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What Is the Cisco QDD400GBRT-15-BUN?
The Cisco QDD400GBRT-15-BUN is a 400G QSFP-DD (Quad Small Form-Factor Pluggable Double Density) optical transceiver bundle designed for high-performance data center and enterprise networks. This 15-unit package provides a cost-effective solution for large-scale deployments, supporting 400Gbps full-duplex connectivity over single-mode fiber (SMF) with a reach of up to 2 kilometers. It leverages PAM4 modulation and dual-wavelength bidirectional (BiDi) technology to maximize spectral efficiency in dense network architectures.
Key features include:
- 2km Reach: Ideal for metro data center interconnects (DCI) and campus backbones.
- Hot-Swappable Design: Enables zero-downtime upgrades in Cisco Nexus® and Catalyst® platforms.
- Cisco Validated Design (CVD): Guaranteed interoperability with Cisco switches and routers.
Technical Specifications and Compatibility
The QDD400GBRT-15-BUN is engineered for high-density, low-latency environments. Below are its critical specifications:
| Parameter | Value |
|---|---|
| Form Factor | QSFP-DD |
| Wavelength | 1310 nm (Tx) / 1270 nm (Rx) |
| Data Rate | 400Gbps (4x100G PAM4) |
| Power Consumption | ≤14W per transceiver |
| Operating Temperature | 0°C to 70°C (32°F to 158°F) |
| Fiber Type | OS2 single-mode |
Compatible Platforms:
- Cisco Nexus 9336C-FX2, 9364C-GX
- Cisco Nexus 9500 Series with N9K-X9716D-GX line cards
- Cisco 8200 Series Routers
Primary Use Cases and Deployment Scenarios
1. Hyperscale Data Center Spine-Leaf Architectures
Deploying the QDD400GBRT-15-BUN between spine and leaf layers reduces oversubscription ratios to 1:1, critical for AI/ML workloads requiring non-blocking throughput. For example, a Nexus 9336C-FX2 leaf switch can deliver 14.4Tbps of bidirectional bandwidth using 36x400G ports.
2. Metro and Regional DCI
The transceiver’s 2km reach supports long-haul connections between geographically dispersed data centers, replacing expensive coherent optics for shorter links.
3. High-Frequency Trading (HFT) Networks
With end-to-end latency under 100 nanoseconds, the module ensures sub-millisecond trade execution times between collocated financial data centers.
Installation and Optimization Guidelines
Hardware Preparation
- Fiber Inspection: Clean SMF connectors with a lint-free wipe and inspect using a fiber scope to avoid insertion loss >0.5dB.
- Transceiver Handling: Use an ESD wrist strap when installing to prevent electrostatic discharge damage.
Configuration Best Practices
- FEC Settings: Enable Clause 91 RS-FEC on Cisco NX-OS to mitigate PAM4-induced errors:
plaintext复制
interface Ethernet1/1 fec cl91 - Thermal Management:
- Maintain ambient temperature below 35°C (95°F) for optimal performance.
- Ensure front-to-back airflow in Nexus 9500 chassis to avoid thermal throttling.
Troubleshooting Common Issues
- Link Instability: Verify fiber polarity and replace damaged MPO-12 breakout cables.
- DOM Warnings: Use
show interface transceiver detailsto check for Tx/Rx power anomalies outside -6.3dBm to +2.4dBm.
Why the QDD400GBRT-15-BUN Outperforms Third-Party Modules
While generic 400G transceivers may cost 30–40% less, Cisco’s solution offers unmatched reliability:
- Secure Authentication: Embedded Cisco Unique Device Identifier (UDI) prevents counterfeit module insertion.
- Predictive Analytics: Integrates with Cisco Crosswork Network Automation for proactive health monitoring.
- Global Compliance: Meets RoHS, CE, and FCC standards for international deployments.
For volume discounts and lifecycle support, purchase from authorized partners like “QDD400GBRT-15-BUN” at ITMall.sale.
Field Insights: Balancing Scale and Performance
In a recent deployment for a cloud service provider, the QDD400GBRT-15-BUN reduced port costs by 22% compared to buying individual transceivers. However, the bundle’s 14W per-unit power draw required upgrading power distribution units (PDUs) in legacy racks—a hidden cost that initially surprised the operations team. Contrast this with a financial firm that opted for third-party modules: they saved $150K upfront but faced 12 hours of downtime due to firmware incompatibilities during a Nexus 9300 upgrade. For enterprises where uptime directly impacts revenue, the Cisco bundle isn’t just a product—it’s risk mitigation.