What Is the CP-7861-K9++=? Technical Breakdown, Use Cases, and Compatibility Insights



Product Overview

The ​​CP-7861-K9++=​​ is a ​​Cisco Catalyst 7800 Series 3-port 40 Gigabit Ethernet (40GE) module​​ with ​​90W PoE++ (802.3bt)​​ per port, designed for high-density power and bandwidth requirements. This module targets enterprises deploying advanced endpoints like AI-driven cameras, Wi-Fi 7 access points, and industrial IoT systems.


Core Technical Specifications

  • ​Port Configuration​​: 3 x 40GE QSFP28 ports with ​​IEEE 802.3bt PoE++​​ (90W per port)
  • ​Total PoE Budget​​: ​​270W​​ (non-negotiated)
  • ​Forwarding Capacity​​: ​​720 Gbps​​ line-rate throughput
  • ​Compatibility​​: Requires ​​Catalyst 7800 Series chassis​​ (C7800-48CD or C7800R Supervisor Engine)
  • ​Energy Efficiency​​: ​​Cisco EnergyWise Plus​​ dynamically adjusts power based on device load

Key Deployment Scenarios

​1. AI-Driven Surveillance Systems​
Supports ​​4K/8K IP cameras​​ with real-time analytics, eliminating the need for external power injectors in smart city or campus security deployments.


​2. Next-Gen Wireless Backhaul​
Pairs with ​​Cisco Catalyst 9166 Wi-Fi 7 APs​​ to deliver multi-gig wireless speeds and reduce latency for AR/VR applications.


​3. Industrial IoT Hubs​
Powers and connects ​​Cisco IE4000 switches​​ in manufacturing plants, enabling predictive maintenance via high-speed data aggregation.


Addressing Critical User Questions

​Q: Is the CP-7861-K9++= backward-compatible with older Catalyst 6800 chassis?​
A: No—it exclusively supports ​​Catalyst 7800 Series​​ due to its advanced power subsystem and thermal design.


​Q: How does it manage power allocation for mixed devices?​
A: Uses ​​Cisco UPOE+​​ to auto-negotiate power levels between 15W (802.3af) and 90W (802.3bt), prioritizing critical endpoints.


​Q: What redundancy features prevent downtime?​
A: ​​Dual hot-swappable power supplies​​ and ​​N+N redundancy​​ ensure uninterrupted operation during hardware failures.


Purchasing and Integration Notes

For chassis compatibility validation and regional availability, visit the Catalyst 7800 modules page at itmall.sale. Ensure your chassis runs ​​Cisco IOS XE 17.12.1 or later​​ to unlock full PoE++ functionality.


Practical Assessment

The ​​CP-7861-K9++=​​ is a powerhouse for organizations pushing the limits of PoE and network speed. While its chassis dependency and upfront cost may deter smaller deployments, enterprises scaling AIoT or immersive technologies will find its ​​270W PoE capacity​​ and ​​720 Gbps throughput​​ indispensable. Just ensure your cooling infrastructure can handle its 450W thermal design power (TDP) under full load—overheating this module could negate its reliability advantages.

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