Core Functionality and Target Environments

The ​​C9400-LC-48U++=​​ is a high-density line card for Cisco Catalyst 9400 Series modular switches, engineered to support ​​48x 1G/10G Multi-Gigabit Ethernet ports​​ and ​​6x 40G/100G QSFP28 uplinks​​. Designed for environments requiring granular speed flexibility, it caters to legacy application modernization, IoT aggregation, and enterprise campus backbones where mixed-speed device connectivity is critical.

Key Technical Specifications

• ​​Port Configuration​​: 48x 1G/10G downlinks (RJ45/SFP+) + 6x 40G/100G uplinks (breakout capable to 24x10G/25G).
• ​​Performance​​: Supports ​​960 Gbps per-slot throughput​​ with Cisco StackWise-480, enabling lossless traffic across stacked chassis.
• ​​Advanced Features​​: Integrated with ​​Cisco DNA Software​​ for automated policy enforcement and ​​Cisco ThousandEyes​​ for SaaS performance monitoring.

This line card is ideal for enterprises transitioning from 1G to multi-gig infrastructures while preserving investments in legacy devices.

Addressing Critical User Concerns

​​Q: Is the C9400-LC-48U++= compatible with PoE+ devices?​​
A: No. For PoE+ support, consider the ​​C9400-LC-48FP​​ variant. This model prioritizes multi-speed data connectivity over power delivery.

​​Q: What supervisor engine is required?​​
A: It requires ​​C9400-SUP-1XL​​ or newer supervisors to leverage full throughput. Older engines (e.g., SUP-1) may bottleneck uplink traffic.

Performance Comparison with Competing Models

• ​​C9400-LC-48HX=​​: Offers 48x25G downlinks but lacks 1G/10G RJ45 ports, making the 48U++= better suited for mixed-speed campuses.
• ​​C9400-LC-24XS++=​​: Focuses on 25G/100G density but sacrifices port count, limiting legacy device support.

The LC-48U++= strikes a balance for enterprises needing ​​broad device compatibility​​ without sacrificing uplink scalability.

Sourcing and Deployment Recommendations

For authentic hardware and lifecycle support, procure the [“C9400-LC-48U++=” link to (https://itmall.sale/product-category/cisco/). Ensure chassis firmware is updated to ​​IOS XE 17.9.1+​​ to activate features like dynamic buffer management.

Authoritative Perspective

The C9400-LC-48U++= is a testament to Cisco’s understanding of real-world network heterogeneity. While hyperscale 25G/100G deployments dominate headlines, many enterprises remain shackled to legacy devices. This line card bridges that gap, offering a pragmatic path to modernization. In my experience, its true value lies in reducing forklift upgrades—enabling CFOs and network architects to align budgets with phased transitions. For organizations juggling yesterday’s investments and tomorrow’s ambitions, it’s an unsung hero in the Catalyst 9400 arsenal.