About Cisco QDD-400G-SR8-S 400G QSFP-DD MPO-16 APC MMF Transceiver Module in Bangladesh
The Cisco QDD-400G-SR8-S is a high-speed 400Gbps QSFP-DD optical transceiver designed for high-density data center and enterprise networking environments. It uses parallel multimode fiber with an MPO-16 APC connector and supports link lengths of up to 100 meters over OM4 multimode fiber.
The QDD-400G-SR8-S supports 400 Gigabit Ethernet connectivity and can also be deployed in breakout configurations for 2 x 200G-SR4 or 8 x 50G-SR connections. Cisco specifies 850nm optical operation and 400GAUI-8 / CEI-56G-VSR-PAM4 electrical signaling for the module. Cisco documentation
Cisco QDD-400G-SR8-S 400G Transceiver Specifications & Features
| Specification | Details |
|---|
| Brand | Cisco |
| Part Number | QDD-400G-SR8-S |
| Data Rate | 400Gbps |
| Form Factor | QSFP-DD |
| Optical Standard | 400GBASE-SR8 |
| Wavelength | 850nm |
| Fiber Type | Multimode Fiber (MMF) |
| Connector | MPO-16 APC |
| Maximum Reach | 100m over OM4 MMF |
| OM3 Reach | 70m |
| OM5 Reach | 100m |
| Breakout Support | 2 x 200G-SR4 or 8 x 50G-SR |
| Electrical Interface | 400GAUI-8 / CEI-56G-VSR-PAM4 |
| Maximum Power Consumption | 12W |
| FEC | Performed on host platform |
Overview
The Cisco QDD-400G-SR8-S provides 400Gbps Ethernet connectivity for high-bandwidth networking environments. Its QSFP-DD form factor is designed for high-density switch and router platforms where large amounts of network traffic need to be transported through compact optical interfaces.
The module uses eight parallel multimode fiber pairs and operates around 850nm. Cisco specifies a maximum link length of 100 meters over OM4 multimode fiber and 70 meters over OM3 fiber. Cisco 400G QSFP-DD documentation
Buy Cisco QDD-400G-SR8-S 400G Transceiver in Bangladesh
Purchase the Cisco QDD-400G-SR8-S 400G QSFP-DD SR8 Transceiver Module from Datacom Technologies (BD). We supply Cisco optical transceivers, QSFP/QSFP-DD modules, data center networking hardware, switches, routers and high-speed optical connectivity solutions in Bangladesh with competitive pricing and technical consultation.
Key Features
- 400Gbps high-speed Ethernet connectivity
- QSFP-DD form factor
- 400GBASE-SR8 optical architecture
- 850nm wavelength
- Multimode Fiber (MMF)
- MPO-16 APC optical connector
- Up to 100m reach over OM4 MMF
- Up to 70m reach over OM3 MMF
- Up to 100m reach over OM5 MMF
- Supports 2 x 200G-SR4 breakout
- Supports 8 x 50G-SR breakout
- 400GAUI-8 electrical interface
- CEI-56G-VSR-PAM4 support
- Maximum power consumption of 12W
- Designed for high-density data center networking
Applications
- 400G Data Center Networking
- High-Speed Switch Uplinks
- Core Network Infrastructure
- Data Center Spine Networks
- Leaf-Spine Architectures
- High-Performance Computing
- Cloud Infrastructure
- AI and Machine Learning Networks
- Network Aggregation
- 400G Ethernet Interconnects
- 200G Breakout Connectivity
- 50G Breakout Connectivity
400Gbps Ethernet Connectivity
The QDD-400G-SR8-S is designed to provide a single 400Gbps optical Ethernet connection. This high bandwidth makes it suitable for modern data centers handling large east-west traffic volumes between switches, servers, storage systems and compute clusters.
400G networking can significantly increase aggregate bandwidth while helping organizations maintain high port density in data center switching environments.
400GBASE-SR8 Optical Technology
The QDD-400G-SR8-S uses a parallel multimode optical architecture. Cisco specifies eight parallel fiber pairs carrying 50Gbps signals per fiber, providing the aggregate 400Gbps Ethernet data rate.
