WS-C3750-48TS-S Cisco Catalyst 3750 Switch 48 10/100 + 4 SFP

Cisco WS-C3750-48TS-S Catalyst 3750 Switch Overview

The Cisco WS-C3750-48TS-S is a high-performance managed switch designed for medium to large-scale networks. Featuring 48 10/100 Mbps ports and 4 SFP uplinks, this switch delivers reliability, scalability, and advanced network management capabilities.

Key Features of Cisco WS-C3750-48TS-S

• Manufacturer: Cisco
• Model: WS-C3750-48TS-S
• Type: Managed Layer 2 Network Switch
• Port Configuration: 48 x 10/100 Mbps RJ-45 ports + 4 SFP slots
• Expandable with GBIC modules for uplink flexibility

Technical Specifications

Interfaces & Connectivity

• Console Port: Serial RJ-45 for local management
• Data Ports: 48 Fast Ethernet (10/100 Mbps) ports
• Optional Expansion: 4 SFP slots for fiber connectivity

Performance Metrics

• MAC Address Table: Supports up to 12,000 entries
• Traffic Prioritization: IEEE 802.1p Layer 2 QoS for optimized network performance

Standards & Protocols Support

• LAN Standards:
  • IEEE 802.1d Spanning Tree
  • IEEE 802.1w Rapid Spanning Tree (RSTP)
  • IEEE 802.1q VLAN tagging
  • IEEE 802.3 Ethernet and Fast Ethernet
  • IEEE 802.3ab Gigabit Ethernet
  • IEEE 802.3ad Link Aggregation
  • IEEE 802.1x Port Access Control
• Management Protocols: SNMP, RMON, Telnet
• Networking Protocols: IGMP, RADIUS, SNTP, SSH, DHCP
• Routing Support: RIP v1, RIP v2, Static Routing

Additional Functional Features

• LED Indicators: Link/Status, Activity, Duplex, Power
• Rack Mounting: Standard kit included, optional upgrades available
• Optional Expansion: 4 GBIC ports for additional network flexibility

Dimensions & Physical Specifications

• Width: 17.53 inches
• Depth: 11.86 inches
• Height: 1.73 inches
• Weight: 9.04 lbs

Cisco Catalyst 3750 Series Managed Switching Architecture

The Cisco WS-C3750-48TS-S Catalyst 3750 Switch represents a mature and highly reliable segment of enterprise-class managed switching technology, designed to deliver consistent Layer 2 and basic Layer 3 capabilities within access and distribution network layers. As part of the Cisco Catalyst 3750 Series, this model embodies Cisco’s long-standing approach to scalable switching, emphasizing resiliency, centralized management, and predictable performance. The architecture of the Catalyst 3750 family is built to address the needs of mid-sized to large enterprise networks that require dependable connectivity, simplified configuration, and robust traffic handling without unnecessary complexity.

The WS-C3750-48TS-S model is engineered around a fixed-configuration chassis that integrates forty-eight 10/100 Fast Ethernet ports alongside four Small Form-Factor Pluggable uplink interfaces. This layout allows organizations to connect a dense set of endpoint devices while maintaining flexible uplink options for fiber-based aggregation or backbone connectivity. The internal switching fabric is optimized to support simultaneous data transfers across all ports, ensuring that network traffic flows smoothly even during peak utilization periods. Cisco’s proprietary switching logic within the Catalyst 3750 Series enables intelligent packet forwarding, efficient MAC address learning, and stable performance under sustained workloads.

At the core of the Catalyst 3750 design is Cisco IOS Software, which provides a unified and familiar operating environment across a wide range of Cisco networking devices. This consistency allows network administrators to apply established configuration standards, security policies, and management practices without retraining or reengineering existing workflows. The WS-C3750-48TS-S variant operates with the Standard Multilayer Image, offering advanced Layer 2 switching features and limited Layer 3 routing functions suitable for many enterprise edge and access-layer deployments.

