CISCO WS-X4920-GB-RJ45 20-port Gigabit Ethernet line card

Product Overview
The Cisco WS-X4920-GB-RJ45 is a 20-port Gigabit Ethernet line card designed for the Cisco Catalyst 4900 Series. It provides fixed RJ45 copper interfaces for high-density access and distribution layers. Because the module integrates directly with Catalyst 4948 and 4900M switches, it offers reliable performance for enterprise and data-centre networks. In addition, its non-blocking architecture helps maintain consistent throughput under load. As a result, the line card is suitable for environments that require stable Gigabit access with low latency.

Key Features

• 20 Gigabit Ethernet RJ45 ports

• Compatible with Cisco Catalyst 4900 Series

• Non-blocking switching design

• Supports full-duplex Gigabit speeds

• Hot-swappable for fast service operations

• Designed for enterprise and data-centre networks

• Supports network security and QoS features

• Simple copper cabling with RJ45 connectors

• Stable performance for high-density deployments

Technical Specification Highlights

• Module type: WS-X4920-GB-RJ45

• Port count: 20 × 10/100/1000 RJ45

• Platform support: Catalyst 4900M, 4948, 4948E (model-dependent)

• Switching type: non-blocking Gigabit architecture

• Duplex modes: auto-negotiated full-duplex

• Cable support: Category 5e or higher

• Hot-swap capability: yes

• Designed for high-availability network operations

• Supports VLAN segmentation, QoS and Layer 2 security features

Usage & Application
This line card is used in enterprise switching layers, data-centre racks and high-density access networks. Because it offers 20 copper Gigabit ports, it is ideal for server connectivity, aggregation cabinets and wiring-closets. It also supports locations where simple copper cabling is preferred over fibre. Furthermore, its hot-swap design allows replacement without service interruption. As a result, the module works well in environments where uptime, flexibility and predictable performance are important.

Why Choose this Product
Choose the Cisco WS-X4920-GB-RJ45 if you need a reliable Gigabit line card for Catalyst 4900 Series switches. It provides stable 20-port RJ45 connectivity, supports enterprise-class features and fits seamlessly into existing Cisco deployments. Because it combines simplicity with high availability, it remains a practical choice for long-term network expansion.

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The CISCO Catalyst 4900 installation guide is shown here