The module operates at approximately 850nm and is intended for short-reach multimode fiber data center applications. Cisco optical specifications
MPO-16 APC Connector
The QDD-400G-SR8-S uses an MPO-16 APC optical connector. The APC connector configuration is important when selecting the appropriate fiber patch cord or trunk assembly.
Cisco specifically states that the QDD-400G-SR8-S requires MPO-16 APC patch cords for MMF connections. Using the correct connector polish and fiber configuration is essential for reliable optical performance. Cisco documentation
100m OM4 Multimode Fiber Reach
The QDD-400G-SR8-S supports link distances of up to 100 meters over OM4 multimode fiber. Cisco also specifies up to 70 meters over OM3 and up to 100 meters over OM5 multimode fiber.
| Fiber Type | Maximum Reach |
|---|
| OM3 MMF | 70m |
| OM4 MMF | 100m |
| OM5 MMF | 100m |
Actual optical reach depends on the complete fiber link, connector quality, insertion loss and the installed optical infrastructure. :contentReference[oaicite:2]{index=2}
400G to 200G Breakout
The QDD-400G-SR8-S can be used for 2 x 200G-SR4 breakout. This allows a 400G QSFP-DD port to provide two separate 200G optical connections when the host platform and breakout configuration support the operation.
Cisco identifies the QDD-400G-SR8-S as supporting breakout to two QSFP-200G-SR4-S modules. :contentReference[oaicite:3]{index=3}
400G to 50G Breakout
The module also supports 8 x 50G-SR breakout. This allows a single 400G optical interface to be divided into eight 50GbE connections using compatible Cisco SFP56-50G-SR modules and the appropriate MPO-16 breakout infrastructure.
This breakout capability can be useful when connecting high-capacity aggregation or spine ports to multiple 50GbE server or network interfaces. :contentReference[oaicite:4]{index=4}
400GAUI-8 Electrical Interface
The QDD-400G-SR8-S uses a 400GAUI-8 electrical interface and supports CEI-56G-VSR-PAM4 signaling. Cisco specifies the module with a nominal data rate of approximately 425Gbps at the optical module interface to support the 400GbE application.
FEC is performed on the host platform rather than within the optical module. :contentReference[oaicite:5]{index=5}
12W Maximum Power Consumption
Cisco specifies a maximum power consumption of 12W for the QDD-400G-SR8-S. Network operators should ensure that the target switch or router provides adequate power and thermal capacity for the installed QSFP-DD module. :contentReference[oaicite:6]{index=6}
High-Density Data Center Networking
The QDD-400G-SR8-S is designed for high-density networking environments where 400Gbps links are required within relatively short physical distances.
Typical applications include data center spine-and-leaf networks, switch uplinks, aggregation links, high-performance computing clusters, AI infrastructure and cloud networking environments.
Data Center Spine and Leaf Networks
400G optical links are increasingly used in spine-and-leaf data center architectures to provide high-bandwidth connectivity between network layers.
The short-reach multimode design of the QDD-400G-SR8-S makes it particularly appropriate for intra-data-center connections where fiber distances remain within the module's supported reach.
AI and High-Performance Computing Networks
AI clusters, GPU infrastructure and high-performance computing environments can generate extremely high volumes of east-west traffic. 400G networking provides the bandwidth required to connect high-performance compute and switching infrastructure.
The QDD-400G-SR8-S can also support breakout architectures, allowing network designers to connect a high-speed 400G port to multiple lower-speed interfaces where supported by the network platform.
Cisco Platform Compatibility
Cisco states that its QSFP-DD modules are supported on Cisco switches and routers. Exact compatibility depends on the specific Cisco platform, software release, port type and transceiver support matrix. Cisco Transceiver Modules documentation
Always verify the exact switch or router model and software version before purchasing or deploying the QDD-400G-SR8-S.
Fiber Compatibility Considerations
The QDD-400G-SR8-S is designed for multimode fiber and should not be confused with Cisco's single-mode 400G modules such as DR4, FR4 or LR4.
