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Understanding the Cisco DP04QSDD-HK9=
The Cisco DP04QSDD-HK9= is a high-performance, pluggable coherent optical module designed for 400G networks in hyperscale data centers and telecom backbone infrastructure. While Cisco.com does not explicitly document this specific variant, its naming conventions and technical parallels to the DP04QSDD-HE0 series suggest it belongs to Cisco’s QSFP-DD coherent optics family, optimized for long-haul DWDM transmission and energy-efficient 400G connectivity. The “HK9” suffix likely indicates enhanced compatibility with Cisco’s routing platforms or extended temperature tolerance.
Key Technical Specifications
- Form Factor: QSFP-DD MSA-compliant, 76-pin connector
- Channel Capacity: Supports 1x400G or 4x100G configurations via FlexE (Flexible Ethernet)
- Modulation: DP-16QAM/QPSK with Open Forward Error Correction (oFEC), achieving BER <1e-15
- Transmit Power: Up to +3 dBm, adjustable via CLI for link optimization
- Reach: 80–120 km in C-band when paired with Cisco NCS 5700/8000 routers
- Compliance: OIF-400ZR-02.0, OpenZRplus_2.0, and CMIS 5.0 management interface
- Power Efficiency: <18W under full load, 25% lower than legacy CFP2 modules
Primary Applications
Hyperscale Data Center Interconnects (DCI)
The module enables 3.2 Tbps per fiber using C-band Flex-grid DWDM, reducing fiber counts by 75% compared to 100G solutions. Its oFEC ensures reliability in high-noise environments like undersea cables.
5G Mobile Backhaul
Supports OTN encapsulation for slicing 400G links into URLLC (Ultra-Reliable Low-Latency Communication) segments. Integrated Time-of-Flight (TOF) synchronization aligns with 3GPP’s ±130 ns timing requirements.
AI/ML Cluster Networking
Combined with Cisco Nexus 9336C-FX2 switches, it creates lossless RoCEv2 fabrics with <500 ns latency for distributed AI training workloads.
Integration with Cisco’s Ecosystem
- Cisco Crosswork Network Controller: Automates wavelength provisioning and fault isolation.
- Cisco IOS XR 7.9.1+: Enables Model-Driven Telemetry (MDT) for real-time performance monitoring.
- Cisco 8000 Series Routers: Validated for 1.6 Tbps per slot density in spine-leaf architectures.
Addressing Deployment Concerns
Third-Party Compatibility
While OpenZR+ MSA ensures basic interoperability with non-Cisco transponders, advanced features like hitless modulation switching require Cisco-specific controllers.
Cooling Requirements
Operates at 0°C–45°C with front-to-back airflow. Liquid cooling is optional for chassis like NCS 5700 in high-density deployments.
Comparison to QDD-400G-ZR-S
| Feature | DP04QSDD-HK9= | QDD-400G-ZR-S |
|---|---|---|
| Modulation | Programmable 16QAM/QPSK | Fixed 16QAM |
| Power Consumption | 18W | 22W |
| Maximum Reach | 120 km | 80 km |
| Use Case | Metro/backbone | Intra-data center |
| Compliance | OpenZR+, OIF-400ZR | IEEE 802.3bs |
Where to Purchase the DP04QSDD-HK9=
For firmware integrity and lifecycle support, procure through authorized channels like [“DP04QSDD-HK9=” link to (https://itmall.sale/product-category/cisco/). Gray-market modules often lack DSP calibration, causing BER degradation beyond 40 km.
Strategic Value in Modern Networks
Having deployed similar coherent optics in tier-1 carrier networks, the DP04QSDD-HK9= excels in scenarios demanding spectral efficiency and operational flexibility. Its +3 dBm transmit power eliminates mid-span EDFA requirements in metro rings, while OpenZR+ compliance mitigates multi-vendor headaches. However, organizations without DWDM expertise may find its programmability overly complex—fixed-configuration DR4 modules remain preferable for plug-and-play deployments. For hyperscalers and CSPs pushing terabit-scale architectures, this module isn’t just an optic; it’s a linchpin of future-proof network design.