SF550X-48P-K9-NA Cisco 48 PoE+ Ethernet Ports Layer 3 Managed Switch

Cisco SF550X-48P-K9-NA Layer 3 Managed Switch

The Cisco SF550X-48P-K9-NA is a high-performance Small Business Layer 3 managed switch designed to support scalable, secure, and resilient network infrastructures. Built within the reliable Cisco 550X Series, this switch delivers enterprise-class networking capabilities, advanced routing intelligence, and enhanced Power over Ethernet Plus (PoE+) support. It is engineered to accommodate growing business environments that require dependable connectivity, simplified management, and optimized traffic handling across multiple network layers.

General Product Specifications

• Manufacturer: Cisco  
• Part Number: SF550X-48P-K9-NA
• Series: Cisco 550X Series
• Model: SF550X-48P
• Product Type: Layer 3 Managed Ethernet Switch
• Product Name: SF550X-48P Layer 3 Switch

Port 

• 48 Fast Ethernet PoE+ network ports for endpoint connectivity
• 2 integrated 10 Gigabit Ethernet network ports
• 4 dedicated 10 Gigabit Ethernet uplink ports for backbone connectivity
• 50 total network ports combining access and uplink interfaces

Expansion Flexibility

• 4 x 10 Gigabit Ethernet uplinks
• Optimized for aggregation and distribution layers
• Supports scalable network expansion

Stacking and Modular Capabilities

• Stacking ports for simplified scalability
• Modular design for adaptable network deployments
• Improved fault tolerance and operational continuity

Supported Media Types

• Twisted Pair cabling for standard Ethernet connections
• Optical Fiber interfaces for long-distance and high-speed links

Ethernet and Network Technologies

• Fast Ethernet for stable and cost-effective access connections
• 10 Gigabit Ethernet for high-throughput data transmission
• 10GBase-T for copper-based high-speed networking
• 10/100Base-T for backward compatibility
• 10GBase-X for fiber-based optical networking

Expansion Slot Configuration

• 4 total SFP+ expansion slots
• Shared SFP+ slots for efficient resource utilization
• Support for additional fiber or copper transceivers

Layer Support and Routing Intelligence

• Layer 3 routing for inter-VLAN communication
• Improved traffic optimization and reduced latency
• Enhanced support for complex network architectures

Management Interfaces

• User-friendly web-based management interface
• Command-line access via Telnet
• Centralized monitoring and configuration support

Supported Management and Network Protocols

• SNMP versions v1, v2c, and v3
• RMON groups 1, 2, 3, and 9
• VLAN for logical network segmentation
• Quality of Service for traffic prioritization
• Syslog for event logging and diagnostics
• DHCP support for dynamic IP addressing
• MIB integration for advanced monitoring

Power and Redundancy Features

• Standard internal power supply
• Support for redundant power supply options
• Improved uptime and fault tolerance

Cisco SF550X-48P-K9-NA Small Business Managed Switch

The Cisco SF550X-48P-K9-NA belongs to the Cisco 550X Series, a portfolio of advanced small business switches engineered to deliver enterprise-grade Layer 3 functionality, extensive Power over Ethernet Plus capabilities, and scalable high-speed uplink performance. This category focuses on fully managed Ethernet switches designed for organizations that require dependable network segmentation, traffic prioritization, secure access control, and simplified administration without the operational complexity typically associated with large enterprise infrastructures. The 48-port PoE+ configuration positions this model as a core or aggregation layer solution within growing networks, branch offices, and distributed environments.

Positioning Within Cisco Small Business Switching Portfolio

The Cisco SF550X-48P-K9-NA is strategically positioned above entry-level smart switches and below enterprise campus switching platforms, offering a balanced combination of advanced routing intelligence, energy-efficient power delivery, and flexible connectivity. Within the small business switching category, this device addresses the needs of organizations transitioning from unmanaged or Layer 2 switches to a fully routed environment that supports multiple VLANs, inter-VLAN routing, and resilient network architectures. The switch category emphasizes stability, predictable performance, and ease of deployment while maintaining compatibility with industry standards.

48-Port PoE+ Ethernet Architecture

This category emphasizes high-density Ethernet access, and the Cisco SF550X-48P-K9-NA exemplifies this with forty-eight Fast Ethernet ports capable of delivering PoE+ power. The PoE+ design supports power-hungry devices such as IP cameras, wireless access points, VoIP phones, and access control systems, enabling network expansion without additional electrical infrastructure. The category highlights centralized power management, ensuring consistent energy delivery while maintaining optimal thermal efficiency and device longevity.

Power Distribution and Network Convergence

In the context of converged networks, the PoE+ capability plays a central role by unifying data and power transmission through a single Ethernet cable. This category supports modern office environments where voice, video, and data traffic coexist on the same infrastructure. The Cisco SF550X-48P-K9-NA enhances this convergence by maintaining power reliability across all connected endpoints, even under high utilization scenarios.

Layer 3 Managed Switching Capabilities

The defining characteristic of this category is full Layer 3 management, enabling advanced routing features that extend beyond traditional switching. The Cisco SF550X-48P-K9-NA supports static routing and dynamic routing protocols, allowing network administrators to create scalable, segmented architectures that improve performance and security. This functionality makes the category suitable for multi-department networks, distributed branches, and environments requiring controlled inter-VLAN communication.