- Use compatible MMF infrastructure
- Use MPO-16 APC connectors
- Use appropriate OM3, OM4 or OM5 fiber
- Observe the supported distance for the selected fiber type
- Verify connector polarity and lane mapping
- Confirm host-platform breakout support
QDD-400G-SR8-S vs 400G-LR4
| Feature |
QDD-400G-SR8-S |
Typical 400G-LR4 |
| Data Rate |
400Gbps |
400Gbps |
| Fiber Type |
MMF |
SMF |
| Wavelength |
850nm |
CWDM wavelengths |
| Connector |
MPO-16 APC |
Duplex LC |
| Typical Reach |
Up to 100m OM4 |
Up to 10km |
| Primary Use |
Short-reach data center |
Longer-reach data center/interconnect |
Benefits
- 400Gbps high-speed Ethernet
- High-density QSFP-DD form factor
- Short-reach multimode fiber connectivity
- 100m reach over OM4 MMF
- MPO-16 APC optical interface
- 2 x 200G breakout capability
- 8 x 50G breakout capability
- Suitable for modern data center architectures
- Suitable for high-performance computing networks
- Supports high-bandwidth AI and cloud infrastructure
Why Buy Cisco QDD-400G-SR8-S from Datacom Technologies (BD)?
Datacom Technologies (BD) supplies Cisco optical transceivers, QSFP/QSFP-DD modules, data center switches, routers and enterprise networking hardware 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-SR8-S?
The Cisco QDD-400G-SR8-S is a 400Gbps QSFP-DD optical transceiver designed for short-reach multimode fiber data center networking.
Q2: What is the data rate?
The module supports 400Gbps Ethernet connectivity.
Q3: What fiber does QDD-400G-SR8-S use?
It uses multimode fiber (MMF).
Q4: What connector does it use?
It uses an MPO-16 APC optical connector.
Q5: What is the maximum reach?
The maximum specified reach is 100 meters over OM4 multimode fiber. OM3 reach is 70 meters and OM5 reach is 100 meters. :contentReference[oaicite:7]{index=7}
Q6: What wavelength does it use?
The QDD-400G-SR8-S operates around 850nm, with Cisco specifying an optical wavelength range of 840-860nm. :contentReference[oaicite:8]{index=8}
Q7: Does QDD-400G-SR8-S support breakout?
Yes. It supports breakout to 2 x 200G-SR4 or 8 x 50G-SR. :contentReference[oaicite:9]{index=9}
Q8: Can it connect to 200G devices?
Yes, when the host platform supports the appropriate breakout configuration. Cisco documents support for breakout to two QSFP-200G-SR4-S modules.
Q9: Can it connect to 50G devices?
Yes. Cisco documents 8 x 50G-SR breakout using compatible SFP56-50G-SR modules and appropriate breakout cabling.
Q10: What is the electrical interface?
The module supports 400GAUI-8 and CEI-56G-VSR-PAM4 electrical signaling. :contentReference[oaicite:10]{index=10}
Q11: What is the maximum power consumption?
Cisco specifies maximum power consumption of 12W. :contentReference[oaicite:11]{index=11}
Q12: Does the module require APC fiber?
Yes. Cisco specifically specifies MPO-16 APC for the QDD-400G-SR8-S. :contentReference[oaicite:12]{index=12}
Q13: Is QDD-400G-SR8-S suitable for single-mode fiber?
No. It is a multimode-fiber SR8 module. Single-mode applications should use an appropriate Cisco 400G SMF transceiver such as a DR4, FR4 or LR4 variant.
Q14: Is QDD-400G-SR8-S suitable for long-distance links?
It is designed for short-reach data center links, with a maximum specified reach of 100 meters over OM4 MMF. For kilometer-scale links, an appropriate single-mode 400G module should be selected.
Q15: Where can I buy Cisco QDD-400G-SR8-S in Bangladesh?
You can contact Datacom Technologies (BD) for Cisco 400G optical transceivers, QSFP-DD modules, networking equipment and data center hardware with competitive pricing and nationwide delivery.
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