Juniper QDD-400G-SR4 Transceiver Module

Overview of Juniper QDD-400G-SR4 400GBASE-SR4 QSFP-DD Transceiver

The Juniper QDD-400G-SR4 is a high-speed 400Gbps QSFP-DD optical transceiver designed for short-distance, high-bandwidth network connectivity. It is intended for data-center, high-performance computing, server-to-switch, switch-to-switch, and other 400GbE interconnect applications where high-density optical connectivity is required.

The SR4 architecture uses 850nm multimode optical transmission through an MPO/MTP-12 interface. Compatible implementations can provide up to approximately 100 meters over OM4 multimode fiber, making this type of optic particularly suitable for short-reach data-center connections. Third-party listings for the exact QDD-400G-SR4 identify 850nm, QSFP-DD, MPO-12, PAM4, and 100m OM4 operation. :contentReference[oaicite:1]{index=1}

Juniper's own documentation describes 400G transceivers as QSFP-DD-based modules intended for 400Gbps host interfaces and data-center deployments. Juniper's current Pathfinder catalog, however, lists QDD-400G-SR4P2 as the current 400GBASE-SR4.2/4×100GE BiDi optic, while QDD-400G-SR8 is another current short-reach 400G option. Therefore, the exact SKU and compatibility should be checked before ordering the QDD-400G-SR4. :contentReference[oaicite:2]{index=2}

Why Choose the Juniper QDD-400G-SR4?

• 400Gbps high-speed Ethernet connectivity.
• QSFP-DD pluggable form factor.
• 400GBASE-SR4 short-reach architecture.
• 850nm optical wavelength.
• MPO-12 optical connector.
• Multimode fiber support.
• Up to 100m reach over compatible OM4 fiber.
• PAM4 optical modulation.
• Suitable for high-density data-center deployments.
• Suitable for switch-to-switch and server-to-switch connections.
• DDM/DOM monitoring capability on compatible implementations.

Technical Specifications

*Exact electrical architecture, optical lane implementation, DOM parameters, power consumption, temperature rating and breakout behavior should be confirmed against the supplied Juniper SKU/datasheet. Third-party QDD-400G-SR4 specifications identify 850nm, MPO-12, PAM4, MMF, OM4 up to 100m, DDM and sub-9W maximum power; Juniper's current official catalog instead prominently identifies QDD-400G-SR4P2 as its current SR4.2 optic. :contentReference[oaicite:3]{index=3}

400Gbps High-Speed Connectivity

The QDD-400G-SR4 is designed for 400 Gigabit Ethernet applications. A 400G optical interface provides substantial bandwidth for modern data-center networks, high-performance computing infrastructure, large-scale server clusters, and high-density switching environments.

Juniper describes its 400G transceivers as optical modules capable of handling 400Gbps data rates and specifically identifies data centers and 400G-capable host platforms as key application environments. :contentReference[oaicite:4]{index=4}

400GBASE-SR4 Short-Reach Optics

The SR4 designation indicates a short-reach parallel-optics architecture intended primarily for multimode fiber. The QDD-400G-SR4 uses an 850nm optical interface and is designed for short-distance connections inside data-center environments.

For the exact QDD-400G-SR4 implementation, third-party specifications list a maximum reach of 60m over OM3 and 100m over OM4. :contentReference[oaicite:5]{index=5}

MPO-12 Fiber Interface

The module uses an MPO/MTP-12 connector rather than a conventional duplex LC connector. This allows multiple parallel optical lanes to be carried through a compact high-density fiber interface.

Proper polarity, fiber type, connector quality, and compatible MPO cabling are important when deploying 400G SR4 links.

850nm Multimode Fiber Operation

The QDD-400G-SR4 is intended for 850nm multimode fiber connectivity. OM3 and OM4 multimode cabling are commonly associated with short-reach 400G data-center deployments, with OM4 providing the longer reach available from this type of SR4 optic.

For maximum link distance, fiber quality, connector loss, patch-panel losses, and the specific transceiver's optical budget should all be considered during network design.

PAM4 Modulation

400G SR4 implementations use PAM4 modulation to achieve high data rates over the optical lanes. This technology allows substantially higher bandwidth per lane compared with traditional lower-speed NRZ signaling.

The exact QDD-400G-SR4 implementation is described by third-party specifications as using four 100Gbps optical lanes with PAM4 modulation. :contentReference[oaicite:6]{index=6}

Data Center Applications

The QDD-400G-SR4 is particularly suitable for high-density data-center environments where short-distance 400G links are required.

