C3KX-NM-10GT Cisco Catalyst 3560-X & 3750-X 10 Gigabit Network Module

Overview of the Network Module

The Cisco C3KX-NM-10GT Network Module is an essential component of the Catalyst 3560-X and 3750-X Series switches. These switches are renowned for their exceptional performance, scalability, and advanced feature set, making them the ideal choice for medium-sized to large enterprise networks.

Main Information

• Brand: Cisco
• Part Number: C3KX-NM-10GT
• Product Type: Network Module

Key Characteristics

• Primary Use: Enhancing Data Network Connectivity
• Interfaces: Two 10GBASE-T LAN Ports
• Port Details: Dual RJ-45 10GBASE-T Network LAN Connectors
• Compatibility: Designed for Cisco Catalyst 3750-X and 3560-X Series Switches
• Dual 10 Gigabit SFP+ ports for high-speed uplinks
• Seamless integration with Catalyst 3560-X and 3750-X series switches
• Support for fiber optic transceivers and DAC cables
• Full duplex 10G throughput per port
• Hot-swappable design for minimal network disruption
• Compatibility with Cisco IOS feature sets

Interface and Connectivity

• 2 x 10GBASE-T LAN ports
• 2 x RJ-45 10GBASE-T network LAN connections

Compatibility Information

• Cisco Catalyst 3750-X Series Switches
• Cisco Catalyst 3560-X Series Switches

The Cisco Catalyst 3560-X & 3750-X 10 Gigabit Network Module 

The C3KX-NM-10GT network module is a high-performance 10 Gigabit Ethernet expansion component designed specifically for the Cisco Catalyst 3560-X and Cisco Catalyst 3750-X switch series developed by It is engineered to provide scalable uplink capabilities, enabling enterprise-grade access layer switches to extend into high-bandwidth aggregation and distribution roles. This module enhances network infrastructure by delivering dual 10G SFP+ ports, supporting modern data-intensive applications and high-speed backbone connectivity in campus and enterprise environments.

As organizations increasingly rely on cloud computing, virtualization, unified communications, and real-time analytics, the demand for higher uplink bandwidth has grown significantly. The C3KX-NM-10GT module addresses these requirements by allowing legacy Catalyst platforms to evolve without full hardware replacement. It serves as a cost-effective upgrade path while maintaining enterprise reliability, security, and operational consistency across network layers.

Architecture and Engineering of the 10 Gigabit Network Module

The architecture of the C3KX-NM-10GT is based on a compact yet powerful design that integrates directly into the network module slot of compatible Catalyst switches. It features two enhanced Small Form-Factor Pluggable Plus (SFP+) interfaces capable of delivering up to 10 Gbps per port. The internal design is optimized for minimal latency packet forwarding, ensuring that traffic between access and distribution layers flows efficiently without bottlenecks. This module is built with hardware-level optimization that supports line-rate forwarding, reducing dependency on CPU-based processing within the switch. By offloading high-speed uplink traffic to dedicated ASIC pathways, the module ensures stable performance even under heavy network utilization scenarios such as large-scale virtualization clusters or high-density wireless deployments.

Thermal efficiency and power management are also key elements of its architecture. The module is designed to operate within the thermal envelope of the Catalyst 3560-X and 3750-X chassis, ensuring stable performance without requiring additional cooling infrastructure. This makes it suitable for dense rack deployments in enterprise data centers and wiring closets.

Compatibility with Cisco Catalyst 3560-X and 3750-X Platforms

The C3KX-NM-10GT module is exclusively compatible with Cisco Catalyst 3560-X and Catalyst 3750-X series switches. These platforms are widely deployed in enterprise campus networks due to their modular flexibility, stacking capabilities, and robust Layer 2 and Layer 3 feature sets. The integration of this module allows these switches to support high-speed uplinks without requiring a full chassis replacement.

When installed, the module seamlessly integrates with the switch operating system, enabling automatic detection and configuration of the SFP+ interfaces. This plug-and-play functionality reduces deployment time and minimizes configuration errors. It also maintains backward compatibility with existing network configurations, making it ideal for incremental upgrades in established infrastructure environments.

10 Gigabit SFP+ Uplink Capabilities and Connectivity Options

One of the most significant features of the C3KX-NM-10GT module is its dual 10 Gigabit SFP+ uplink capability. These ports support a wide range of optical transceivers, including short-range (SR) and long-range (LR) fiber modules, enabling flexible deployment across various distances and network topologies.