48-Port Fast Ethernet Access Connectivity

The forty-eight 10/100 Ethernet ports of the Cisco WS-C3750-48TS-S are designed to support a broad array of wired network devices, including desktop computers, IP phones, printers, networked appliances, and embedded systems. These ports deliver reliable Fast Ethernet connectivity that remains relevant in environments where bandwidth requirements are moderate but stability and uptime are critical. By supporting auto-negotiation and standard Ethernet protocols, the switch ensures seamless integration with existing network infrastructure and legacy devices.

Each access port is capable of handling full-duplex communication, minimizing collisions and maximizing effective throughput. The switch’s internal buffering and queue management mechanisms are optimized to manage traffic bursts and prevent packet loss during periods of congestion. This capability is particularly valuable in office environments, educational institutions, and industrial networks where multiple devices may simultaneously generate traffic.

The density of forty-eight access ports in a single chassis allows organizations to consolidate network infrastructure, reducing the number of switches required per wiring closet. This consolidation simplifies cabling, lowers power consumption per connected device, and streamlines maintenance operations. The WS-C3750-48TS-S is frequently deployed in access-layer scenarios where predictable performance and straightforward management are essential.

Integrated SFP Uplink Interfaces for Flexible Expansion

The inclusion of four SFP uplink ports significantly enhances the versatility of the Cisco WS-C3750-48TS-S. These uplinks support a variety of Cisco-compatible SFP transceivers, enabling connections over multimode or single-mode fiber as well as copper-based options where appropriate. This flexibility allows the switch to serve as a reliable aggregation point, connecting access-layer devices to distribution switches, core routers, or data center infrastructure.

Fiber-based uplinks are particularly beneficial in environments requiring longer cable runs, electrical isolation, or increased resistance to electromagnetic interference. The SFP interfaces enable network designers to tailor uplink capacity and distance according to specific deployment requirements without replacing the switch itself. This modularity extends the operational lifespan of the Catalyst 3750 platform and protects long-term infrastructure investments.

The uplink ports are tightly integrated into the switch’s forwarding architecture, ensuring low-latency transmission and consistent performance. Traffic flowing between access ports and uplinks benefits from intelligent queuing and prioritization mechanisms that help maintain service quality for critical applications.

Layer 2 Switching Features and Network Control

The Cisco WS-C3750-48TS-S is built upon a comprehensive set of Layer 2 switching features that provide granular control over network traffic. These capabilities allow administrators to segment networks logically, manage broadcast domains, and enforce traffic policies that enhance security and performance. Virtual LAN support is central to the switch’s design, enabling multiple isolated networks to coexist on a single physical infrastructure.

Support for IEEE 802.1Q VLAN tagging allows the switch to participate in complex, multi-switch VLAN architectures. Trunking capabilities ensure that VLAN information is preserved across uplinks, facilitating seamless communication between switches while maintaining logical separation of traffic. This functionality is essential in enterprise environments where departments, applications, or security zones must remain isolated.

Spanning Tree Protocol and its Cisco-enhanced variants play a critical role in maintaining network stability. The Catalyst 3750 Series supports rapid convergence mechanisms that minimize downtime in the event of link failures or topology changes. By preventing switching loops and dynamically recalculating active paths, the WS-C3750-48TS-S helps ensure continuous network availability.

Advanced VLAN and Trunking Capabilities

VLAN configuration on the Cisco WS-C3750-48TS-S allows administrators to design flexible network topologies that align with organizational structures and security requirements. VLANs can be assigned to individual ports or groups of ports, enabling precise control over traffic flows. This capability reduces unnecessary broadcast traffic and enhances overall network efficiency.

Trunk links configured on the SFP uplinks or selected Fast Ethernet ports carry multiple VLANs simultaneously, simplifying inter-switch connectivity. The switch supports dynamic trunking protocols that automate trunk negotiation, reducing configuration errors and deployment time. These features are particularly valuable in environments with frequent network changes or expansions.

The switch’s ability to manage VLAN databases locally or synchronize them across multiple devices ensures consistency and reduces administrative overhead. Network teams can implement standardized VLAN schemas across entire campuses or branch networks using familiar Cisco IOS commands.

