Cisco QDD-400G-LR4-S 10KM Transceiver Module

About Cisco QDD-400G-LR4-S 400G QSFP-DD 10km Transceiver Module in Bangladesh

The Cisco QDD-400G-LR4-S is a 400G QSFP-DD optical transceiver designed for high-speed Ethernet connectivity over single-mode fiber. It supports link distances of up to 10km using a duplex LC connector and four CWDM optical wavelengths.

The module is designed for 400GBASE-LR4 connectivity and uses PAM4 signaling with four optical channels. Cisco specifies wavelengths of 1270nm, 1290nm, 1310nm and 1330nm, with the four wavelengths multiplexed and demultiplexed inside the transceiver. :contentReference[oaicite:2]{index=2}

Cisco QDD-400G-LR4-S 400G Transceiver Specifications & Features

Overview

The Cisco QDD-400G-LR4-S provides 400GbE optical connectivity for modern data center and enterprise network environments. It uses the QSFP-DD form factor and supports transmission distances of up to 10km over single-mode fiber.

Unlike short-reach multimode optics, the QDD-400G-LR4-S is designed for longer-distance optical links using duplex LC-connected SMF, making it suitable for data center interconnects and other extended 400GbE network connections.

Buy Cisco QDD-400G-LR4-S 400G Transceiver in Bangladesh

Purchase the Cisco QDD-400G-LR4-S 400G QSFP-DD 400GBASE-LR4 10km Duplex LC Transceiver Module from Datacom Technologies (BD). We supply Cisco networking equipment, optical transceivers, switches, routers and data center connectivity solutions in Bangladesh with competitive pricing, technical consultation and nationwide delivery.

Key Features

• 400GbE high-speed optical connectivity
• QSFP-DD form factor
• 400GBASE-LR4 optical interface
• Up to 10km transmission distance
• Single-Mode Fiber support
• Duplex LC connector
• Four CWDM optical wavelengths
• 1270nm, 1290nm, 1310nm and 1330nm wavelengths
• PAM4 modulation
• 4 × 100G optical channels
• 400GAUI-8 / CEI-56G-VSR-PAM4 electrical interface
• Suitable for high-density data center networking
• Designed for long-distance 400GbE connectivity

Applications

• 400GbE Data Center Networks
• Data Center Interconnects
• Enterprise Core Networking
• High-Speed Network Aggregation
• Cloud Data Centers
• AI and HPC Infrastructure
• Large-Scale Server Connectivity
• Spine-and-Leaf Network Architectures
• Long-Distance Data Center Links
• 400G Ethernet Infrastructure

400GbE High-Speed Connectivity

The QDD-400G-LR4-S provides 400GbE optical connectivity for high-bandwidth network environments. Its 400G capacity is designed to support modern data center workloads requiring substantial network throughput.

The module uses four optical channels, each carrying approximately 100G, which are multiplexed into a single duplex-fiber connection.

10km Long-Distance Reach

The Cisco QDD-400G-LR4-S supports link distances of up to 10km over single-mode fiber. Cisco specifically states that the module extends the IEEE 400GBASE-LR4-6km requirement to a 10km reach. :contentReference[oaicite:3]{index=3}

This extended reach makes the transceiver suitable for applications where a 400GbE connection must travel substantially farther than typical short-reach data center links.

400GBASE-LR4 Optical Standard

The QDD-400G-LR4-S is designed around the 400GBASE-LR4 optical architecture. Cisco specifies compliance with the 100G Lambda MSA group's 400G-LR4 requirements and compatibility with IEEE 802.3cu 400GBASE-LR4-6km requirements. :contentReference[oaicite:4]{index=4}

The Cisco module extends the supported reach to 10km while maintaining compatibility with the applicable 400G-LR4-6km requirement.

Four CWDM Optical Wavelengths

The QDD-400G-LR4-S uses four CWDM optical wavelengths: 1270nm, 1290nm, 1310nm and 1330nm. Cisco specifies that multiplexing and demultiplexing of these four wavelengths are managed inside the transceiver. :contentReference[oaicite:5]{index=5}

This wavelength architecture allows four optical channels to be carried over the duplex single-mode fiber connection.

Single-Mode Fiber Connectivity

The QDD-400G-LR4-S is designed for single-mode fiber (SMF). Cisco specifies G.652 single-mode fiber for the module's 10km LR4 link. :contentReference[oaicite:6]{index=6}

Using the correct single-mode fiber infrastructure is essential for achieving the specified optical reach and maintaining reliable 400GbE connectivity.

Duplex LC Connector

The module uses a duplex LC optical connector. Cisco's product description explicitly identifies the QDD-400G-LR4-S as a 400G QSFP-DD transceiver with Duplex LC and 10km Duplex SMF connectivity. :contentReference[oaicite:7]{index=7}

Duplex LC connectivity provides two optical paths—one for transmit and one for receive—over the single-mode fiber link.

PAM4 Modulation

The QDD-400G-LR4-S uses PAM4 signaling to achieve the high electrical and optical data rates required for 400GbE networking.