The SFP+ interfaces provide high-density connectivity while maintaining low latency and energy efficiency. This allows organizations to build scalable uplink architectures for core-to-distribution or distribution-to-access layers. The ability to use fiber optic connections ensures immunity to electromagnetic interference, making it suitable for industrial and high-interference environments.

Performance and Throughput Optimization

The C3KX-NM-10GT module significantly enhances overall switch throughput by enabling high-speed uplinks that eliminate congestion at aggregation points. In traditional Gigabit uplink environments, traffic bottlenecks often occur when multiple access-layer switches attempt to communicate with core infrastructure simultaneously. This module resolves such constraints by providing 10 times the bandwidth capacity. With support for wire-speed forwarding, the module ensures that packets are processed at full line rate without buffering delays. This is particularly important in environments with heavy east-west traffic, such as virtualization clusters and distributed application architectures.

Additionally, Quality of Service (QoS) mechanisms integrated within the Catalyst switching architecture ensure that critical traffic such as voice, video, and mission-critical data is prioritized effectively. This guarantees consistent application performance even under peak network loads.

Enterprise Use Cases and Deployment Scenarios

The versatility of the C3KX-NM-10GT module makes it suitable for a wide range of enterprise and service provider environments. It is commonly deployed in campus backbone networks, data center edge layers, and high-performance enterprise access switches.

In educational institutions, it supports high-density student access networks where bandwidth demand fluctuates heavily due to digital learning platforms and cloud-based collaboration tools. In healthcare environments, it ensures reliable transmission of large imaging files, electronic health records, and telemedicine applications.

In financial institutions, the module supports low-latency trading systems and secure transaction processing networks. Meanwhile, service providers utilize it to aggregate customer traffic efficiently at edge aggregation points.

Port Density and Expansion Flexibility

Although the module provides only two physical 10G ports, its impact on network expansion is significant. It enables a scalable architecture where multiple access-layer switches can be interconnected using high-speed uplinks, effectively increasing the overall network capacity without requiring additional chassis investment.

This flexibility allows network architects to design hierarchical topologies that can evolve over time. As bandwidth requirements grow, additional modules can be deployed across multiple switches, creating a distributed high-speed backbone across the enterprise environment.

Stacking and Redundancy Integration

The C3KX-NM-10GT module works effectively in environments where Cisco StackWise technology is implemented on Catalyst 3750-X switches. Stacking allows multiple switches to operate as a single logical unit, improving redundancy and simplifying management.

By combining stacking capabilities with 10G uplinks, organizations can achieve both high availability and high performance. Redundant uplink configurations ensure that if one link fails, traffic is automatically rerouted through an alternate path without service disruption.

Network Security and Traffic Integrity Considerations

Security remains a critical aspect of any enterprise network deployment. The C3KX-NM-10GT module supports secure data transmission by integrating with Catalyst security features such as access control lists (ACLs), port security, and secure shell (SSH) management protocols.

When used within a properly configured network environment, the module ensures that high-speed traffic does not compromise security policies. Instead, it enhances visibility and control by enabling consistent enforcement of security rules across all uplink paths.

Comparison with Other Network Expansion Modules

Compared to standard Gigabit Ethernet uplink modules, the C3KX-NM-10GT provides a substantial increase in throughput and scalability. While older modules may support 1G uplinks, they are insufficient for modern enterprise workloads involving cloud applications and virtualization. The 10G capability ensures that the switch remains relevant in high-performance environments where bandwidth demands continue to grow. This makes it a preferred upgrade path for organizations seeking to extend the lifespan of their existing Cisco Catalyst infrastructure.

Optimization for High Traffic Workloads

High traffic environments require careful optimization of uplink capacity, buffering, and QoS policies. The C3KX-NM-10GT module plays a crucial role in ensuring that traffic flows efficiently between network layers without congestion. By distributing traffic across dual 10G uplinks, administrators can balance loads and prevent single-link saturation. This is particularly beneficial in environments with heavy video streaming, large file transfers, or real-time collaboration tools.

Deployment Scenarios Across Industries

In enterprise environments, the module is often deployed as part of a structured hierarchical network design. In manufacturing industries, it supports industrial automation systems that require reliable and high-speed communication between control systems and monitoring platforms. In government networks, it ensures secure and high-performance communication between departments and data centers. In retail environments, it supports point-of-sale systems, inventory management platforms, and customer analytics systems that require continuous connectivity.

The flexibility of the module allows it to adapt to virtually any industry that requires scalable, high-bandwidth network infrastructure while leveraging existing Cisco Catalyst switching platforms.