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DP-9871-FS= Overview: Bridging the Terabit Gap
The Cisco DP-9871-FS= is a high-density optical aggregation module designed for Catalyst 9800 and Nexus 9000 series platforms, targeting hyperscale data centers and 5G transport networks. Built to handle 400G/800G coherent optics, this module enables seamless convergence of IP and optical layers while reducing operational complexity. Let’s dissect its architecture, use cases, and why it’s critical for operators scaling beyond 25.6T systems.
Core Technical Specifications
- Port capacity: 4x 800G ZR/ZR+ or 8x 400G QSFP-DD interfaces
- Modulation: Dual-polarization 16QAM with FlexCoherent DSP
- Power efficiency: 0.25W per gigabit (35% improvement over prior gen)
- FEC support: OpenZR+ and Cisco Enhanced Hybrid FEC
- Latency: <1 μs per hop with cut-through switching
- Environmental: Operates at -5°C to 70°C with 85% non-condensing humidity
Solving Hyperscale Transport Challenges
Modern data centers face three critical bottlenecks:
- Inter-pod congestion: East-west traffic growth at 40% CAGR
- Power constraints: 51.2T systems consuming 22x more power than 2010 equivalents
- Multi-vendor interoperability: Stranded capacity between IP and optical domains
The DP-9871-FS= addresses these through:
- Coherent pluggables integration: Eliminates standalone transponders, reducing rack space by 60%
- Adaptive baud rate: Scales from 90Gbaud (800G) to 120Gbaud (1.2T) via software
- Cross-domain automation: Cisco Crosswork Network Controller compatibility for unified MPLS/SR/SRv6 provisioning
Key Innovations in Optical Performance
Flexible Channel Spacing
- 75 GHz grid mode: For legacy DWDM line systems
- 37.5 GHz grid mode: Maximizes spectrum efficiency in new installations
- Hitless tuning: <50ms channel shift without service interruption
Precision Timing
- ITU-T G.8273.2 Class C sync: ±30ns accuracy for 5G fronthaul
- PTP boundary clock: Supports 10,000+ timing endpoints per chassis
Security Enhancements
- MACsec over OTN: Layer 2 encryption at line rate
- Optical layer AES-256: Protects against fiber tapping attacks
Deployment Scenarios
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Cloud interconnect hubs:
- 800G ZR+ links between availability zones (120km reach)
- 400G FR4 breakout for intra-campus spine-leaf topologies
-
AI/ML cluster fabrics:
- RDMA over Converged Ethernet (RoCEv2) with <500ns latency
- Adaptive FEC for error rates below 1E-15 in GPU-to-GPU traffic
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Multi-vendor brownfield integration:
- Translates Ciena WaveLogic 5 Extreme signals to Cisco NCS 2000 OTN
- Buffer credits: 2,048 per port for SAN extension
Operational Advantages Over Competitors
- Zero-touch provisioning: Automates lambda bring-up via NETCONF/YANG
- Predictive maintenance: AI-driven analysis of BER trends and laser bias currents
- Multi-layer visibility: Correlates IP/optical metrics in ThousandEyes and Cisco DNA Center
Licensing and Ecosystem Integration
- Subscription model: Pay-as-you-grow for capacity (100G/400G/800G tiers)
- Cisco Silicon One synergy: Shares SDK with Q200/ASIC for consistent policy enforcement
- Third-party validation: Interoperates with Juniper PTX10001-36MR and Nokia FP5 platforms
For guaranteed performance SLAs, [“DP-9871-FS=” is available through (https://itmall.sale/product-category/cisco/), including access to Cisco’s 24/7 Premium Smart Net Total Care.
Final Perspective: The Silent Enabler of AI-Driven Networks
While the DP-9871-FS= lacks the marketing glamour of generative AI tools, it’s the unspoken backbone making such innovations possible. By collapsing optical and packet layers into a single operational domain, this module does more than move bits—it redefines what’s economically feasible in distributed computing. For network architects balancing CapEx pressures against exponential traffic growth, it’s not just another line card—it’s a strategic hedge against obsolescence in the zettabyte era.