Cisco identifies the module with a 400GAUI-8 / CEI-56G-VSR-PAM4 electrical interface. :contentReference[oaicite:8]{index=8}

QSFP-DD Form Factor

The QDD-400G-LR4-S uses the QSFP-DD form factor, providing a compact optical interface for high-density 400GbE network equipment.

QSFP-DD is designed for high-port-density networking applications, making the form factor suitable for modern data center switches and high-performance networking platforms.

Host FEC

Forward Error Correction is performed on the host platform for the QDD-400G-LR4-S. Cisco specifically notes that FEC is performed on the host platform. :contentReference[oaicite:9]{index=9}

When deploying the module, verify that the target Cisco platform and network configuration provide the required FEC functionality.

Data Center Networking

The QDD-400G-LR4-S is designed for high-bandwidth data center environments where 400GbE connectivity and longer optical reach are required.

• Data center spine networks
• Leaf-spine interconnects
• Data center interconnects
• High-performance computing
• AI infrastructure
• Cloud networking
• Enterprise backbone networks

400G LR4 vs Short-Reach 400G Optics

Compatibility Considerations

The QDD-400G-LR4-S should be installed only in network equipment that supports the Cisco QSFP-DD 400G optical interface and the specific transceiver.

• Compatible Cisco QSFP-DD port
• 400GbE platform support
• 400GBASE-LR4 compatibility
• Single-mode fiber infrastructure
• Duplex LC connectivity
• Required host FEC support
• Compatible optical power budget
• Appropriate Cisco software and firmware support

Always verify the exact Cisco switch or router model and software release before purchasing or installing the optic.

Benefits

• 400GbE high-speed networking
• 10km single-mode fiber reach
• QSFP-DD high-density form factor
• 400GBASE-LR4 architecture
• Duplex LC connectivity
• Four CWDM optical wavelengths
• PAM4 technology
• Suitable for data center interconnects
• Suitable for cloud and enterprise networks
• Ideal for high-bandwidth infrastructure

Why Buy from Datacom Technologies (BD)?

Datacom Technologies (BD) supplies Cisco networking equipment, optical transceivers, switches, routers and data center connectivity products in Bangladesh. Customers can receive competitive pricing, technical consultation, deployment assistance and nationwide delivery.

• Call/WhatsApp: +8801748173213
• Email: sales@datacom.com.bd
• Alternative Email: datacomtechnologiesbd@gmail.com
• Office: Tropical Center, 218, Dr. Kudroti Khuda Road, New Elephant Road, Dhaka-1205, Bangladesh

Frequently Asked Questions (FAQ)

Q1: What is the Cisco QDD-400G-LR4-S?
The Cisco QDD-400G-LR4-S is a 400G QSFP-DD transceiver designed for 400GBASE-LR4 connectivity over single-mode fiber.

Q2: What is the maximum distance?
The QDD-400G-LR4-S supports link distances of up to 10km over single-mode fiber. :contentReference[oaicite:10]{index=10}

Q3: What fiber type does it use?
It uses single-mode fiber (SMF), with Cisco specifying G.652 fiber for the LR4 link. :contentReference[oaicite:11]{index=11}

Q4: What connector does it use?
The module uses a duplex LC optical connector. :contentReference[oaicite:12]{index=12}

Q5: What wavelengths does QDD-400G-LR4-S use?
It uses four CWDM wavelengths: 1270nm, 1290nm, 1310nm and 1330nm. :contentReference[oaicite:13]{index=13}

Q6: What modulation does the module use?
The QDD-400G-LR4-S uses PAM4 signaling.

Q7: What form factor does it use?
It uses the QSFP-DD form factor.

Q8: Is QDD-400G-LR4-S suitable for data centers?
Yes. It is designed for high-speed 400GbE networking and longer-distance single-mode fiber connectivity in data center and enterprise environments.

Q9: Does the module support 400GBASE-LR4?
Yes. Cisco identifies QDD-400G-LR4-S as a 400GBASE-LR4 transceiver and states that it is compliant with the applicable 400GBASE-LR4-6km requirements while extending reach to 10km. :contentReference[oaicite:14]{index=14}

Q10: Is FEC required?
Cisco specifies that FEC is performed on the host platform. :contentReference[oaicite:15]{index=15}

Q11: Can QDD-400G-LR4-S use multimode fiber?
No. The LR4 configuration is designed for single-mode fiber. Multimode fiber should be used only with an optic specifically designed for MMF.

Q12: Is QDD-400G-LR4-S suitable for long-distance 400G links?
Yes. Its 10km SMF reach makes it suitable for longer-distance 400GbE links where short-reach multimode optics are insufficient.

Q13: What is the nominal optical data rate?
Cisco's current datasheet lists the nominal data rate as 425 Gbps for QDD-400G-LR4-S while the Ethernet payload/data rate is 400GbE. :contentReference[oaicite:16]{index=16}

Q14: Where can I buy Cisco QDD-400G-LR4-S in Bangladesh?
You can contact Datacom Technologies (BD) for Cisco optical transceivers, switches, routers and enterprise networking equipment with competitive pricing and nationwide delivery.