Cisco WS-X4920-GB-RJ45 Expansion Module
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WS-X4920-GB-RJ45 Cisco 20 Ports 1GBPS Expansion Module Refurbished

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Part Number#: WS-X4920-GB-RJ45
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Short Description:
WS-X4920-GB-RJ45 Catalyst 20 Ports 1 Gigabytes Per Second (GBPS) Gigabit Ethernet Twisted Pair 10/100/100base-T Data Networking Half Card Expansion Module | Made by Cisco | Refurbished
Product Condition:
Warranty provided by ALLHDD.COM:
90 Days

Product Overview for the Cisco WS-X4920-GB-RJ45 20 Ports Expansion Module

The WS-X4920-GB-RJ45 Cisco Catalyst 20 Ports Expansion Module is a critical networking component designed to enhance the capabilities of Cisco Catalyst switches. In this detailed guide, we will delve into the key features, specifications, and applications of this expansion module. Whether you are a network administrator, IT professional, or someone looking to understand networking equipment, this comprehensive overview will provide valuable insights.

Key Features

  • Port Density and Configuration: The WS-X4920-GB-RJ45 boasts a remarkable 20 ports, offering significant expansion capabilities for Cisco Catalyst switches. These ports are configured to support Gigabit Ethernet connectivity, ensuring high-speed data transfer within the network.
  • RJ45 Interface: The RJ45 interface is a standard Ethernet connection that utilizes an 8-pin modular connector. This widely adopted interface ensures compatibility with various networking devices, making the WS-X4920-GB-RJ45 versatile and easy to integrate into existing setups.
  • Scalability: As organizations grow, so does the need for scalable network solutions. The WS-X4920-GB-RJ45 addresses this requirement by providing a scalable platform that allows for seamless expansion of network infrastructure. This scalability is crucial for adapting to evolving business demands and increasing data loads.
  • High-Speed Data Transfer: With support for Gigabit Ethernet, this expansion module facilitates high-speed data transfer, reducing latency and enhancing overall network performance. This is particularly beneficial for bandwidth-intensive applications and data-intensive tasks.
  • Compatibility with Cisco Catalyst Switches: The WS-X4920-GB-RJ45 is specifically designed for integration with Cisco Catalyst switches, ensuring optimal performance and compatibility. This compatibility simplifies the deployment process, making it an ideal choice for Cisco-centric network environments.

Technical Specifications

  • Form Factor: The expansion module adopts a compact form factor, optimizing space utilization within network cabinets. Its design is tailored to seamlessly fit into compatible Cisco Catalyst switches, providing a neat and organized networking infrastructure.
  • Power Over Ethernet (PoE) Support: Some models of the WS-X4920-GB-RJ45 may offer Power Over Ethernet (PoE) support. This feature allows the expansion module to deliver power to connected devices, such as IP cameras or VoIP phones, eliminating the need for separate power sources.
  • Layer 2 and Layer 3 Functionality: The WS-X4920-GB-RJ45 is equipped with both Layer 2 and Layer 3 functionality, providing advanced networking capabilities. This dual-layer support enables the module to handle not only data link functions but also network layer routing, enhancing its versatility in different network architectures.
  • Hot-Swappable Design: The hot-swappable design of the WS-X4920-GB-RJ45 allows for easy replacement or addition of modules without disrupting the operation of the entire network. This feature minimizes downtime during maintenance activities, contributing to enhanced network reliability.


  • Enterprise Networks: In large enterprise networks, the WS-X4920-GB-RJ45 plays a crucial role in expanding connectivity and accommodating the growing number of devices. Its high port density and scalability make it an ideal choice for organizations with extensive networking needs.
  • Data Centers: Data centers require robust and scalable networking solutions to handle the immense volume of data traffic. The WS-X4920-GB-RJ45, with its Gigabit Ethernet support and scalability, is well-suited for data center environments where performance and reliability are paramount.
  • Education Institutions: Educational institutions, with their diverse networking requirements, can benefit from the WS-X4920-GB-RJ45. Its compatibility with Cisco Catalyst switches makes it a reliable choice for building resilient and high-performance networks in schools and universities.
  • Government Organizations: Government networks demand secure and efficient solutions to support various applications and services. The WS-X4920-GB-RJ45, with its Layer 2 and Layer 3 functionality, meets the stringent requirements of government organizations for secure and reliable networking.

