |
|
Maximum power consumption |
12 W |
Application Scenarios
Choose this part for Cisco QSFP-DD 400G ports when the fiber design is already built around MPO-12 APC trunks or cassettes. The SKU keeps the link on a DR4 parallel-fiber path with a 500 m reach limit.
QDD-400G-DR4-S can help when one QSFP-DD port must break out into four 100GE links. The order still needs a supported Cisco host, the right breakout cable map, and far-end 100G optics that fit the documented interoperation table.
Receiving teams should separate this DR4 optic from FR4, LR4, SR4.2, and 4x100G-only modules. The part numbers can look close in a purchasing system, but the connector polish, fiber layout, reach, and remote endpoint rules are different.
Product Comparison
|
Parameter |
QDD-400G-DR4-S |
QDD-4X100G-FR-S |
QDD-400G-SR8-S | |
|---|---|---|---|---|
|
Connector and media |
MPO-12 APC parallel SMF |
MPO-12 APC parallel SMF |
MPO-12 UPC parallel MMF |
MPO-16 APC parallel MMF |
|
Primary link mode |
400GE DR4, with 4 x 100GE breakout support |
4 x 100GBASE-FR1 breakout |
400GE SR4.2, with 4 x 100GE breakout support |
400GE SR8, 8 x 50GE breakout, or 2 x 200GE breakout |
|
Published reach |
500 m |
2 km per 100G lane |
70 m OM3; 100 m OM4; 150 m OM5 |
70 m OM3; 100 m OM4 |
|
Loss budget |
3 dB |
4 dB |
1.9 dB |
1.9 dB |
|
Power consumption |
12 W |
12 W |
12 W |
12 W |
- QDD-400G-DR4-S is the parallel single-mode option for 400GE DR4 links and short 4 x 100GE breakout designs.
- QDD-4X100G-FR-S and QDD-4X100G-LR-S keep MPO-12 single-mode cabling but are ordered for dedicated 100G lane breakout reach profiles.
- QDD-400G-SR4.2-BD and QDD-400G-SR8-S move the design to multimode fiber, so they should not replace a DR4 single-mode line item without a fiber-plant change.
- The DR4 order should be checked around connector polish and loss budget first; those two details cause more practical risk than the SKU name itself.
Selection Guide
1. Start with the connector and fiber route
Approve QDD-400G-DR4-S when the cabling path is parallel G.652 SMF with APC MPO-12 connections. A duplex LC path or multimode path requires a different optic family.
2. Confirm whether the port stays 400G or breaks out
For a 400GE link, match the far end to a compatible DR4 endpoint. For 4 x 100GE operation, verify the breakout configuration, cable polarity, and supported 100G optics before the BOM is locked.
3. Treat the 3 dB budget as a hard engineering check
The 500 m reach depends on keeping the optical path inside Cisco’s insertion-loss limit. Patch fields, adapter panels, and cassettes should be reviewed before a shipment date is promised.
4. Tie the purchase to a confirmed Cisco host
Before requesting final Layer23-Switch price and stock confirmation, validate the exact switch, router, line card, QSFP-DD port, and software release in Cisco compatibility documentation.
Ordering Checklist
|
Check Item |
What to Confirm |
Why It Matters |
|---|---|---|
|
Exact Product ID |
QDD-400G-DR4-S |
Prevents substitution with FR4, LR4, SR4.2, SR8, or 4x100G-only parts |
|
Port mode |
Native 400GE DR4 or 4 x 100GE breakout |
Determines the far-end optics and cable map |
|
Fiber route |
Parallel G.652 single-mode fiber |
Matches the documented DR4 media requirement |
|
Connector polish |
MPO-12 APC on the DR4 path |
Avoids a physical mismatch with PC or UPC MPO assemblies |
|
Optical budget |
3 dB maximum supported insertion loss |
Catches high-loss patching before installation |
|
Far-end optic |
400G DR4 peer or supported 100G DR, FR, or LR breakout optics |
Reduces link-up and interoperability risk |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | QDD-400G-DR4-S | Product type | 400GBASE-DR4 QSFP-DD optical transceiver |
| Ordering description | 400G QSFP-DD Transceiver, 400GBASE-DR4, MPO-12 parallel SMF, 500m | Connector and patching | MPO-12 SMF APC; APC MPO patch cords required |
| Fiber path | Parallel G.652 single-mode fiber | Supported Ethernet rate | 400 Gigabit Ethernet |
| Native optical standard | IEEE 802.3 400GBASE-DR4 | Breakout optical standard | IEEE 802.3 100GBASE-DR in breakout operation |
| Breakout support | 4 x 100GE breakout to QSFP28 100G-DR, QSFP-100G-FR, and QSFP-100G-LR for link lengths up to 500 m | Maximum reach | 500 m |
| Maximum supported insertion loss | 3 dB | Nominal wavelength | 1310 nm |
| Nominal data rate | 425 Gbps | High-speed electrical interface | 400GAUI-8/CEI-56G-VSR-PAM4 |
| Optical transmit power per lane | -2.9 to +4 dBm | Optical receive power per lane | -5.9 to +4 dBm |
| FEC location | Host platform | Maximum power consumption | 12 W |
| Operating and storage temperature | 0 to 75 degrees C operating; -40 to 85 degrees C storage | Standard warranty | 5 years |
Get More Information
Need pricing, stock, or shipping details for the QDD-400G-DR4-S ? Layer23-Switch can help you check current availability, lead time, and delivery options for this. Send us the part number, quantity, and destination country via live chat or email sales@layer23-switch.com for a fast quotation.
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