Juniper 400GBASE-DR4 QSFP-DD Transceiver — 500m Single-Mode Fiber

The Juniper 740-085351 is a 400GBASE-DR4 QSFP-DD optical transceiver delivering 400GbE over single-mode fiber up to 500m at 1310nm via MPO-12 connector — the numeric part number equivalent to QDD-400G-DR4, providing the same 400G DR4 SMF capability for Juniper QFX and PTX 400G platforms through Juniper's numeric ordering system.

Key Features

• 400GBASE-DR4 QSFP-DD for 500m 400GbE over OS2 SMF — numeric alternative to QDD-400G-DR4
• 4 x 100G parallel 1310nm lanes via MPO-12 for 400G or 4x100G breakout operation
• QSFP-DD form factor backward compatible with QSFP28 100G modules in QSFP-DD slots
• Juniper numeric part 740-085351 — functionally interchangeable with QDD-400G-DR4
• DDM/DOM support for optical power and health monitoring via Junos OS

Product Specifications

• Part Number: 740-085351
• Manufacturer: Juniper Networks
• Form Factor: QSFP-DD
• Speed: 400GbE (400GBASE-DR4)
• Wavelength: 1310nm (4-lane parallel SMF)
• Connector: MPO-12
• Fiber Type: Single-Mode Fiber (SMF, OS2)

Transceiver & Interface Specifications

• Max Distance: 500m over OS2 SMF
• Data Rate: 4 x 100Gbps parallel lanes
• TX Power: -4.0 to +1.0 dBm per lane
• RX Sensitivity: -9.0 dBm (min per lane)
• Power Consumption: Typically 10W
• DDM/DOM: Yes
• Operating Temperature: 0°C to 70°C (commercial)

Use Cases

• Numeric part number procurement alternative for 400G DR4 SMF capacity on Juniper 400G platforms
• 400GbE data center spine and core links over 500m OS2 SMF on Juniper QFX and PTX
• 4x100G breakout via MPO-12 to LC fan-out for 100G aggregation from 400G QSFP-DD ports
• Multi-supplier 400G transceiver stocking for Juniper 400G environments

Compatibility

• Compatible with Juniper QFX and PTX platforms with QSFP-DD 400G port slots
• Requires OS2 single-mode fiber with MPO-12 connectors
• Fully interchangeable with QDD-400G-DR4 on supported Juniper 400G platforms
• IEEE 802.3bs 400GBASE-DR4 compliant

Frequently Asked Questions

Is the 740-085351 exactly the same as QDD-400G-DR4?

Yes — both are Juniper-genuine 400GBASE-DR4 QSFP-DD transceivers with identical optical and electrical specifications. The 740-085351 numeric designation and QDD-400G-DR4 alphanumeric designation refer to the same transceiver in Juniper's ordering and documentation systems.

What MPO connector type does the 740-085351 use?

The 740-085351 uses an MPO-12 connector — a 12-fiber MPO/MTP connector of which 8 fibers are used (4 TX + 4 RX) for the 4-lane 400GBASE-DR4 parallel SMF transmission. MPO-12 is compatible with standard MPO-12 patch panels and fan-out cables.

Can the 740-085351 operate in a QSFP28 100G slot?

No — QSFP-DD modules cannot be physically inserted into standard QSFP28 ports. However, QSFP28 100G modules are backward compatible with QSFP-DD slots on supported platforms. Always verify your platform's port type before ordering.

The Juniper 740-085351 delivers full 400GBASE-DR4 QSFP-DD performance in the numeric part number format — providing procurement flexibility alongside QDD-400G-DR4 for 400G SMF deployments and 4x100G breakout applications on Juniper QFX and PTX 400G platforms.