Loop Prevention and Network Stability

Network loops pose a significant risk to Ethernet networks, potentially leading to broadcast storms and widespread outages. The Cisco WS-C3750-48TS-S incorporates robust loop prevention mechanisms through its support for Spanning Tree Protocol, Rapid Spanning Tree Protocol, and Cisco proprietary enhancements. These protocols monitor network topology in real time and dynamically adjust port states to maintain a loop-free environment.

Rapid convergence capabilities reduce the time required to restore connectivity after a topology change, minimizing disruption to end users and applications. The switch’s intelligent handling of link failures and recoveries ensures that alternative paths are activated quickly and efficiently.

These stability-focused features make the Catalyst 3750 Series a trusted choice for networks where uptime is critical and unplanned outages are unacceptable.

Limited Layer 3 Functionality and Multilayer Support

While the Cisco WS-C3750-48TS-S is primarily positioned as a Layer 2 switch, it includes limited Layer 3 functionality that enhances its versatility in enterprise networks. The Standard Multilayer Image enables basic IP routing features that allow the switch to perform inter-VLAN routing without the need for an external router in certain scenarios.

This capability is particularly useful in smaller networks or branch offices where simplicity and cost efficiency are priorities. By handling inter-VLAN traffic locally, the switch reduces latency and minimizes the load on upstream routing devices. The integration of routing and switching functions within a single platform simplifies network design and management.

The multilayer capabilities of the Catalyst 3750 Series are implemented through hardware-assisted forwarding, ensuring that routing decisions do not compromise overall performance. Even with multiple VLANs and active routes, the switch maintains consistent throughput across all ports.

Inter-VLAN Routing Efficiency

Inter-VLAN routing on the WS-C3750-48TS-S allows devices in different VLANs to communicate while maintaining logical separation at the switching level. This function is essential for enabling shared services, centralized resources, and controlled access between network segments.

The switch supports static routing and basic dynamic routing interactions that meet the needs of many enterprise access-layer deployments. By processing routing decisions internally, the switch eliminates the need for external router hops in certain designs, resulting in faster communication and simplified troubleshooting.

This balance between Layer 2 switching and limited Layer 3 routing makes the Catalyst 3750 a flexible solution for organizations seeking to optimize network efficiency without introducing unnecessary complexity.

Security Features and Traffic Protection

Security is a fundamental consideration in enterprise networking, and the Cisco WS-C3750-48TS-S includes a range of features designed to protect network resources and control access. Port-level security mechanisms allow administrators to restrict which devices can connect to specific ports, reducing the risk of unauthorized access.

Support for access control lists enables granular filtering of traffic based on source, destination, and protocol criteria. These controls help enforce organizational security policies and limit exposure to potential threats. By implementing security measures directly on the switch, organizations can create multiple layers of defense within their network architecture.

The Catalyst 3750 Series also supports secure management protocols, ensuring that administrative access to the switch is protected from interception or tampering. These features contribute to a comprehensive security posture that aligns with enterprise best practices.

Port Security and Access Control

Port security on the WS-C3750-48TS-S allows network administrators to define the number and identity of devices permitted on each port. This capability is particularly valuable in environments where physical access to network ports cannot be fully controlled. By limiting MAC address associations, the switch helps prevent unauthorized devices from gaining network access.

Access control lists provide additional layers of traffic filtering, enabling precise control over which devices and applications can communicate. These features support compliance requirements and help protect sensitive data from unauthorized exposure.

Scalability and Long-Term Reliability

The Cisco Catalyst 3750 Series has earned a reputation for long-term reliability and consistent performance. The WS-C3750-48TS-S benefits from this legacy, offering stable operation over extended deployment periods. Its robust hardware design and mature software platform make it suitable for mission-critical applications where predictable behavior is essential.

Scalability is achieved through thoughtful port density, flexible uplinks, and support for advanced network features. Organizations can deploy the switch as part of a larger Catalyst ecosystem, integrating it seamlessly with other Cisco devices to create cohesive, scalable network architectures.

This combination of reliability, manageability, and performance continues to make the Cisco WS-C3750-48TS-S a relevant and trusted option within enterprise access-layer and distribution-layer networking categories.