• 400G Data Center Networks
• High-Performance Computing
• Switch-to-Switch Interconnects
• Server-to-Switch Connectivity
• Data Center Spine Networks
• Leaf-Spine Network Infrastructure
• High-Speed Storage Networks
• AI / GPU Cluster Networking
• Cloud Infrastructure
• High-Bandwidth Network Aggregation

400G to 4×100G Breakout

Depending on the host platform and supported optic configuration, 400G QSFP-DD optics can be used in breakout architectures. Juniper's current QDD-400G-SR4P2 is explicitly listed as breakout capable and supports 4×100GE operation. :contentReference[oaicite:7]{index=7}

For the exact QDD-400G-SR4 SKU, breakout support should be verified against the target Juniper switch, router, line card, and Junos/Junos OS Evolved release before deployment.

Compatibility with Juniper Equipment

Juniper's Pathfinder Hardware Compatibility Tool should be used to verify whether a specific optic is supported on the intended platform and software release.

The current Juniper catalog lists QDD-400G-SR4P2 on platforms including QFX5130-32CD, QFX5130-48CQ, QFX5130-48CM, MX301, MX304, MX10004 and SRX4700. :contentReference[oaicite:8]{index=8}

Because the exact QDD-400G-SR4 SKU is not prominently listed in Juniper's current Pathfinder catalog, buyers should not assume that a third-party compatible QDD-400G-SR4 module is equivalent to the currently listed Juniper QDD-400G-SR4P2.

Benefits of Using the Juniper QDD-400G-SR4

• Provides 400Gbps optical connectivity.
• Designed for short-reach data-center links.
• Supports high-density QSFP-DD infrastructure.
• Uses 850nm multimode optical technology.
• MPO-12 interface simplifies high-density fiber connectivity.
• Suitable for OM3/OM4 multimode fiber environments.
• Ideal for high-bandwidth switch interconnects.
• Suitable for HPC and AI/GPU cluster networking.
• Supports high-density 400G network architectures.

Buy Juniper QDD-400G-SR4 400G Transceiver in Bangladesh

If you're looking for the Juniper QDD-400G-SR4 400GBASE-SR4 QSFP-DD Transceiver Module in Bangladesh, it is intended for short-distance 400GbE optical networking, particularly in data-center and high-performance computing environments.

Its 400Gbps capacity, 850nm wavelength, QSFP-DD form factor, MPO-12 interface and multimode-fiber architecture make it suitable for high-density short-reach network interconnects.

Compatibility note: Juniper's current official Hardware Compatibility Tool lists QDD-400G-SR4P2, part number 740-109152, as the current 400GBASE-SR4.2/4×100GE BiDi optic. The older/exact QDD-400G-SR4 naming is also used by compatible-optic suppliers, so the exact manufacturer part number should be confirmed before purchase. :contentReference[oaicite:9]{index=9}

Why Buy from Independent Tech BD?

• Genuine Networking & Optical Products
• Competitive Price in Bangladesh
• Professional Data Center Solutions
• Corporate & Project Supply
• Technical Support for High-Speed Fiber Deployment
• Nationwide Delivery
• Reliable After-Sales Service

Frequently Asked Questions (FAQ)

What is the speed of the Juniper QDD-400G-SR4?

The QDD-400G-SR4 is a 400Gbps optical transceiver designed for 400 Gigabit Ethernet applications.

What is the wavelength?

The SR4 implementation uses an 850nm optical wavelength. Third-party specifications for the exact QDD-400G-SR4 identify 850nm operation. :contentReference[oaicite:10]{index=10}

What fiber does the QDD-400G-SR4 use?

It is designed for multimode fiber (MMF), with OM3/OM4 commonly used for short-reach 400G SR4 links.

What is the maximum distance?

Third-party specifications for the QDD-400G-SR4 list up to 60m on OM3 and 100m on OM4. :contentReference[oaicite:11]{index=11}

What connector does it use?

The QDD-400G-SR4 uses an MPO/MTP-12 optical connector. :contentReference[oaicite:12]{index=12}

Is the QDD-400G-SR4 a QSFP-DD module?

Yes. Juniper identifies its 400G transceivers as using the QSFP-DD form factor. :contentReference[oaicite:13]{index=13}

Can it be used for 4×100G breakout?

400G SR4 architectures can support 4×100G breakout depending on the exact optic and host platform. Juniper explicitly identifies the newer QDD-400G-SR4P2 as breakout capable. Verify the exact QDD-400G-SR4 SKU and target platform before deployment. :contentReference[oaicite:14]{index=14}

Is QDD-400G-SR4 the same as QDD-400G-SR4P2?

No. They should not be treated as identical SKUs. Juniper's current official catalog identifies QDD-400G-SR4P2 as a 400GBASE-SR4.2/4×100GE BiDi optic, while QDD-400G-SR4 is commonly used for a conventional 400GBASE-SR4 850nm multimode optic. Confirm the exact part number before ordering. :contentReference[oaicite:15]{index=15}