Deployment Best Practices

  • Assessment of Network Requirements: Before deploying the WS-X4920-GB-RJ45, a thorough assessment of network requirements is essential. This includes understanding the current network infrastructure, anticipated growth, and specific application needs.
  • Firmware and Software Compatibility: Ensuring that the firmware and software of the existing Cisco Catalyst switches are compatible with the WS-X4920-GB-RJ45 is crucial. This step helps prevent compatibility issues and ensures smooth integration into the network.
  • Configuration and Optimization: Proper configuration of the expansion module is vital for optimal performance. Network administrators should carefully configure the WS-X4920-GB-RJ45 based on the specific needs of their network, taking advantage of its Layer 2 and Layer 3 capabilities.
  • Regular Maintenance and Monitoring: Implementing a regular maintenance schedule and continuous monitoring are essential for the long-term reliability of the network. Regular checks on the status of the WS-X4920-GB-RJ45 and other network components help identify potential issues before they escalate.

Performance and Reliability

The model Cisco Catalyst 4900M 20-ports half-card expansion module is designed to provide high performance and reliability for the Cisco Catalyst 4900M switch.

The module provides an additional 20 Gigabit Ethernet ports for the switch, allowing for more devices to be connected to the network. The ports on the module use RJ-45 connectors and support both 10/100/1000Mbps speeds. This allows for fast and efficient data transfer between devices connected to the network.

The module is also designed for high reliability. It is hot-swappable, which means that it can be removed and replaced without having to power off the switch. This allows for minimal downtime and easy maintenance. Additionally, the module supports a variety of advanced features such as quality of service (QoS) and security features to help ensure that network traffic is properly prioritized and that the network is protected from potential threats.

The Cisco Catalyst 4900M switch is known for its high performance and reliability. The WS-X4920-GB-RJ45 expansion module is fully compatible with the switch, and it's been tested and certified by Cisco to meet the necessary standards. This ensures that the module will continue to function properly, even under difficult conditions.

Interface Provided for Digital Workplace

The WS-X4920-GB-RJ45 Cisco Catalyst 4900M 20-ports half card expansion module provides a Gigabit Ethernet interface for the digital workplace. This means that it provides a high-speed, reliable connection for devices in the digital workplace such as computers, servers, and other networking equipment.

The module has 20 ports, each of which uses RJ-45 connectors and supports both 10/100/1000Mbps speeds. This allows for fast and reliable data transfer between devices connected to the network, ensuring that employees in the digital workplace have access to the resources they need to be productive.

The module also supports advanced features such as quality of service (QoS) and security features. QoS allows for the prioritization of network traffic, which can be particularly useful in a digital workplace where different types of traffic (such as voice, video, and data) may need to be handled differently. Security features can help to protect the network from potential threats, ensuring that sensitive data remains protected.

The module is hot-swappable, which means that it can be removed and replaced without having to power off the switch, minimizing downtime, and it's easy to maintain.

General Information about this Cisco WS-X4920-GB-RJ45

  • Manufacturer: Cisco
  • Part Number or SKU# WS-X4920-GB-RJ45
  • Product Type: Expansion Module

Technical Information of 20 Ports Module

  • Application/Usage: Data Networking
  • Form Factor: Plug-in module
  • Total Number of Ports: 20
  • Connector Type: RJ-45
  • Interfaces/Ports Details: 20 x RJ-45 10/100/1000Base-T LAN

Media & Performance

  • Media Type Supported: Twisted Pair
  • Data Transfer Rate: 1 GBPS


  • Connectivity Technology: Wired
  • Cabling Type: Ethernet 10Base-T, Ethernet 100Base-TX, Ethernet 1000Base-T
  • Data Link Protocol: Ethernet, Fast Ethernet, Gigabit Ethernet
  • Data Transfer Rate: 1 GBPS
  • Status Indicators: Port status, status


  • Full duplex capability, half duplex mode

Expansion / Connectivity

  • Interfaces: 20 x 1000Base-T - RJ-45
  • Compatible Slots: 1 x expansion slot
  • Compatibility: Cisco Catalyst 4900 Series Switches

In short, the WS-X4920-GB-RJ45 Cisco Catalyst 20 Ports Expansion Module is a powerful networking component that addresses the demands of modern network infrastructures. With its high port density, Gigabit Ethernet support, and scalability, this expansion module is well-suited for a variety of applications across different industries. By understanding its key features, technical specifications, and deployment best practices, network administrators can make informed decisions to enhance the performance and efficiency of their networks. Whether deployed in enterprise environments, data centers, educational institutions, or government organizations, the WS-X4920-GB-RJ45 proves to be a valuable asset in building robust and future-ready networks.

Product Condition:
Warranty provided by ALLHDD.COM:
90 Days

About Refurbished Products

Refurbished products are typically refurbished by an Original Manufacturer or an affiliate of the manufacturer or 3rd party facility. This product may have minor blemishes due to normal product usage and doesn't necessarily come with documentation and software unless indicated, but has been well tested and generally has never had any defects.

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