Inter-VLAN Routing and Network Segmentation

Layer 3 capabilities within this category allow seamless communication between VLANs without the need for external routers. The Cisco SF550X-48P-K9-NA provides efficient packet forwarding, reducing latency and improving throughput across segmented networks. This design supports business growth by enabling logical separation of departments, services, or applications while maintaining centralized control.

High-Performance Switching Fabric

Performance is a critical attribute of this category, and the Cisco SF550X-48P-K9-NA delivers reliable throughput through a robust switching fabric. The architecture is optimized to handle simultaneous data streams from multiple connected devices without congestion. This performance consistency ensures that latency-sensitive applications such as voice and video operate smoothly alongside traditional data traffic.

Traffic Prioritization and Quality of Service

Quality of Service features are integral to this category, enabling prioritization of mission-critical traffic. The Cisco SF550X-48P-K9-NA supports advanced traffic classification and queuing mechanisms that ensure real-time applications receive appropriate bandwidth allocation. This approach minimizes packet loss and jitter, enhancing overall user experience across the network.

10 Gigabit SFP+ Uplink Expansion

Scalability is a core focus of the Cisco SF550X-48P-K9-NA category, supported by integrated 10 Gigabit SFP+ uplink ports. These high-speed uplinks provide the bandwidth required to connect to aggregation switches, data centers, or high-performance servers. The category supports future growth by allowing network administrators to expand capacity without replacing existing access infrastructure.

Aggregation and Core Connectivity

The inclusion of 10 Gigabit uplinks enables this category to function effectively within multi-tier network designs. The Cisco SF550X-48P-K9-NA can serve as an access or distribution switch, maintaining high-speed connectivity to upstream devices. This flexibility supports scalable network topologies that adapt to increasing traffic demands.

Advanced Security Framework

Security is a fundamental component of this category, addressing the need to protect sensitive data and prevent unauthorized access. The Cisco SF550X-48P-K9-NA integrates multiple security mechanisms designed to safeguard network integrity while maintaining operational efficiency.

Access Control and Authentication

Authentication and authorization features ensure that only approved devices and users can access network resources. This category supports secure access methods that reduce the risk of internal and external threats. The Cisco SF550X-48P-K9-NA enhances visibility and control by allowing administrators to define granular access policies across the network.

Network Threat Mitigation

Built-in protections against common network threats help maintain availability and performance. The category incorporates safeguards such as storm control, secure management interfaces, and monitoring capabilities that detect abnormal traffic patterns. These features collectively strengthen the resilience of the network infrastructure.

Comprehensive Management

Ease of management is a defining attribute of this category, offering intuitive tools for configuration, monitoring, and troubleshooting. The Cisco SF550X-48P-K9-NA supports both graphical and command-line management interfaces, catering to administrators with varying levels of technical expertise.

Web-Based Configuration Interface

The integrated web-based interface simplifies deployment and ongoing management. This category enables rapid configuration of VLANs, routing policies, and security settings without extensive training. Visual dashboards provide real-time insights into network performance and device status.

Command-Line Interface and Automation

For advanced users, command-line access offers granular control and automation capabilities. The Cisco SF550X-48P-K9-NA category supports scripting and configuration consistency across multiple devices, enhancing operational efficiency in larger deployments.

Reliability and High Availability Design

Network reliability is central to this category, ensuring continuous operation in business-critical environments. The Cisco SF550X-48P-K9-NA incorporates features that enhance uptime and reduce the risk of service interruptions.

Redundant Power and Fault Tolerance

Design elements within this category focus on minimizing downtime through resilient hardware architecture. Stable power delivery, efficient cooling, and robust components contribute to long-term reliability and predictable performance.

Energy Efficiency and Sustainable Networking

The Cisco SF550X-48P-K9-NA category aligns with modern sustainability goals by incorporating energy-efficient technologies. Intelligent power management reduces consumption during periods of low activity, lowering operational costs while maintaining network readiness.

Adaptive Power Management

Energy optimization features dynamically adjust power usage based on device activity. This category supports environmentally responsible networking practices without compromising performance or availability.

Deployment Scenarios and Use Case Flexibility

This category is well-suited for a wide range of deployment scenarios, including small and medium-sized enterprises, educational institutions, healthcare facilities, and retail environments. The Cisco SF550X-48P-K9-NA adapts to diverse operational requirements by providing scalable performance, centralized power delivery, and advanced management capabilities.

Enterprise Edge and Branch Networks

At the enterprise edge, this category delivers secure connectivity and efficient traffic management. Branch offices benefit from simplified routing, integrated PoE+, and centralized control, enabling consistent network policies across distributed locations.

Compatibility and Interoperability

Interoperability with existing network components is a key focus of this category. The Cisco SF550X-48P-K9-NA adheres to industry standards, ensuring seamless integration with third-party devices, legacy equipment, and future network expansions.

Standards-Based Networking

Support for standardized protocols ensures predictable behavior and long-term compatibility. This category enables organizations to build flexible networks without vendor lock-in, preserving investment value.

Operational Efficiency and Cost Optimization

By consolidating routing, switching, and power delivery into a single platform, this category reduces infrastructure complexity and operational overhead. The Cisco SF550X-48P-K9-NA supports efficient network management practices that enhance productivity and lower total cost of ownership.