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| Parameter Category | Specification |
|---|---|
| Model Number | QDD-400G-DR4-S |
| Product Type | 400GBASE-DR4 QSFP-DD transceiver for 500 m single-mode links |
| Form Factor | QSFP-DD |
| Data Rate | 400G Ethernet |
| Wavelength | 1310 nm |
| Fiber / Media | Single-mode fiber (SMF) |
| Reach / Length | 500 m |
| Connector | MPO-12 (MTP) |
| Bail Latch Color | Blue |
| Power Consumption | 10 W |
| Operating Temperature | Commercial, 0 to 70 °C |
| Digital Optical Monitoring | — |
| Compatibility | Cisco switches, routers and firewalls with 400G QSFP-DD ports |
| Condition | New Factory Sealed |
| Warranty | 5 years |
| Parameter | QDD-400G-DR4-S | QDD-400G-SR4.2-BD | QDD-400G-FR4-S | QDD-400G-LR4-S |
|---|---|---|---|---|
| Form Factor | QSFP-DD | QSFP-DD | QSFP-DD | QSFP-DD |
| Data Rate | 400G | 400G | 400G | 400G |
| Wavelength | 1310 nm | 850 nm | 1310 nm | 1310 nm |
| Reach / Length | 500 m | 70 m on OM3 / 100 m on OM4 | 2 km | 10 km |
| Connector | MPO-12 (MTP) | MPO-12 (MTP) | Duplex LC/PC | Duplex LC/PC |
| Typical Use | Long haul | In-rack / intra-DC | Long haul | Campus / metro |
The Cisco QDD-400G-DR4-S supports 500 m over Single-mode fiber (SMF), using MPO-12 (MTP) connectors. Confirm the fiber grade and the optical budget of the link before ordering.
The Cisco QDD-400G-DR4-S uses MPO-12 (MTP). MPO/MTP cabling is required — duplex LC patch cords will not fit.
The QDD-400G-DR4-S reaches 500 m over Single-mode fiber (SMF), while the QDD-400G-SR4.2-BD reaches 70 m on OM3 / 100 m on OM4 over Multimode fiber (MMF). Pick the shortest reach that covers the link distance — going longer than needed costs more and adds optical budget margin you will not use.