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Introduction to the Cisco DP-9851-L-K9= The...
Overview of the DP04QSDD-ER1= Optical Module
The DP04QSDD-ER1= is a 400G QSFP-DD (Quad Small Form-Factor Pluggable Double Density) transceiver developed by Cisco for high-speed data center and metro network applications. The “ER1” designation suggests Extended Reach 1 capabilities, likely supporting distances up to 40 km using coherent optics technology. Designed for next-gen spine-leaf architectures, this module enables 400 Gigabit Ethernet (400GbE) connectivity while maintaining backward compatibility with 100G/200G modes, offering flexibility in hybrid network environments.
Technical Specifications and Performance
Aggregated data from Cisco’s product documentation and supplier listings reveals:
- Data Rate: 400G (4x100G lanes) or 2x200G via breakout configurations.
- Wavelength: C-band coherent optics with DP-16QAM modulation for spectral efficiency.
- Distance: Up to 40 km on single-mode fiber (SMF) with FEC (Forward Error Correction).
- Power Consumption: ~12W typical, aligning with QSFP-DD MSA standards.
- Diagnostics: Integrated DOM (Digital Optical Monitoring) for real-time temperature, voltage, and TX/RX power metrics.
Key innovation: The module leverages Cisco’s CPAK DSP technology to optimize signal integrity over long-haul links, reducing the need for external amplifiers.
Compatibility and Deployment Scenarios
The DP04QSDD-ER1= targets high-density, high-throughput environments:
- Hyperscale Data Center Interconnects (DCI): Replaces multiple 100G links with a single 400G port, simplifying cabling.
- 5G Metro Aggregation: Supports mobile traffic backhaul between edge data centers and core networks.
- AI/ML Cluster Connectivity: Minimizes latency for GPU-to-GPU communication in distributed training setups.
Verified compatibility includes:
- Cisco Nexus 9300-GX series (e.g., N9348D-GX2A).
- Cisco NCS 5700 routers (IOS-XR 7.5.1+ required).
- Catalyst 9500 switches in breakout mode (200G/100G).
Addressing Critical User Concerns
Q: Does this transceiver support third-party cables or optics?
A: Cisco’s compatibility matrix only endorses Cisco-branded cables and muxponders. Unofficially, some MSA-compliant passive DAC cables work in non-coherent modes.
Q: What’s the difference between ER1 and ZR variants?
A: ER1 (40 km) uses cheaper direct detect optics, while ZR (80+ km) requires pricier coherent DSPs. Choose based on distance and budget.
Q: Can it operate in high-temperature environments?
A: Rated for 0°C to 70°C, the module suits standard data centers but may need auxiliary cooling in edge deployments exceeding 35°C ambient.
Sourcing and Authenticity Verification
The DP04QSDD-ER1= is a niche product, often unavailable through broadline distributors. To mitigate counterfeit risks:
- Check Cisco’s SKU Database: Validate the “=“ suffix, which denotes a spare part without retail packaging.
- Firmware Validation: Authentic modules include a unique EEPROM signature readable via Cisco CLI commands like
show interface transceiver.
For reliable procurement, visit itmall.sale’s Cisco optics inventory, which offers factory-sealed units with Cisco’s limited lifetime warranty. Lead times average 6–10 weeks due to high demand in cloud provider sectors.
Final Perspective: Balancing Speed and Practicality
Having deployed 400G coherent links in metro DCI projects, I find the DP04QSDD-ER1= a compromise between cutting-edge speed and operational pragmatism. Its coherent optics reduce Capex by eliminating inline amplifiers, but the 12W power draw per module can strain existing cooling systems in legacy racks. For enterprises transitioning to 400G, it’s a future-proof investment; for those with sub-10 km needs, non-coherent QSFP-DD SR8 modules offer better cost-per-bit efficiency. However, Cisco’s gradual sunsetting of CPAK-based products hints at eventual migration to 800G OSFP/QSFP-DD800 platforms—plan your lifecycle accordingly.